mesa xserver pixman git update 25 nov 2011

1 files changed, 2130 insertions, 2130 deletions

diff --git a/xorg-server/hw/xfree86/common/xf86Mode.c b/xorg-server/hw/xfree86/common/xf86Mode.c
index df0884794..d202d4079 100644
--- a/xorg-server/hw/xfree86/common/xf86Mode.c
+++ b/xorg-server/hw/xfree86/common/xf86Mode.c
@@ -1,2130 +1,2130 @@
-/*

- * Copyright (c) 1997-2003 by The XFree86 Project, Inc.

- *

- * Permission is hereby granted, free of charge, to any person obtaining a

- * copy of this software and associated documentation files (the "Software"),

- * to deal in the Software without restriction, including without limitation

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * and/or sell copies of the Software, and to permit persons to whom the

- * Software is furnished to do so, subject to the following conditions:

- *

- * The above copyright notice and this permission notice shall be included in

- * all copies or substantial portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

- * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR

- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

- * OTHER DEALINGS IN THE SOFTWARE.

- *

- * Except as contained in this notice, the name of the copyright holder(s)

- * and author(s) shall not be used in advertising or otherwise to promote

- * the sale, use or other dealings in this Software without prior written

- * authorization from the copyright holder(s) and author(s).

- */

-

-/*

- * LCM() and scanLineWidth() are:

- *

- * Copyright 1997 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org

- *

- * Permission to use, copy, modify, distribute, and sell this software and its

- * documentation for any purpose is hereby granted without fee, provided that

- * the above copyright notice appear in all copies and that both that copyright

- * notice and this permission notice appear in supporting documentation, and

- * that the name of Marc Aurele La France not be used in advertising or

- * publicity pertaining to distribution of the software without specific,

- * written prior permission.  Marc Aurele La France makes no representations

- * about the suitability of this software for any purpose.  It is provided

- * "as-is" without express or implied warranty.

- *

- * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO

- * EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR

- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

- * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

- * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR

- * PERFORMANCE OF THIS SOFTWARE.

- *

- * Copyright 1990,91,92,93 by Thomas Roell, Germany.

- * Copyright 1991,92,93    by SGCS (Snitily Graphics Consulting Services), USA.

- *

- * Permission to use, copy, modify, distribute, and sell this software

- * and its documentation for any purpose is hereby granted without fee,

- * provided that the above copyright notice appear in all copies and

- * that both that copyright notice and this  permission notice appear

- * in supporting documentation, and that the name of Thomas Roell nor

- * SGCS be used in advertising or publicity pertaining to distribution

- * of the software without specific, written prior permission.

- * Thomas Roell nor SGCS makes no representations about the suitability

- * of this software for any purpose. It is provided "as is" without

- * express or implied warranty.

- *

- * THOMAS ROELL AND SGCS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS

- * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

- * FITNESS, IN NO EVENT SHALL THOMAS ROELL OR SGCS BE LIABLE FOR ANY

- * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER

- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF

- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

- */

-

-/*

- * Authors: Dirk Hohndel <hohndel@XFree86.Org>

- *          David Dawes <dawes@XFree86.Org>

- *          Marc La France <tsi@XFree86.Org>

- *          ... and others

- *

- * This file includes helper functions for mode related things.

- */

-

-#ifdef HAVE_XORG_CONFIG_H

-#include <xorg-config.h>

-#endif

-

-#include <X11/X.h>

-#include "xf86Modes.h"

-#include "os.h"

-#include "servermd.h"

-#include "globals.h"

-#include "xf86.h"

-#include "xf86Priv.h"

-#include "edid.h"

-

-static void

-printModeRejectMessage(int index, DisplayModePtr p, int status)

-{

-    char *type;

-

-    if (p->type & M_T_BUILTIN)

-	type = "built-in ";

-    else if (p->type & M_T_DEFAULT)

-	type = "default ";

-    else if (p->type & M_T_DRIVER)

-	type = "driver ";

-    else

-	type = "";

-

-    xf86DrvMsg(index, X_INFO, "Not using %smode \"%s\" (%s)\n", type, p->name,

-	       xf86ModeStatusToString(status));

-}

-

-/*

- * xf86GetNearestClock --

- *	Find closest clock to given frequency (in kHz).  This assumes the

- *	number of clocks is greater than zero.

- */

-int

-xf86GetNearestClock(ScrnInfoPtr scrp, int freq, Bool allowDiv2,

-    int DivFactor, int MulFactor, int *divider)

-{

-    int nearestClock = 0, nearestDiv = 1;

-    int minimumGap = abs(freq - scrp->clock[0]);

-    int i, j, k, gap;

-

-    if (allowDiv2)

-	k = 2;

-    else

-	k = 1;

-

-    /* Must set this here in case the best match is scrp->clock[0] */

-    if (divider != NULL)

-	*divider = 0;

-    

-    for (i = 0;  i < scrp->numClocks;  i++) {

-	for (j = 1; j <= k; j++) {

-	    gap = abs((freq * j) - ((scrp->clock[i] * DivFactor) / MulFactor));

-	    if ((gap < minimumGap) ||

-		((gap == minimumGap) && (j < nearestDiv))) {

-		minimumGap = gap;

-		nearestClock = i;

-		nearestDiv = j;

-		if (divider != NULL)

-		    *divider = (j - 1) * V_CLKDIV2;

-	    }

-	}

-    }

-    return nearestClock;

-}

-

-/*

- * xf86ModeStatusToString

- *

- * Convert a ModeStatus value to a printable message

- */

-

-const char *

-xf86ModeStatusToString(ModeStatus status)

-{

-    switch (status) {

-    case MODE_OK:

-	return "Mode OK";

-    case MODE_HSYNC:

-	return "hsync out of range";

-    case MODE_VSYNC:

-	return "vrefresh out of range";

-    case MODE_H_ILLEGAL:

-	return "illegal horizontal timings";

-    case MODE_V_ILLEGAL:

-	return "illegal vertical timings";

-    case MODE_BAD_WIDTH:

-	return "width requires unsupported line pitch";

-    case MODE_NOMODE:

-	return "no mode of this name";

-    case MODE_NO_INTERLACE:

-	return "interlace mode not supported";

-    case MODE_NO_DBLESCAN:

-	return "doublescan mode not supported";

-    case MODE_NO_VSCAN:

-	return "multiscan mode not supported";

-    case MODE_MEM:

-	return "insufficient memory for mode";

-    case MODE_VIRTUAL_X:

-	return "width too large for virtual size";

-    case MODE_VIRTUAL_Y:

-	return "height too large for virtual size";

-    case MODE_MEM_VIRT:

-	return "insufficient memory given virtual size";

-    case MODE_NOCLOCK:

-	return "no clock available for mode";

-    case MODE_CLOCK_HIGH:

-	return "mode clock too high";

-    case MODE_CLOCK_LOW:

-	return "mode clock too low";

-    case MODE_CLOCK_RANGE:

-	return "bad mode clock/interlace/doublescan";

-    case MODE_BAD_HVALUE:

-	return "horizontal timing out of range";

-    case MODE_BAD_VVALUE:

-	return "vertical timing out of range";

-    case MODE_BAD_VSCAN:

-	return "VScan value out of range";

-    case MODE_HSYNC_NARROW:

-	return "horizontal sync too narrow";

-    case MODE_HSYNC_WIDE:

-	return "horizontal sync too wide";

-    case MODE_HBLANK_NARROW:

-	return "horizontal blanking too narrow";

-    case MODE_HBLANK_WIDE:

-	return "horizontal blanking too wide";

-    case MODE_VSYNC_NARROW:

-	return "vertical sync too narrow";

-    case MODE_VSYNC_WIDE:

-	return "vertical sync too wide";

-    case MODE_VBLANK_NARROW:

-	return "vertical blanking too narrow";

-    case MODE_VBLANK_WIDE:

-	return "vertical blanking too wide";

-    case MODE_PANEL:

-	return "exceeds panel dimensions";

-    case MODE_INTERLACE_WIDTH:

-	return "width too large for interlaced mode";

-    case MODE_ONE_WIDTH:

-        return "all modes must have the same width";

-    case MODE_ONE_HEIGHT:

-        return "all modes must have the same height";

-    case MODE_ONE_SIZE:

-        return "all modes must have the same resolution";

-    case MODE_NO_REDUCED:

-        return "monitor doesn't support reduced blanking";

-    case MODE_BANDWIDTH:

-	return "mode requires too much memory bandwidth";

-    case MODE_BAD:

-	return "unknown reason";

-    case MODE_ERROR:

-	return "internal error";

-    default:

-	return "unknown";

-    }

-}

-

-/*

- * xf86ShowClockRanges() -- Print the clock ranges allowed

- * and the clock values scaled by ClockMulFactor and ClockDivFactor

- */

-void

-xf86ShowClockRanges(ScrnInfoPtr scrp, ClockRangePtr clockRanges)

-{

-    ClockRangePtr cp;

-    int MulFactor = 1;

-    int DivFactor = 1;

-    int i, j;

-    int scaledClock;

-

-    for (cp = clockRanges; cp != NULL; cp = cp->next) {

-	DivFactor = max(1, cp->ClockDivFactor);

-	MulFactor = max(1, cp->ClockMulFactor);

-	if (scrp->progClock) {

-	    if (cp->minClock) {

-		if (cp->maxClock) {

-		    xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			"Clock range: %6.2f to %6.2f MHz\n",

-			(double)cp->minClock / 1000.0,

-			(double)cp->maxClock / 1000.0);

-		} else {

-		    xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			"Minimum clock: %6.2f MHz\n",

-			(double)cp->minClock / 1000.0);

-		}

-	    } else {

-		if (cp->maxClock) {

-		    xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			"Maximum clock: %6.2f MHz\n",

-			(double)cp->maxClock / 1000.0);

-		}

-	    }

-	} else if (DivFactor > 1 || MulFactor > 1) {

-	    j = 0;

-	    for (i = 0; i < scrp->numClocks; i++) {

-		scaledClock = (scrp->clock[i] * DivFactor) / MulFactor;

-		if (scaledClock >= cp->minClock && scaledClock <= cp->maxClock) {

-		    if ((j % 8) == 0) {

-			if (j > 0)

-			    xf86ErrorF("\n");

-			xf86DrvMsg(scrp->scrnIndex, X_INFO, "scaled clocks:");

-		    }

-		    xf86ErrorF(" %6.2f", (double)scaledClock / 1000.0);

-		    j++;

-		}

-	    }

-	    xf86ErrorF("\n");

-	}

-    }

-}

-

-static Bool

-modeInClockRange(ClockRangePtr cp, DisplayModePtr p)

-{

-    return ((p->Clock >= cp->minClock) &&

-	    (p->Clock <= cp->maxClock) &&

-	    (cp->interlaceAllowed || !(p->Flags & V_INTERLACE)) &&

-	    (cp->doubleScanAllowed ||

-	     ((p->VScan <= 1) && !(p->Flags & V_DBLSCAN))));

-}

-

-/*

- * xf86FindClockRangeForMode()    [... like the name says ...]

- */

-static ClockRangePtr

-xf86FindClockRangeForMode(ClockRangePtr clockRanges, DisplayModePtr p)

-{

-    ClockRangePtr cp;

-

-    for (cp = clockRanges; ; cp = cp->next)

-	if (!cp || modeInClockRange(cp, p))

-	    return cp;

-}

-

-

-/*

- * xf86HandleBuiltinMode() - handles built-in modes

- */

-static ModeStatus

-xf86HandleBuiltinMode(ScrnInfoPtr scrp,

-		      DisplayModePtr p,

-		      DisplayModePtr modep,

-		      ClockRangePtr clockRanges,

-		      Bool allowDiv2)

-{

-    ClockRangePtr cp;

-    int extraFlags = 0;

-    int MulFactor = 1;

-    int DivFactor = 1;

-    int clockIndex;

-    

-    /* Reject previously rejected modes */

-    if (p->status != MODE_OK)

-	return p->status;

-

-    /* Reject previously considered modes */

-    if (p->prev)

-        return MODE_NOMODE;

-

-    if ((p->type & M_T_CLOCK_C) == M_T_CLOCK_C) {

-	/* Check clock is in range */

-	cp = xf86FindClockRangeForMode(clockRanges, p);

-	if (cp == NULL){

-	    modep->type = p->type;

-	    p->status = MODE_CLOCK_RANGE;

-	    return MODE_CLOCK_RANGE;

-	}

-	DivFactor = cp->ClockDivFactor;

-	MulFactor = cp->ClockMulFactor;

-	if (!scrp->progClock) {

-	    clockIndex = xf86GetNearestClock(scrp, p->Clock, allowDiv2,

-					     cp->ClockDivFactor,

-					     cp->ClockMulFactor, &extraFlags);

-	    modep->Clock = (scrp->clock[clockIndex] * DivFactor)

-		/ MulFactor;

-	    modep->ClockIndex	= clockIndex;

-	    modep->SynthClock	= scrp->clock[clockIndex];

-	    if (extraFlags & V_CLKDIV2) {

-		modep->Clock /= 2;

-		modep->SynthClock /= 2;

-	    }

-	} else {

-	    modep->Clock = p->Clock;

-	    modep->ClockIndex = -1;

-	    modep->SynthClock = (modep->Clock * MulFactor)

-		/ DivFactor;

-	}

-	modep->PrivFlags = cp->PrivFlags;

-    } else {

-	if(!scrp->progClock) {

-            modep->Clock = p->Clock;

-	    modep->ClockIndex = p->ClockIndex;

-	    modep->SynthClock = p->SynthClock;

-	} else {

-	    modep->Clock = p->Clock;

-	    modep->ClockIndex = -1;

-	    modep->SynthClock = p->SynthClock;

-	}

-	modep->PrivFlags = p->PrivFlags;

-    }

-    modep->type            = p->type;

-    modep->HDisplay        = p->HDisplay;

-    modep->HSyncStart      = p->HSyncStart;

-    modep->HSyncEnd        = p->HSyncEnd;

-    modep->HTotal          = p->HTotal;

-    modep->HSkew           = p->HSkew;

-    modep->VDisplay        = p->VDisplay;

-    modep->VSyncStart      = p->VSyncStart;

-    modep->VSyncEnd        = p->VSyncEnd;

-    modep->VTotal          = p->VTotal;

-    modep->VScan           = p->VScan;

-    modep->Flags           = p->Flags | extraFlags;

-    modep->CrtcHDisplay    = p->CrtcHDisplay;

-    modep->CrtcHBlankStart = p->CrtcHBlankStart;

-    modep->CrtcHSyncStart  = p->CrtcHSyncStart;

-    modep->CrtcHSyncEnd    = p->CrtcHSyncEnd;

-    modep->CrtcHBlankEnd   = p->CrtcHBlankEnd;

-    modep->CrtcHTotal      = p->CrtcHTotal;

-    modep->CrtcHSkew       = p->CrtcHSkew;

-    modep->CrtcVDisplay    = p->CrtcVDisplay;

-    modep->CrtcVBlankStart = p->CrtcVBlankStart;

-    modep->CrtcVSyncStart  = p->CrtcVSyncStart;

-    modep->CrtcVSyncEnd    = p->CrtcVSyncEnd;

-    modep->CrtcVBlankEnd   = p->CrtcVBlankEnd;

-    modep->CrtcVTotal      = p->CrtcVTotal;

-    modep->CrtcHAdjusted   = p->CrtcHAdjusted;

-    modep->CrtcVAdjusted   = p->CrtcVAdjusted;

-    modep->HSync           = p->HSync;

-    modep->VRefresh        = p->VRefresh;

-    modep->Private         = p->Private;

-    modep->PrivSize        = p->PrivSize;

-

-    p->prev = modep;

-    

-    return MODE_OK;

-}

-

-/*

- * xf86LookupMode

- *

- * This function returns a mode from the given list which matches the

- * given name.  When multiple modes with the same name are available,

- * the method of picking the matching mode is determined by the

- * strategy selected.

- *

- * This function takes the following parameters:

- *    scrp         ScrnInfoPtr

- *    modep        pointer to the returned mode, which must have the name

- *                 field filled in.

- *    clockRanges  a list of clock ranges.   This is optional when all the

- *                 modes are built-in modes.

- *    strategy     how to decide which mode to use from multiple modes with

- *                 the same name

- *

- * In addition, the following fields from the ScrnInfoRec are used:

- *    modePool     the list of monitor modes compatible with the driver

- *    clocks       a list of discrete clocks

- *    numClocks    number of discrete clocks

- *    progClock    clock is programmable

- *

- * If a mode was found, its values are filled in to the area pointed to

- * by modep,  If a mode was not found the return value indicates the

- * reason.

- */

-

-ModeStatus

-xf86LookupMode(ScrnInfoPtr scrp, DisplayModePtr modep,

-	       ClockRangePtr clockRanges, LookupModeFlags strategy)

-{

-    DisplayModePtr p, bestMode = NULL;

-    ClockRangePtr cp;

-    int i, k, gap, minimumGap = CLOCK_TOLERANCE + 1;

-    double refresh, bestRefresh = 0.0;

-    Bool found = FALSE;

-    int extraFlags = 0;

-    int clockIndex = -1;

-    int MulFactor = 1;

-    int DivFactor = 1;

-    int ModePrivFlags = 0;

-    ModeStatus status = MODE_NOMODE;

-    Bool allowDiv2 = (strategy & LOOKUP_CLKDIV2) != 0;

-    int n;

-    const int types[] = {

-	M_T_BUILTIN | M_T_PREFERRED,

-	M_T_BUILTIN,

-	M_T_USERDEF | M_T_PREFERRED,

-	M_T_USERDEF,

-	M_T_DRIVER | M_T_PREFERRED,

-	M_T_DRIVER,

-	0

-    };

-    const int ntypes = sizeof(types) / sizeof(int);

-

-    strategy &= ~(LOOKUP_CLKDIV2 | LOOKUP_OPTIONAL_TOLERANCES);

-

-    /* Some sanity checking */

-    if (scrp == NULL || scrp->modePool == NULL ||

-	(!scrp->progClock && scrp->numClocks == 0)) {

-	ErrorF("xf86LookupMode: called with invalid scrnInfoRec\n");

-	return MODE_ERROR;

-    }

-    if (modep == NULL || modep->name == NULL) {

-	ErrorF("xf86LookupMode: called with invalid modep\n");

-	return MODE_ERROR;

-    }

-    for (cp = clockRanges; cp != NULL; cp = cp->next) {

-	/* DivFactor and MulFactor must be > 0 */

-	cp->ClockDivFactor = max(1, cp->ClockDivFactor);

-	cp->ClockMulFactor = max(1, cp->ClockMulFactor);

-    }

-

-    /* Scan the mode pool for matching names */

-    for (n = 0; n < ntypes; n++) {

-	int type = types[n];

-	for (p = scrp->modePool; p != NULL; p = p->next) {

-

-	    /* scan through the modes in the sort order above */

-	    if ((p->type & type) != type)

-		continue;

-

-	    if (strcmp(p->name, modep->name) == 0) {

-

-		/* Skip over previously rejected modes */

-		if (p->status != MODE_OK) {

-		    if (!found)

-			status = p->status;

-		    continue;

-		}

-

-		/* Skip over previously considered modes */

-		if (p->prev)

-		    continue;

-

-		if (p->type & M_T_BUILTIN) {

-		    return xf86HandleBuiltinMode(scrp, p,modep, clockRanges,

-			    allowDiv2);

-		}

-

-		/* Check clock is in range */

-		cp = xf86FindClockRangeForMode(clockRanges, p);

-		if (cp == NULL) {

-		    /*

-		     * XXX Could do more here to provide a more detailed

-		     * reason for not finding a mode.

-		     */

-		    p->status = MODE_CLOCK_RANGE;

-		    if (!found)

-			status = MODE_CLOCK_RANGE;

-		    continue;

-		}

-

-		/*

-		 * If programmable clock and strategy is not

-		 * LOOKUP_BEST_REFRESH, the required mode has been found,

-		 * otherwise record the refresh and continue looking.

-		 */

-		if (scrp->progClock) {

-		    found = TRUE;

-		    if (strategy != LOOKUP_BEST_REFRESH) {

-			bestMode = p;

-			DivFactor = cp->ClockDivFactor;

-			MulFactor = cp->ClockMulFactor;

-			ModePrivFlags = cp->PrivFlags;

-			break;

-		    }

-		    refresh = xf86ModeVRefresh(p);

-		    if (p->Flags & V_INTERLACE)

-			refresh /= INTERLACE_REFRESH_WEIGHT;

-		    if (refresh > bestRefresh) {

-			bestMode = p;

-			DivFactor = cp->ClockDivFactor;

-			MulFactor = cp->ClockMulFactor;

-			ModePrivFlags = cp->PrivFlags;

-			bestRefresh = refresh;

-		    }

-		    continue;

-		}

-

-		/*

-		 * Clock is in range, so if it is not a programmable clock, find

-		 * a matching clock.

-		 */

-

-		i = xf86GetNearestClock(scrp, p->Clock, allowDiv2,

-			cp->ClockDivFactor, cp->ClockMulFactor, &k);

-		/*

-		 * If the clock is too far from the requested clock, this

-		 * mode is no good.

-		 */

-		if (k & V_CLKDIV2)

-		    gap = abs((p->Clock * 2) -

-			    ((scrp->clock[i] * cp->ClockDivFactor) /

-				cp->ClockMulFactor));

-		else

-		    gap = abs(p->Clock -

-			    ((scrp->clock[i] * cp->ClockDivFactor) /

-				cp->ClockMulFactor));

-		if (gap > minimumGap) {

-		    p->status = MODE_NOCLOCK;

-		    if (!found)

-			status = MODE_NOCLOCK;

-		    continue;

-		}

-		found = TRUE;

-

-		if (strategy == LOOKUP_BEST_REFRESH) {

-		    refresh = xf86ModeVRefresh(p);

-		    if (p->Flags & V_INTERLACE)

-			refresh /= INTERLACE_REFRESH_WEIGHT;

-		    if (refresh > bestRefresh) {

-			bestMode = p;

-			DivFactor = cp->ClockDivFactor;

-			MulFactor = cp->ClockMulFactor;

-			ModePrivFlags = cp->PrivFlags;

-			extraFlags = k;

-			clockIndex = i;

-			bestRefresh = refresh;

-		    }

-		    continue;

-		}

-		if (strategy == LOOKUP_CLOSEST_CLOCK) {

-		    if (gap < minimumGap) {

-			bestMode = p;

-			DivFactor = cp->ClockDivFactor;

-			MulFactor = cp->ClockMulFactor;

-			ModePrivFlags = cp->PrivFlags;

-			extraFlags = k;

-			clockIndex = i;

-			minimumGap = gap;

-		    }

-		    continue;

-		}

-		/*

-		 * If strategy is neither LOOKUP_BEST_REFRESH or

-		 * LOOKUP_CLOSEST_CLOCK the required mode has been found.

-		 */

-		bestMode = p;

-		DivFactor = cp->ClockDivFactor;

-		MulFactor = cp->ClockMulFactor;

-		ModePrivFlags = cp->PrivFlags;

-		extraFlags = k;

-		clockIndex = i;

-		break;

-	    }

-	}

-	if (found) break;

-    }

-    if (!found || bestMode == NULL)

-	return status;

-

-    /* Fill in the mode parameters */

-    if (scrp->progClock) {

-        modep->Clock		= bestMode->Clock;

-	modep->ClockIndex	= -1;

-	modep->SynthClock	= (modep->Clock * MulFactor) / DivFactor;

-    } else {

-	modep->Clock		= (scrp->clock[clockIndex] * DivFactor) /

-				    MulFactor;

-	modep->ClockIndex	= clockIndex;

-	modep->SynthClock	= scrp->clock[clockIndex];

-	if (extraFlags & V_CLKDIV2) {

-	    modep->Clock /= 2;

-	    modep->SynthClock /= 2;

-	}

-    }

-    modep->type                 = bestMode->type;

-    modep->PrivFlags		= ModePrivFlags;

-    modep->HDisplay		= bestMode->HDisplay;

-    modep->HSyncStart		= bestMode->HSyncStart;

-    modep->HSyncEnd		= bestMode->HSyncEnd;

-    modep->HTotal		= bestMode->HTotal;

-    modep->HSkew		= bestMode->HSkew;

-    modep->VDisplay		= bestMode->VDisplay;

-    modep->VSyncStart		= bestMode->VSyncStart;

-    modep->VSyncEnd		= bestMode->VSyncEnd;

-    modep->VTotal		= bestMode->VTotal;

-    modep->VScan		= bestMode->VScan;

-    modep->Flags		= bestMode->Flags | extraFlags;

-    modep->CrtcHDisplay		= bestMode->CrtcHDisplay;

-    modep->CrtcHBlankStart	= bestMode->CrtcHBlankStart;

-    modep->CrtcHSyncStart	= bestMode->CrtcHSyncStart;

-    modep->CrtcHSyncEnd		= bestMode->CrtcHSyncEnd;

-    modep->CrtcHBlankEnd	= bestMode->CrtcHBlankEnd;

-    modep->CrtcHTotal		= bestMode->CrtcHTotal;

-    modep->CrtcHSkew		= bestMode->CrtcHSkew;

-    modep->CrtcVDisplay		= bestMode->CrtcVDisplay;

-    modep->CrtcVBlankStart	= bestMode->CrtcVBlankStart;

-    modep->CrtcVSyncStart	= bestMode->CrtcVSyncStart;

-    modep->CrtcVSyncEnd		= bestMode->CrtcVSyncEnd;

-    modep->CrtcVBlankEnd	= bestMode->CrtcVBlankEnd;

-    modep->CrtcVTotal		= bestMode->CrtcVTotal;

-    modep->CrtcHAdjusted	= bestMode->CrtcHAdjusted;

-    modep->CrtcVAdjusted	= bestMode->CrtcVAdjusted;

-    modep->HSync		= bestMode->HSync;

-    modep->VRefresh		= bestMode->VRefresh;

-    modep->Private		= bestMode->Private;

-    modep->PrivSize		= bestMode->PrivSize;

-

-    bestMode->prev = modep;

-

-    return MODE_OK;

-}

-

-/*

- * xf86CheckModeForMonitor

- *

- * This function takes a mode and monitor description, and determines

- * if the mode is valid for the monitor.

- */

-ModeStatus

-xf86CheckModeForMonitor(DisplayModePtr mode, MonPtr monitor)

-{

-    int i;

-

-    /* Sanity checks */

-    if (mode == NULL || monitor == NULL) {

-	ErrorF("xf86CheckModeForMonitor: called with invalid parameters\n");

-	return MODE_ERROR;

-    }

-

-    DebugF("xf86CheckModeForMonitor(%p %s, %p %s)\n",

-	   mode, mode->name, monitor, monitor->id);

-

-    /* Some basic mode validity checks */

-    if (0 >= mode->HDisplay || mode->HDisplay > mode->HSyncStart ||

-	mode->HSyncStart >= mode->HSyncEnd || mode->HSyncEnd >= mode->HTotal)

-	return MODE_H_ILLEGAL;

-

-    if (0 >= mode->VDisplay || mode->VDisplay > mode->VSyncStart ||

-	mode->VSyncStart >= mode->VSyncEnd || mode->VSyncEnd >= mode->VTotal)

-	return MODE_V_ILLEGAL;

-

-    if (monitor->nHsync > 0) {

-	/* Check hsync against the allowed ranges */

-	float hsync = xf86ModeHSync(mode);

-	for (i = 0; i < monitor->nHsync; i++) 

-	    if ((hsync > monitor->hsync[i].lo * (1.0 - SYNC_TOLERANCE)) &&

-		(hsync < monitor->hsync[i].hi * (1.0 + SYNC_TOLERANCE)))

-		break;

-	

-	/* Now see whether we ran out of sync ranges without finding a match */

-	if (i == monitor->nHsync) 

-	    return MODE_HSYNC;

-    }

-

-    if (monitor->nVrefresh > 0) {

-	/* Check vrefresh against the allowed ranges */

-	float vrefrsh = xf86ModeVRefresh(mode);

-	for (i = 0; i < monitor->nVrefresh; i++)

-	    if ((vrefrsh > monitor->vrefresh[i].lo * (1.0 - SYNC_TOLERANCE)) &&

-		(vrefrsh < monitor->vrefresh[i].hi * (1.0 + SYNC_TOLERANCE)))

-		break;

-

-	/* Now see whether we ran out of refresh ranges without finding a match */

-	if (i == monitor->nVrefresh)

-	    return MODE_VSYNC;

-    }

-

-    /* Force interlaced modes to have an odd VTotal */

-    if (mode->Flags & V_INTERLACE)

-	mode->CrtcVTotal = mode->VTotal |= 1;

-

-    /*

-     * This code stops cvt -r modes, and only cvt -r modes, from hitting 15y+

-     * old CRTs which might, when there is a lot of solar flare activity and

-     * when the celestial bodies are unfavourably aligned, implode trying to

-     * sync to it. It's called "Protecting the user from doing anything stupid".

-     * -- libv

-     */

-

-    if (xf86ModeIsReduced(mode)) {

-        if (!monitor->reducedblanking && !(mode->type & M_T_DRIVER))

-            return MODE_NO_REDUCED;

-    }

-

-    if ((monitor->maxPixClock) && (mode->Clock > monitor->maxPixClock))

-	return MODE_CLOCK_HIGH;

-

-    return MODE_OK;

-}

-

-/*

- * xf86CheckModeSize

- *

- * An internal routine to check if a mode fits in video memory.  This tries to

- * avoid overflows that would otherwise occur when video memory size is greater

- * than 256MB.

- */

-static Bool

-xf86CheckModeSize(ScrnInfoPtr scrp, int w, int x, int y)

-{

-    int bpp = scrp->fbFormat.bitsPerPixel,

-	pad = scrp->fbFormat.scanlinePad;

-    int lineWidth, lastWidth;

-

-    if (scrp->depth == 4)

-	pad *= 4;		/* 4 planes */

-

-    /* Sanity check */

-    if ((w < 0) || (x < 0) || (y <= 0))

-	return FALSE;

-

-    lineWidth = (((w * bpp) + pad - 1) / pad) * pad;

-    lastWidth = x * bpp;

-

-    /*

-     * At this point, we need to compare

-     *

-     *	(lineWidth * (y - 1)) + lastWidth

-     *

-     * against

-     *

-     *	scrp->videoRam * (1024 * 8)

-     *

-     * These are bit quantities.  To avoid overflows, do the comparison in

-     * terms of BITMAP_SCANLINE_PAD units.  This assumes BITMAP_SCANLINE_PAD

-     * is a power of 2.  We currently use 32, which limits us to a video

-     * memory size of 8GB.

-     */

-

-    lineWidth = (lineWidth + (BITMAP_SCANLINE_PAD - 1)) / BITMAP_SCANLINE_PAD;

-    lastWidth = (lastWidth + (BITMAP_SCANLINE_PAD - 1)) / BITMAP_SCANLINE_PAD;

-

-    if ((lineWidth * (y - 1) + lastWidth) >

-	(scrp->videoRam * ((1024 * 8) / BITMAP_SCANLINE_PAD)))

-	return FALSE;

-

-    return TRUE;

-}

-

-/*

- * xf86InitialCheckModeForDriver

- *

- * This function checks if a mode satisfies a driver's initial requirements:

- *   -  mode size fits within the available pixel area (memory)

- *   -  width lies within the range of supported line pitches

- *   -  mode size fits within virtual size (if fixed)

- *   -  horizontal timings are in range

- *

- * This function takes the following parameters:

- *    scrp         ScrnInfoPtr

- *    mode         mode to check

- *    maxPitch     (optional) maximum line pitch

- *    virtualX     (optional) virtual width requested

- *    virtualY     (optional) virtual height requested

- *

- * In addition, the following fields from the ScrnInfoRec are used:

- *    monitor      pointer to structure for monitor section

- *    fbFormat     pixel format for the framebuffer

- *    videoRam     video memory size (in kB)

- *    maxHValue    maximum horizontal timing value

- *    maxVValue    maximum vertical timing value

- */

-

-ModeStatus

-xf86InitialCheckModeForDriver(ScrnInfoPtr scrp, DisplayModePtr mode,

-			      ClockRangePtr clockRanges,

-			      LookupModeFlags strategy,

-			      int maxPitch, int virtualX, int virtualY)

-{

-    ClockRangePtr cp;

-    ModeStatus status;

-    Bool allowDiv2 = (strategy & LOOKUP_CLKDIV2) != 0;

-    int i, needDiv2;

-    

-    /* Sanity checks */

-    if (!scrp || !mode || !clockRanges) {

-	ErrorF("xf86InitialCheckModeForDriver: "

-		"called with invalid parameters\n");

-	return MODE_ERROR;

-    }

-

-    DebugF("xf86InitialCheckModeForDriver(%p, %p %s, %p, 0x%x, %d, %d, %d)\n",

-	   scrp, mode, mode->name , clockRanges, strategy, maxPitch,  virtualX, virtualY);

-

-    /* Some basic mode validity checks */

-    if (0 >= mode->HDisplay || mode->HDisplay > mode->HSyncStart ||

-	mode->HSyncStart >= mode->HSyncEnd || mode->HSyncEnd >= mode->HTotal)

-	return MODE_H_ILLEGAL;

-

-    if (0 >= mode->VDisplay || mode->VDisplay > mode->VSyncStart ||

-	mode->VSyncStart >= mode->VSyncEnd || mode->VSyncEnd >= mode->VTotal)

-	return MODE_V_ILLEGAL;

-

-    if (!xf86CheckModeSize(scrp, mode->HDisplay, mode->HDisplay,

-				 mode->VDisplay))

-        return MODE_MEM;

-

-    if (maxPitch > 0 && mode->HDisplay > maxPitch)

-	return MODE_BAD_WIDTH;

-

-    if (virtualX > 0 && mode->HDisplay > virtualX)

-	return MODE_VIRTUAL_X;

-

-    if (virtualY > 0 && mode->VDisplay > virtualY)

-	return MODE_VIRTUAL_Y;

-

-    if (scrp->maxHValue > 0 && mode->HTotal > scrp->maxHValue)

-	return MODE_BAD_HVALUE;

-

-    if (scrp->maxVValue > 0 && mode->VTotal > scrp->maxVValue)

-	return MODE_BAD_VVALUE;

-

-    /*

-     * The use of the DisplayModeRec's Crtc* and SynthClock elements below is

-     * provisional, in that they are later reused by the driver at mode-set

-     * time.  Here, they are temporarily enlisted to contain the mode timings

-     * as seen by the CRT or panel (rather than the CRTC).  The driver's

-     * ValidMode() is allowed to modify these so it can deal with such things

-     * as mode stretching and/or centering.  The driver should >NOT< modify the

-     * user-supplied values as these are reported back when mode validation is

-     * said and done.

-     */

-    /*

-     * NOTE: We (ab)use the mode->Crtc* values here to store timing

-     * information for the calculation of Hsync and Vrefresh. Before

-     * these values are calculated the driver is given the opportunity

-     * to either set these HSync and VRefresh itself or modify the timing

-     * values.

-     * The difference to the final calculation is small but imortand:

-     * here we pass the flag INTERLACE_HALVE_V regardless if the driver

-     * sets it or not. This way our calculation of VRefresh has the same

-     * effect as if we do if (flags & V_INTERLACE) refresh *= 2.0

-     * This dual use of the mode->Crtc* values will certainly create

-     * confusion and is bad software design. However since it's part of

-     * the driver API it's hard to change.

-     */

-     

-    if (scrp->ValidMode) {

-	

-	xf86SetModeCrtc(mode, INTERLACE_HALVE_V);

-

-	cp = xf86FindClockRangeForMode(clockRanges, mode);

-	if (!cp)

-	    return MODE_CLOCK_RANGE;

-

-	if (cp->ClockMulFactor < 1)

-	    cp->ClockMulFactor = 1;

-	if (cp->ClockDivFactor < 1)

-	    cp->ClockDivFactor = 1;

-	

-	/*

-	 * XXX  The effect of clock dividers and multipliers on the monitor's

-	 *      pixel clock needs to be verified.

-	 */

-	if (scrp->progClock) {

-	    mode->SynthClock = mode->Clock;

-	} else {

-	    i = xf86GetNearestClock(scrp, mode->Clock, allowDiv2,

-				    cp->ClockDivFactor, cp->ClockMulFactor,

-				    &needDiv2);

-	    mode->SynthClock = (scrp->clock[i] * cp->ClockDivFactor) /

-		cp->ClockMulFactor;

-	    if (needDiv2 & V_CLKDIV2)

-		mode->SynthClock /= 2;

-	}

-

-	status = (*scrp->ValidMode)(scrp->scrnIndex, mode, FALSE,

-				    MODECHECK_INITIAL);

-	if (status != MODE_OK)

-	    return status;

-

-	if (mode->HSync <= 0.0)

-	    mode->HSync = (float)mode->SynthClock / (float)mode->CrtcHTotal;

-	if (mode->VRefresh <= 0.0)

-	    mode->VRefresh = (mode->SynthClock * 1000.0)

-		/ (mode->CrtcHTotal * mode->CrtcVTotal);

-    }

-    

-    mode->HSync = xf86ModeHSync(mode);

-    mode->VRefresh = xf86ModeVRefresh(mode);

-

-    /* Assume it is OK */

-    return MODE_OK;

-}

-

-/*

- * xf86CheckModeForDriver

- *

- * This function is for checking modes while the server is running (for

- * use mainly by the VidMode extension).

- *

- * This function checks if a mode satisfies a driver's requirements:

- *   -  width lies within the line pitch

- *   -  mode size fits within virtual size

- *   -  horizontal/vertical timings are in range

- *

- * This function takes the following parameters:

- *    scrp         ScrnInfoPtr

- *    mode         mode to check

- *    flags        not (currently) used

- *

- * In addition, the following fields from the ScrnInfoRec are used:

- *    maxHValue    maximum horizontal timing value

- *    maxVValue    maximum vertical timing value

- *    virtualX     virtual width

- *    virtualY     virtual height

- *    clockRanges  allowable clock ranges

- */

-

-ModeStatus

-xf86CheckModeForDriver(ScrnInfoPtr scrp, DisplayModePtr mode, int flags)

-{

-    ClockRangePtr cp;

-    int i, k, gap, minimumGap = CLOCK_TOLERANCE + 1;

-    int extraFlags = 0;

-    int clockIndex = -1;

-    int MulFactor = 1;

-    int DivFactor = 1;

-    int ModePrivFlags = 0;

-    ModeStatus status = MODE_NOMODE;

-

-    /* Some sanity checking */

-    if (scrp == NULL ||	(!scrp->progClock && scrp->numClocks == 0)) {

-	ErrorF("xf86CheckModeForDriver: called with invalid scrnInfoRec\n");

-	return MODE_ERROR;

-    }

-    if (mode == NULL) {

-	ErrorF("xf86CheckModeForDriver: called with invalid modep\n");

-	return MODE_ERROR;

-    }

-

-    /* Check the mode size */

-    if (mode->HDisplay > scrp->virtualX)

-	return MODE_VIRTUAL_X;

-

-    if (mode->VDisplay > scrp->virtualY)

-	return MODE_VIRTUAL_Y;

-

-    if (scrp->maxHValue > 0 && mode->HTotal > scrp->maxHValue)

-	return MODE_BAD_HVALUE;

-

-    if (scrp->maxVValue > 0 && mode->VTotal > scrp->maxVValue)

-	return MODE_BAD_VVALUE;

-

-    for (cp = scrp->clockRanges; cp != NULL; cp = cp->next) {

-	/* DivFactor and MulFactor must be > 0 */

-	cp->ClockDivFactor = max(1, cp->ClockDivFactor);

-	cp->ClockMulFactor = max(1, cp->ClockMulFactor);

-    }

-

-    if (scrp->progClock) {

-	/* Check clock is in range */

-	for (cp = scrp->clockRanges; cp != NULL; cp = cp->next) {

-	    if (modeInClockRange(cp, mode))

-	        break;

-	}

-	if (cp == NULL) {

-	    return MODE_CLOCK_RANGE;

-	}

-	/*

-	 * If programmable clock the required mode has been found

-	 */

-    	DivFactor = cp->ClockDivFactor;

-	MulFactor = cp->ClockMulFactor;

-	ModePrivFlags = cp->PrivFlags;

-    } else {

-	 status = MODE_CLOCK_RANGE;

-	/* Check clock is in range */

-	for (cp = scrp->clockRanges; cp != NULL; cp = cp->next) {

-	    if (modeInClockRange(cp, mode)) {

-		/*

-	 	 * Clock is in range, so if it is not a programmable clock,

-		 * find a matching clock.

-		 */

-    

-		i = xf86GetNearestClock(scrp, mode->Clock, 0,

-			   cp->ClockDivFactor, cp->ClockMulFactor, &k);

-		/*

-		 * If the clock is too far from the requested clock, this

-		 * mode is no good.

-		 */

-		if (k & V_CLKDIV2)

-		    gap = abs((mode->Clock * 2) -

-			      ((scrp->clock[i] * cp->ClockDivFactor) /

-			       cp->ClockMulFactor));

-		else

-		    gap = abs(mode->Clock -

-			      ((scrp->clock[i] * cp->ClockDivFactor) /

-			       cp->ClockMulFactor));

-		if (gap > minimumGap) {

-		    status = MODE_NOCLOCK;

-		    continue;

-		}

-		

-		DivFactor = cp->ClockDivFactor;

-		MulFactor = cp->ClockMulFactor;

-		ModePrivFlags = cp->PrivFlags;

-		extraFlags = k;

-		clockIndex = i;

-		break;

-	    }

-	}

-	if (cp == NULL)

-	    return status;

-    }

-

-    /* Fill in the mode parameters */

-    if (scrp->progClock) {

-	mode->ClockIndex	= -1;

-	mode->SynthClock	= (mode->Clock * MulFactor) / DivFactor;

-    } else {

-	mode->Clock		= (scrp->clock[clockIndex] * DivFactor) / MulFactor;

-	mode->ClockIndex	= clockIndex;

-	mode->SynthClock	= scrp->clock[clockIndex];

-	if (extraFlags & V_CLKDIV2) {

-	    mode->Clock /= 2;

-	    mode->SynthClock /= 2;

-	}

-    }

-    mode->PrivFlags		= ModePrivFlags;

-

-    return MODE_OK;

-}

-

-static int 

-inferVirtualSize(ScrnInfoPtr scrp, DisplayModePtr modes, int *vx, int *vy)

-{

-    float aspect = 0.0;

-    MonPtr mon = scrp->monitor;

-    xf86MonPtr DDC;

-    int x = 0, y = 0;

-    DisplayModePtr mode;

-

-    if (!mon) return 0;

-    DDC = mon->DDC;

-

-    if (DDC && DDC->ver.revision >= 4) {

-	/* For 1.4, we might actually get native pixel format.  How novel. */

-	if (PREFERRED_TIMING_MODE(DDC->features.msc)) {

-		for (mode = modes; mode; mode = mode->next) {

-		    if (mode->type & (M_T_DRIVER | M_T_PREFERRED)) {

-			x = mode->HDisplay;

-			y = mode->VDisplay;

-			goto found;

-		    }

-		}

-	}

-	/*

-	 * Even if we don't, we might get aspect ratio from extra CVT info

-	 * or from the monitor size fields.  TODO.

-	 */

-    }

-

-    /*

-     * Technically this triggers if either is zero.  That wasn't legal

-     * before EDID 1.4, but right now we'll get that wrong. TODO.

-     */

-    if (!aspect) {

-	if (!mon->widthmm || !mon->heightmm)

-	    aspect = 4.0/3.0;

-	else

-	    aspect = (float)mon->widthmm / (float)mon->heightmm;

-    }

-

-    /* find the largest M_T_DRIVER mode with that aspect ratio */

-    for (mode = modes; mode; mode = mode->next) {

-	float mode_aspect, metaspect;

-	if (!(mode->type & (M_T_DRIVER|M_T_USERDEF)))

-	    continue;

-	mode_aspect = (float)mode->HDisplay / (float)mode->VDisplay;

-	metaspect = aspect / mode_aspect;

-	/* 5% slop or so, since we only get size in centimeters */

-	if (fabs(1.0 - metaspect) < 0.05) {

-	    if ((mode->HDisplay > x) && (mode->VDisplay > y)) {

-		x = mode->HDisplay;

-		y = mode->VDisplay;

-	    }

-	}

-    }

-

-    if (!x || !y) {

-	xf86DrvMsg(scrp->scrnIndex, X_WARNING,

-		   "Unable to estimate virtual size\n");

-	return 0;

-    }

-

-found:

-    *vx = x;

-    *vy = y;

-

-    xf86DrvMsg(scrp->scrnIndex, X_INFO,

-	       "Estimated virtual size for aspect ratio %.4f is %dx%d\n",

-	       aspect, *vx, *vy);

-

-    return 1;

-}

-

-/* Least common multiple */

-static unsigned int

-LCM(unsigned int x, unsigned int y)

-{

-    unsigned int m = x, n = y, o;

-

-    while ((o = m % n))

-    {

-        m = n;

-        n = o;

-    }

-

-    return (x / n) * y;

-}

-

-/*

- * Given various screen attributes, determine the minimum scanline width such

- * that each scanline is server and DDX padded and any pixels with imbedded

- * bank boundaries are off-screen.  This function returns -1 if such a width

- * cannot exist.

- */

-static int

-scanLineWidth(

-    unsigned int     xsize,         /* pixels */

-    unsigned int     ysize,         /* pixels */

-    unsigned int     width,         /* pixels */

-    unsigned long    BankSize,      /* char's */

-    PixmapFormatRec *pBankFormat,

-    unsigned int     nWidthUnit     /* bits */

-)

-{

-    unsigned long nBitsPerBank, nBitsPerScanline, nBitsPerScanlinePadUnit;

-    unsigned long minBitsPerScanline, maxBitsPerScanline;

-

-    /* Sanity checks */

-

-    if (!nWidthUnit || !pBankFormat)

-        return -1;

-

-    nBitsPerBank = BankSize * 8;

-    if (nBitsPerBank % pBankFormat->scanlinePad)

-        return -1;

-

-    if (xsize > width)

-        width = xsize;

-    nBitsPerScanlinePadUnit = LCM(pBankFormat->scanlinePad, nWidthUnit);

-    nBitsPerScanline =

-        (((width * pBankFormat->bitsPerPixel) + nBitsPerScanlinePadUnit - 1) /

-         nBitsPerScanlinePadUnit) * nBitsPerScanlinePadUnit;

-    width = nBitsPerScanline / pBankFormat->bitsPerPixel;

-

-    if (!xsize || !(nBitsPerBank % pBankFormat->bitsPerPixel))

-        return (int)width;

-

-    /*

-     * Scanlines will be server-pad aligned at this point.  They will also be

-     * a multiple of nWidthUnit bits long.  Ensure that pixels with imbedded

-     * bank boundaries are off-screen.

-     *

-     * It seems reasonable to limit total frame buffer size to 1/16 of the

-     * theoretical maximum address space size.  On a machine with 32-bit

-     * addresses (to 8-bit quantities) this turns out to be 256MB.  Not only

-     * does this provide a simple limiting condition for the loops below, but

-     * it also prevents unsigned long wraparounds.

-     */

-    if (!ysize)

-        return -1;

-

-    minBitsPerScanline = xsize * pBankFormat->bitsPerPixel;

-    if (minBitsPerScanline > nBitsPerBank)

-        return -1;

-

-    if (ysize == 1)

-        return (int)width;

-

-    maxBitsPerScanline =

-        (((unsigned long)(-1) >> 1) - minBitsPerScanline) / (ysize - 1);

-    while (nBitsPerScanline <= maxBitsPerScanline)

-    {

-        unsigned long BankBase, BankUnit;

-

-        BankUnit = ((nBitsPerBank + nBitsPerScanline - 1) / nBitsPerBank) *

-            nBitsPerBank;

-        if (!(BankUnit % nBitsPerScanline))

-            return (int)width;

-

-        for (BankBase = BankUnit;  ;  BankBase += nBitsPerBank)

-        {

-            unsigned long x, y;

-

-            y = BankBase / nBitsPerScanline;

-            if (y >= ysize)

-                return (int)width;

-

-            x = BankBase % nBitsPerScanline;

-            if (!(x % pBankFormat->bitsPerPixel))

-                continue;

-

-            if (x < minBitsPerScanline)

-            {

-                /*

-                 * Skip ahead certain widths by dividing the excess scanline

-                 * amongst the y's.

-                 */

-                y *= nBitsPerScanlinePadUnit;

-                nBitsPerScanline +=

-                    ((x + y - 1) / y) * nBitsPerScanlinePadUnit;

-                width = nBitsPerScanline / pBankFormat->bitsPerPixel;

-                break;

-            }

-

-            if (BankBase != BankUnit)

-                continue;

-

-            if (!(nBitsPerScanline % x))

-                return (int)width;

-

-            BankBase = ((nBitsPerScanline - minBitsPerScanline) /

-                (nBitsPerScanline - x)) * BankUnit;

-        }

-    }

-

-    return -1;

-}

-

-/*

- * xf86ValidateModes

- *

- * This function takes a set of mode names, modes and limiting conditions,

- * and selects a set of modes and parameters based on those conditions.

- *

- * This function takes the following parameters:

- *    scrp         ScrnInfoPtr

- *    availModes   the list of modes available for the monitor

- *    modeNames    (optional) list of mode names that the screen is requesting

- *    clockRanges  a list of clock ranges

- *    linePitches  (optional) a list of line pitches

- *    minPitch     (optional) minimum line pitch (in pixels)

- *    maxPitch     (optional) maximum line pitch (in pixels)

- *    pitchInc     (mandatory) pitch increment (in bits)

- *    minHeight    (optional) minimum virtual height (in pixels)

- *    maxHeight    (optional) maximum virtual height (in pixels)

- *    virtualX     (optional) virtual width requested (in pixels)

- *    virtualY     (optional) virtual height requested (in pixels)

- *    apertureSize size of video aperture (in bytes)

- *    strategy     how to decide which mode to use from multiple modes with

- *                 the same name

- *

- * In addition, the following fields from the ScrnInfoRec are used:

- *    clocks       a list of discrete clocks

- *    numClocks    number of discrete clocks

- *    progClock    clock is programmable

- *    monitor      pointer to structure for monitor section

- *    fbFormat     format of the framebuffer

- *    videoRam     video memory size

- *    maxHValue    maximum horizontal timing value

- *    maxVValue    maximum vertical timing value

- *    xInc         horizontal timing increment (defaults to 8 pixels)

- *

- * The function fills in the following ScrnInfoRec fields:

- *    modePool     A subset of the modes available to the monitor which

- *		   are compatible with the driver.

- *    modes        one mode entry for each of the requested modes, with the

- *                 status field filled in to indicate if the mode has been

- *                 accepted or not.

- *    virtualX     the resulting virtual width

- *    virtualY     the resulting virtual height

- *    displayWidth the resulting line pitch

- *

- * The function's return value is the number of matching modes found, or -1

- * if an unrecoverable error was encountered.

- */

-

-int

-xf86ValidateModes(ScrnInfoPtr scrp, DisplayModePtr availModes,

-		  char **modeNames, ClockRangePtr clockRanges,

-		  int *linePitches, int minPitch, int maxPitch, int pitchInc,

-		  int minHeight, int maxHeight, int virtualX, int virtualY,

-		  int apertureSize, LookupModeFlags strategy)

-{

-    DisplayModePtr p, q, r, new, last, *endp;

-    int i, numModes = 0;

-    ModeStatus status;

-    int linePitch = -1, virtX = 0, virtY = 0;

-    int newLinePitch, newVirtX, newVirtY;

-    int modeSize;					/* in pixels */

-    Bool validateAllDefaultModes = FALSE;

-    Bool userModes = FALSE;

-    int saveType;

-    PixmapFormatRec *BankFormat;

-    ClockRangePtr cp;

-    ClockRangePtr storeClockRanges;

-    int numTimings = 0;

-    range hsync[MAX_HSYNC];

-    range vrefresh[MAX_VREFRESH];

-    Bool inferred_virtual = FALSE;

-

-    DebugF("xf86ValidateModes(%p, %p, %p, %p,\n\t\t  %p, %d, %d, %d, %d, %d, %d, %d, %d, 0x%x)\n",

-	   scrp, availModes, modeNames, clockRanges,

-	   linePitches, minPitch, maxPitch, pitchInc,

-	   minHeight, maxHeight, virtualX, virtualY,

-	   apertureSize, strategy

-	   );

-

-    /* Some sanity checking */

-    if (scrp == NULL || scrp->name == NULL || !scrp->monitor ||

-	(!scrp->progClock && scrp->numClocks == 0)) {

-	ErrorF("xf86ValidateModes: called with invalid scrnInfoRec\n");

-	return -1;

-    }

-    if (linePitches != NULL && linePitches[0] <= 0) {

-	ErrorF("xf86ValidateModes: called with invalid linePitches\n");

-	return -1;

-    }

-    if (pitchInc <= 0) {

-	ErrorF("xf86ValidateModes: called with invalid pitchInc\n");

-	return -1;

-    }

-    if ((virtualX > 0) != (virtualY > 0)) {

-	ErrorF("xf86ValidateModes: called with invalid virtual resolution\n");

-	return -1;

-    }

-

-    /*

-     * If requested by the driver, allow missing hsync and/or vrefresh ranges

-     * in the monitor section.

-     */

-    if (strategy & LOOKUP_OPTIONAL_TOLERANCES) {

-	strategy &= ~LOOKUP_OPTIONAL_TOLERANCES;

-    } else {

-	const char *type = "";

-        Bool specified = FALSE;

-

-	if (scrp->monitor->nHsync <= 0) {

-	    if (numTimings > 0) {

-		scrp->monitor->nHsync = numTimings;

-		for (i = 0; i < numTimings; i++) {

-		    scrp->monitor->hsync[i].lo = hsync[i].lo;

-		    scrp->monitor->hsync[i].hi = hsync[i].hi;

-		}

-	    } else {

-		scrp->monitor->hsync[0].lo = 31.5;

-		scrp->monitor->hsync[0].hi = 48.0;

-		scrp->monitor->nHsync = 1;

-	    }

-	    type = "default ";

-	} else {

-            specified = TRUE;

-        }

-	for (i = 0; i < scrp->monitor->nHsync; i++) {

-	    if (scrp->monitor->hsync[i].lo == scrp->monitor->hsync[i].hi)

-	      xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			 "%s: Using %shsync value of %.2f kHz\n",

-			 scrp->monitor->id, type,

-			 scrp->monitor->hsync[i].lo);

-	    else

-	      xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			 "%s: Using %shsync range of %.2f-%.2f kHz\n",

-			 scrp->monitor->id, type,

-			 scrp->monitor->hsync[i].lo,

-			 scrp->monitor->hsync[i].hi);

-	}

-

-	type = "";

-	if (scrp->monitor->nVrefresh <= 0) {

-	    if (numTimings > 0) {

-		scrp->monitor->nVrefresh = numTimings;

-		for (i = 0; i < numTimings; i++) {

-		    scrp->monitor->vrefresh[i].lo = vrefresh[i].lo;

-		    scrp->monitor->vrefresh[i].hi = vrefresh[i].hi;

-		}

-	    } else {

-		scrp->monitor->vrefresh[0].lo = 50;

-		scrp->monitor->vrefresh[0].hi = 70;

-		scrp->monitor->nVrefresh = 1;

-	    }

-	    type = "default ";

-	} else {

-            specified = TRUE;

-        }

-	for (i = 0; i < scrp->monitor->nVrefresh; i++) {

-	    if (scrp->monitor->vrefresh[i].lo == scrp->monitor->vrefresh[i].hi)

-	      xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			 "%s: Using %svrefresh value of %.2f Hz\n",

-			 scrp->monitor->id, type,

-			 scrp->monitor->vrefresh[i].lo);

-	    else

-	      xf86DrvMsg(scrp->scrnIndex, X_INFO,

-			 "%s: Using %svrefresh range of %.2f-%.2f Hz\n",

-			 scrp->monitor->id, type,

-			 scrp->monitor->vrefresh[i].lo,

-			 scrp->monitor->vrefresh[i].hi);

-	}

-

-        type = "";

-	if (!scrp->monitor->maxPixClock && !specified) {

-            type = "default ";

-            scrp->monitor->maxPixClock = 65000.0;

-        }

-	if (scrp->monitor->maxPixClock) {

-	    xf86DrvMsg(scrp->scrnIndex, X_INFO,

-		       "%s: Using %smaximum pixel clock of %.2f MHz\n",

-		       scrp->monitor->id, type,

-		       (float)scrp->monitor->maxPixClock / 1000.0);

-	}

-    }

-

-    /*

-     * Store the clockRanges for later use by the VidMode extension.

-     */

-    storeClockRanges = scrp->clockRanges;

-    while (storeClockRanges != NULL) {

-	storeClockRanges = storeClockRanges->next;

-    }

-    for (cp = clockRanges; cp != NULL; cp = cp->next,

-	   	storeClockRanges = storeClockRanges->next) {

-	storeClockRanges = xnfalloc(sizeof(ClockRange));

-	if (scrp->clockRanges == NULL)

-	    scrp->clockRanges = storeClockRanges;

-	memcpy(storeClockRanges, cp, sizeof(ClockRange));

-    }

-

-    /* Determine which pixmap format to pass to scanLineWidth() */

-    if (scrp->depth > 4)

-	BankFormat = &scrp->fbFormat;

-    else

-	BankFormat = xf86GetPixFormat(scrp, 1);	/* >not< scrp->depth! */

-

-    if (scrp->xInc <= 0)

-        scrp->xInc = 8;		/* Suitable for VGA and others */

-

-#define _VIRTUALX(x) ((((x) + scrp->xInc - 1) / scrp->xInc) * scrp->xInc)

-

-    /*

-     * Determine maxPitch if it wasn't given explicitly.  Note linePitches

-     * always takes precedence if is non-NULL.  In that case the minPitch and

-     * maxPitch values passed are ignored.

-     */

-    if (linePitches) {

-	minPitch = maxPitch = linePitches[0];

-	for (i = 1; linePitches[i] > 0; i++) {

-	    if (linePitches[i] > maxPitch)

-		maxPitch = linePitches[i];

-	    if (linePitches[i] < minPitch)

-		minPitch = linePitches[i];

-	}

-    }

-

-    /* Initial check of virtual size against other constraints */

-    scrp->virtualFrom = X_PROBED;

-    /*

-     * Initialise virtX and virtY if the values are fixed.

-     */

-    if (virtualY > 0) {

-	if (maxHeight > 0 && virtualY > maxHeight) {

-	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,

-		       "Virtual height (%d) is too large for the hardware "

-		       "(max %d)\n", virtualY, maxHeight);

-	    return -1;

-	}

-

-	if (minHeight > 0 && virtualY < minHeight) {

-	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,

-		       "Virtual height (%d) is too small for the hardware "

-		       "(min %d)\n", virtualY, minHeight);

-	    return -1;

-	}

-

-	virtualX = _VIRTUALX(virtualX);

-	if (linePitches != NULL) {

-	    for (i = 0; linePitches[i] != 0; i++) {

-		if ((linePitches[i] >= virtualX) &&

-		    (linePitches[i] ==

-		     scanLineWidth(virtualX, virtualY, linePitches[i],

-				   apertureSize, BankFormat, pitchInc))) {

-		    linePitch = linePitches[i];

-		    break;

-		}

-	    }

-	} else {

-	    linePitch = scanLineWidth(virtualX, virtualY, minPitch,

-				      apertureSize, BankFormat, pitchInc);

-	}

-

-	if ((linePitch < minPitch) || (linePitch > maxPitch)) {

-	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,

-		       "Virtual width (%d) is too large for the hardware "

-		       "(max %d)\n", virtualX, maxPitch);

-	    return -1;

-	}

-

-	if (!xf86CheckModeSize(scrp, linePitch, virtualX, virtualY)) {

-	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,

-		      "Virtual size (%dx%d) (pitch %d) exceeds video memory\n",

-		      virtualX, virtualY, linePitch);

-	    return -1;

-	}

-

-	virtX = virtualX;

-	virtY = virtualY;

-	scrp->virtualFrom = X_CONFIG;

-    } else if (!modeNames || !*modeNames) {

-	/* No virtual size given in the config, try to infer */

-	/* XXX this doesn't take m{in,ax}Pitch into account; oh well */

-	inferred_virtual = inferVirtualSize(scrp, availModes, &virtX, &virtY);

-	if (inferred_virtual)

-	    linePitch = scanLineWidth(virtX, virtY, minPitch, apertureSize,

-				      BankFormat, pitchInc);

-    }

-

-    /* Print clock ranges and scaled clocks */

-    xf86ShowClockRanges(scrp, clockRanges);

-

-    /*

-     * If scrp->modePool hasn't been setup yet, set it up now.  This allows the

-     * modes that the driver definitely can't use to be weeded out early.  Note

-     * that a modePool mode's prev field is used to hold a pointer to the

-     * member of the scrp->modes list for which a match was considered.

-     */

-    if (scrp->modePool == NULL) {

-	q = NULL;

-	for (p = availModes; p != NULL; p = p->next) {

-	    status = xf86InitialCheckModeForDriver(scrp, p, clockRanges,

-						   strategy, maxPitch,

-						   virtX, virtY);

-

-	    if (status == MODE_OK) {

-		status = xf86CheckModeForMonitor(p, scrp->monitor);

-	    }

-	    

-	    if (status == MODE_OK) {

-		new = xnfalloc(sizeof(DisplayModeRec));

-		*new = *p;

-		new->next = NULL;

-		if (!q) {

-		    scrp->modePool = new;

-		} else {

-		    q->next = new;

-		}

-		new->prev = NULL;

-		q = new;

-		q->name = xnfstrdup(p->name);

-	        q->status = MODE_OK;

-	    } else {

-		printModeRejectMessage(scrp->scrnIndex, p, status);

-	    }

-	}

-

-	if (scrp->modePool == NULL) {

-	    xf86DrvMsg(scrp->scrnIndex, X_WARNING, "Mode pool is empty\n");

-	    return 0;

-	}

-    } else {

-	for (p = scrp->modePool; p != NULL; p = p->next) {

-	    p->prev = NULL;

-	    p->status = MODE_OK;

-	}

-    }

-

-    /*

-     * Allocate one entry in scrp->modes for each named mode.

-     */

-    while (scrp->modes)

-	xf86DeleteMode(&scrp->modes, scrp->modes);

-    endp = &scrp->modes;

-    last = NULL;

-    if (modeNames != NULL) {

-	for (i = 0; modeNames[i] != NULL; i++) {

-	    userModes = TRUE;

-	    new = xnfcalloc(1, sizeof(DisplayModeRec));

-	    new->prev = last;

-	    new->type = M_T_USERDEF;

-	    new->name = xnfstrdup(modeNames[i]);

-	    if (new->prev)

-		new->prev->next = new;

-	    *endp = last = new;

-	    endp = &new->next;

-	}

-    }

-

-    /* Lookup each mode */

-#ifdef RANDR

-    if (!xf86Info.disableRandR	

-#ifdef PANORAMIX

-	&& noPanoramiXExtension

-#endif

-	)

-	validateAllDefaultModes = TRUE;

-#endif

-

-    for (p = scrp->modes; ; p = p->next) {

-	Bool repeat;

-

-	/*

-	 * If the supplied mode names don't produce a valid mode, scan through

-	 * unconsidered modePool members until one survives validation.  This

-	 * is done in decreasing order by mode pixel area.

-	 */

-

-	if (p == NULL) {

-	    if ((numModes > 0) && !validateAllDefaultModes)

-		break;

-

-	    validateAllDefaultModes = TRUE;

-	    r = NULL;

-	    modeSize = 0;

-	    for (q = scrp->modePool;  q != NULL;  q = q->next) {

-		if ((q->prev == NULL) && (q->status == MODE_OK)) {

-		    /*

-		     * Deal with the case where this mode wasn't considered

-		     * because of a builtin mode of the same name.

-		     */

-		    for (p = scrp->modes; p != NULL; p = p->next) {

-			if ((p->status != MODE_OK) &&

-			    !strcmp(p->name, q->name))

-			    break;

-		    }

-

-		    if (p != NULL)

-			q->prev = p;

-		    else {

-			/*

-			 * A quick check to not allow default modes with

-			 * horizontal timing parameters that CRTs may have

-			 * problems with.

-			 */

-			if (!scrp->monitor->reducedblanking &&

-			    (q->type & M_T_DEFAULT) &&

-			    ((double)q->HTotal / (double)q->HDisplay) < 1.15)

-			    continue;

-

-			if (modeSize < (q->HDisplay * q->VDisplay)) {

-			    r = q;

-			    modeSize = q->HDisplay * q->VDisplay;

-			}

-		    }

-		}

-	    }

-

-	    if (r == NULL)

-		break;

-

-	    p = xnfcalloc(1, sizeof(DisplayModeRec));

-	    p->prev = last;

-	    p->name = xnfstrdup(r->name);

-	    if (!userModes)

-		p->type = M_T_USERDEF;

-	    if (p->prev)

-		p->prev->next = p;

-	    *endp = last = p;

-	    endp = &p->next;

-	}

-

-	repeat = FALSE;

-    lookupNext:

-	if (repeat && ((status = p->status) != MODE_OK))

-	    printModeRejectMessage(scrp->scrnIndex, p, status);

-	saveType = p->type;

-	status = xf86LookupMode(scrp, p, clockRanges, strategy);

-	if (repeat && status == MODE_NOMODE)

-	    continue;

-	if (status != MODE_OK)

-	    printModeRejectMessage(scrp->scrnIndex, p, status);

-	if (status == MODE_ERROR) {

-	    ErrorF("xf86ValidateModes: "

-		   "unexpected result from xf86LookupMode()\n");

-	    return -1;

-	}

-	if (status != MODE_OK) {

-	    if (p->status == MODE_OK)

-		p->status = status;

-	    continue;

-	}

-	p->type |= saveType;

-	repeat = TRUE;

-

-	newLinePitch = linePitch;

-	newVirtX = virtX;

-	newVirtY = virtY;

-

-	/*

-	 * Don't let non-user defined modes increase the virtual size

-	 */

-	if (!(p->type & M_T_USERDEF) && (numModes > 0)) {

-	    if (p->HDisplay > virtX) {

-		p->status = MODE_VIRTUAL_X;

-		goto lookupNext;

-	    }

-	    if (p->VDisplay > virtY) {

-		p->status = MODE_VIRTUAL_Y;

-		goto lookupNext;

-	    }

-	}

-	/*

-	 * Adjust virtual width and height if the mode is too large for the

-	 * current values and if they are not fixed.

-	 */

-	if (virtualX <= 0 && p->HDisplay > newVirtX)

-	    newVirtX = _VIRTUALX(p->HDisplay);

-	if (virtualY <= 0 && p->VDisplay > newVirtY) {

-	    if (maxHeight > 0 && p->VDisplay > maxHeight) {

-		p->status = MODE_VIRTUAL_Y;	/* ? */

-		goto lookupNext;

-	    }

-	    newVirtY = p->VDisplay;

-	}

-

-	/*

-	 * If virtual resolution is to be increased, revalidate it.

-	 */

-	if ((virtX != newVirtX) || (virtY != newVirtY)) {

-	    if (linePitches != NULL) {

-		newLinePitch = -1;

-		for (i = 0; linePitches[i] != 0; i++) {

-		    if ((linePitches[i] >= newVirtX) &&

-			(linePitches[i] >= linePitch) &&

-			(linePitches[i] ==

-			 scanLineWidth(newVirtX, newVirtY, linePitches[i],

-				       apertureSize, BankFormat, pitchInc))) {

-			newLinePitch = linePitches[i];

-			break;

-		    }

-		}

-	    } else {

-		if (linePitch < minPitch)

-		    linePitch = minPitch;

-		newLinePitch = scanLineWidth(newVirtX, newVirtY, linePitch,

-					     apertureSize, BankFormat,

-					     pitchInc);

-	    }

-	    if ((newLinePitch < minPitch) || (newLinePitch > maxPitch)) {

-		p->status = MODE_BAD_WIDTH;

-		goto lookupNext;

-	    }

-

-	    /*

-	     * Check that the pixel area required by the new virtual height

-	     * and line pitch isn't too large.

-	     */

-	    if (!xf86CheckModeSize(scrp, newLinePitch, newVirtX, newVirtY)) {

-		p->status = MODE_MEM_VIRT;

-		goto lookupNext;

-	    }

-	}

-

-	if (scrp->ValidMode) {

-	    /*

-	     * Give the driver a final say, passing it the proposed virtual

-	     * geometry.

-	     */

-	    scrp->virtualX = newVirtX;

-	    scrp->virtualY = newVirtY;

-	    scrp->displayWidth = newLinePitch;

-	    p->status = (scrp->ValidMode)(scrp->scrnIndex, p, FALSE,

-					  MODECHECK_FINAL);

-

-	    if (p->status != MODE_OK) {

-	        goto lookupNext;

-	    }

-	}

-

-	/* Mode has passed all the tests */

-	virtX = newVirtX;

-	virtY = newVirtY;

-	linePitch = newLinePitch;

-	p->status = MODE_OK;

-	numModes++;

-    }

-

-    /*

-     * If we estimated the virtual size above, we may have filtered away all

-     * the modes that maximally match that size; scan again to find out and

-     * fix up if so.

-     */

-    if (inferred_virtual) {

-	int vx = 0, vy = 0;

-	for (p = scrp->modes; p; p = p->next) {

-	    if (p->HDisplay > vx && p->VDisplay > vy) {

-		vx = p->HDisplay;

-		vy = p->VDisplay;

-	    }

-	}

-	if (vx < virtX || vy < virtY) {

-	    const int types[] = {

-		M_T_BUILTIN | M_T_PREFERRED,

-		M_T_BUILTIN,

-		M_T_DRIVER | M_T_PREFERRED,

-		M_T_DRIVER,

-		0

-	    };

-	    const int ntypes = sizeof(types) / sizeof(int);

-	    int n;

-

-	    /* 

-	     * We did not find the estimated virtual size. So now we want to 

-	     * find the largest mode available, but we want to search in the

-	     * modes in the order of "types" listed above.

-	     */

-	    for (n = 0; n < ntypes; n++) {

-		int type = types[n];

-

-		vx = 0; vy = 0;

-		for (p = scrp->modes; p; p = p->next) {

-		    /* scan through the modes in the sort order above */

-		    if ((p->type & type) != type)

-			continue;

-		    if (p->HDisplay > vx && p->VDisplay > vy) {

-			vx = p->HDisplay;

-			vy = p->VDisplay;

-		    }

-		}

-		if (vx && vy)

-		    /* Found one */

-		    break;

-	    }

-	    xf86DrvMsg(scrp->scrnIndex, X_WARNING,

-		       "Shrinking virtual size estimate from %dx%d to %dx%d\n",

-		       virtX, virtY, vx, vy);

-	    virtX = _VIRTUALX(vx);

-	    virtY = vy;

-	    for (p = scrp->modes; p; p = p->next) {

-		if (numModes > 0) {

-		    if (p->HDisplay > virtX)

-			p->status = MODE_VIRTUAL_X;

-		    if (p->VDisplay > virtY)

-			p->status = MODE_VIRTUAL_Y;

-		    if (p->status != MODE_OK) {

-			numModes--;

-			printModeRejectMessage(scrp->scrnIndex, p, p->status);

-		    }

-		}

-	    }

-	    if (linePitches != NULL) {

-		for (i = 0; linePitches[i] != 0; i++) {

-		    if ((linePitches[i] >= virtX) &&

-			(linePitches[i] ==

-			scanLineWidth(virtX, virtY, linePitches[i],

-				      apertureSize, BankFormat, pitchInc))) {

-			linePitch = linePitches[i];

-			break;

-		    }

-		}

-	    } else {

-		linePitch = scanLineWidth(virtX, virtY, minPitch,

-					  apertureSize, BankFormat, pitchInc);

-	    }

-	}

-    }

-

-    /* Update the ScrnInfoRec parameters */

-    

-    scrp->virtualX = virtX;

-    scrp->virtualY = virtY;

-    scrp->displayWidth = linePitch;

-

-    if (numModes <= 0)

-	return 0;

-    

-    /* Make the mode list into a circular list by joining up the ends */

-    p = scrp->modes;

-    while (p->next != NULL)

-	p = p->next;

-    /* p is now the last mode on the list */

-    p->next = scrp->modes;

-    scrp->modes->prev = p;

-

-    if (minHeight > 0 && virtY < minHeight) {

-	xf86DrvMsg(scrp->scrnIndex, X_ERROR,

-		   "Virtual height (%d) is too small for the hardware "

-		   "(min %d)\n", virtY, minHeight);

-	return -1;

-    }

-

-    return numModes;

-}

-

-/*

- * xf86DeleteMode

- *

- * This function removes a mode from a list of modes.

- *

- * There are different types of mode lists:

- *

- *  - singly linked linear lists, ending in NULL

- *  - doubly linked linear lists, starting and ending in NULL

- *  - doubly linked circular lists

- *

- */

- 

-void

-xf86DeleteMode(DisplayModePtr *modeList, DisplayModePtr mode)

-{

-    /* Catch the easy/insane cases */

-    if (modeList == NULL || *modeList == NULL || mode == NULL)

-	return;

-

-    /* If the mode is at the start of the list, move the start of the list */

-    if (*modeList == mode)

-	*modeList = mode->next;

-

-    /* If mode is the only one on the list, set the list to NULL */

-    if ((mode == mode->prev) && (mode == mode->next)) {

-	*modeList = NULL;

-    } else {

-	if ((mode->prev != NULL) && (mode->prev->next == mode))

-	    mode->prev->next = mode->next;

-	if ((mode->next != NULL) && (mode->next->prev == mode))

-	    mode->next->prev = mode->prev;

-    }

-

-    free(mode->name);

-    free(mode);

-}

-

-/*

- * xf86PruneDriverModes

- *

- * Remove modes from the driver's mode list which have been marked as

- * invalid.

- */

-

-void

-xf86PruneDriverModes(ScrnInfoPtr scrp)

-{

-    DisplayModePtr first, p, n;

-

-    p = scrp->modes;

-    if (p == NULL)

-	return;

-

-    do {

-	if (!(first = scrp->modes))

-	    return;

-	n = p->next;

-	if (p->status != MODE_OK) {

-	    xf86DeleteMode(&(scrp->modes), p);

-	}

-	p = n;

-    } while (p != NULL && p != first);

-

-    /* modePool is no longer needed, turf it */

-    while (scrp->modePool) {

-	/*

-	 * A modePool mode's prev field is used to hold a pointer to the

-	 * member of the scrp->modes list for which a match was considered.

-	 * Clear that pointer first, otherwise xf86DeleteMode might get 

-	 * confused 

-	 */

-	scrp->modePool->prev = NULL;

-	xf86DeleteMode(&scrp->modePool, scrp->modePool);

-    }

-}

-

-

-/*

- * xf86SetCrtcForModes

- *

- * Goes through the screen's mode list, and initialises the Crtc

- * parameters for each mode.  The initialisation includes adjustments

- * for interlaced and double scan modes.

- */

-void

-xf86SetCrtcForModes(ScrnInfoPtr scrp, int adjustFlags)

-{

-    DisplayModePtr p;

-

-    /*

-     * Store adjustFlags for use with the VidMode extension. There is an

-     * implicit assumption here that SetCrtcForModes is called once.

-     */

-    scrp->adjustFlags = adjustFlags;

-

-    p = scrp->modes;

-    if (p == NULL)

-	return;

-

-    do {

-	xf86SetModeCrtc(p, adjustFlags);

-	DebugF("%sMode %s: %d (%d) %d %d (%d) %d %d (%d) %d %d (%d) %d\n",

-	       (p->type & M_T_DEFAULT) ? "Default " : "",

-	       p->name, p->CrtcHDisplay, p->CrtcHBlankStart,

-	       p->CrtcHSyncStart, p->CrtcHSyncEnd, p->CrtcHBlankEnd,

-	       p->CrtcHTotal, p->CrtcVDisplay, p->CrtcVBlankStart,

-	       p->CrtcVSyncStart, p->CrtcVSyncEnd, p->CrtcVBlankEnd,

-	       p->CrtcVTotal);

-	p = p->next;

-    } while (p != NULL && p != scrp->modes);

-}

-

-void

-xf86PrintModes(ScrnInfoPtr scrp)

-{

-    DisplayModePtr p;

-    float hsync, refresh = 0;

-    char *desc, *desc2, *prefix, *uprefix;

-

-    if (scrp == NULL)

-	return;

-

-    xf86DrvMsg(scrp->scrnIndex, scrp->virtualFrom, "Virtual size is %dx%d "

-	       "(pitch %d)\n", scrp->virtualX, scrp->virtualY,

-	       scrp->displayWidth);

-    

-    p = scrp->modes;

-    if (p == NULL)

-	return;

-

-    do {

-	desc = desc2 = "";

-	hsync = xf86ModeHSync(p);

-	refresh = xf86ModeVRefresh(p);

-	if (p->Flags & V_INTERLACE) {

-	    desc = " (I)";

-	}

-	if (p->Flags & V_DBLSCAN) {

-	    desc = " (D)";

-	}

-	if (p->VScan > 1) {

-	    desc2 = " (VScan)";

-	}

-	if (p->type & M_T_BUILTIN)

-	    prefix = "Built-in mode";

-	else if (p->type & M_T_DEFAULT)

-	    prefix = "Default mode";

-	else if (p->type & M_T_DRIVER)

-	    prefix = "Driver mode";

-	else

-	    prefix = "Mode";

-	if (p->type & M_T_USERDEF)

-	    uprefix = "*";

-	else

-	    uprefix = " ";

-	if (hsync == 0 || refresh == 0) {

-	    if (p->name)

-		xf86DrvMsg(scrp->scrnIndex, X_CONFIG,

-			   "%s%s \"%s\"\n", uprefix, prefix, p->name);

-	    else

-		xf86DrvMsg(scrp->scrnIndex, X_PROBED,

-			   "%s%s %dx%d (unnamed)\n",

-			   uprefix, prefix, p->HDisplay, p->VDisplay);

-	} else if (p->Clock == p->SynthClock) {

-	    xf86DrvMsg(scrp->scrnIndex, X_CONFIG,

-			"%s%s \"%s\": %.1f MHz, %.1f kHz, %.1f Hz%s%s\n",

-			uprefix, prefix, p->name, p->Clock / 1000.0,

-			hsync, refresh, desc, desc2);

-	} else {

-	    xf86DrvMsg(scrp->scrnIndex, X_CONFIG,

-			"%s%s \"%s\": %.1f MHz (scaled from %.1f MHz), "

-			"%.1f kHz, %.1f Hz%s%s\n",

-			uprefix, prefix, p->name, p->Clock / 1000.0,

-			p->SynthClock / 1000.0, hsync, refresh, desc, desc2);

-	}

-	if (hsync != 0 && refresh != 0)

-	    xf86PrintModeline(scrp->scrnIndex,p);

-	p = p->next;

-    } while (p != NULL && p != scrp->modes);

-}

+/*
+ * Copyright (c) 1997-2003 by The XFree86 Project, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of the copyright holder(s)
+ * and author(s) shall not be used in advertising or otherwise to promote
+ * the sale, use or other dealings in this Software without prior written
+ * authorization from the copyright holder(s) and author(s).
+ */
+
+/*
+ * LCM() and scanLineWidth() are:
+ *
+ * Copyright 1997 through 2004 by Marc Aurele La France (TSI @ UQV), tsi@xfree86.org
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of Marc Aurele La France not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  Marc Aurele La France makes no representations
+ * about the suitability of this software for any purpose.  It is provided
+ * "as-is" without express or implied warranty.
+ *
+ * MARC AURELE LA FRANCE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO
+ * EVENT SHALL MARC AURELE LA FRANCE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Copyright 1990,91,92,93 by Thomas Roell, Germany.
+ * Copyright 1991,92,93    by SGCS (Snitily Graphics Consulting Services), USA.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this  permission notice appear
+ * in supporting documentation, and that the name of Thomas Roell nor
+ * SGCS be used in advertising or publicity pertaining to distribution
+ * of the software without specific, written prior permission.
+ * Thomas Roell nor SGCS makes no representations about the suitability
+ * of this software for any purpose. It is provided "as is" without
+ * express or implied warranty.
+ *
+ * THOMAS ROELL AND SGCS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THOMAS ROELL OR SGCS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Authors: Dirk Hohndel <hohndel@XFree86.Org>
+ *          David Dawes <dawes@XFree86.Org>
+ *          Marc La France <tsi@XFree86.Org>
+ *          ... and others
+ *
+ * This file includes helper functions for mode related things.
+ */
+
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#endif
+
+#include <X11/X.h>
+#include "xf86Modes.h"
+#include "os.h"
+#include "servermd.h"
+#include "globals.h"
+#include "xf86.h"
+#include "xf86Priv.h"
+#include "edid.h"
+
+static void
+printModeRejectMessage(int index, DisplayModePtr p, int status)
+{
+    const char *type;
+
+    if (p->type & M_T_BUILTIN)
+	type = "built-in ";
+    else if (p->type & M_T_DEFAULT)
+	type = "default ";
+    else if (p->type & M_T_DRIVER)
+	type = "driver ";
+    else
+	type = "";
+
+    xf86DrvMsg(index, X_INFO, "Not using %smode \"%s\" (%s)\n", type, p->name,
+	       xf86ModeStatusToString(status));
+}
+
+/*
+ * xf86GetNearestClock --
+ *	Find closest clock to given frequency (in kHz).  This assumes the
+ *	number of clocks is greater than zero.
+ */
+int
+xf86GetNearestClock(ScrnInfoPtr scrp, int freq, Bool allowDiv2,
+    int DivFactor, int MulFactor, int *divider)
+{
+    int nearestClock = 0, nearestDiv = 1;
+    int minimumGap = abs(freq - scrp->clock[0]);
+    int i, j, k, gap;
+
+    if (allowDiv2)
+	k = 2;
+    else
+	k = 1;
+
+    /* Must set this here in case the best match is scrp->clock[0] */
+    if (divider != NULL)
+	*divider = 0;
+    
+    for (i = 0;  i < scrp->numClocks;  i++) {
+	for (j = 1; j <= k; j++) {
+	    gap = abs((freq * j) - ((scrp->clock[i] * DivFactor) / MulFactor));
+	    if ((gap < minimumGap) ||
+		((gap == minimumGap) && (j < nearestDiv))) {
+		minimumGap = gap;
+		nearestClock = i;
+		nearestDiv = j;
+		if (divider != NULL)
+		    *divider = (j - 1) * V_CLKDIV2;
+	    }
+	}
+    }
+    return nearestClock;
+}
+
+/*
+ * xf86ModeStatusToString
+ *
+ * Convert a ModeStatus value to a printable message
+ */
+
+const char *
+xf86ModeStatusToString(ModeStatus status)
+{
+    switch (status) {
+    case MODE_OK:
+	return "Mode OK";
+    case MODE_HSYNC:
+	return "hsync out of range";
+    case MODE_VSYNC:
+	return "vrefresh out of range";
+    case MODE_H_ILLEGAL:
+	return "illegal horizontal timings";
+    case MODE_V_ILLEGAL:
+	return "illegal vertical timings";
+    case MODE_BAD_WIDTH:
+	return "width requires unsupported line pitch";
+    case MODE_NOMODE:
+	return "no mode of this name";
+    case MODE_NO_INTERLACE:
+	return "interlace mode not supported";
+    case MODE_NO_DBLESCAN:
+	return "doublescan mode not supported";
+    case MODE_NO_VSCAN:
+	return "multiscan mode not supported";
+    case MODE_MEM:
+	return "insufficient memory for mode";
+    case MODE_VIRTUAL_X:
+	return "width too large for virtual size";
+    case MODE_VIRTUAL_Y:
+	return "height too large for virtual size";
+    case MODE_MEM_VIRT:
+	return "insufficient memory given virtual size";
+    case MODE_NOCLOCK:
+	return "no clock available for mode";
+    case MODE_CLOCK_HIGH:
+	return "mode clock too high";
+    case MODE_CLOCK_LOW:
+	return "mode clock too low";
+    case MODE_CLOCK_RANGE:
+	return "bad mode clock/interlace/doublescan";
+    case MODE_BAD_HVALUE:
+	return "horizontal timing out of range";
+    case MODE_BAD_VVALUE:
+	return "vertical timing out of range";
+    case MODE_BAD_VSCAN:
+	return "VScan value out of range";
+    case MODE_HSYNC_NARROW:
+	return "horizontal sync too narrow";
+    case MODE_HSYNC_WIDE:
+	return "horizontal sync too wide";
+    case MODE_HBLANK_NARROW:
+	return "horizontal blanking too narrow";
+    case MODE_HBLANK_WIDE:
+	return "horizontal blanking too wide";
+    case MODE_VSYNC_NARROW:
+	return "vertical sync too narrow";
+    case MODE_VSYNC_WIDE:
+	return "vertical sync too wide";
+    case MODE_VBLANK_NARROW:
+	return "vertical blanking too narrow";
+    case MODE_VBLANK_WIDE:
+	return "vertical blanking too wide";
+    case MODE_PANEL:
+	return "exceeds panel dimensions";
+    case MODE_INTERLACE_WIDTH:
+	return "width too large for interlaced mode";
+    case MODE_ONE_WIDTH:
+        return "all modes must have the same width";
+    case MODE_ONE_HEIGHT:
+        return "all modes must have the same height";
+    case MODE_ONE_SIZE:
+        return "all modes must have the same resolution";
+    case MODE_NO_REDUCED:
+        return "monitor doesn't support reduced blanking";
+    case MODE_BANDWIDTH:
+	return "mode requires too much memory bandwidth";
+    case MODE_BAD:
+	return "unknown reason";
+    case MODE_ERROR:
+	return "internal error";
+    default:
+	return "unknown";
+    }
+}
+
+/*
+ * xf86ShowClockRanges() -- Print the clock ranges allowed
+ * and the clock values scaled by ClockMulFactor and ClockDivFactor
+ */
+void
+xf86ShowClockRanges(ScrnInfoPtr scrp, ClockRangePtr clockRanges)
+{
+    ClockRangePtr cp;
+    int MulFactor = 1;
+    int DivFactor = 1;
+    int i, j;
+    int scaledClock;
+
+    for (cp = clockRanges; cp != NULL; cp = cp->next) {
+	DivFactor = max(1, cp->ClockDivFactor);
+	MulFactor = max(1, cp->ClockMulFactor);
+	if (scrp->progClock) {
+	    if (cp->minClock) {
+		if (cp->maxClock) {
+		    xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			"Clock range: %6.2f to %6.2f MHz\n",
+			(double)cp->minClock / 1000.0,
+			(double)cp->maxClock / 1000.0);
+		} else {
+		    xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			"Minimum clock: %6.2f MHz\n",
+			(double)cp->minClock / 1000.0);
+		}
+	    } else {
+		if (cp->maxClock) {
+		    xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			"Maximum clock: %6.2f MHz\n",
+			(double)cp->maxClock / 1000.0);
+		}
+	    }
+	} else if (DivFactor > 1 || MulFactor > 1) {
+	    j = 0;
+	    for (i = 0; i < scrp->numClocks; i++) {
+		scaledClock = (scrp->clock[i] * DivFactor) / MulFactor;
+		if (scaledClock >= cp->minClock && scaledClock <= cp->maxClock) {
+		    if ((j % 8) == 0) {
+			if (j > 0)
+			    xf86ErrorF("\n");
+			xf86DrvMsg(scrp->scrnIndex, X_INFO, "scaled clocks:");
+		    }
+		    xf86ErrorF(" %6.2f", (double)scaledClock / 1000.0);
+		    j++;
+		}
+	    }
+	    xf86ErrorF("\n");
+	}
+    }
+}
+
+static Bool
+modeInClockRange(ClockRangePtr cp, DisplayModePtr p)
+{
+    return ((p->Clock >= cp->minClock) &&
+	    (p->Clock <= cp->maxClock) &&
+	    (cp->interlaceAllowed || !(p->Flags & V_INTERLACE)) &&
+	    (cp->doubleScanAllowed ||
+	     ((p->VScan <= 1) && !(p->Flags & V_DBLSCAN))));
+}
+
+/*
+ * xf86FindClockRangeForMode()    [... like the name says ...]
+ */
+static ClockRangePtr
+xf86FindClockRangeForMode(ClockRangePtr clockRanges, DisplayModePtr p)
+{
+    ClockRangePtr cp;
+
+    for (cp = clockRanges; ; cp = cp->next)
+	if (!cp || modeInClockRange(cp, p))
+	    return cp;
+}
+
+
+/*
+ * xf86HandleBuiltinMode() - handles built-in modes
+ */
+static ModeStatus
+xf86HandleBuiltinMode(ScrnInfoPtr scrp,
+		      DisplayModePtr p,
+		      DisplayModePtr modep,
+		      ClockRangePtr clockRanges,
+		      Bool allowDiv2)
+{
+    ClockRangePtr cp;
+    int extraFlags = 0;
+    int MulFactor = 1;
+    int DivFactor = 1;
+    int clockIndex;
+    
+    /* Reject previously rejected modes */
+    if (p->status != MODE_OK)
+	return p->status;
+
+    /* Reject previously considered modes */
+    if (p->prev)
+        return MODE_NOMODE;
+
+    if ((p->type & M_T_CLOCK_C) == M_T_CLOCK_C) {
+	/* Check clock is in range */
+	cp = xf86FindClockRangeForMode(clockRanges, p);
+	if (cp == NULL){
+	    modep->type = p->type;
+	    p->status = MODE_CLOCK_RANGE;
+	    return MODE_CLOCK_RANGE;
+	}
+	DivFactor = cp->ClockDivFactor;
+	MulFactor = cp->ClockMulFactor;
+	if (!scrp->progClock) {
+	    clockIndex = xf86GetNearestClock(scrp, p->Clock, allowDiv2,
+					     cp->ClockDivFactor,
+					     cp->ClockMulFactor, &extraFlags);
+	    modep->Clock = (scrp->clock[clockIndex] * DivFactor)
+		/ MulFactor;
+	    modep->ClockIndex	= clockIndex;
+	    modep->SynthClock	= scrp->clock[clockIndex];
+	    if (extraFlags & V_CLKDIV2) {
+		modep->Clock /= 2;
+		modep->SynthClock /= 2;
+	    }
+	} else {
+	    modep->Clock = p->Clock;
+	    modep->ClockIndex = -1;
+	    modep->SynthClock = (modep->Clock * MulFactor)
+		/ DivFactor;
+	}
+	modep->PrivFlags = cp->PrivFlags;
+    } else {
+	if(!scrp->progClock) {
+            modep->Clock = p->Clock;
+	    modep->ClockIndex = p->ClockIndex;
+	    modep->SynthClock = p->SynthClock;
+	} else {
+	    modep->Clock = p->Clock;
+	    modep->ClockIndex = -1;
+	    modep->SynthClock = p->SynthClock;
+	}
+	modep->PrivFlags = p->PrivFlags;
+    }
+    modep->type            = p->type;
+    modep->HDisplay        = p->HDisplay;
+    modep->HSyncStart      = p->HSyncStart;
+    modep->HSyncEnd        = p->HSyncEnd;
+    modep->HTotal          = p->HTotal;
+    modep->HSkew           = p->HSkew;
+    modep->VDisplay        = p->VDisplay;
+    modep->VSyncStart      = p->VSyncStart;
+    modep->VSyncEnd        = p->VSyncEnd;
+    modep->VTotal          = p->VTotal;
+    modep->VScan           = p->VScan;
+    modep->Flags           = p->Flags | extraFlags;
+    modep->CrtcHDisplay    = p->CrtcHDisplay;
+    modep->CrtcHBlankStart = p->CrtcHBlankStart;
+    modep->CrtcHSyncStart  = p->CrtcHSyncStart;
+    modep->CrtcHSyncEnd    = p->CrtcHSyncEnd;
+    modep->CrtcHBlankEnd   = p->CrtcHBlankEnd;
+    modep->CrtcHTotal      = p->CrtcHTotal;
+    modep->CrtcHSkew       = p->CrtcHSkew;
+    modep->CrtcVDisplay    = p->CrtcVDisplay;
+    modep->CrtcVBlankStart = p->CrtcVBlankStart;
+    modep->CrtcVSyncStart  = p->CrtcVSyncStart;
+    modep->CrtcVSyncEnd    = p->CrtcVSyncEnd;
+    modep->CrtcVBlankEnd   = p->CrtcVBlankEnd;
+    modep->CrtcVTotal      = p->CrtcVTotal;
+    modep->CrtcHAdjusted   = p->CrtcHAdjusted;
+    modep->CrtcVAdjusted   = p->CrtcVAdjusted;
+    modep->HSync           = p->HSync;
+    modep->VRefresh        = p->VRefresh;
+    modep->Private         = p->Private;
+    modep->PrivSize        = p->PrivSize;
+
+    p->prev = modep;
+    
+    return MODE_OK;
+}
+
+/*
+ * xf86LookupMode
+ *
+ * This function returns a mode from the given list which matches the
+ * given name.  When multiple modes with the same name are available,
+ * the method of picking the matching mode is determined by the
+ * strategy selected.
+ *
+ * This function takes the following parameters:
+ *    scrp         ScrnInfoPtr
+ *    modep        pointer to the returned mode, which must have the name
+ *                 field filled in.
+ *    clockRanges  a list of clock ranges.   This is optional when all the
+ *                 modes are built-in modes.
+ *    strategy     how to decide which mode to use from multiple modes with
+ *                 the same name
+ *
+ * In addition, the following fields from the ScrnInfoRec are used:
+ *    modePool     the list of monitor modes compatible with the driver
+ *    clocks       a list of discrete clocks
+ *    numClocks    number of discrete clocks
+ *    progClock    clock is programmable
+ *
+ * If a mode was found, its values are filled in to the area pointed to
+ * by modep,  If a mode was not found the return value indicates the
+ * reason.
+ */
+
+ModeStatus
+xf86LookupMode(ScrnInfoPtr scrp, DisplayModePtr modep,
+	       ClockRangePtr clockRanges, LookupModeFlags strategy)
+{
+    DisplayModePtr p, bestMode = NULL;
+    ClockRangePtr cp;
+    int i, k, gap, minimumGap = CLOCK_TOLERANCE + 1;
+    double refresh, bestRefresh = 0.0;
+    Bool found = FALSE;
+    int extraFlags = 0;
+    int clockIndex = -1;
+    int MulFactor = 1;
+    int DivFactor = 1;
+    int ModePrivFlags = 0;
+    ModeStatus status = MODE_NOMODE;
+    Bool allowDiv2 = (strategy & LOOKUP_CLKDIV2) != 0;
+    int n;
+    const int types[] = {
+	M_T_BUILTIN | M_T_PREFERRED,
+	M_T_BUILTIN,
+	M_T_USERDEF | M_T_PREFERRED,
+	M_T_USERDEF,
+	M_T_DRIVER | M_T_PREFERRED,
+	M_T_DRIVER,
+	0
+    };
+    const int ntypes = sizeof(types) / sizeof(int);
+
+    strategy &= ~(LOOKUP_CLKDIV2 | LOOKUP_OPTIONAL_TOLERANCES);
+
+    /* Some sanity checking */
+    if (scrp == NULL || scrp->modePool == NULL ||
+	(!scrp->progClock && scrp->numClocks == 0)) {
+	ErrorF("xf86LookupMode: called with invalid scrnInfoRec\n");
+	return MODE_ERROR;
+    }
+    if (modep == NULL || modep->name == NULL) {
+	ErrorF("xf86LookupMode: called with invalid modep\n");
+	return MODE_ERROR;
+    }
+    for (cp = clockRanges; cp != NULL; cp = cp->next) {
+	/* DivFactor and MulFactor must be > 0 */
+	cp->ClockDivFactor = max(1, cp->ClockDivFactor);
+	cp->ClockMulFactor = max(1, cp->ClockMulFactor);
+    }
+
+    /* Scan the mode pool for matching names */
+    for (n = 0; n < ntypes; n++) {
+	int type = types[n];
+	for (p = scrp->modePool; p != NULL; p = p->next) {
+
+	    /* scan through the modes in the sort order above */
+	    if ((p->type & type) != type)
+		continue;
+
+	    if (strcmp(p->name, modep->name) == 0) {
+
+		/* Skip over previously rejected modes */
+		if (p->status != MODE_OK) {
+		    if (!found)
+			status = p->status;
+		    continue;
+		}
+
+		/* Skip over previously considered modes */
+		if (p->prev)
+		    continue;
+
+		if (p->type & M_T_BUILTIN) {
+		    return xf86HandleBuiltinMode(scrp, p,modep, clockRanges,
+			    allowDiv2);
+		}
+
+		/* Check clock is in range */
+		cp = xf86FindClockRangeForMode(clockRanges, p);
+		if (cp == NULL) {
+		    /*
+		     * XXX Could do more here to provide a more detailed
+		     * reason for not finding a mode.
+		     */
+		    p->status = MODE_CLOCK_RANGE;
+		    if (!found)
+			status = MODE_CLOCK_RANGE;
+		    continue;
+		}
+
+		/*
+		 * If programmable clock and strategy is not
+		 * LOOKUP_BEST_REFRESH, the required mode has been found,
+		 * otherwise record the refresh and continue looking.
+		 */
+		if (scrp->progClock) {
+		    found = TRUE;
+		    if (strategy != LOOKUP_BEST_REFRESH) {
+			bestMode = p;
+			DivFactor = cp->ClockDivFactor;
+			MulFactor = cp->ClockMulFactor;
+			ModePrivFlags = cp->PrivFlags;
+			break;
+		    }
+		    refresh = xf86ModeVRefresh(p);
+		    if (p->Flags & V_INTERLACE)
+			refresh /= INTERLACE_REFRESH_WEIGHT;
+		    if (refresh > bestRefresh) {
+			bestMode = p;
+			DivFactor = cp->ClockDivFactor;
+			MulFactor = cp->ClockMulFactor;
+			ModePrivFlags = cp->PrivFlags;
+			bestRefresh = refresh;
+		    }
+		    continue;
+		}
+
+		/*
+		 * Clock is in range, so if it is not a programmable clock, find
+		 * a matching clock.
+		 */
+
+		i = xf86GetNearestClock(scrp, p->Clock, allowDiv2,
+			cp->ClockDivFactor, cp->ClockMulFactor, &k);
+		/*
+		 * If the clock is too far from the requested clock, this
+		 * mode is no good.
+		 */
+		if (k & V_CLKDIV2)
+		    gap = abs((p->Clock * 2) -
+			    ((scrp->clock[i] * cp->ClockDivFactor) /
+				cp->ClockMulFactor));
+		else
+		    gap = abs(p->Clock -
+			    ((scrp->clock[i] * cp->ClockDivFactor) /
+				cp->ClockMulFactor));
+		if (gap > minimumGap) {
+		    p->status = MODE_NOCLOCK;
+		    if (!found)
+			status = MODE_NOCLOCK;
+		    continue;
+		}
+		found = TRUE;
+
+		if (strategy == LOOKUP_BEST_REFRESH) {
+		    refresh = xf86ModeVRefresh(p);
+		    if (p->Flags & V_INTERLACE)
+			refresh /= INTERLACE_REFRESH_WEIGHT;
+		    if (refresh > bestRefresh) {
+			bestMode = p;
+			DivFactor = cp->ClockDivFactor;
+			MulFactor = cp->ClockMulFactor;
+			ModePrivFlags = cp->PrivFlags;
+			extraFlags = k;
+			clockIndex = i;
+			bestRefresh = refresh;
+		    }
+		    continue;
+		}
+		if (strategy == LOOKUP_CLOSEST_CLOCK) {
+		    if (gap < minimumGap) {
+			bestMode = p;
+			DivFactor = cp->ClockDivFactor;
+			MulFactor = cp->ClockMulFactor;
+			ModePrivFlags = cp->PrivFlags;
+			extraFlags = k;
+			clockIndex = i;
+			minimumGap = gap;
+		    }
+		    continue;
+		}
+		/*
+		 * If strategy is neither LOOKUP_BEST_REFRESH or
+		 * LOOKUP_CLOSEST_CLOCK the required mode has been found.
+		 */
+		bestMode = p;
+		DivFactor = cp->ClockDivFactor;
+		MulFactor = cp->ClockMulFactor;
+		ModePrivFlags = cp->PrivFlags;
+		extraFlags = k;
+		clockIndex = i;
+		break;
+	    }
+	}
+	if (found) break;
+    }
+    if (!found || bestMode == NULL)
+	return status;
+
+    /* Fill in the mode parameters */
+    if (scrp->progClock) {
+        modep->Clock		= bestMode->Clock;
+	modep->ClockIndex	= -1;
+	modep->SynthClock	= (modep->Clock * MulFactor) / DivFactor;
+    } else {
+	modep->Clock		= (scrp->clock[clockIndex] * DivFactor) /
+				    MulFactor;
+	modep->ClockIndex	= clockIndex;
+	modep->SynthClock	= scrp->clock[clockIndex];
+	if (extraFlags & V_CLKDIV2) {
+	    modep->Clock /= 2;
+	    modep->SynthClock /= 2;
+	}
+    }
+    modep->type                 = bestMode->type;
+    modep->PrivFlags		= ModePrivFlags;
+    modep->HDisplay		= bestMode->HDisplay;
+    modep->HSyncStart		= bestMode->HSyncStart;
+    modep->HSyncEnd		= bestMode->HSyncEnd;
+    modep->HTotal		= bestMode->HTotal;
+    modep->HSkew		= bestMode->HSkew;
+    modep->VDisplay		= bestMode->VDisplay;
+    modep->VSyncStart		= bestMode->VSyncStart;
+    modep->VSyncEnd		= bestMode->VSyncEnd;
+    modep->VTotal		= bestMode->VTotal;
+    modep->VScan		= bestMode->VScan;
+    modep->Flags		= bestMode->Flags | extraFlags;
+    modep->CrtcHDisplay		= bestMode->CrtcHDisplay;
+    modep->CrtcHBlankStart	= bestMode->CrtcHBlankStart;
+    modep->CrtcHSyncStart	= bestMode->CrtcHSyncStart;
+    modep->CrtcHSyncEnd		= bestMode->CrtcHSyncEnd;
+    modep->CrtcHBlankEnd	= bestMode->CrtcHBlankEnd;
+    modep->CrtcHTotal		= bestMode->CrtcHTotal;
+    modep->CrtcHSkew		= bestMode->CrtcHSkew;
+    modep->CrtcVDisplay		= bestMode->CrtcVDisplay;
+    modep->CrtcVBlankStart	= bestMode->CrtcVBlankStart;
+    modep->CrtcVSyncStart	= bestMode->CrtcVSyncStart;
+    modep->CrtcVSyncEnd		= bestMode->CrtcVSyncEnd;
+    modep->CrtcVBlankEnd	= bestMode->CrtcVBlankEnd;
+    modep->CrtcVTotal		= bestMode->CrtcVTotal;
+    modep->CrtcHAdjusted	= bestMode->CrtcHAdjusted;
+    modep->CrtcVAdjusted	= bestMode->CrtcVAdjusted;
+    modep->HSync		= bestMode->HSync;
+    modep->VRefresh		= bestMode->VRefresh;
+    modep->Private		= bestMode->Private;
+    modep->PrivSize		= bestMode->PrivSize;
+
+    bestMode->prev = modep;
+
+    return MODE_OK;
+}
+
+/*
+ * xf86CheckModeForMonitor
+ *
+ * This function takes a mode and monitor description, and determines
+ * if the mode is valid for the monitor.
+ */
+ModeStatus
+xf86CheckModeForMonitor(DisplayModePtr mode, MonPtr monitor)
+{
+    int i;
+
+    /* Sanity checks */
+    if (mode == NULL || monitor == NULL) {
+	ErrorF("xf86CheckModeForMonitor: called with invalid parameters\n");
+	return MODE_ERROR;
+    }
+
+    DebugF("xf86CheckModeForMonitor(%p %s, %p %s)\n",
+	   mode, mode->name, monitor, monitor->id);
+
+    /* Some basic mode validity checks */
+    if (0 >= mode->HDisplay || mode->HDisplay > mode->HSyncStart ||
+	mode->HSyncStart >= mode->HSyncEnd || mode->HSyncEnd >= mode->HTotal)
+	return MODE_H_ILLEGAL;
+
+    if (0 >= mode->VDisplay || mode->VDisplay > mode->VSyncStart ||
+	mode->VSyncStart >= mode->VSyncEnd || mode->VSyncEnd >= mode->VTotal)
+	return MODE_V_ILLEGAL;
+
+    if (monitor->nHsync > 0) {
+	/* Check hsync against the allowed ranges */
+	float hsync = xf86ModeHSync(mode);
+	for (i = 0; i < monitor->nHsync; i++) 
+	    if ((hsync > monitor->hsync[i].lo * (1.0 - SYNC_TOLERANCE)) &&
+		(hsync < monitor->hsync[i].hi * (1.0 + SYNC_TOLERANCE)))
+		break;
+	
+	/* Now see whether we ran out of sync ranges without finding a match */
+	if (i == monitor->nHsync) 
+	    return MODE_HSYNC;
+    }
+
+    if (monitor->nVrefresh > 0) {
+	/* Check vrefresh against the allowed ranges */
+	float vrefrsh = xf86ModeVRefresh(mode);
+	for (i = 0; i < monitor->nVrefresh; i++)
+	    if ((vrefrsh > monitor->vrefresh[i].lo * (1.0 - SYNC_TOLERANCE)) &&
+		(vrefrsh < monitor->vrefresh[i].hi * (1.0 + SYNC_TOLERANCE)))
+		break;
+
+	/* Now see whether we ran out of refresh ranges without finding a match */
+	if (i == monitor->nVrefresh)
+	    return MODE_VSYNC;
+    }
+
+    /* Force interlaced modes to have an odd VTotal */
+    if (mode->Flags & V_INTERLACE)
+	mode->CrtcVTotal = mode->VTotal |= 1;
+
+    /*
+     * This code stops cvt -r modes, and only cvt -r modes, from hitting 15y+
+     * old CRTs which might, when there is a lot of solar flare activity and
+     * when the celestial bodies are unfavourably aligned, implode trying to
+     * sync to it. It's called "Protecting the user from doing anything stupid".
+     * -- libv
+     */
+
+    if (xf86ModeIsReduced(mode)) {
+        if (!monitor->reducedblanking && !(mode->type & M_T_DRIVER))
+            return MODE_NO_REDUCED;
+    }
+
+    if ((monitor->maxPixClock) && (mode->Clock > monitor->maxPixClock))
+	return MODE_CLOCK_HIGH;
+
+    return MODE_OK;
+}
+
+/*
+ * xf86CheckModeSize
+ *
+ * An internal routine to check if a mode fits in video memory.  This tries to
+ * avoid overflows that would otherwise occur when video memory size is greater
+ * than 256MB.
+ */
+static Bool
+xf86CheckModeSize(ScrnInfoPtr scrp, int w, int x, int y)
+{
+    int bpp = scrp->fbFormat.bitsPerPixel,
+	pad = scrp->fbFormat.scanlinePad;
+    int lineWidth, lastWidth;
+
+    if (scrp->depth == 4)
+	pad *= 4;		/* 4 planes */
+
+    /* Sanity check */
+    if ((w < 0) || (x < 0) || (y <= 0))
+	return FALSE;
+
+    lineWidth = (((w * bpp) + pad - 1) / pad) * pad;
+    lastWidth = x * bpp;
+
+    /*
+     * At this point, we need to compare
+     *
+     *	(lineWidth * (y - 1)) + lastWidth
+     *
+     * against
+     *
+     *	scrp->videoRam * (1024 * 8)
+     *
+     * These are bit quantities.  To avoid overflows, do the comparison in
+     * terms of BITMAP_SCANLINE_PAD units.  This assumes BITMAP_SCANLINE_PAD
+     * is a power of 2.  We currently use 32, which limits us to a video
+     * memory size of 8GB.
+     */
+
+    lineWidth = (lineWidth + (BITMAP_SCANLINE_PAD - 1)) / BITMAP_SCANLINE_PAD;
+    lastWidth = (lastWidth + (BITMAP_SCANLINE_PAD - 1)) / BITMAP_SCANLINE_PAD;
+
+    if ((lineWidth * (y - 1) + lastWidth) >
+	(scrp->videoRam * ((1024 * 8) / BITMAP_SCANLINE_PAD)))
+	return FALSE;
+
+    return TRUE;
+}
+
+/*
+ * xf86InitialCheckModeForDriver
+ *
+ * This function checks if a mode satisfies a driver's initial requirements:
+ *   -  mode size fits within the available pixel area (memory)
+ *   -  width lies within the range of supported line pitches
+ *   -  mode size fits within virtual size (if fixed)
+ *   -  horizontal timings are in range
+ *
+ * This function takes the following parameters:
+ *    scrp         ScrnInfoPtr
+ *    mode         mode to check
+ *    maxPitch     (optional) maximum line pitch
+ *    virtualX     (optional) virtual width requested
+ *    virtualY     (optional) virtual height requested
+ *
+ * In addition, the following fields from the ScrnInfoRec are used:
+ *    monitor      pointer to structure for monitor section
+ *    fbFormat     pixel format for the framebuffer
+ *    videoRam     video memory size (in kB)
+ *    maxHValue    maximum horizontal timing value
+ *    maxVValue    maximum vertical timing value
+ */
+
+ModeStatus
+xf86InitialCheckModeForDriver(ScrnInfoPtr scrp, DisplayModePtr mode,
+			      ClockRangePtr clockRanges,
+			      LookupModeFlags strategy,
+			      int maxPitch, int virtualX, int virtualY)
+{
+    ClockRangePtr cp;
+    ModeStatus status;
+    Bool allowDiv2 = (strategy & LOOKUP_CLKDIV2) != 0;
+    int i, needDiv2;
+    
+    /* Sanity checks */
+    if (!scrp || !mode || !clockRanges) {
+	ErrorF("xf86InitialCheckModeForDriver: "
+		"called with invalid parameters\n");
+	return MODE_ERROR;
+    }
+
+    DebugF("xf86InitialCheckModeForDriver(%p, %p %s, %p, 0x%x, %d, %d, %d)\n",
+	   scrp, mode, mode->name , clockRanges, strategy, maxPitch,  virtualX, virtualY);
+
+    /* Some basic mode validity checks */
+    if (0 >= mode->HDisplay || mode->HDisplay > mode->HSyncStart ||
+	mode->HSyncStart >= mode->HSyncEnd || mode->HSyncEnd >= mode->HTotal)
+	return MODE_H_ILLEGAL;
+
+    if (0 >= mode->VDisplay || mode->VDisplay > mode->VSyncStart ||
+	mode->VSyncStart >= mode->VSyncEnd || mode->VSyncEnd >= mode->VTotal)
+	return MODE_V_ILLEGAL;
+
+    if (!xf86CheckModeSize(scrp, mode->HDisplay, mode->HDisplay,
+				 mode->VDisplay))
+        return MODE_MEM;
+
+    if (maxPitch > 0 && mode->HDisplay > maxPitch)
+	return MODE_BAD_WIDTH;
+
+    if (virtualX > 0 && mode->HDisplay > virtualX)
+	return MODE_VIRTUAL_X;
+
+    if (virtualY > 0 && mode->VDisplay > virtualY)
+	return MODE_VIRTUAL_Y;
+
+    if (scrp->maxHValue > 0 && mode->HTotal > scrp->maxHValue)
+	return MODE_BAD_HVALUE;
+
+    if (scrp->maxVValue > 0 && mode->VTotal > scrp->maxVValue)
+	return MODE_BAD_VVALUE;
+
+    /*
+     * The use of the DisplayModeRec's Crtc* and SynthClock elements below is
+     * provisional, in that they are later reused by the driver at mode-set
+     * time.  Here, they are temporarily enlisted to contain the mode timings
+     * as seen by the CRT or panel (rather than the CRTC).  The driver's
+     * ValidMode() is allowed to modify these so it can deal with such things
+     * as mode stretching and/or centering.  The driver should >NOT< modify the
+     * user-supplied values as these are reported back when mode validation is
+     * said and done.
+     */
+    /*
+     * NOTE: We (ab)use the mode->Crtc* values here to store timing
+     * information for the calculation of Hsync and Vrefresh. Before
+     * these values are calculated the driver is given the opportunity
+     * to either set these HSync and VRefresh itself or modify the timing
+     * values.
+     * The difference to the final calculation is small but imortand:
+     * here we pass the flag INTERLACE_HALVE_V regardless if the driver
+     * sets it or not. This way our calculation of VRefresh has the same
+     * effect as if we do if (flags & V_INTERLACE) refresh *= 2.0
+     * This dual use of the mode->Crtc* values will certainly create
+     * confusion and is bad software design. However since it's part of
+     * the driver API it's hard to change.
+     */
+     
+    if (scrp->ValidMode) {
+	
+	xf86SetModeCrtc(mode, INTERLACE_HALVE_V);
+
+	cp = xf86FindClockRangeForMode(clockRanges, mode);
+	if (!cp)
+	    return MODE_CLOCK_RANGE;
+
+	if (cp->ClockMulFactor < 1)
+	    cp->ClockMulFactor = 1;
+	if (cp->ClockDivFactor < 1)
+	    cp->ClockDivFactor = 1;
+	
+	/*
+	 * XXX  The effect of clock dividers and multipliers on the monitor's
+	 *      pixel clock needs to be verified.
+	 */
+	if (scrp->progClock) {
+	    mode->SynthClock = mode->Clock;
+	} else {
+	    i = xf86GetNearestClock(scrp, mode->Clock, allowDiv2,
+				    cp->ClockDivFactor, cp->ClockMulFactor,
+				    &needDiv2);
+	    mode->SynthClock = (scrp->clock[i] * cp->ClockDivFactor) /
+		cp->ClockMulFactor;
+	    if (needDiv2 & V_CLKDIV2)
+		mode->SynthClock /= 2;
+	}
+
+	status = (*scrp->ValidMode)(scrp->scrnIndex, mode, FALSE,
+				    MODECHECK_INITIAL);
+	if (status != MODE_OK)
+	    return status;
+
+	if (mode->HSync <= 0.0)
+	    mode->HSync = (float)mode->SynthClock / (float)mode->CrtcHTotal;
+	if (mode->VRefresh <= 0.0)
+	    mode->VRefresh = (mode->SynthClock * 1000.0)
+		/ (mode->CrtcHTotal * mode->CrtcVTotal);
+    }
+    
+    mode->HSync = xf86ModeHSync(mode);
+    mode->VRefresh = xf86ModeVRefresh(mode);
+
+    /* Assume it is OK */
+    return MODE_OK;
+}
+
+/*
+ * xf86CheckModeForDriver
+ *
+ * This function is for checking modes while the server is running (for
+ * use mainly by the VidMode extension).
+ *
+ * This function checks if a mode satisfies a driver's requirements:
+ *   -  width lies within the line pitch
+ *   -  mode size fits within virtual size
+ *   -  horizontal/vertical timings are in range
+ *
+ * This function takes the following parameters:
+ *    scrp         ScrnInfoPtr
+ *    mode         mode to check
+ *    flags        not (currently) used
+ *
+ * In addition, the following fields from the ScrnInfoRec are used:
+ *    maxHValue    maximum horizontal timing value
+ *    maxVValue    maximum vertical timing value
+ *    virtualX     virtual width
+ *    virtualY     virtual height
+ *    clockRanges  allowable clock ranges
+ */
+
+ModeStatus
+xf86CheckModeForDriver(ScrnInfoPtr scrp, DisplayModePtr mode, int flags)
+{
+    ClockRangePtr cp;
+    int i, k, gap, minimumGap = CLOCK_TOLERANCE + 1;
+    int extraFlags = 0;
+    int clockIndex = -1;
+    int MulFactor = 1;
+    int DivFactor = 1;
+    int ModePrivFlags = 0;
+    ModeStatus status = MODE_NOMODE;
+
+    /* Some sanity checking */
+    if (scrp == NULL ||	(!scrp->progClock && scrp->numClocks == 0)) {
+	ErrorF("xf86CheckModeForDriver: called with invalid scrnInfoRec\n");
+	return MODE_ERROR;
+    }
+    if (mode == NULL) {
+	ErrorF("xf86CheckModeForDriver: called with invalid modep\n");
+	return MODE_ERROR;
+    }
+
+    /* Check the mode size */
+    if (mode->HDisplay > scrp->virtualX)
+	return MODE_VIRTUAL_X;
+
+    if (mode->VDisplay > scrp->virtualY)
+	return MODE_VIRTUAL_Y;
+
+    if (scrp->maxHValue > 0 && mode->HTotal > scrp->maxHValue)
+	return MODE_BAD_HVALUE;
+
+    if (scrp->maxVValue > 0 && mode->VTotal > scrp->maxVValue)
+	return MODE_BAD_VVALUE;
+
+    for (cp = scrp->clockRanges; cp != NULL; cp = cp->next) {
+	/* DivFactor and MulFactor must be > 0 */
+	cp->ClockDivFactor = max(1, cp->ClockDivFactor);
+	cp->ClockMulFactor = max(1, cp->ClockMulFactor);
+    }
+
+    if (scrp->progClock) {
+	/* Check clock is in range */
+	for (cp = scrp->clockRanges; cp != NULL; cp = cp->next) {
+	    if (modeInClockRange(cp, mode))
+	        break;
+	}
+	if (cp == NULL) {
+	    return MODE_CLOCK_RANGE;
+	}
+	/*
+	 * If programmable clock the required mode has been found
+	 */
+    	DivFactor = cp->ClockDivFactor;
+	MulFactor = cp->ClockMulFactor;
+	ModePrivFlags = cp->PrivFlags;
+    } else {
+	 status = MODE_CLOCK_RANGE;
+	/* Check clock is in range */
+	for (cp = scrp->clockRanges; cp != NULL; cp = cp->next) {
+	    if (modeInClockRange(cp, mode)) {
+		/*
+	 	 * Clock is in range, so if it is not a programmable clock,
+		 * find a matching clock.
+		 */
+    
+		i = xf86GetNearestClock(scrp, mode->Clock, 0,
+			   cp->ClockDivFactor, cp->ClockMulFactor, &k);
+		/*
+		 * If the clock is too far from the requested clock, this
+		 * mode is no good.
+		 */
+		if (k & V_CLKDIV2)
+		    gap = abs((mode->Clock * 2) -
+			      ((scrp->clock[i] * cp->ClockDivFactor) /
+			       cp->ClockMulFactor));
+		else
+		    gap = abs(mode->Clock -
+			      ((scrp->clock[i] * cp->ClockDivFactor) /
+			       cp->ClockMulFactor));
+		if (gap > minimumGap) {
+		    status = MODE_NOCLOCK;
+		    continue;
+		}
+		
+		DivFactor = cp->ClockDivFactor;
+		MulFactor = cp->ClockMulFactor;
+		ModePrivFlags = cp->PrivFlags;
+		extraFlags = k;
+		clockIndex = i;
+		break;
+	    }
+	}
+	if (cp == NULL)
+	    return status;
+    }
+
+    /* Fill in the mode parameters */
+    if (scrp->progClock) {
+	mode->ClockIndex	= -1;
+	mode->SynthClock	= (mode->Clock * MulFactor) / DivFactor;
+    } else {
+	mode->Clock		= (scrp->clock[clockIndex] * DivFactor) / MulFactor;
+	mode->ClockIndex	= clockIndex;
+	mode->SynthClock	= scrp->clock[clockIndex];
+	if (extraFlags & V_CLKDIV2) {
+	    mode->Clock /= 2;
+	    mode->SynthClock /= 2;
+	}
+    }
+    mode->PrivFlags		= ModePrivFlags;
+
+    return MODE_OK;
+}
+
+static int 
+inferVirtualSize(ScrnInfoPtr scrp, DisplayModePtr modes, int *vx, int *vy)
+{
+    float aspect = 0.0;
+    MonPtr mon = scrp->monitor;
+    xf86MonPtr DDC;
+    int x = 0, y = 0;
+    DisplayModePtr mode;
+
+    if (!mon) return 0;
+    DDC = mon->DDC;
+
+    if (DDC && DDC->ver.revision >= 4) {
+	/* For 1.4, we might actually get native pixel format.  How novel. */
+	if (PREFERRED_TIMING_MODE(DDC->features.msc)) {
+		for (mode = modes; mode; mode = mode->next) {
+		    if (mode->type & (M_T_DRIVER | M_T_PREFERRED)) {
+			x = mode->HDisplay;
+			y = mode->VDisplay;
+			goto found;
+		    }
+		}
+	}
+	/*
+	 * Even if we don't, we might get aspect ratio from extra CVT info
+	 * or from the monitor size fields.  TODO.
+	 */
+    }
+
+    /*
+     * Technically this triggers if either is zero.  That wasn't legal
+     * before EDID 1.4, but right now we'll get that wrong. TODO.
+     */
+    if (!aspect) {
+	if (!mon->widthmm || !mon->heightmm)
+	    aspect = 4.0/3.0;
+	else
+	    aspect = (float)mon->widthmm / (float)mon->heightmm;
+    }
+
+    /* find the largest M_T_DRIVER mode with that aspect ratio */
+    for (mode = modes; mode; mode = mode->next) {
+	float mode_aspect, metaspect;
+	if (!(mode->type & (M_T_DRIVER|M_T_USERDEF)))
+	    continue;
+	mode_aspect = (float)mode->HDisplay / (float)mode->VDisplay;
+	metaspect = aspect / mode_aspect;
+	/* 5% slop or so, since we only get size in centimeters */
+	if (fabs(1.0 - metaspect) < 0.05) {
+	    if ((mode->HDisplay > x) && (mode->VDisplay > y)) {
+		x = mode->HDisplay;
+		y = mode->VDisplay;
+	    }
+	}
+    }
+
+    if (!x || !y) {
+	xf86DrvMsg(scrp->scrnIndex, X_WARNING,
+		   "Unable to estimate virtual size\n");
+	return 0;
+    }
+
+found:
+    *vx = x;
+    *vy = y;
+
+    xf86DrvMsg(scrp->scrnIndex, X_INFO,
+	       "Estimated virtual size for aspect ratio %.4f is %dx%d\n",
+	       aspect, *vx, *vy);
+
+    return 1;
+}
+
+/* Least common multiple */
+static unsigned int
+LCM(unsigned int x, unsigned int y)
+{
+    unsigned int m = x, n = y, o;
+
+    while ((o = m % n))
+    {
+        m = n;
+        n = o;
+    }
+
+    return (x / n) * y;
+}
+
+/*
+ * Given various screen attributes, determine the minimum scanline width such
+ * that each scanline is server and DDX padded and any pixels with imbedded
+ * bank boundaries are off-screen.  This function returns -1 if such a width
+ * cannot exist.
+ */
+static int
+scanLineWidth(
+    unsigned int     xsize,         /* pixels */
+    unsigned int     ysize,         /* pixels */
+    unsigned int     width,         /* pixels */
+    unsigned long    BankSize,      /* char's */
+    PixmapFormatRec *pBankFormat,
+    unsigned int     nWidthUnit     /* bits */
+)
+{
+    unsigned long nBitsPerBank, nBitsPerScanline, nBitsPerScanlinePadUnit;
+    unsigned long minBitsPerScanline, maxBitsPerScanline;
+
+    /* Sanity checks */
+
+    if (!nWidthUnit || !pBankFormat)
+        return -1;
+
+    nBitsPerBank = BankSize * 8;
+    if (nBitsPerBank % pBankFormat->scanlinePad)
+        return -1;
+
+    if (xsize > width)
+        width = xsize;
+    nBitsPerScanlinePadUnit = LCM(pBankFormat->scanlinePad, nWidthUnit);
+    nBitsPerScanline =
+        (((width * pBankFormat->bitsPerPixel) + nBitsPerScanlinePadUnit - 1) /
+         nBitsPerScanlinePadUnit) * nBitsPerScanlinePadUnit;
+    width = nBitsPerScanline / pBankFormat->bitsPerPixel;
+
+    if (!xsize || !(nBitsPerBank % pBankFormat->bitsPerPixel))
+        return (int)width;
+
+    /*
+     * Scanlines will be server-pad aligned at this point.  They will also be
+     * a multiple of nWidthUnit bits long.  Ensure that pixels with imbedded
+     * bank boundaries are off-screen.
+     *
+     * It seems reasonable to limit total frame buffer size to 1/16 of the
+     * theoretical maximum address space size.  On a machine with 32-bit
+     * addresses (to 8-bit quantities) this turns out to be 256MB.  Not only
+     * does this provide a simple limiting condition for the loops below, but
+     * it also prevents unsigned long wraparounds.
+     */
+    if (!ysize)
+        return -1;
+
+    minBitsPerScanline = xsize * pBankFormat->bitsPerPixel;
+    if (minBitsPerScanline > nBitsPerBank)
+        return -1;
+
+    if (ysize == 1)
+        return (int)width;
+
+    maxBitsPerScanline =
+        (((unsigned long)(-1) >> 1) - minBitsPerScanline) / (ysize - 1);
+    while (nBitsPerScanline <= maxBitsPerScanline)
+    {
+        unsigned long BankBase, BankUnit;
+
+        BankUnit = ((nBitsPerBank + nBitsPerScanline - 1) / nBitsPerBank) *
+            nBitsPerBank;
+        if (!(BankUnit % nBitsPerScanline))
+            return (int)width;
+
+        for (BankBase = BankUnit;  ;  BankBase += nBitsPerBank)
+        {
+            unsigned long x, y;
+
+            y = BankBase / nBitsPerScanline;
+            if (y >= ysize)
+                return (int)width;
+
+            x = BankBase % nBitsPerScanline;
+            if (!(x % pBankFormat->bitsPerPixel))
+                continue;
+
+            if (x < minBitsPerScanline)
+            {
+                /*
+                 * Skip ahead certain widths by dividing the excess scanline
+                 * amongst the y's.
+                 */
+                y *= nBitsPerScanlinePadUnit;
+                nBitsPerScanline +=
+                    ((x + y - 1) / y) * nBitsPerScanlinePadUnit;
+                width = nBitsPerScanline / pBankFormat->bitsPerPixel;
+                break;
+            }
+
+            if (BankBase != BankUnit)
+                continue;
+
+            if (!(nBitsPerScanline % x))
+                return (int)width;
+
+            BankBase = ((nBitsPerScanline - minBitsPerScanline) /
+                (nBitsPerScanline - x)) * BankUnit;
+        }
+    }
+
+    return -1;
+}
+
+/*
+ * xf86ValidateModes
+ *
+ * This function takes a set of mode names, modes and limiting conditions,
+ * and selects a set of modes and parameters based on those conditions.
+ *
+ * This function takes the following parameters:
+ *    scrp         ScrnInfoPtr
+ *    availModes   the list of modes available for the monitor
+ *    modeNames    (optional) list of mode names that the screen is requesting
+ *    clockRanges  a list of clock ranges
+ *    linePitches  (optional) a list of line pitches
+ *    minPitch     (optional) minimum line pitch (in pixels)
+ *    maxPitch     (optional) maximum line pitch (in pixels)
+ *    pitchInc     (mandatory) pitch increment (in bits)
+ *    minHeight    (optional) minimum virtual height (in pixels)
+ *    maxHeight    (optional) maximum virtual height (in pixels)
+ *    virtualX     (optional) virtual width requested (in pixels)
+ *    virtualY     (optional) virtual height requested (in pixels)
+ *    apertureSize size of video aperture (in bytes)
+ *    strategy     how to decide which mode to use from multiple modes with
+ *                 the same name
+ *
+ * In addition, the following fields from the ScrnInfoRec are used:
+ *    clocks       a list of discrete clocks
+ *    numClocks    number of discrete clocks
+ *    progClock    clock is programmable
+ *    monitor      pointer to structure for monitor section
+ *    fbFormat     format of the framebuffer
+ *    videoRam     video memory size
+ *    maxHValue    maximum horizontal timing value
+ *    maxVValue    maximum vertical timing value
+ *    xInc         horizontal timing increment (defaults to 8 pixels)
+ *
+ * The function fills in the following ScrnInfoRec fields:
+ *    modePool     A subset of the modes available to the monitor which
+ *		   are compatible with the driver.
+ *    modes        one mode entry for each of the requested modes, with the
+ *                 status field filled in to indicate if the mode has been
+ *                 accepted or not.
+ *    virtualX     the resulting virtual width
+ *    virtualY     the resulting virtual height
+ *    displayWidth the resulting line pitch
+ *
+ * The function's return value is the number of matching modes found, or -1
+ * if an unrecoverable error was encountered.
+ */
+
+int
+xf86ValidateModes(ScrnInfoPtr scrp, DisplayModePtr availModes,
+		  char **modeNames, ClockRangePtr clockRanges,
+		  int *linePitches, int minPitch, int maxPitch, int pitchInc,
+		  int minHeight, int maxHeight, int virtualX, int virtualY,
+		  int apertureSize, LookupModeFlags strategy)
+{
+    DisplayModePtr p, q, r, new, last, *endp;
+    int i, numModes = 0;
+    ModeStatus status;
+    int linePitch = -1, virtX = 0, virtY = 0;
+    int newLinePitch, newVirtX, newVirtY;
+    int modeSize;					/* in pixels */
+    Bool validateAllDefaultModes = FALSE;
+    Bool userModes = FALSE;
+    int saveType;
+    PixmapFormatRec *BankFormat;
+    ClockRangePtr cp;
+    ClockRangePtr storeClockRanges;
+    int numTimings = 0;
+    range hsync[MAX_HSYNC];
+    range vrefresh[MAX_VREFRESH];
+    Bool inferred_virtual = FALSE;
+
+    DebugF("xf86ValidateModes(%p, %p, %p, %p,\n\t\t  %p, %d, %d, %d, %d, %d, %d, %d, %d, 0x%x)\n",
+	   scrp, availModes, modeNames, clockRanges,
+	   linePitches, minPitch, maxPitch, pitchInc,
+	   minHeight, maxHeight, virtualX, virtualY,
+	   apertureSize, strategy
+	   );
+
+    /* Some sanity checking */
+    if (scrp == NULL || scrp->name == NULL || !scrp->monitor ||
+	(!scrp->progClock && scrp->numClocks == 0)) {
+	ErrorF("xf86ValidateModes: called with invalid scrnInfoRec\n");
+	return -1;
+    }
+    if (linePitches != NULL && linePitches[0] <= 0) {
+	ErrorF("xf86ValidateModes: called with invalid linePitches\n");
+	return -1;
+    }
+    if (pitchInc <= 0) {
+	ErrorF("xf86ValidateModes: called with invalid pitchInc\n");
+	return -1;
+    }
+    if ((virtualX > 0) != (virtualY > 0)) {
+	ErrorF("xf86ValidateModes: called with invalid virtual resolution\n");
+	return -1;
+    }
+
+    /*
+     * If requested by the driver, allow missing hsync and/or vrefresh ranges
+     * in the monitor section.
+     */
+    if (strategy & LOOKUP_OPTIONAL_TOLERANCES) {
+	strategy &= ~LOOKUP_OPTIONAL_TOLERANCES;
+    } else {
+	const char *type = "";
+        Bool specified = FALSE;
+
+	if (scrp->monitor->nHsync <= 0) {
+	    if (numTimings > 0) {
+		scrp->monitor->nHsync = numTimings;
+		for (i = 0; i < numTimings; i++) {
+		    scrp->monitor->hsync[i].lo = hsync[i].lo;
+		    scrp->monitor->hsync[i].hi = hsync[i].hi;
+		}
+	    } else {
+		scrp->monitor->hsync[0].lo = 31.5;
+		scrp->monitor->hsync[0].hi = 48.0;
+		scrp->monitor->nHsync = 1;
+	    }
+	    type = "default ";
+	} else {
+            specified = TRUE;
+        }
+	for (i = 0; i < scrp->monitor->nHsync; i++) {
+	    if (scrp->monitor->hsync[i].lo == scrp->monitor->hsync[i].hi)
+	      xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			 "%s: Using %shsync value of %.2f kHz\n",
+			 scrp->monitor->id, type,
+			 scrp->monitor->hsync[i].lo);
+	    else
+	      xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			 "%s: Using %shsync range of %.2f-%.2f kHz\n",
+			 scrp->monitor->id, type,
+			 scrp->monitor->hsync[i].lo,
+			 scrp->monitor->hsync[i].hi);
+	}
+
+	type = "";
+	if (scrp->monitor->nVrefresh <= 0) {
+	    if (numTimings > 0) {
+		scrp->monitor->nVrefresh = numTimings;
+		for (i = 0; i < numTimings; i++) {
+		    scrp->monitor->vrefresh[i].lo = vrefresh[i].lo;
+		    scrp->monitor->vrefresh[i].hi = vrefresh[i].hi;
+		}
+	    } else {
+		scrp->monitor->vrefresh[0].lo = 50;
+		scrp->monitor->vrefresh[0].hi = 70;
+		scrp->monitor->nVrefresh = 1;
+	    }
+	    type = "default ";
+	} else {
+            specified = TRUE;
+        }
+	for (i = 0; i < scrp->monitor->nVrefresh; i++) {
+	    if (scrp->monitor->vrefresh[i].lo == scrp->monitor->vrefresh[i].hi)
+	      xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			 "%s: Using %svrefresh value of %.2f Hz\n",
+			 scrp->monitor->id, type,
+			 scrp->monitor->vrefresh[i].lo);
+	    else
+	      xf86DrvMsg(scrp->scrnIndex, X_INFO,
+			 "%s: Using %svrefresh range of %.2f-%.2f Hz\n",
+			 scrp->monitor->id, type,
+			 scrp->monitor->vrefresh[i].lo,
+			 scrp->monitor->vrefresh[i].hi);
+	}
+
+        type = "";
+	if (!scrp->monitor->maxPixClock && !specified) {
+            type = "default ";
+            scrp->monitor->maxPixClock = 65000.0;
+        }
+	if (scrp->monitor->maxPixClock) {
+	    xf86DrvMsg(scrp->scrnIndex, X_INFO,
+		       "%s: Using %smaximum pixel clock of %.2f MHz\n",
+		       scrp->monitor->id, type,
+		       (float)scrp->monitor->maxPixClock / 1000.0);
+	}
+    }
+
+    /*
+     * Store the clockRanges for later use by the VidMode extension.
+     */
+    storeClockRanges = scrp->clockRanges;
+    while (storeClockRanges != NULL) {
+	storeClockRanges = storeClockRanges->next;
+    }
+    for (cp = clockRanges; cp != NULL; cp = cp->next,
+	   	storeClockRanges = storeClockRanges->next) {
+	storeClockRanges = xnfalloc(sizeof(ClockRange));
+	if (scrp->clockRanges == NULL)
+	    scrp->clockRanges = storeClockRanges;
+	memcpy(storeClockRanges, cp, sizeof(ClockRange));
+    }
+
+    /* Determine which pixmap format to pass to scanLineWidth() */
+    if (scrp->depth > 4)
+	BankFormat = &scrp->fbFormat;
+    else
+	BankFormat = xf86GetPixFormat(scrp, 1);	/* >not< scrp->depth! */
+
+    if (scrp->xInc <= 0)
+        scrp->xInc = 8;		/* Suitable for VGA and others */
+
+#define _VIRTUALX(x) ((((x) + scrp->xInc - 1) / scrp->xInc) * scrp->xInc)
+
+    /*
+     * Determine maxPitch if it wasn't given explicitly.  Note linePitches
+     * always takes precedence if is non-NULL.  In that case the minPitch and
+     * maxPitch values passed are ignored.
+     */
+    if (linePitches) {
+	minPitch = maxPitch = linePitches[0];
+	for (i = 1; linePitches[i] > 0; i++) {
+	    if (linePitches[i] > maxPitch)
+		maxPitch = linePitches[i];
+	    if (linePitches[i] < minPitch)
+		minPitch = linePitches[i];
+	}
+    }
+
+    /* Initial check of virtual size against other constraints */
+    scrp->virtualFrom = X_PROBED;
+    /*
+     * Initialise virtX and virtY if the values are fixed.
+     */
+    if (virtualY > 0) {
+	if (maxHeight > 0 && virtualY > maxHeight) {
+	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,
+		       "Virtual height (%d) is too large for the hardware "
+		       "(max %d)\n", virtualY, maxHeight);
+	    return -1;
+	}
+
+	if (minHeight > 0 && virtualY < minHeight) {
+	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,
+		       "Virtual height (%d) is too small for the hardware "
+		       "(min %d)\n", virtualY, minHeight);
+	    return -1;
+	}
+
+	virtualX = _VIRTUALX(virtualX);
+	if (linePitches != NULL) {
+	    for (i = 0; linePitches[i] != 0; i++) {
+		if ((linePitches[i] >= virtualX) &&
+		    (linePitches[i] ==
+		     scanLineWidth(virtualX, virtualY, linePitches[i],
+				   apertureSize, BankFormat, pitchInc))) {
+		    linePitch = linePitches[i];
+		    break;
+		}
+	    }
+	} else {
+	    linePitch = scanLineWidth(virtualX, virtualY, minPitch,
+				      apertureSize, BankFormat, pitchInc);
+	}
+
+	if ((linePitch < minPitch) || (linePitch > maxPitch)) {
+	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,
+		       "Virtual width (%d) is too large for the hardware "
+		       "(max %d)\n", virtualX, maxPitch);
+	    return -1;
+	}
+
+	if (!xf86CheckModeSize(scrp, linePitch, virtualX, virtualY)) {
+	    xf86DrvMsg(scrp->scrnIndex, X_ERROR,
+		      "Virtual size (%dx%d) (pitch %d) exceeds video memory\n",
+		      virtualX, virtualY, linePitch);
+	    return -1;
+	}
+
+	virtX = virtualX;
+	virtY = virtualY;
+	scrp->virtualFrom = X_CONFIG;
+    } else if (!modeNames || !*modeNames) {
+	/* No virtual size given in the config, try to infer */
+	/* XXX this doesn't take m{in,ax}Pitch into account; oh well */
+	inferred_virtual = inferVirtualSize(scrp, availModes, &virtX, &virtY);
+	if (inferred_virtual)
+	    linePitch = scanLineWidth(virtX, virtY, minPitch, apertureSize,
+				      BankFormat, pitchInc);
+    }
+
+    /* Print clock ranges and scaled clocks */
+    xf86ShowClockRanges(scrp, clockRanges);
+
+    /*
+     * If scrp->modePool hasn't been setup yet, set it up now.  This allows the
+     * modes that the driver definitely can't use to be weeded out early.  Note
+     * that a modePool mode's prev field is used to hold a pointer to the
+     * member of the scrp->modes list for which a match was considered.
+     */
+    if (scrp->modePool == NULL) {
+	q = NULL;
+	for (p = availModes; p != NULL; p = p->next) {
+	    status = xf86InitialCheckModeForDriver(scrp, p, clockRanges,
+						   strategy, maxPitch,
+						   virtX, virtY);
+
+	    if (status == MODE_OK) {
+		status = xf86CheckModeForMonitor(p, scrp->monitor);
+	    }
+	    
+	    if (status == MODE_OK) {
+		new = xnfalloc(sizeof(DisplayModeRec));
+		*new = *p;
+		new->next = NULL;
+		if (!q) {
+		    scrp->modePool = new;
+		} else {
+		    q->next = new;
+		}
+		new->prev = NULL;
+		q = new;
+		q->name = xnfstrdup(p->name);
+	        q->status = MODE_OK;
+	    } else {
+		printModeRejectMessage(scrp->scrnIndex, p, status);
+	    }
+	}
+
+	if (scrp->modePool == NULL) {
+	    xf86DrvMsg(scrp->scrnIndex, X_WARNING, "Mode pool is empty\n");
+	    return 0;
+	}
+    } else {
+	for (p = scrp->modePool; p != NULL; p = p->next) {
+	    p->prev = NULL;
+	    p->status = MODE_OK;
+	}
+    }
+
+    /*
+     * Allocate one entry in scrp->modes for each named mode.
+     */
+    while (scrp->modes)
+	xf86DeleteMode(&scrp->modes, scrp->modes);
+    endp = &scrp->modes;
+    last = NULL;
+    if (modeNames != NULL) {
+	for (i = 0; modeNames[i] != NULL; i++) {
+	    userModes = TRUE;
+	    new = xnfcalloc(1, sizeof(DisplayModeRec));
+	    new->prev = last;
+	    new->type = M_T_USERDEF;
+	    new->name = xnfstrdup(modeNames[i]);
+	    if (new->prev)
+		new->prev->next = new;
+	    *endp = last = new;
+	    endp = &new->next;
+	}
+    }
+
+    /* Lookup each mode */
+#ifdef RANDR
+    if (!xf86Info.disableRandR	
+#ifdef PANORAMIX
+	&& noPanoramiXExtension
+#endif
+	)
+	validateAllDefaultModes = TRUE;
+#endif
+
+    for (p = scrp->modes; ; p = p->next) {
+	Bool repeat;
+
+	/*
+	 * If the supplied mode names don't produce a valid mode, scan through
+	 * unconsidered modePool members until one survives validation.  This
+	 * is done in decreasing order by mode pixel area.
+	 */
+
+	if (p == NULL) {
+	    if ((numModes > 0) && !validateAllDefaultModes)
+		break;
+
+	    validateAllDefaultModes = TRUE;
+	    r = NULL;
+	    modeSize = 0;
+	    for (q = scrp->modePool;  q != NULL;  q = q->next) {
+		if ((q->prev == NULL) && (q->status == MODE_OK)) {
+		    /*
+		     * Deal with the case where this mode wasn't considered
+		     * because of a builtin mode of the same name.
+		     */
+		    for (p = scrp->modes; p != NULL; p = p->next) {
+			if ((p->status != MODE_OK) &&
+			    !strcmp(p->name, q->name))
+			    break;
+		    }
+
+		    if (p != NULL)
+			q->prev = p;
+		    else {
+			/*
+			 * A quick check to not allow default modes with
+			 * horizontal timing parameters that CRTs may have
+			 * problems with.
+			 */
+			if (!scrp->monitor->reducedblanking &&
+			    (q->type & M_T_DEFAULT) &&
+			    ((double)q->HTotal / (double)q->HDisplay) < 1.15)
+			    continue;
+
+			if (modeSize < (q->HDisplay * q->VDisplay)) {
+			    r = q;
+			    modeSize = q->HDisplay * q->VDisplay;
+			}
+		    }
+		}
+	    }
+
+	    if (r == NULL)
+		break;
+
+	    p = xnfcalloc(1, sizeof(DisplayModeRec));
+	    p->prev = last;
+	    p->name = xnfstrdup(r->name);
+	    if (!userModes)
+		p->type = M_T_USERDEF;
+	    if (p->prev)
+		p->prev->next = p;
+	    *endp = last = p;
+	    endp = &p->next;
+	}
+
+	repeat = FALSE;
+    lookupNext:
+	if (repeat && ((status = p->status) != MODE_OK))
+	    printModeRejectMessage(scrp->scrnIndex, p, status);
+	saveType = p->type;
+	status = xf86LookupMode(scrp, p, clockRanges, strategy);
+	if (repeat && status == MODE_NOMODE)
+	    continue;
+	if (status != MODE_OK)
+	    printModeRejectMessage(scrp->scrnIndex, p, status);
+	if (status == MODE_ERROR) {
+	    ErrorF("xf86ValidateModes: "
+		   "unexpected result from xf86LookupMode()\n");
+	    return -1;
+	}
+	if (status != MODE_OK) {
+	    if (p->status == MODE_OK)
+		p->status = status;
+	    continue;
+	}
+	p->type |= saveType;
+	repeat = TRUE;
+
+	newLinePitch = linePitch;
+	newVirtX = virtX;
+	newVirtY = virtY;
+
+	/*
+	 * Don't let non-user defined modes increase the virtual size
+	 */
+	if (!(p->type & M_T_USERDEF) && (numModes > 0)) {
+	    if (p->HDisplay > virtX) {
+		p->status = MODE_VIRTUAL_X;
+		goto lookupNext;
+	    }
+	    if (p->VDisplay > virtY) {
+		p->status = MODE_VIRTUAL_Y;
+		goto lookupNext;
+	    }
+	}
+	/*
+	 * Adjust virtual width and height if the mode is too large for the
+	 * current values and if they are not fixed.
+	 */
+	if (virtualX <= 0 && p->HDisplay > newVirtX)
+	    newVirtX = _VIRTUALX(p->HDisplay);
+	if (virtualY <= 0 && p->VDisplay > newVirtY) {
+	    if (maxHeight > 0 && p->VDisplay > maxHeight) {
+		p->status = MODE_VIRTUAL_Y;	/* ? */
+		goto lookupNext;
+	    }
+	    newVirtY = p->VDisplay;
+	}
+
+	/*
+	 * If virtual resolution is to be increased, revalidate it.
+	 */
+	if ((virtX != newVirtX) || (virtY != newVirtY)) {
+	    if (linePitches != NULL) {
+		newLinePitch = -1;
+		for (i = 0; linePitches[i] != 0; i++) {
+		    if ((linePitches[i] >= newVirtX) &&
+			(linePitches[i] >= linePitch) &&
+			(linePitches[i] ==
+			 scanLineWidth(newVirtX, newVirtY, linePitches[i],
+				       apertureSize, BankFormat, pitchInc))) {
+			newLinePitch = linePitches[i];
+			break;
+		    }
+		}
+	    } else {
+		if (linePitch < minPitch)
+		    linePitch = minPitch;
+		newLinePitch = scanLineWidth(newVirtX, newVirtY, linePitch,
+					     apertureSize, BankFormat,
+					     pitchInc);
+	    }
+	    if ((newLinePitch < minPitch) || (newLinePitch > maxPitch)) {
+		p->status = MODE_BAD_WIDTH;
+		goto lookupNext;
+	    }
+
+	    /*
+	     * Check that the pixel area required by the new virtual height
+	     * and line pitch isn't too large.
+	     */
+	    if (!xf86CheckModeSize(scrp, newLinePitch, newVirtX, newVirtY)) {
+		p->status = MODE_MEM_VIRT;
+		goto lookupNext;
+	    }
+	}
+
+	if (scrp->ValidMode) {
+	    /*
+	     * Give the driver a final say, passing it the proposed virtual
+	     * geometry.
+	     */
+	    scrp->virtualX = newVirtX;
+	    scrp->virtualY = newVirtY;
+	    scrp->displayWidth = newLinePitch;
+	    p->status = (scrp->ValidMode)(scrp->scrnIndex, p, FALSE,
+					  MODECHECK_FINAL);
+
+	    if (p->status != MODE_OK) {
+	        goto lookupNext;
+	    }
+	}
+
+	/* Mode has passed all the tests */
+	virtX = newVirtX;
+	virtY = newVirtY;
+	linePitch = newLinePitch;
+	p->status = MODE_OK;
+	numModes++;
+    }
+
+    /*
+     * If we estimated the virtual size above, we may have filtered away all
+     * the modes that maximally match that size; scan again to find out and
+     * fix up if so.
+     */
+    if (inferred_virtual) {
+	int vx = 0, vy = 0;
+	for (p = scrp->modes; p; p = p->next) {
+	    if (p->HDisplay > vx && p->VDisplay > vy) {
+		vx = p->HDisplay;
+		vy = p->VDisplay;
+	    }
+	}
+	if (vx < virtX || vy < virtY) {
+	    const int types[] = {
+		M_T_BUILTIN | M_T_PREFERRED,
+		M_T_BUILTIN,
+		M_T_DRIVER | M_T_PREFERRED,
+		M_T_DRIVER,
+		0
+	    };
+	    const int ntypes = sizeof(types) / sizeof(int);
+	    int n;
+
+	    /* 
+	     * We did not find the estimated virtual size. So now we want to 
+	     * find the largest mode available, but we want to search in the
+	     * modes in the order of "types" listed above.
+	     */
+	    for (n = 0; n < ntypes; n++) {
+		int type = types[n];
+
+		vx = 0; vy = 0;
+		for (p = scrp->modes; p; p = p->next) {
+		    /* scan through the modes in the sort order above */
+		    if ((p->type & type) != type)
+			continue;
+		    if (p->HDisplay > vx && p->VDisplay > vy) {
+			vx = p->HDisplay;
+			vy = p->VDisplay;
+		    }
+		}
+		if (vx && vy)
+		    /* Found one */
+		    break;
+	    }
+	    xf86DrvMsg(scrp->scrnIndex, X_WARNING,
+		       "Shrinking virtual size estimate from %dx%d to %dx%d\n",
+		       virtX, virtY, vx, vy);
+	    virtX = _VIRTUALX(vx);
+	    virtY = vy;
+	    for (p = scrp->modes; p; p = p->next) {
+		if (numModes > 0) {
+		    if (p->HDisplay > virtX)
+			p->status = MODE_VIRTUAL_X;
+		    if (p->VDisplay > virtY)
+			p->status = MODE_VIRTUAL_Y;
+		    if (p->status != MODE_OK) {
+			numModes--;
+			printModeRejectMessage(scrp->scrnIndex, p, p->status);
+		    }
+		}
+	    }
+	    if (linePitches != NULL) {
+		for (i = 0; linePitches[i] != 0; i++) {
+		    if ((linePitches[i] >= virtX) &&
+			(linePitches[i] ==
+			scanLineWidth(virtX, virtY, linePitches[i],
+				      apertureSize, BankFormat, pitchInc))) {
+			linePitch = linePitches[i];
+			break;
+		    }
+		}
+	    } else {
+		linePitch = scanLineWidth(virtX, virtY, minPitch,
+					  apertureSize, BankFormat, pitchInc);
+	    }
+	}
+    }
+
+    /* Update the ScrnInfoRec parameters */
+    
+    scrp->virtualX = virtX;
+    scrp->virtualY = virtY;
+    scrp->displayWidth = linePitch;
+
+    if (numModes <= 0)
+	return 0;
+    
+    /* Make the mode list into a circular list by joining up the ends */
+    p = scrp->modes;
+    while (p->next != NULL)
+	p = p->next;
+    /* p is now the last mode on the list */
+    p->next = scrp->modes;
+    scrp->modes->prev = p;
+
+    if (minHeight > 0 && virtY < minHeight) {
+	xf86DrvMsg(scrp->scrnIndex, X_ERROR,
+		   "Virtual height (%d) is too small for the hardware "
+		   "(min %d)\n", virtY, minHeight);
+	return -1;
+    }
+
+    return numModes;
+}
+
+/*
+ * xf86DeleteMode
+ *
+ * This function removes a mode from a list of modes.
+ *
+ * There are different types of mode lists:
+ *
+ *  - singly linked linear lists, ending in NULL
+ *  - doubly linked linear lists, starting and ending in NULL
+ *  - doubly linked circular lists
+ *
+ */
+ 
+void
+xf86DeleteMode(DisplayModePtr *modeList, DisplayModePtr mode)
+{
+    /* Catch the easy/insane cases */
+    if (modeList == NULL || *modeList == NULL || mode == NULL)
+	return;
+
+    /* If the mode is at the start of the list, move the start of the list */
+    if (*modeList == mode)
+	*modeList = mode->next;
+
+    /* If mode is the only one on the list, set the list to NULL */
+    if ((mode == mode->prev) && (mode == mode->next)) {
+	*modeList = NULL;
+    } else {
+	if ((mode->prev != NULL) && (mode->prev->next == mode))
+	    mode->prev->next = mode->next;
+	if ((mode->next != NULL) && (mode->next->prev == mode))
+	    mode->next->prev = mode->prev;
+    }
+
+    free(mode->name);
+    free(mode);
+}
+
+/*
+ * xf86PruneDriverModes
+ *
+ * Remove modes from the driver's mode list which have been marked as
+ * invalid.
+ */
+
+void
+xf86PruneDriverModes(ScrnInfoPtr scrp)
+{
+    DisplayModePtr first, p, n;
+
+    p = scrp->modes;
+    if (p == NULL)
+	return;
+
+    do {
+	if (!(first = scrp->modes))
+	    return;
+	n = p->next;
+	if (p->status != MODE_OK) {
+	    xf86DeleteMode(&(scrp->modes), p);
+	}
+	p = n;
+    } while (p != NULL && p != first);
+
+    /* modePool is no longer needed, turf it */
+    while (scrp->modePool) {
+	/*
+	 * A modePool mode's prev field is used to hold a pointer to the
+	 * member of the scrp->modes list for which a match was considered.
+	 * Clear that pointer first, otherwise xf86DeleteMode might get 
+	 * confused 
+	 */
+	scrp->modePool->prev = NULL;
+	xf86DeleteMode(&scrp->modePool, scrp->modePool);
+    }
+}
+
+
+/*
+ * xf86SetCrtcForModes
+ *
+ * Goes through the screen's mode list, and initialises the Crtc
+ * parameters for each mode.  The initialisation includes adjustments
+ * for interlaced and double scan modes.
+ */
+void
+xf86SetCrtcForModes(ScrnInfoPtr scrp, int adjustFlags)
+{
+    DisplayModePtr p;
+
+    /*
+     * Store adjustFlags for use with the VidMode extension. There is an
+     * implicit assumption here that SetCrtcForModes is called once.
+     */
+    scrp->adjustFlags = adjustFlags;
+
+    p = scrp->modes;
+    if (p == NULL)
+	return;
+
+    do {
+	xf86SetModeCrtc(p, adjustFlags);
+	DebugF("%sMode %s: %d (%d) %d %d (%d) %d %d (%d) %d %d (%d) %d\n",
+	       (p->type & M_T_DEFAULT) ? "Default " : "",
+	       p->name, p->CrtcHDisplay, p->CrtcHBlankStart,
+	       p->CrtcHSyncStart, p->CrtcHSyncEnd, p->CrtcHBlankEnd,
+	       p->CrtcHTotal, p->CrtcVDisplay, p->CrtcVBlankStart,
+	       p->CrtcVSyncStart, p->CrtcVSyncEnd, p->CrtcVBlankEnd,
+	       p->CrtcVTotal);
+	p = p->next;
+    } while (p != NULL && p != scrp->modes);
+}
+
+void
+xf86PrintModes(ScrnInfoPtr scrp)
+{
+    DisplayModePtr p;
+    float hsync, refresh = 0;
+    const char *desc, *desc2, *prefix, *uprefix;
+
+    if (scrp == NULL)
+	return;
+
+    xf86DrvMsg(scrp->scrnIndex, scrp->virtualFrom, "Virtual size is %dx%d "
+	       "(pitch %d)\n", scrp->virtualX, scrp->virtualY,
+	       scrp->displayWidth);
+    
+    p = scrp->modes;
+    if (p == NULL)
+	return;
+
+    do {
+	desc = desc2 = "";
+	hsync = xf86ModeHSync(p);
+	refresh = xf86ModeVRefresh(p);
+	if (p->Flags & V_INTERLACE) {
+	    desc = " (I)";
+	}
+	if (p->Flags & V_DBLSCAN) {
+	    desc = " (D)";
+	}
+	if (p->VScan > 1) {
+	    desc2 = " (VScan)";
+	}
+	if (p->type & M_T_BUILTIN)
+	    prefix = "Built-in mode";
+	else if (p->type & M_T_DEFAULT)
+	    prefix = "Default mode";
+	else if (p->type & M_T_DRIVER)
+	    prefix = "Driver mode";
+	else
+	    prefix = "Mode";
+	if (p->type & M_T_USERDEF)
+	    uprefix = "*";
+	else
+	    uprefix = " ";
+	if (hsync == 0 || refresh == 0) {
+	    if (p->name)
+		xf86DrvMsg(scrp->scrnIndex, X_CONFIG,
+			   "%s%s \"%s\"\n", uprefix, prefix, p->name);
+	    else
+		xf86DrvMsg(scrp->scrnIndex, X_PROBED,
+			   "%s%s %dx%d (unnamed)\n",
+			   uprefix, prefix, p->HDisplay, p->VDisplay);
+	} else if (p->Clock == p->SynthClock) {
+	    xf86DrvMsg(scrp->scrnIndex, X_CONFIG,
+			"%s%s \"%s\": %.1f MHz, %.1f kHz, %.1f Hz%s%s\n",
+			uprefix, prefix, p->name, p->Clock / 1000.0,
+			hsync, refresh, desc, desc2);
+	} else {
+	    xf86DrvMsg(scrp->scrnIndex, X_CONFIG,
+			"%s%s \"%s\": %.1f MHz (scaled from %.1f MHz), "
+			"%.1f kHz, %.1f Hz%s%s\n",
+			uprefix, prefix, p->name, p->Clock / 1000.0,
+			p->SynthClock / 1000.0, hsync, refresh, desc, desc2);
+	}
+	if (hsync != 0 && refresh != 0)
+	    xf86PrintModeline(scrp->scrnIndex,p);
+	p = p->next;
+    } while (p != NULL && p != scrp->modes);
+}