xserver git update 15/5/2010

1 files changed, 2067 insertions, 2067 deletions

diff --git a/xorg-server/hw/xfree86/common/xf86Mode.c b/xorg-server/hw/xfree86/common/xf86Mode.c
index 5d30a782c..af738e703 100644
--- a/xorg-server/hw/xfree86/common/xf86Mode.c
+++ b/xorg-server/hw/xfree86/common/xf86Mode.c
@@ -1,2067 +1,2067 @@
-/*
- * 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 = "";
-
-	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 = 37.9;
-		scrp->monitor->nHsync = 1;
-	    }
-	    type = "default ";
-	}
-	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 ";
-	}
-	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);
-	}
-	if (scrp->monitor->maxPixClock) {
-	    xf86DrvMsg(scrp->scrnIndex, X_INFO,
-		       "%s: Using maximum pixel clock of %.2f MHz\n",
-		       scrp->monitor->id,
-		       (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 = xnfalloc(strlen(modeNames[i]) + 1);
-	    strcpy(new->name, 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 = xnfalloc(strlen(r->name) + 1);
-	    if (!userModes)
-		p->type = M_T_USERDEF;
-	    strcpy(p->name, r->name);
-	    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++;
-    }
-
-#undef _VIRTUALX
-
-    /*
-     * 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) {
-	    xf86DrvMsg(scrp->scrnIndex, X_WARNING,
-		       "Shrinking virtual size estimate from %dx%d to %dx%d\n",
-		       virtX, virtY, vx, vy);
-	    virtX = vx;
-	    virtY = vy;
-	    linePitch = scanLineWidth(vx, vy, 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;
-    }
-
-    xfree(mode->name);
-    xfree(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)

+{

+    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 = "";

+

+	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 = 37.9;

+		scrp->monitor->nHsync = 1;

+	    }

+	    type = "default ";

+	}

+	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 ";

+	}

+	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);

+	}

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

+	    xf86DrvMsg(scrp->scrnIndex, X_INFO,

+		       "%s: Using maximum pixel clock of %.2f MHz\n",

+		       scrp->monitor->id,

+		       (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 = xnfalloc(strlen(modeNames[i]) + 1);

+	    strcpy(new->name, 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 = xnfalloc(strlen(r->name) + 1);

+	    if (!userModes)

+		p->type = M_T_USERDEF;

+	    strcpy(p->name, r->name);

+	    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++;

+    }

+

+#undef _VIRTUALX

+

+    /*

+     * 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) {

+	    xf86DrvMsg(scrp->scrnIndex, X_WARNING,

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

+		       virtX, virtY, vx, vy);

+	    virtX = vx;

+	    virtY = vy;

+	    linePitch = scanLineWidth(vx, vy, 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);

+}