xf86Crtc.c 70.2 KB
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/*
 * Copyright © 2006 Keith Packard
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 * Copyright © 2008 Red Hat, Inc.
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 *
 * 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 the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS 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.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
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#else
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
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#endif

#include <stddef.h>
#include <string.h>
#include <stdio.h>

#include "xf86.h"
#include "xf86DDC.h"
#include "xf86Crtc.h"
#include "xf86Modes.h"
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#include "xf86Priv.h"
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#include "xf86RandR12.h"
#include "X11/extensions/render.h"
#define DPMS_SERVER
#include "X11/extensions/dpms.h"
#include "X11/Xatom.h"
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#ifdef RENDER
#include "picturestr.h"
#endif
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#include "xf86xv.h"

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/*
 * Initialize xf86CrtcConfig structure
 */

int xf86CrtcConfigPrivateIndex = -1;

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_X_EXPORT void
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xf86CrtcConfigInit (ScrnInfoPtr scrn,
		    const xf86CrtcConfigFuncsRec *funcs)
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{
    xf86CrtcConfigPtr	config;
    
    if (xf86CrtcConfigPrivateIndex == -1)
	xf86CrtcConfigPrivateIndex = xf86AllocateScrnInfoPrivateIndex();
    config = xnfcalloc (1, sizeof (xf86CrtcConfigRec));
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    config->funcs = funcs;

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    scrn->privates[xf86CrtcConfigPrivateIndex].ptr = config;
}
 
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_X_EXPORT void
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xf86CrtcSetSizeRange (ScrnInfoPtr scrn,
		      int minWidth, int minHeight,
		      int maxWidth, int maxHeight)
{
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);

    config->minWidth = minWidth;
    config->minHeight = minHeight;
    config->maxWidth = maxWidth;
    config->maxHeight = maxHeight;
}

/*
 * Crtc functions
 */
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_X_EXPORT xf86CrtcPtr
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xf86CrtcCreate (ScrnInfoPtr		scrn,
		const xf86CrtcFuncsRec	*funcs)
{
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    xf86CrtcPtr		crtc, *crtcs;

    crtc = xcalloc (sizeof (xf86CrtcRec), 1);
    if (!crtc)
	return NULL;
    crtc->scrn = scrn;
    crtc->funcs = funcs;
#ifdef RANDR_12_INTERFACE
    crtc->randr_crtc = NULL;
#endif
    crtc->rotation = RR_Rotate_0;
    crtc->desiredRotation = RR_Rotate_0;
    if (xf86_config->crtc)
	crtcs = xrealloc (xf86_config->crtc,
			  (xf86_config->num_crtc + 1) * sizeof (xf86CrtcPtr));
    else
	crtcs = xalloc ((xf86_config->num_crtc + 1) * sizeof (xf86CrtcPtr));
    if (!crtcs)
    {
	xfree (crtc);
	return NULL;
    }
    xf86_config->crtc = crtcs;
    xf86_config->crtc[xf86_config->num_crtc++] = crtc;
    return crtc;
}

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_X_EXPORT void
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xf86CrtcDestroy (xf86CrtcPtr crtc)
{
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(crtc->scrn);
    int			c;
    
    (*crtc->funcs->destroy) (crtc);
    for (c = 0; c < xf86_config->num_crtc; c++)
	if (xf86_config->crtc[c] == crtc)
	{
	    memmove (&xf86_config->crtc[c],
		     &xf86_config->crtc[c+1],
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		     ((xf86_config->num_crtc - (c + 1)) * sizeof(void*)));
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	    xf86_config->num_crtc--;
	    break;
	}
    xfree (crtc);
}


/**
 * Return whether any outputs are connected to the specified pipe
 */

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_X_EXPORT Bool
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xf86CrtcInUse (xf86CrtcPtr crtc)
{
    ScrnInfoPtr		pScrn = crtc->scrn;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int			o;
    
    for (o = 0; o < xf86_config->num_output; o++)
	if (xf86_config->output[o]->crtc == crtc)
	    return TRUE;
    return FALSE;
}

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_X_EXPORT void
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xf86CrtcSetScreenSubpixelOrder (ScreenPtr pScreen)
{
#ifdef RENDER
    int			subpixel_order = SubPixelUnknown;
    Bool		has_none = FALSE;
    ScrnInfoPtr		scrn = xf86Screens[pScreen->myNum];
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int			c, o;

    for (c = 0; c < xf86_config->num_crtc; c++)
    {
	xf86CrtcPtr crtc = xf86_config->crtc[c];
	
	for (o = 0; o < xf86_config->num_output; o++)
	{
	    xf86OutputPtr   output = xf86_config->output[o];

	    if (output->crtc == crtc)
	    {
		switch (output->subpixel_order) {
		case SubPixelNone:
		    has_none = TRUE;
		    break;
		case SubPixelUnknown:
		    break;
		default:
		    subpixel_order = output->subpixel_order;
		    break;
		}
	    }
	    if (subpixel_order != SubPixelUnknown)
		break;
	}
	if (subpixel_order != SubPixelUnknown)
	{
	    static const int circle[4] = {
		SubPixelHorizontalRGB,
		SubPixelVerticalRGB,
		SubPixelHorizontalBGR,
		SubPixelVerticalBGR,
	    };
	    int	rotate;
	    int c;
	    for (rotate = 0; rotate < 4; rotate++)
		if (crtc->rotation & (1 << rotate))
		    break;
	    for (c = 0; c < 4; c++)
		if (circle[c] == subpixel_order)
		    break;
	    c = (c + rotate) & 0x3;
	    if ((crtc->rotation & RR_Reflect_X) && !(c & 1))
		c ^= 2;
	    if ((crtc->rotation & RR_Reflect_Y) && (c & 1))
		c ^= 2;
	    subpixel_order = circle[c];
	    break;
	}
    }
    if (subpixel_order == SubPixelUnknown && has_none)
	subpixel_order = SubPixelNone;
    PictureSetSubpixelOrder (pScreen, subpixel_order);
#endif
}

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/**
 * Sets the given video mode on the given crtc
 */
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_X_EXPORT Bool
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xf86CrtcSetMode (xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation,
		 int x, int y)
{
    ScrnInfoPtr		scrn = crtc->scrn;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int			i;
    Bool		ret = FALSE;
    Bool		didLock = FALSE;
    DisplayModePtr	adjusted_mode;
    DisplayModeRec	saved_mode;
    int			saved_x, saved_y;
    Rotation		saved_rotation;

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    if (crtc->funcs->set_mode_major)
	return crtc->funcs->set_mode_major(crtc, mode, rotation, x, y);
	
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    crtc->enabled = xf86CrtcInUse (crtc);
    
    if (!crtc->enabled)
    {
	/* XXX disable crtc? */
	return TRUE;
    }

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    adjusted_mode = xf86DuplicateMode(mode);

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    didLock = crtc->funcs->lock (crtc);

    saved_mode = crtc->mode;
    saved_x = crtc->x;
    saved_y = crtc->y;
    saved_rotation = crtc->rotation;
    /* Update crtc values up front so the driver can rely on them for mode
     * setting.
     */
    crtc->mode = *mode;
    crtc->x = x;
    crtc->y = y;
    crtc->rotation = rotation;

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    /* Shift offsets that move us out of virtual size */
    if (x + mode->HDisplay > xf86_config->maxWidth ||
	y + mode->VDisplay > xf86_config->maxHeight)
    {
	if (x + mode->HDisplay > xf86_config->maxWidth)
	    crtc->x = xf86_config->maxWidth - mode->HDisplay;
	if (y + mode->VDisplay > xf86_config->maxHeight)
	    crtc->y = xf86_config->maxHeight - mode->VDisplay;
	if (crtc->x < 0 || crtc->y < 0)
	{
	    xf86DrvMsg (scrn->scrnIndex, X_ERROR,
			"Mode %dx%d does not fit virtual size %dx%d - "
			"internal error\n", mode->HDisplay, mode->VDisplay,
			xf86_config->maxWidth, xf86_config->maxHeight);
	    goto done;
	}
	xf86DrvMsg (scrn->scrnIndex, X_ERROR,
		    "Mode %dx%d+%d+%d does not fit virtual size %dx%d - "
		    "offset updated to +%d+%d\n",
		    mode->HDisplay, mode->VDisplay, x, y,
		    xf86_config->maxWidth, xf86_config->maxHeight,
		    crtc->x, crtc->y);
    }

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    /* XXX short-circuit changes to base location only */
    
    /* Pass our mode to the outputs and the CRTC to give them a chance to
     * adjust it according to limitations or output properties, and also
     * a chance to reject the mode entirely.
     */
    for (i = 0; i < xf86_config->num_output; i++) {
	xf86OutputPtr output = xf86_config->output[i];

	if (output->crtc != crtc)
	    continue;

	if (!output->funcs->mode_fixup(output, mode, adjusted_mode)) {
	    goto done;
	}
    }

    if (!crtc->funcs->mode_fixup(crtc, mode, adjusted_mode)) {
	goto done;
    }

    if (!xf86CrtcRotate (crtc, mode, rotation)) {
	goto done;
    }

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    /* Prepare the outputs and CRTCs before setting the mode. */
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    for (i = 0; i < xf86_config->num_output; i++) {
	xf86OutputPtr output = xf86_config->output[i];

	if (output->crtc != crtc)
	    continue;

	/* Disable the output as the first thing we do. */
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	output->funcs->prepare(output);
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    }

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    crtc->funcs->prepare(crtc);
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    /* Set up the DPLL and any output state that needs to adjust or depend
     * on the DPLL.
     */
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    crtc->funcs->mode_set(crtc, mode, adjusted_mode, crtc->x, crtc->y);
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    for (i = 0; i < xf86_config->num_output; i++) 
    {
	xf86OutputPtr output = xf86_config->output[i];
	if (output->crtc == crtc)
	    output->funcs->mode_set(output, mode, adjusted_mode);
    }

    /* Now, enable the clocks, plane, pipe, and outputs that we set up. */
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    crtc->funcs->commit(crtc);
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    for (i = 0; i < xf86_config->num_output; i++) 
    {
	xf86OutputPtr output = xf86_config->output[i];
	if (output->crtc == crtc)
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	{
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	    output->funcs->commit(output);
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#ifdef RANDR_12_INTERFACE
	    if (output->randr_output)
		RRPostPendingProperties (output->randr_output);
#endif
	}
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    }

    /* XXX free adjustedmode */
    ret = TRUE;
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    if (scrn->pScreen)
	xf86CrtcSetScreenSubpixelOrder (scrn->pScreen);
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done:
    if (!ret) {
	crtc->x = saved_x;
	crtc->y = saved_y;
	crtc->rotation = saved_rotation;
	crtc->mode = saved_mode;
    }

    if (didLock)
	crtc->funcs->unlock (crtc);

    return ret;
}

/*
 * Output functions
 */

extern XF86ConfigPtr xf86configptr;

typedef enum {
    OPTION_PREFERRED_MODE,
    OPTION_POSITION,
    OPTION_BELOW,
    OPTION_RIGHT_OF,
    OPTION_ABOVE,
    OPTION_LEFT_OF,
    OPTION_ENABLE,
    OPTION_DISABLE,
    OPTION_MIN_CLOCK,
    OPTION_MAX_CLOCK,
    OPTION_IGNORE,
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    OPTION_ROTATE,
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} OutputOpts;

static OptionInfoRec xf86OutputOptions[] = {
    {OPTION_PREFERRED_MODE, "PreferredMode",	OPTV_STRING,  {0}, FALSE },
    {OPTION_POSITION,	    "Position",		OPTV_STRING,  {0}, FALSE },
    {OPTION_BELOW,	    "Below",		OPTV_STRING,  {0}, FALSE },
    {OPTION_RIGHT_OF,	    "RightOf",		OPTV_STRING,  {0}, FALSE },
    {OPTION_ABOVE,	    "Above",		OPTV_STRING,  {0}, FALSE },
    {OPTION_LEFT_OF,	    "LeftOf",		OPTV_STRING,  {0}, FALSE },
    {OPTION_ENABLE,	    "Enable",		OPTV_BOOLEAN, {0}, FALSE },
    {OPTION_DISABLE,	    "Disable",		OPTV_BOOLEAN, {0}, FALSE },
    {OPTION_MIN_CLOCK,	    "MinClock",		OPTV_FREQ,    {0}, FALSE },
    {OPTION_MAX_CLOCK,	    "MaxClock",		OPTV_FREQ,    {0}, FALSE },
    {OPTION_IGNORE,	    "Ignore",		OPTV_BOOLEAN, {0}, FALSE },
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    {OPTION_ROTATE,	    "Rotate",		OPTV_STRING,  {0}, FALSE },
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    {-1,		    NULL,		OPTV_NONE,    {0}, FALSE },
};

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enum {
    OPTION_MODEDEBUG,
};

static OptionInfoRec xf86DeviceOptions[] = {
    {OPTION_MODEDEBUG,	    "ModeDebug",	OPTV_STRING,  {0}, FALSE },
    {-1,		    NULL,		OPTV_NONE,    {0}, FALSE },
};

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static void
xf86OutputSetMonitor (xf86OutputPtr output)
{
    char    *option_name;
    static const char monitor_prefix[] = "monitor-";
    char    *monitor;

    if (!output->name)
	return;

    if (output->options)
	xfree (output->options);

    output->options = xnfalloc (sizeof (xf86OutputOptions));
    memcpy (output->options, xf86OutputOptions, sizeof (xf86OutputOptions));
    
    option_name = xnfalloc (strlen (monitor_prefix) +
			    strlen (output->name) + 1);
    strcpy (option_name, monitor_prefix);
    strcat (option_name, output->name);
    monitor = xf86findOptionValue (output->scrn->options, option_name);
    if (!monitor)
	monitor = output->name;
    else
	xf86MarkOptionUsedByName (output->scrn->options, option_name);
    xfree (option_name);
    output->conf_monitor = xf86findMonitor (monitor,
					    xf86configptr->conf_monitor_lst);
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    /*
     * Find the monitor section of the screen and use that
     */
    if (!output->conf_monitor && output->use_screen_monitor)
	output->conf_monitor = xf86findMonitor (output->scrn->monitor->id,
						xf86configptr->conf_monitor_lst);
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    if (output->conf_monitor)
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    {
	xf86DrvMsg (output->scrn->scrnIndex, X_INFO,
		    "Output %s using monitor section %s\n",
		    output->name, output->conf_monitor->mon_identifier);
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	xf86ProcessOptions (output->scrn->scrnIndex,
			    output->conf_monitor->mon_option_lst,
			    output->options);
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    }
    else
	xf86DrvMsg (output->scrn->scrnIndex, X_INFO,
		    "Output %s has no monitor section\n",
		    output->name);
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}

static Bool
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xf86OutputEnabled (xf86OutputPtr output, Bool strict)
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{
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    Bool    enable, disable;

    /* check to see if this output was enabled in the config file */
    if (xf86GetOptValBool (output->options, OPTION_ENABLE, &enable) && enable)
    {
	xf86DrvMsg (output->scrn->scrnIndex, X_INFO,
		    "Output %s enabled by config file\n", output->name);
	return TRUE;
    }
    /* or if this output was disabled in the config file */
    if (xf86GetOptValBool (output->options, OPTION_DISABLE, &disable) && disable)
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    {
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	xf86DrvMsg (output->scrn->scrnIndex, X_INFO,
		    "Output %s disabled by config file\n", output->name);
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	return FALSE;
    }
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    /* If not, try to only light up the ones we know are connected */
    if (strict) {
	enable = output->status == XF86OutputStatusConnected;
    }
    /* But if that fails, try to light up even outputs we're unsure of */
    else {
	enable = output->status != XF86OutputStatusDisconnected;
    }

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    xf86DrvMsg (output->scrn->scrnIndex, X_INFO,
    	    "Output %s %sconnected\n", output->name, enable ? "" : "dis");
    return enable;
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}

static Bool
xf86OutputIgnored (xf86OutputPtr    output)
{
    return xf86ReturnOptValBool (output->options, OPTION_IGNORE, FALSE);
}

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static char *direction[4] = {
    "normal", 
    "left", 
    "inverted", 
    "right"
};

static Rotation
xf86OutputInitialRotation (xf86OutputPtr output)
{
    char    *rotate_name = xf86GetOptValString (output->options, 
						OPTION_ROTATE);
    int	    i;

    if (!rotate_name)
	return RR_Rotate_0;
    
    for (i = 0; i < 4; i++)
	if (xf86nameCompare (direction[i], rotate_name) == 0)
	    return (1 << i);
    return RR_Rotate_0;
}

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_X_EXPORT xf86OutputPtr
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xf86OutputCreate (ScrnInfoPtr		    scrn,
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		  const xf86OutputFuncsRec  *funcs,
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		  const char		    *name)
{
    xf86OutputPtr	output, *outputs;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int			len;

    if (name)
	len = strlen (name) + 1;
    else
	len = 0;

    output = xcalloc (sizeof (xf86OutputRec) + len, 1);
    if (!output)
	return NULL;
    output->scrn = scrn;
    output->funcs = funcs;
    if (name)
    {
	output->name = (char *) (output + 1);
	strcpy (output->name, name);
    }
    output->subpixel_order = SubPixelUnknown;
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    /*
     * Use the old per-screen monitor section for the first output
     */
    output->use_screen_monitor = (xf86_config->num_output == 0);
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#ifdef RANDR_12_INTERFACE
    output->randr_output = NULL;
#endif
    if (name)
    {
	xf86OutputSetMonitor (output);
	if (xf86OutputIgnored (output))
	{
	    xfree (output);
	    return FALSE;
	}
    }
    
    
    if (xf86_config->output)
	outputs = xrealloc (xf86_config->output,
			  (xf86_config->num_output + 1) * sizeof (xf86OutputPtr));
    else
	outputs = xalloc ((xf86_config->num_output + 1) * sizeof (xf86OutputPtr));
    if (!outputs)
    {
	xfree (output);
	return NULL;
    }
    
    xf86_config->output = outputs;
    xf86_config->output[xf86_config->num_output++] = output;
    
    return output;
}

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_X_EXPORT Bool
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xf86OutputRename (xf86OutputPtr output, const char *name)
{
    int	    len = strlen(name) + 1;
    char    *newname = xalloc (len);
    
    if (!newname)
	return FALSE;	/* so sorry... */
    
    strcpy (newname, name);
    if (output->name && output->name != (char *) (output + 1))
	xfree (output->name);
    output->name = newname;
    xf86OutputSetMonitor (output);
    if (xf86OutputIgnored (output))
	return FALSE;
    return TRUE;
}

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_X_EXPORT void
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xf86OutputUseScreenMonitor (xf86OutputPtr output, Bool use_screen_monitor)
{
    if (use_screen_monitor != output->use_screen_monitor)
    {
	output->use_screen_monitor = use_screen_monitor;
	xf86OutputSetMonitor (output);
    }
}

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_X_EXPORT void
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xf86OutputDestroy (xf86OutputPtr output)
{
    ScrnInfoPtr		scrn = output->scrn;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int			o;
    
    (*output->funcs->destroy) (output);
    while (output->probed_modes)
	xf86DeleteMode (&output->probed_modes, output->probed_modes);
    for (o = 0; o < xf86_config->num_output; o++)
	if (xf86_config->output[o] == output)
	{
	    memmove (&xf86_config->output[o],
		     &xf86_config->output[o+1],
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		     ((xf86_config->num_output - (o + 1)) * sizeof(void*)));
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	    xf86_config->num_output--;
	    break;
	}
    if (output->name && output->name != (char *) (output + 1))
	xfree (output->name);
    xfree (output);
}

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/*
 * Called during CreateScreenResources to hook up RandR
 */
static Bool
xf86CrtcCreateScreenResources (ScreenPtr screen)
{
    ScrnInfoPtr		scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);

    screen->CreateScreenResources = config->CreateScreenResources;
    
    if (!(*screen->CreateScreenResources)(screen))
	return FALSE;

    if (!xf86RandR12CreateScreenResources (screen))
	return FALSE;

    return TRUE;
}

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/*
 * Clean up config on server reset
 */
static Bool
xf86CrtcCloseScreen (int index, ScreenPtr screen)
{
    ScrnInfoPtr		scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);
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    int			o, c;
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    screen->CloseScreen = config->CloseScreen;

    xf86RotateCloseScreen (screen);

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    for (o = 0; o < config->num_output; o++)
    {
	xf86OutputPtr	output = config->output[o];

	output->randr_output = NULL;
    }
    for (c = 0; c < config->num_crtc; c++)
    {
	xf86CrtcPtr	crtc = config->crtc[c];

	crtc->randr_crtc = NULL;
    }
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    return screen->CloseScreen (index, screen);
}

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/*
 * Called at ScreenInit time to set up
 */
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_X_EXPORT
#ifdef RANDR_13_INTERFACE
int
#else
Bool
#endif
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xf86CrtcScreenInit (ScreenPtr screen)
{
    ScrnInfoPtr		scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);
    int			c;

    /* Rotation */
    xf86DrvMsg(scrn->scrnIndex, X_INFO, "RandR 1.2 enabled, ignore the following RandR disabled message.\n");
    xf86DisableRandR(); /* Disable old RandR extension support */
    xf86RandR12Init (screen);

    /* support all rotations if every crtc has the shadow alloc funcs */
    for (c = 0; c < config->num_crtc; c++)
    {
	xf86CrtcPtr crtc = config->crtc[c];
	if (!crtc->funcs->shadow_allocate || !crtc->funcs->shadow_create)
	    break;
    }
    if (c == config->num_crtc)
	xf86RandR12SetRotations (screen, RR_Rotate_0 | RR_Rotate_90 |
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Keith Packard committed
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				 RR_Rotate_180 | RR_Rotate_270 |
				 RR_Reflect_X | RR_Reflect_Y);
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    else
	xf86RandR12SetRotations (screen, RR_Rotate_0);
    
    /* Wrap CreateScreenResources so we can initialize the RandR code */
    config->CreateScreenResources = screen->CreateScreenResources;
    screen->CreateScreenResources = xf86CrtcCreateScreenResources;
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    config->CloseScreen = screen->CloseScreen;
    screen->CloseScreen = xf86CrtcCloseScreen;
    
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#ifdef RANDR_13_INTERFACE
    return RANDR_INTERFACE_VERSION;
#else
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    return TRUE;
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#endif
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}

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static DisplayModePtr
xf86DefaultMode (xf86OutputPtr output, int width, int height)
{
    DisplayModePtr  target_mode = NULL;
    DisplayModePtr  mode;
    int		    target_diff = 0;
    int		    target_preferred = 0;
    int		    mm_height;
    
    mm_height = output->mm_height;
    if (!mm_height)
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	mm_height = (768 * 25.4) / DEFAULT_DPI;
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    /*
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     * Pick a mode closest to DEFAULT_DPI
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     */
    for (mode = output->probed_modes; mode; mode = mode->next)
    {
	int	    dpi;
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	int	    preferred = (((mode->type & M_T_PREFERRED) != 0) +
				 ((mode->type & M_T_USERPREF) != 0));
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	int	    diff;

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	if (xf86ModeWidth (mode, output->initial_rotation) > width ||
	    xf86ModeHeight (mode, output->initial_rotation) > height)
	    continue;
	
	/* yes, use VDisplay here, not xf86ModeHeight */
	dpi = (mode->VDisplay * 254) / (mm_height * 10);
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	diff = dpi - DEFAULT_DPI;
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	diff = diff < 0 ? -diff : diff;
	if (target_mode == NULL || (preferred > target_preferred) ||
	    (preferred == target_preferred && diff < target_diff))
	{
	    target_mode = mode;
	    target_diff = diff;
	    target_preferred = preferred;
	}
    }
    return target_mode;
}

static DisplayModePtr
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xf86ClosestMode (xf86OutputPtr output, 
		 DisplayModePtr match, Rotation match_rotation,
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		 int width, int height)
{
    DisplayModePtr  target_mode = NULL;
    DisplayModePtr  mode;
    int		    target_diff = 0;
    
    /*
     * Pick a mode closest to the specified mode
     */
    for (mode = output->probed_modes; mode; mode = mode->next)
    {
	int	    dx, dy;
	int	    diff;

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	if (xf86ModeWidth (mode, output->initial_rotation) > width ||
	    xf86ModeHeight (mode, output->initial_rotation) > height)
	    continue;
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	/* exact matches are preferred */
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	if (output->initial_rotation == match_rotation &&
	    xf86ModesEqual (mode, match))
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	    return mode;
	
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	dx = xf86ModeWidth (match, match_rotation) - xf86ModeWidth (mode, output->initial_rotation);
	dy = xf86ModeHeight (match, match_rotation) - xf86ModeHeight (mode, output->initial_rotation);
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	diff = dx * dx + dy * dy;
	if (target_mode == NULL || diff < target_diff)
	{
	    target_mode = mode;
	    target_diff = diff;
	}
    }
    return target_mode;
}

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static DisplayModePtr
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xf86OutputHasPreferredMode (xf86OutputPtr output, int width, int height)
{
    DisplayModePtr  mode;

    for (mode = output->probed_modes; mode; mode = mode->next)
    {
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	if (xf86ModeWidth (mode, output->initial_rotation) > width ||
	    xf86ModeHeight (mode, output->initial_rotation) > height)
	    continue;

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	if (mode->type & M_T_PREFERRED)
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	    return mode;
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    }
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    return NULL;
}

static DisplayModePtr
xf86OutputHasUserPreferredMode (xf86OutputPtr output)
{
    DisplayModePtr mode, first = output->probed_modes;

    for (mode = first; mode && mode->next != first; mode = mode->next)
	if (mode->type & M_T_USERPREF)
	    return mode;

    return NULL;
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}

static int
xf86PickCrtcs (ScrnInfoPtr	scrn,
	       xf86CrtcPtr	*best_crtcs,
	       DisplayModePtr	*modes,
	       int		n,
	       int		width,
	       int		height)
{
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);
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    int		    c, o;
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    xf86OutputPtr   output;
    xf86CrtcPtr	    crtc;
    xf86CrtcPtr	    *crtcs;
    xf86CrtcPtr	    best_crtc;
    int		    best_score;
    int		    score;
    int		    my_score;
    
    if (n == config->num_output)
	return 0;
    output = config->output[n];
    
    /*
     * Compute score with this output disabled
     */
    best_crtcs[n] = NULL;
    best_crtc = NULL;
    best_score = xf86PickCrtcs (scrn, best_crtcs, modes, n+1, width, height);
    if (modes[n] == NULL)
	return best_score;
    
    crtcs = xalloc (config->num_output * sizeof (xf86CrtcPtr));
    if (!crtcs)
	return best_score;

    my_score = 1;
    /* Score outputs that are known to be connected higher */
    if (output->status == XF86OutputStatusConnected)
	my_score++;
    /* Score outputs with preferred modes higher */
    if (xf86OutputHasPreferredMode (output, width, height))
	my_score++;
    /*
     * Select a crtc for this output and
     * then attempt to configure the remaining
     * outputs
     */
    for (c = 0; c < config->num_crtc; c++)
    {
	if ((output->possible_crtcs & (1 << c)) == 0)
	    continue;
	
	crtc = config->crtc[c];
	/*
	 * Check to see if some other output is
	 * using this crtc
	 */
	for (o = 0; o < n; o++)
	    if (best_crtcs[o] == crtc)
		break;
	if (o < n)
	{
	    /*
	     * If the two outputs desire the same mode,
	     * see if they can be cloned
	     */
	    if (xf86ModesEqual (modes[o], modes[n]) &&
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		config->output[0]->initial_rotation == config->output[n]->initial_rotation &&
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		config->output[o]->initial_x == config->output[n]->initial_x &&
		config->output[o]->initial_y == config->output[n]->initial_y)
	    {
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		if ((output->possible_clones & (1 << o)) == 0)
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		    continue;		/* nope, try next CRTC */
	    }
	    else
		continue;		/* different modes, can't clone */
	}
	crtcs[n] = crtc;
	memcpy (crtcs, best_crtcs, n * sizeof (xf86CrtcPtr));
	score = my_score + xf86PickCrtcs (scrn, crtcs, modes, n+1, width, height);
	if (score > best_score)
	{
	    best_crtc = crtc;
	    best_score = score;
	    memcpy (best_crtcs, crtcs, config->num_output * sizeof (xf86CrtcPtr));
	}
    }
    xfree (crtcs);
    return best_score;
}


/*
 * Compute the virtual size necessary to place all of the available
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 * crtcs in the specified configuration.
 *
 * canGrow indicates that the driver can make the screen larger than its initial
 * configuration.  If FALSE, this function will enlarge the screen to include
 * the largest available mode.
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 */

static void
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xf86DefaultScreenLimits (ScrnInfoPtr scrn, int *widthp, int *heightp,
			 Bool canGrow)
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{
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);
    int	    width = 0, height = 0;
    int	    o;
    int	    c;
    int	    s;

    for (c = 0; c < config->num_crtc; c++)
    {
	int	    crtc_width = 0, crtc_height = 0;
	xf86CrtcPtr crtc = config->crtc[c];

	if (crtc->enabled)
	{
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	    crtc_width = crtc->x + xf86ModeWidth (&crtc->desiredMode, crtc->desiredRotation);
	    crtc_height = crtc->y + xf86ModeHeight (&crtc->desiredMode, crtc->desiredRotation);
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	}
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	if (!canGrow) {
	    for (o = 0; o < config->num_output; o++)
	    {
		xf86OutputPtr   output = config->output[o];
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		for (s = 0; s < config->num_crtc; s++)
		    if (output->possible_crtcs & (1 << s))
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		    {
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			DisplayModePtr  mode;
			for (mode = output->probed_modes; mode; mode = mode->next)
			{
			    if (mode->HDisplay > crtc_width)
				crtc_width = mode->HDisplay;
			    if (mode->VDisplay > crtc_width)
				crtc_width = mode->VDisplay;
			    if (mode->VDisplay > crtc_height)
				crtc_height = mode->VDisplay;
			    if (mode->HDisplay > crtc_height)
				crtc_height = mode->HDisplay;
			}
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		    }
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	    }
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	}
	if (crtc_width > width)
	    width = crtc_width;
	if (crtc_height > height)
	    height = crtc_height;
    }
    if (config->maxWidth && width > config->maxWidth) width = config->maxWidth;
    if (config->maxHeight && height > config->maxHeight) height = config->maxHeight;
    if (config->minWidth && width < config->minWidth) width = config->minWidth;
    if (config->minHeight && height < config->minHeight) height = config->minHeight;
    *widthp = width;
    *heightp = height;
}

#define POSITION_UNSET	-100000

static Bool
xf86InitialOutputPositions (ScrnInfoPtr scrn, DisplayModePtr *modes)
{
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);
    int			o;
    int			min_x, min_y;
    
    for (o = 0; o < config->num_output; o++)
    {
	xf86OutputPtr	output = config->output[o];

	output->initial_x = output->initial_y = POSITION_UNSET;
    }
    
    /*
     * Loop until all outputs are set
     */
    for (;;)
    {
	Bool	any_set = FALSE;
	Bool	keep_going = FALSE;

	for (o = 0; o < config->num_output; o++)	
	{
	    static const OutputOpts	relations[] = {
		OPTION_BELOW, OPTION_RIGHT_OF, OPTION_ABOVE, OPTION_LEFT_OF
	    };
	    xf86OutputPtr   output = config->output[o];
	    xf86OutputPtr   relative;
	    char	    *relative_name;
	    char	    *position;
	    OutputOpts	    relation;
	    int		    r;

	    if (output->initial_x != POSITION_UNSET)
		continue;
	    position = xf86GetOptValString (output->options,
					    OPTION_POSITION);
	    /*
	     * Absolute position wins
	     */
	    if (position)
	    {
		int		    x, y;
		if (sscanf (position, "%d %d", &x, &y) == 2)
		{
		    output->initial_x = x;
		    output->initial_y = y;
		}
		else
		{
		    xf86DrvMsg (scrn->scrnIndex, X_ERROR,
				"Output %s position not of form \"x y\"\n",
				output->name);
		    output->initial_x = output->initial_y = 0;
		}
		any_set = TRUE;
		continue;
	    }
	    /*
	     * Next comes relative positions
	     */
	    relation = 0;
	    relative_name = NULL;
	    for (r = 0; r < 4; r++)
	    {
		relation = relations[r];
		relative_name = xf86GetOptValString (output->options,
						     relation);
		if (relative_name)
		    break;
	    }
	    if (relative_name)
	    {
		int or;
		relative = NULL;
		for (or = 0; or < config->num_output; or++)
		{
		    xf86OutputPtr	out_rel = config->output[or];
		    XF86ConfMonitorPtr	rel_mon = out_rel->conf_monitor;

		    if (rel_mon)
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		    {
			if (xf86nameCompare (rel_mon->mon_identifier,
					      relative_name) == 0)
			{
			    relative = config->output[or];
			    break;
			}
		    }
		    if (strcmp (out_rel->name, relative_name) == 0)
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		    {
			relative = config->output[or];
			break;
		    }
		}
		if (!relative)
		{
		    xf86DrvMsg (scrn->scrnIndex, X_ERROR,
				"Cannot position output %s relative to unknown output %s\n",
				output->name, relative_name);
		    output->initial_x = 0;
		    output->initial_y = 0;
		    any_set = TRUE;
		    continue;
		}
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		if (!modes[or])
		{
		    xf86DrvMsg (scrn->scrnIndex, X_ERROR,
				"Cannot position output %s relative to output %s without modes\n",
				output->name, relative_name);
		    output->initial_x = 0;
		    output->initial_y = 0;
		    any_set = TRUE;
		    continue;
		}
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		if (relative->initial_x == POSITION_UNSET)
		{
		    keep_going = TRUE;
		    continue;
		}
		output->initial_x = relative->initial_x;
		output->initial_y = relative->initial_y;
		switch (relation) {
		case OPTION_BELOW:
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		    output->initial_y += xf86ModeHeight (modes[or], relative->initial_rotation);
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		    break;
		case OPTION_RIGHT_OF:
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		    output->initial_x += xf86ModeWidth (modes[or], relative->initial_rotation);
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		    break;
		case OPTION_ABOVE:
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		    output->initial_y -= xf86ModeHeight (modes[o], output->initial_rotation);
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		    break;
		case OPTION_LEFT_OF:
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		    output->initial_x -= xf86ModeWidth (modes[o], output->initial_rotation);
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		    break;
		default:
		    break;
		}
		any_set = TRUE;
		continue;
	    }
	    
	    /* Nothing set, just stick them at 0,0 */
	    output->initial_x = 0;
	    output->initial_y = 0;
	    any_set = TRUE;
	}
	if (!keep_going)
	    break;
	if (!any_set) 
	{
	    for (o = 0; o < config->num_output; o++)
	    {
		xf86OutputPtr   output = config->output[o];
		if (output->initial_x == POSITION_UNSET)
		{
		    xf86DrvMsg (scrn->scrnIndex, X_ERROR,
				"Output position loop. Moving %s to 0,0\n",
				output->name);
		    output->initial_x = output->initial_y = 0;
		    break;
		}
	    }
	}
    }

    /*
     * normalize positions
     */
    min_x = 1000000;
    min_y = 1000000;
    for (o = 0; o < config->num_output; o++)
    {
	xf86OutputPtr	output = config->output[o];

	if (output->initial_x < min_x)
	    min_x = output->initial_x;
	if (output->initial_y < min_y)
	    min_y = output->initial_y;
    }
    
    for (o = 0; o < config->num_output; o++)
    {
	xf86OutputPtr	output = config->output[o];

	output->initial_x -= min_x;
	output->initial_y -= min_y;
    }
    return TRUE;
}

/*
 * XXX walk the monitor mode list and prune out duplicates that
 * are inserted by xf86DDCMonitorSet. In an ideal world, that
 * function would do this work by itself.
 */

static void
xf86PruneDuplicateMonitorModes (MonPtr Monitor)
{
    DisplayModePtr  master, clone, next;

    for (master = Monitor->Modes; 
	 master && master != Monitor->Last; 
	 master = master->next)
    {
	for (clone = master->next; clone && clone != Monitor->Modes; clone = next)
	{
	    next = clone->next;
	    if (xf86ModesEqual (master, clone))
	    {
		if (Monitor->Last == clone)
		    Monitor->Last = clone->prev;
		xf86DeleteMode (&Monitor->Modes, clone);
	    }
	}
    }
}

/** Return - 0 + if a should be earlier, same or later than b in list
 */
static int
xf86ModeCompare (DisplayModePtr a, DisplayModePtr b)
{
    int	diff;

    diff = ((b->type & M_T_PREFERRED) != 0) - ((a->type & M_T_PREFERRED) != 0);
    if (diff)
	return diff;
    diff = b->HDisplay * b->VDisplay - a->HDisplay * a->VDisplay;
    if (diff)
	return diff;
    diff = b->Clock - a->Clock;
    return diff;
}

/**
 * Insertion sort input in-place and return the resulting head
 */
static DisplayModePtr
xf86SortModes (DisplayModePtr input)
{
    DisplayModePtr  output = NULL, i, o, n, *op, prev;

    /* sort by preferred status and pixel area */
    while (input)
    {
	i = input;
	input = input->next;
	for (op = &output; (o = *op); op = &o->next)
	    if (xf86ModeCompare (o, i) > 0)
		break;
	i->next = *op;
	*op = i;
    }
    /* prune identical modes */
    for (o = output; o && (n = o->next); o = n)
    {
	if (!strcmp (o->name, n->name) && xf86ModesEqual (o, n))
	{
	    o->next = n->next;
	    xfree (n->name);
	    xfree (n);
	    n = o;
	}
    }
    /* hook up backward links */
    prev = NULL;
    for (o = output; o; o = o->next)
    {
	o->prev = prev;
	prev = o;
    }
    return output;
}

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static char *
preferredMode(ScrnInfoPtr pScrn, xf86OutputPtr output)
{
    char *preferred_mode = NULL;

    /* Check for a configured preference for a particular mode */
    preferred_mode = xf86GetOptValString (output->options,
					  OPTION_PREFERRED_MODE);
    if (preferred_mode)
	return preferred_mode;

    if (pScrn->display->modes && *pScrn->display->modes)
	preferred_mode = *pScrn->display->modes;

    return preferred_mode;
}

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static void
GuessRangeFromModes(MonPtr mon, DisplayModePtr mode)
{
    if (!mon || !mode)
       return;

    mon->nHsync = 1;
    mon->hsync[0].lo = 1024.0;
    mon->hsync[0].hi = 0.0;

    mon->nVrefresh = 1;
    mon->vrefresh[0].lo = 1024.0;
    mon->vrefresh[0].hi = 0.0;

    while (mode) {
	if (!mode->HSync)
	    mode->HSync = ((float) mode->Clock ) / ((float) mode->HTotal);

	if (!mode->VRefresh)
	    mode->VRefresh = (1000.0 * ((float) mode->Clock)) / 
		((float) (mode->HTotal * mode->VTotal));

	if (mode->HSync < mon->hsync[0].lo)
	    mon->hsync[0].lo = mode->HSync;

	if (mode->HSync > mon->hsync[0].hi)
	    mon->hsync[0].hi = mode->HSync;

	if (mode->VRefresh < mon->vrefresh[0].lo)
	    mon->vrefresh[0].lo = mode->VRefresh;

	if (mode->VRefresh > mon->vrefresh[0].hi)
	    mon->vrefresh[0].hi = mode->VRefresh;

	mode = mode->next;
    }

    /* stretch out the bottom to fit 640x480@60 */
    if (mon->hsync[0].lo > 31.0)
       mon->hsync[0].lo = 31.0;
    if (mon->vrefresh[0].lo > 58.0)
       mon->vrefresh[0].lo = 58.0;
}

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_X_EXPORT void
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xf86ProbeOutputModes (ScrnInfoPtr scrn, int maxX, int maxY)
{
    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(scrn);
    int			o;

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    /* When canGrow was TRUE in the initial configuration we have to
     * compare against the maximum values so that we don't drop modes.
     * When canGrow was FALSE, the maximum values would have been clamped
     * anyway.
     */
    if (maxX == 0 || maxY == 0) {
	maxX = config->maxWidth;
	maxY = config->maxHeight;
    }
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    /* Elide duplicate modes before defaulting code uses them */
    xf86PruneDuplicateMonitorModes (scrn->monitor);
    
    /* Probe the list of modes for each output. */
    for (o = 0; o < config->num_output; o++) 
    {
	xf86OutputPtr	    output = config->output[o];
	DisplayModePtr	    mode;
	DisplayModePtr	    config_modes = NULL, output_modes, default_modes;
	char		    *preferred_mode;
	xf86MonPtr	    edid_monitor;
	XF86ConfMonitorPtr  conf_monitor;
	MonRec		    mon_rec;
	int		    min_clock = 0;
	int		    max_clock = 0;
	double		    clock;
	enum { sync_config, sync_edid, sync_default } sync_source = sync_default;
	
	while (output->probed_modes != NULL)
	    xf86DeleteMode(&output->probed_modes, output->probed_modes);

	/*
	 * Check connection status
	 */
	output->status = (*output->funcs->detect)(output);

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	if (output->status == XF86OutputStatusDisconnected)
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	{
	    xf86OutputSetEDID (output, NULL);
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	    continue;
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	}
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	memset (&mon_rec, '\0', sizeof (mon_rec));
	
	conf_monitor = output->conf_monitor;
	
	if (conf_monitor)
	{
	    int	i;
	    
	    for (i = 0; i < conf_monitor->mon_n_hsync; i++)
	    {
		mon_rec.hsync[mon_rec.nHsync].lo = conf_monitor->mon_hsync[i].lo;
		mon_rec.hsync[mon_rec.nHsync].hi = conf_monitor->mon_hsync[i].hi;
		mon_rec.nHsync++;
		sync_source = sync_config;
	    }
	    for (i = 0; i < conf_monitor->mon_n_vrefresh; i++)
	    {
		mon_rec.vrefresh[mon_rec.nVrefresh].lo = conf_monitor->mon_vrefresh[i].lo;
		mon_rec.vrefresh[mon_rec.nVrefresh].hi = conf_monitor->mon_vrefresh[i].hi;
		mon_rec.nVrefresh++;
		sync_source = sync_config;
	    }
	    config_modes = xf86GetMonitorModes (scrn, conf_monitor);
	}
	
	output_modes = (*output->funcs->get_modes) (output);
	
	edid_monitor = output->MonInfo;
	
	if (edid_monitor)
	{
	    int			    i;
	    Bool		    set_hsync = mon_rec.nHsync == 0;
	    Bool		    set_vrefresh = mon_rec.nVrefresh == 0;

	    for (i = 0; i < sizeof (edid_monitor->det_mon) / sizeof (edid_monitor->det_mon[0]); i++)
	    {
		if (edid_monitor->det_mon[i].type == DS_RANGES)
		{
		    struct monitor_ranges   *ranges = &edid_monitor->det_mon[i].section.ranges;
		    if (set_hsync && ranges->max_h)
		    {
			mon_rec.hsync[mon_rec.nHsync].lo = ranges->min_h;
			mon_rec.hsync[mon_rec.nHsync].hi = ranges->max_h;
			mon_rec.nHsync++;
			if (sync_source == sync_default)
			    sync_source = sync_edid;
		    }
		    if (set_vrefresh && ranges->max_v)
		    {
			mon_rec.vrefresh[mon_rec.nVrefresh].lo = ranges->min_v;
			mon_rec.vrefresh[mon_rec.nVrefresh].hi = ranges->max_v;
			mon_rec.nVrefresh++;
			if (sync_source == sync_default)
			    sync_source = sync_edid;
		    }
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		    if (ranges->max_clock * 1000 > max_clock)
			max_clock = ranges->max_clock * 1000;
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		}
	    }
	}

	if (xf86GetOptValFreq (output->options, OPTION_MIN_CLOCK,
			       OPTUNITS_KHZ, &clock))
	    min_clock = (int) clock;
	if (xf86GetOptValFreq (output->options, OPTION_MAX_CLOCK,
			       OPTUNITS_KHZ, &clock))
	    max_clock = (int) clock;

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	/* If we still don't have a sync range, guess wildly */
	if (!mon_rec.nHsync || !mon_rec.nVrefresh)
	    GuessRangeFromModes(&mon_rec, output_modes);

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	/*
	 * These limits will end up setting a 1024x768@60Hz mode by default,
	 * which seems like a fairly good mode to use when nothing else is
	 * specified
	 */
	if (mon_rec.nHsync == 0)
	{
	    mon_rec.hsync[0].lo = 31.0;
	    mon_rec.hsync[0].hi = 55.0;
	    mon_rec.nHsync = 1;
	}
	if (mon_rec.nVrefresh == 0)
	{
	    mon_rec.vrefresh[0].lo = 58.0;
	    mon_rec.vrefresh[0].hi = 62.0;
	    mon_rec.nVrefresh = 1;
	}
	default_modes = xf86GetDefaultModes (output->interlaceAllowed,
					     output->doubleScanAllowed);
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	/*
	 * If this is not an RB monitor, remove RB modes from the default
	 * pool.  RB modes from the config or the monitor itself are fine.
	 */
	if (!mon_rec.reducedblanking)
	    xf86ValidateModesReducedBlanking (scrn, default_modes);

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	if (sync_source == sync_config)
	{
	    /* 
	     * Check output and config modes against sync range from config file
	     */
	    xf86ValidateModesSync (scrn, output_modes, &mon_rec);
	    xf86ValidateModesSync (scrn, config_modes, &mon_rec);
	}
	/*
	 * Check default modes against sync range
	 */
        xf86ValidateModesSync (scrn, default_modes, &mon_rec);
	/*
	 * Check default modes against monitor max clock
	 */
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	if (max_clock) {
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	    xf86ValidateModesClocks(scrn, default_modes,
				    &min_clock, &max_clock, 1);
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	    xf86ValidateModesClocks(scrn, output_modes,
				    &min_clock, &max_clock, 1);
	}
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	output->probed_modes = NULL;
	output->probed_modes = xf86ModesAdd (output->probed_modes, config_modes);
	output->probed_modes = xf86ModesAdd (output->probed_modes, output_modes);
	output->probed_modes = xf86ModesAdd (output->probed_modes, default_modes);
	
	/*
	 * Check all modes against max size
	 */
	if (maxX && maxY)
	    xf86ValidateModesSize (scrn, output->probed_modes,
				       maxX, maxY, 0);
	 
	/*
	 * Check all modes against output
	 */
	for (mode = output->probed_modes; mode != NULL; mode = mode->next) 
	    if (mode->status == MODE_OK)
		mode->status = (*output->funcs->mode_valid)(output, mode);
	
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	xf86PruneInvalidModes(scrn, &output->probed_modes,
			      config->debug_modes);
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	output->probed_modes = xf86SortModes (output->probed_modes);
	
	/* Check for a configured preference for a particular mode */
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	preferred_mode = preferredMode(scrn, output);
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	if (preferred_mode)
	{
	    for (mode = output->probed_modes; mode; mode = mode->next)
	    {
		if (!strcmp (preferred_mode, mode->name))
		{
		    if (mode != output->probed_modes)
		    {
			if (mode->prev)
			    mode->prev->next = mode->next;
			if (mode->next)
			    mode->next->prev = mode->prev;
			mode->next = output->probed_modes;
			output->probed_modes->prev = mode;
			mode->prev = NULL;
			output->probed_modes = mode;
		    }
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		    mode->type |= (M_T_PREFERRED|M_T_USERPREF);
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		    break;
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		}
	    }
	}
	
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	output->initial_rotation = xf86OutputInitialRotation (output);

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	if (config->debug_modes) {
	    if (output->probed_modes != NULL) {
		xf86DrvMsg(scrn->scrnIndex, X_INFO,
			   "Printing probed modes for output %s\n",
			   output->name);
	    } else {
		xf86DrvMsg(scrn->scrnIndex, X_INFO,
			   "No remaining probed modes for output %s\n",
			   output->name);
	    }
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	}
	for (mode = output->probed_modes; mode != NULL; mode = mode->next)
	{
	    /* The code to choose the best mode per pipe later on will require
	     * VRefresh to be set.
	     */
	    mode->VRefresh = xf86ModeVRefresh(mode);
	    xf86SetModeCrtc(mode, INTERLACE_HALVE_V);

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	    if (config->debug_modes)
		xf86PrintModeline(scrn->scrnIndex, mode);
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	}
    }
}


/**
 * Copy one of the output mode lists to the ScrnInfo record
 */

/* XXX where does this function belong? Here? */
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_X_EXPORT void
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xf86RandR12GetOriginalVirtualSize(ScrnInfoPtr scrn, int *x, int *y);

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static DisplayModePtr
biggestMode(DisplayModePtr a, DisplayModePtr b)
{
    int A, B;

    if (!a)
	return b;
    if (!b)
	return a;

    A = a->HDisplay * a->VDisplay;
    B = b->HDisplay * b->VDisplay;

    if (A > B)
	return a;

    return b;
}

static xf86OutputPtr
SetCompatOutput(xf86CrtcConfigPtr config)
{
    xf86OutputPtr output = NULL, test = NULL;
    DisplayModePtr maxmode = NULL, testmode, mode;
    int o, compat = -1, count, mincount = 0;

    /* Look for one that's definitely connected */
    for (o = 0; o < config->num_output; o++)
    {
	test = config->output[o];
	if (!test->crtc)
	    continue;
	if (test->status != XF86OutputStatusConnected)
	    continue;
	if (!test->probed_modes)
	    continue;

	testmode = mode = test->probed_modes;
	for (count = 0; mode; mode = mode->next, count++)
	    testmode = biggestMode(testmode, mode);

	if (!output) {
	    output = test;
	    compat = o;
	    maxmode = testmode;
	    mincount = count;
	} else if (maxmode == biggestMode(maxmode, testmode)) {
	    output = test;
	    compat = o;
	    maxmode = testmode;
	    mincount = count;
	} else if ((maxmode->HDisplay == testmode->HDisplay) && 
		(maxmode->VDisplay == testmode->VDisplay) &&
		count <= mincount) {
	    output = test;
	    compat = o;
	    maxmode = testmode;
	    mincount = count;
	}
    }

    /* If we didn't find one, take anything we can get */
    if (!output)
    {
	for (o = 0; o < config->num_output; o++)
	{
	    test = config->output[o];
	    if (!test->crtc)
		continue;
	    if (!test->probed_modes)
		continue;

	    if (!output) {
		output = test;
		compat = o;
	    } else if (test->probed_modes->HDisplay < output->