Add xf86SetDesiredModes to apply desired modes to crtcs.

xf86SetDesiredModes applies the desired modes to each crtc (as selected by
xf86InitialConfiguration initially and modified by successful mode settings
afterwards). For crtcs without a desired mode, pScrn->currentMode is used to
select something workable.
(cherry picked from commit bcade98cca)

hw/xfree86/modes/xf86Crtc.c

@@ -1542,6 +1542,63 @@ xf86InitialConfiguration (ScrnInfoPtr scrn, Bool canGrow)
     return TRUE;
 }
 
+/*
+ * Using the desired mode information in each crtc, set
+ * modes (used in EnterVT functions, or at server startup)
+ */
+
+Bool
+xf86SetDesiredModes (ScrnInfoPtr scrn)
+{
+    xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(scrn);
+    int			c;
+
+    for (c = 0; c < config->num_crtc; c++)
+    {
+	xf86CrtcPtr	crtc = config->crtc[c];
+	xf86OutputPtr	output = NULL;
+	int		o;
+
+	if (config->output[config->compat_output]->crtc == crtc)
+	    output = config->output[config->compat_output];
+	else
+	{
+	    for (o = 0; o < config->num_output; o++)
+		if (config->output[o]->crtc == crtc)
+		{
+		    output = config->output[o];
+		    break;
+		}
+	}
+	/*
+	 * Skip disabled crtcs
+	 */
+	if (!output)
+	    continue;
+
+	/* Mark that we'll need to re-set the mode for sure */
+	memset(&crtc->mode, 0, sizeof(crtc->mode));
+	if (!crtc->desiredMode.CrtcHDisplay)
+	{
+	    DisplayModePtr  mode = xf86OutputFindClosestMode (output, scrn->currentMode);
+
+	    if (!mode)
+		return FALSE;
+	    crtc->desiredMode = *mode;
+	    crtc->desiredRotation = RR_Rotate_0;
+	    crtc->desiredX = 0;
+	    crtc->desiredY = 0;
+	}
+
+	if (!xf86CrtcSetMode (crtc, &crtc->desiredMode, crtc->desiredRotation,
+			      crtc->desiredX, crtc->desiredY))
+	    return FALSE;
+    }
+
+    xf86DisableUnusedFunctions(scrn);
+    return TRUE;
+}
+
 /**
  * In the current world order, there are lists of modes per output, which may
  * or may not include the mode that was asked to be set by XFree86's mode

hw/xfree86/modes/xf86Crtc.h

@@ -644,4 +644,12 @@ xf86CrtcSetScreenSubpixelOrder (ScreenPtr pScreen);
 char *
 xf86ConnectorGetName(xf86ConnectorType connector);
 
+/*
+ * Using the desired mode information in each crtc, set
+ * modes (used in EnterVT functions, or at server startup)
+ */
+
+Bool
+xf86SetDesiredModes (ScrnInfoPtr pScrn);
+
 #endif /* _XF86CRTC_H_ */

hw/xfree86/modes/xf86Rename.h

@@ -76,5 +76,8 @@
 #define xf86CrtcSetScreenSubpixelOrder XF86NAME(xf86CrtcSetScreenSubpixelOrder)
 #define xf86ModeWidth XF86NAME(xf86ModeWidth)
 #define xf86ModeHeight XF86NAME(xf86ModeHeight)
+#define xf86OutputFindClosestMode XF86NAME(xf86OutputFindClosestMode)
+#define xf86SetSingleMode XF86NAME(xf86SetSingleMode)
+#define xf86SetDesiredModes XF86NAME(xf86SetDesiredModes)
 
 #endif /* _XF86RENAME_H_ */