[070/119] drm: work around EDIDs with bad htotal/vtotal values

[Greg KH]

2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>

commit 7064fef56369c9e2c6e35ff6d6b4b63d42a859ce upstream.

We did this on the userspace side, but we need a similar fix for the
kernel.

Fixes LP #460664.

Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/gpu/drm/drm_edid.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -333,6 +333,12 @@ static struct drm_display_mode *drm_mode
 	mode->vsync_end = mode->vsync_start + vsync_pulse_width;
 	mode->vtotal = mode->vdisplay + vblank;
 
+	/* Some EDIDs have bogus h/vtotal values */
+	if (mode->hsync_end > mode->htotal)
+		mode->htotal = mode->hsync_end + 1;
+	if (mode->vsync_end > mode->vtotal)
+		mode->vtotal = mode->vsync_end + 1;
+
 	drm_mode_set_name(mode);
 
 	if (pt->misc & DRM_EDID_PT_INTERLACED)


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