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drm/i915: Cantiga+ cannot handle a hsync front porch of 0

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This addresses WaPruneModeWithIncorrectHsyncOffset.

Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=50236
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-06-21 13:19:59 +03:00 committed by Daniel Vetter
parent de9932d13c
commit 44f46b4222
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/intel_display.c
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@ -3602,6 +3602,13 @@ static bool intel_crtc_mode_fixup(struct drm_crtc *crtc,
if (!(adjusted_mode->private_flags & INTEL_MODE_CRTC_TIMINGS_SET))
drm_mode_set_crtcinfo(adjusted_mode, 0);
/* WaPruneModeWithIncorrectHsyncOffset: Cantiga+ cannot handle modes
* with a hsync front porch of 0.
*/
if ((INTEL_INFO(dev)->gen > 4 || IS_G4X(dev)) &&
adjusted_mode->hsync_start == adjusted_mode->hdisplay)
return false;
return true;
}