From: Chris Wilson <chris at chris-wilson.co.uk> This addresses WaPruneModeWithIncorrectHsyncOffset. Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=50236 Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk> Signed-off-by: Jani Nikula <jani.nikula at intel.com> --- drivers/gpu/drm/i915/intel_display.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index ada736d..526bd8b 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3425,6 +3425,13 @@ static bool intel_crtc_mode_fixup(struct drm_crtc *crtc, adjusted_mode->hsync_start >= adjusted_mode->hsync_end) return false; + /* 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; } -- 1.7.4.1
