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drm/i915: Do not set "Enable Panel Fitter" on SNB pageflips 

Not only do the pageflip work without it at non-native modes (i.e. with
the panel fitter enabled), it also causes normal (non-pageflipped)
modesets to fail.

Reported-by: Adam Jackson <ajax@redhat.com>
Tested-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Wanted-by-for-fixes: Dave Airlie <airlied@gmail.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-04-17 20:37:00 +01:00 committed by Daniel Vetter
parent c291be9dba
commit 99d9acdd0c
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/i915/intel_display.c
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@ -7468,7 +7468,13 @@ static int intel_gen6_queue_flip(struct drm_device *dev,
OUT_RING(fb->pitches[0] | obj->tiling_mode);
OUT_RING(obj->gtt_offset);
pf = I915_READ(PF_CTL(intel_crtc->pipe)) & PF_ENABLE;
/* Contrary to the suggestions in the documentation,
* "Enable Panel Fitter" does not seem to be required when page
* flipping with a non-native mode, and worse causes a normal
* modeset to fail.
* pf = I915_READ(PF_CTL(intel_crtc->pipe)) & PF_ENABLE;
*/
pf = 0;
pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
OUT_RING(pf | pipesrc);
ADVANCE_LP_RING();