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drm/i915: Reject page flips with changed format/offset/pitch 

MI display flips can't handle some changes in the framebuffer
format or layout. Return an error in such cases.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2012-05-24 21:08:59 +03:00 committed by Daniel Vetter
parent 3a7f2f6a9e
commit e6a595d2db
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/i915/intel_display.c
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@ -6438,6 +6438,19 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
unsigned long flags;
int ret;
/* Can't change pixel format via MI display flips. */
if (fb->pixel_format != crtc->fb->pixel_format)
return -EINVAL;
/*
* TILEOFF/LINOFF registers can't be changed via MI display flips.
* Note that pitch changes could also affect these register.
*/
if (INTEL_INFO(dev)->gen > 3 &&
(fb->offsets[0] != crtc->fb->offsets[0] ||
fb->pitches[0] != crtc->fb->pitches[0]))
return -EINVAL;
work = kzalloc(sizeof *work, GFP_KERNEL);
if (work == NULL)
return -ENOMEM;