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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>
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@ -6438,6 +6438,19 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
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unsigned long flags;
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int ret;
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/* Can't change pixel format via MI display flips. */
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if (fb->pixel_format != crtc->fb->pixel_format)
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return -EINVAL;
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/*
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* TILEOFF/LINOFF registers can't be changed via MI display flips.
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* Note that pitch changes could also affect these register.
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*/
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if (INTEL_INFO(dev)->gen > 3 &&
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(fb->offsets[0] != crtc->fb->offsets[0] ||
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fb->pitches[0] != crtc->fb->pitches[0]))
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return -EINVAL;
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work = kzalloc(sizeof *work, GFP_KERNEL);
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if (work == NULL)
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return -ENOMEM;
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