[PATCH 6/6] drm/i915: Reject page flips with changed format/offset/pitch

ville.syrjala
2012-05-24T18:08:59Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

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>
---
drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f4338cb..72ac2f9 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6217,6 +6217,19 @@ 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;
--
1.7.3.4

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