drm: Don't allow page flip to change pixel format
A page flip is not a mode set, changing the frame buffer pixel format
doesn't make sense and isn't handled by most drivers anyway. Disallow
it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 957fb70..c577bae 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3638,6 +3638,12 @@
goto out;
}
+ if (crtc->fb->pixel_format != fb->pixel_format) {
+ DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
ret = -ENOMEM;
spin_lock_irqsave(&dev->event_lock, flags);