From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index dd64a06..ef247d5 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3739,6 +3739,14 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
goto out;
}
+ if (crtc->fb->pixel_format != fb->pixel_format ||
+ crtc->fb->bits_per_pixel != crtc->fb->bits_per_pixel ||
+ crtc->fb->depth != fb->depth) {
+ 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);
--
1.8.1.5
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