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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-12-08 09:49:20 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-01-05 10:07:51 +0100 |
| commit | 4cba68507cf58db99752cf79198beb4a85a9f8ce (patch) | |
| tree | ce0e53f48983a7414baedc51df01a284908fe7e6 /include/drm/drm_crtc.h | |
| parent | 4cd9fa529d77dde8f760adb3d934dfac6e169b1e (diff) | |
| download | linux-4cba68507cf58db99752cf79198beb4a85a9f8ce.tar.gz linux-4cba68507cf58db99752cf79198beb4a85a9f8ce.tar.bz2 linux-4cba68507cf58db99752cf79198beb4a85a9f8ce.zip | |
drm/atomic-helper: Reject legacy flips on a disabled pipe
We want this for consistency with existing page_flip semantics.
Since this spurred quite a discussion on IRC also document why we
reject event generation when the pipe is off: It's not that it's hard
to implement, but userspace has a track recording which proves that it's
way too easy to accidentally abuse and cause havoc. We want to make
sure userspace doesn't get away with that.
v2: Somehow thought we do reject events already, but that code only
existed in my imagination ... Also suggestions from Thierry.
Cc: Daniel Stone <daniels@collabora.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449564561-3896-4-git-send-email-daniel.vetter@ffwll.ch
Diffstat (limited to 'include/drm/drm_crtc.h')
| -rw-r--r-- | include/drm/drm_crtc.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index e3c4d486e1af..c65a212db77e 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -551,7 +551,8 @@ struct drm_crtc_funcs { * ->page_flip() operation is already pending the callback should return * -EBUSY. Pageflips on a disabled CRTC (either by setting a NULL mode * or just runtime disabled through DPMS respectively the new atomic - * "ACTIVE" state) should result in an -EINVAL error code. + * "ACTIVE" state) should result in an -EINVAL error code. Note that + * drm_atomic_helper_page_flip() checks this already for atomic drivers. */ int (*page_flip)(struct drm_crtc *crtc, struct drm_framebuffer *fb, |