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| author | Thierry Reding <thierry.reding@avionic-design.de> | 2013-02-13 16:08:33 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@avionic-design.de> | 2013-02-22 08:21:07 +0100 |
| commit | 8cf1e9811471f2910fa38dc1b28e1789080ba961 (patch) | |
| tree | 45b779f761fba928171b9d8a9c1928398737a5d5 /Documentation | |
| parent | c976cb37a95a8dcaf23d04d6487fbacc33d3c913 (diff) | |
| download | op-kernel-dev-8cf1e9811471f2910fa38dc1b28e1789080ba961.zip op-kernel-dev-8cf1e9811471f2910fa38dc1b28e1789080ba961.tar.gz | |
drm: Add consistency check for page-flipping
Driver implementations of the drm_crtc's .page_flip() function are
required to update the crtc->fb field on success to reflect that the new
framebuffer is now in use. This is important to keep reference counting
on the framebuffers balanced.
While at it, document this requirement to keep others from falling into
the same trap.
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/drm.tmpl | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index 51e1904..a6428dd 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -1161,6 +1161,12 @@ int max_width, max_height;</synopsis> any new rendering to the frame buffer until the page flip completes. </para> <para> + If a page flip can be successfully scheduled the driver must set the + <code>drm_crtc-<fb</code> field to the new framebuffer pointed to + by <code>fb</code>. This is important so that the reference counting + on framebuffers stays balanced. + </para> + <para> If a page flip is already pending, the <methodname>page_flip</methodname> operation must return -<errorname>EBUSY</errorname>. |
