diff options
| author | Rob Clark <rob@ti.com> | 2012-10-16 22:48:40 (GMT) |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-11-20 05:47:21 (GMT) |
| commit | c6eefa1750ec0308956895027c3a79eee2ef9726 (patch) | |
| tree | 9bff1495c1be215c41d956578262575723c19895 /Documentation | |
| parent | edec4af4c3d6d225578290a9acc38c78147df55b (diff) | |
| download | linux-c6eefa1750ec0308956895027c3a79eee2ef9726.tar.xz | |
drm: add drm_send_vblank_event() helper (v5)
A helper that drivers can use to send vblank event after a pageflip.
If the driver doesn't support proper vblank irq based time/seqn then
just pass -1 for the pipe # to get do_gettimestamp() behavior (since
there are a lot of drivers that don't use drm_vblank_count_and_time())
Also an internal send_vblank_event() helper for the various other code
paths within drm_irq that also need to send vblank events.
v1: original
v2: add back 'vblwait->reply.sequence = seq' which should not have
been deleted
v3: add WARN_ON() in case lock is not held and comments
v4: use WARN_ON_SMP() instead to fix issue with !SMP && !DEBUG_SPINLOCK
as pointed out by Marcin Slusarz
v5: update docbook
Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/drm.tmpl | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index b030052..c9cbb3f 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -1141,23 +1141,13 @@ int max_width, max_height;</synopsis> the <methodname>page_flip</methodname> operation will be called with a non-NULL <parameter>event</parameter> argument pointing to a <structname>drm_pending_vblank_event</structname> instance. Upon page - flip completion the driver must fill the - <parameter>event</parameter>::<structfield>event</structfield> - <structfield>sequence</structfield>, <structfield>tv_sec</structfield> - and <structfield>tv_usec</structfield> fields with the associated - vertical blanking count and timestamp, add the event to the - <parameter>drm_file</parameter> list of events to be signaled, and wake - up any waiting process. This can be performed with + flip completion the driver must call <methodname>drm_send_vblank_event</methodname> + to fill in the event and send to wake up any waiting processes. + This can be performed with <programlisting><![CDATA[ - struct timeval now; - - event->event.sequence = drm_vblank_count_and_time(..., &now); - event->event.tv_sec = now.tv_sec; - event->event.tv_usec = now.tv_usec; - spin_lock_irqsave(&dev->event_lock, flags); - list_add_tail(&event->base.link, &event->base.file_priv->event_list); - wake_up_interruptible(&event->base.file_priv->event_wait); + ... + drm_send_vblank_event(dev, pipe, event); spin_unlock_irqrestore(&dev->event_lock, flags); ]]></programlisting> </para> |