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drm: better document how to send out the crtc disable event

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The kernel doc explained what needs to happen, but not how to most
easily accomplish that using the functions. Fix that.

Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170524145212.27837-14-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-05-24 16:51:48 +02:00
parent 46466b0dac
commit 8938d13585
1 changed files with 3 additions and 1 deletions
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4
include/drm/drm_crtc.h
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@ -214,7 +214,9 @@ struct drm_crtc_state {
* atomic commit. In that case the event can be send out any time
* after the hardware has stopped scanning out the current
* framebuffers. It should contain the timestamp and counter for the
* last vblank before the display pipeline was shut off.
* last vblank before the display pipeline was shut off. The simplest
* way to achieve that is calling drm_crtc_send_vblank_event()
* somewhen after drm_crtc_vblank_off() has been called.
*
* - For a CRTC which is enabled at the end of the commit (even when it
* undergoes an full modeset) the vblank timestamp and counter must