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drm/doc: clarify how to acquire required vblank event reference

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As a driver write it is not entirely obvious that a reference to
the event e mentioned in the doc can be obtained via
drm_crtc_vblank_get(). Clarify how to obtain the reference.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180807201143.7446-1-stefan@agner.ch
This commit is contained in:
Stefan Agner 2018-08-07 22:11:43 +02:00 committed by Daniel Vetter
parent 31e63d31ea
commit e750218d26
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/drm_vblank.c
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@ -873,8 +873,8 @@ static void send_vblank_event(struct drm_device *dev,
* handler by calling drm_crtc_send_vblank_event() and make sure that there's no
* possible race with the hardware committing the atomic update.
*
* Caller must hold a vblank reference for the event @e, which will be dropped
* when the next vblank arrives.
* Caller must hold a vblank reference for the event @e acquired by a
* drm_crtc_vblank_get(), which will be dropped when the next vblank arrives.
*/
void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
struct drm_pending_vblank_event *e)