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drm: Add drm_crtc_vblank_waitqueue()

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Add a small static inline helper to grab the vblank wait queue based on
the drm_crtc.

This is useful for drivers to do internal vblank waits using
wait_event() & co.

v2: Pimp commit message (Daniel)
    Add kernel doc (Daniel)

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-05-22 19:36:03 +03:00 committed by Daniel Vetter
parent b95af8bee5
commit 020178a1bc
2 changed files with 12 additions and 0 deletions
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1
Documentation/DocBook/drm.tmpl
View File

@ -3400,6 +3400,7 @@ void (*disable_vblank) (struct drm_device *dev, int crtc);</synopsis>
<sect2>
<title>Vertical Blanking and Interrupt Handling Functions Reference</title>
!Edrivers/gpu/drm/drm_irq.c
!Iinclude/drm/drmP.h drm_crtc_vblank_waitqueue
</sect2>
</sect1>

11
include/drm/drmP.h
View File

@ -1344,6 +1344,17 @@ extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
extern void drm_calc_timestamping_constants(struct drm_crtc *crtc,
const struct drm_display_mode *mode);
/**
* drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
* @crtc: which CRTC's vblank waitqueue to retrieve
*
* This function returns a pointer to the vblank waitqueue for the CRTC.
* Drivers can use this to implement vblank waits using wait_event() & co.
*/
static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
{
return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
}
/* Modesetting support */
extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);