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drm: add more document for drm_crtc_from_index() 

Add a bit more document for function drm_crtc_from_index() to cross
link it with drm_crtc_from_index(), and explain that the function is
useful in vblank code.

While at it, add cross link comment for drm_plane_from_index() as well.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1483779131-19935-1-git-send-email-shawnguo@kernel.org
This commit is contained in:
Shawn Guo 2017-01-07 16:52:11 +08:00 committed by Daniel Vetter
parent a09759e82f
commit 931c670d20
2 changed files with 5 additions and 2 deletions
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5
drivers/gpu/drm/drm_crtc.c
View File

@ -52,7 +52,10 @@
* @idx: index of registered CRTC to find for
*
* Given a CRTC index, return the registered CRTC from DRM device's
* list of CRTCs with matching index.
* list of CRTCs with matching index. This is the inverse of drm_crtc_index().
* It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
* &drm_driver.disable_vblank), since that still deals with indices instead
* of pointers to &struct drm_crtc."
*/
struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
{

2
drivers/gpu/drm/drm_plane.c
View File

@ -254,7 +254,7 @@ EXPORT_SYMBOL(drm_plane_cleanup);
* @idx: index of registered plane to find for
*
* Given a plane index, return the registered plane from DRM device's
* list of planes with matching index.
* list of planes with matching index. This is the inverse of drm_plane_index().
*/
struct drm_plane *
drm_plane_from_index(struct drm_device *dev, int idx)