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drm: add crtc helper drm_crtc_from_index()

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It adds a crtc helper drm_crtc_from_index() to find the registered CRTC
with a given index, just like drm_plane_from_index().

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/1483015290-16660-2-git-send-email-shawnguo@kernel.org
This commit is contained in:
Shawn Guo 2016-12-29 20:41:28 +08:00 committed by Daniel Vetter
parent b5c3714fe8
commit 6d1b81d8e2
2 changed files with 21 additions and 0 deletions
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20
drivers/gpu/drm/drm_crtc.c
View File

@ -46,6 +46,26 @@
#include "drm_crtc_internal.h"
#include "drm_internal.h"
/**
* drm_crtc_from_index - find the registered CRTC at an index
* @dev: DRM device
* @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.
*/
struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
{
struct drm_crtc *crtc;
drm_for_each_crtc(crtc, dev)
if (idx == crtc->index)
return crtc;
return NULL;
}
EXPORT_SYMBOL(drm_crtc_from_index);
/**
* drm_crtc_force_disable - Forcibly turn off a CRTC
* @crtc: CRTC to turn off

1
include/drm/drm_crtc.h
View File

@ -822,6 +822,7 @@ int drm_crtc_force_disable(struct drm_crtc *crtc);
int drm_crtc_force_disable_all(struct drm_device *dev);
int drm_mode_set_config_internal(struct drm_mode_set *set);
struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx);
/* Helpers */
static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,