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drm: Adding drm helper function drm_plane_from_index().

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Adding drm helper function to return plane pointer from index where
index is a returned by drm_plane_index.

v2:
-avoided nested loop by adding loop count (Daniel)

v3:
-updated patch header prefix to 'drm' (Matt)

v4:
-fixed a kerneldoc issue (kbuild-internal)

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chandra Konduru 2015-04-09 17:36:21 -07:00 committed by Daniel Vetter
parent 595e1eeb26
commit f81338a52a
2 changed files with 24 additions and 0 deletions
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23
drivers/gpu/drm/drm_crtc.c
View File

@ -1285,6 +1285,29 @@ unsigned int drm_plane_index(struct drm_plane *plane)
}
EXPORT_SYMBOL(drm_plane_index);
/**
* drm_plane_from_index - find the registered plane at an index
* @dev: DRM device
* @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.
*/
struct drm_plane *
drm_plane_from_index(struct drm_device *dev, int idx)
{
struct drm_plane *plane;
unsigned int i = 0;
list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
if (i == idx)
return plane;
i++;
}
return NULL;
}
EXPORT_SYMBOL(drm_plane_from_index);
/**
* drm_plane_force_disable - Forcibly disable a plane
* @plane: plane to disable

1
include/drm/drm_crtc.h
View File

@ -1264,6 +1264,7 @@ extern int drm_plane_init(struct drm_device *dev,
bool is_primary);
extern void drm_plane_cleanup(struct drm_plane *plane);
extern unsigned int drm_plane_index(struct drm_plane *plane);
extern struct drm_plane * drm_plane_from_index(struct drm_device *dev, int idx);
extern void drm_plane_force_disable(struct drm_plane *plane);
extern int drm_plane_check_pixel_format(const struct drm_plane *plane,
u32 format);