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drm/core: Add drm_encoder_index. 

This is useful for adding encoder_mask in crtc_state.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1452160762-30487-2-git-send-email-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2016-01-07 10:59:18 +01:00 committed by Daniel Vetter
parent 2dbf0d9097
commit 47d7777f99
2 changed files with 24 additions and 0 deletions
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23
drivers/gpu/drm/drm_crtc.c
View File

@ -1160,6 +1160,29 @@ int drm_encoder_init(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_encoder_init);
/**
* drm_encoder_index - find the index of a registered encoder
* @encoder: encoder to find index for
*
* Given a registered encoder, return the index of that encoder within a DRM
* device's list of encoders.
*/
unsigned int drm_encoder_index(struct drm_encoder *encoder)
{
unsigned int index = 0;
struct drm_encoder *tmp;
drm_for_each_encoder(tmp, encoder->dev) {
if (tmp == encoder)
return index;
index++;
}
BUG();
}
EXPORT_SYMBOL(drm_encoder_index);
/**
* drm_encoder_cleanup - cleans up an initialised encoder
* @encoder: encoder to cleanup

1
include/drm/drm_crtc.h
View File

@ -2225,6 +2225,7 @@ int drm_encoder_init(struct drm_device *dev,
struct drm_encoder *encoder,
const struct drm_encoder_funcs *funcs,
int encoder_type, const char *name, ...);
extern unsigned int drm_encoder_index(struct drm_encoder *encoder);
/**
* drm_encoder_crtc_ok - can a given crtc drive a given encoder?