[PATCH 3/9] drm/core: Add drm_encoder_index.

Maarten Lankhorst
2015-11-24T09:34:30Z

This is useful for adding encoder_mask in crtc_state.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/drm_crtc.c | 23 +++++++++++++++++++++++
include/drm/drm_crtc.h | 1 +
2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 32dd134700bd..904a34c560f4 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1121,6 +1121,29 @@ out_unlock:
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
*
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 173535a35d65..29cfb4f8f99d 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1241,6 +1241,7 @@ extern int drm_encoder_init(struct drm_device *dev,
struct drm_encoder *encoder,
const struct drm_encoder_funcs *funcs,
int encoder_type);
+extern unsigned int drm_encoder_index(struct drm_encoder *encoder);

/**
* drm_encoder_crtc_ok - can a given crtc drive a given encoder?
--
2.1.0