Merge tag 'drm/for-3.14-rc1-20140123' of git://anongit.freedesktop.org/tegra/linux...

[karo-tx-linux.git] / drivers / gpu / drm / drm_crtc.c

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 266a01d7f6353db7a5e28d23a86215e85bf18d78..3b7d32da16046ffcdc238ba41b1b03a3ec152435 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -674,6 +674,29 @@ void drm_crtc_cleanup(struct drm_crtc *crtc)
 }
 EXPORT_SYMBOL(drm_crtc_cleanup);
 
+/**
+ * drm_crtc_index - find the index of a registered CRTC
+ * @crtc: CRTC to find index for
+ *
+ * Given a registered CRTC, return the index of that CRTC within a DRM
+ * device's list of CRTCs.
+ */
+unsigned int drm_crtc_index(struct drm_crtc *crtc)
+{
+       unsigned int index = 0;
+       struct drm_crtc *tmp;
+
+       list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) {
+               if (tmp == crtc)
+                       return index;
+
+               index++;
+       }
+
+       BUG();
+}
+EXPORT_SYMBOL(drm_crtc_index);
+
 /**
  * drm_mode_probed_add - add a mode to a connector's probed mode list
  * @connector: connector the new mode