UBUNTU: SAUCE: drm/core: Add drm_encoder_index.

BugLink: http://bugs.launchpad.net/bugs/1540390

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
(backported from drm-intel-next commit 47d7777f)

Avoid backporting commits passing *name to drm_encoder_init.
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>

drivers/gpu/drm/drm_crtc.c

@@ -1120,6 +1120,29 @@ 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

include/drm/drm_crtc.h

@@ -1242,6 +1242,7 @@ 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?