drm/i915: Add new helper to return current attached encoder for connector

For introducing splitted encoder/connector structure, this helper will return
connector's attached encoder when needed.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 412b442..f9e11e8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4983,6 +4983,31 @@ struct drm_encoder *intel_best_encoder(struct drm_connector *connector)
 }
 
 /*
+ * Return which encoder is currently attached for connector.
+ */
+struct drm_encoder *intel_attached_encoder (struct drm_connector *connector)
+{
+       struct drm_mode_object *obj;
+       struct drm_encoder *encoder;
+       int i;
+
+       for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
+               if (connector->encoder_ids[i] == 0)
+                       break;
+
+               obj = drm_mode_object_find(connector->dev,
+                                           connector->encoder_ids[i],
+                                           DRM_MODE_OBJECT_ENCODER);
+               if (!obj)
+                       continue;
+
+               encoder = obj_to_encoder(obj);
+               return encoder;
+       }
+       return NULL;
+}
+
+/*
  * set vga decode state - true == enable VGA decode
  */
 int intel_modeset_vga_set_state(struct drm_device *dev, bool state)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d48c312..5b2e3b2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -190,6 +190,7 @@ extern void intel_encoder_prepare (struct drm_encoder *encoder);
 extern void intel_encoder_commit (struct drm_encoder *encoder);
 
 extern struct drm_encoder *intel_best_encoder(struct drm_connector *connector);
+extern struct drm_encoder *intel_attached_encoder(struct drm_connector *connector);
 
 extern struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
                                                    struct drm_crtc *crtc);