[Intel-gfx] [PATCH 06/19] drm/i915: Add new helper to return current attached encoder for connector

[Zhenyu Wang]

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

Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   25 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |    1 +
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8014b4f..e1eee6b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4969,6 +4969,31 @@ 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
--- 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);
-- 
1.6.3.3