drm/i915: Move audio_connector to intel_encoder

With DP MST, a digital_port can carry more than one audio stream. Hence,
more than one audio_connector needs to be attached to intel_digital_port in
such cases. However, each stream is associated with an unique encoder. So,
instead of creating an array of audio_connectors per port, move
audio_connector from struct intel_digital_port to struct intel_encoder.
This also simplifies access to the right audio_connector from codec
functions in intel_audio.c that receive intel_encoder.

v2: Removed locals that are not needed anymore.

v3: No code change except for minor change in context.
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Lyude <cpaul@redhat.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1474334681-22690-5-git-send-email-dhinakaran.pandiyan@intel.com

drivers/gpu/drm/i915/intel_audio.c

@@ -490,7 +490,6 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
 	struct drm_connector *connector;
 	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
 	struct i915_audio_component *acomp = dev_priv->audio_component;
-	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
 	enum port port = intel_encoder->port;
 
 	connector = drm_select_eld(encoder);
@@ -515,7 +514,7 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
 						     adjusted_mode);
 
 	mutex_lock(&dev_priv->av_mutex);
-	intel_dig_port->audio_connector = connector;
+	intel_encoder->audio_connector = connector;
 	/* referred in audio callbacks */
 	dev_priv->dig_port_map[port] = intel_encoder;
 	mutex_unlock(&dev_priv->av_mutex);
@@ -536,14 +535,13 @@ void intel_audio_codec_disable(struct intel_encoder *intel_encoder)
 	struct drm_encoder *encoder = &intel_encoder->base;
 	struct drm_i915_private *dev_priv = to_i915(encoder->dev);
 	struct i915_audio_component *acomp = dev_priv->audio_component;
-	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
 	enum port port = intel_encoder->port;
 
 	if (dev_priv->display.audio_codec_disable)
 		dev_priv->display.audio_codec_disable(intel_encoder);
 
 	mutex_lock(&dev_priv->av_mutex);
-	intel_dig_port->audio_connector = NULL;
+	intel_encoder->audio_connector = NULL;
 	dev_priv->dig_port_map[port] = NULL;
 	mutex_unlock(&dev_priv->av_mutex);
 
@@ -704,7 +702,6 @@ static int i915_audio_component_get_eld(struct device *kdev, int port,
 {
 	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
 	struct intel_encoder *intel_encoder;
-	struct intel_digital_port *intel_dig_port;
 	const u8 *eld;
 	int ret = -EINVAL;
 
@@ -713,10 +710,9 @@ static int i915_audio_component_get_eld(struct device *kdev, int port,
 	/* intel_encoder might be NULL for DP MST */
 	if (intel_encoder) {
 		ret = 0;
-		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
-		*enabled = intel_dig_port->audio_connector != NULL;
+		*enabled = intel_encoder->audio_connector != NULL;
 		if (*enabled) {
-			eld = intel_dig_port->audio_connector->eld;
+			eld = intel_encoder->audio_connector->eld;
 			ret = drm_eld_size(eld);
 			memcpy(buf, eld, min(max_bytes, ret));
 		}

drivers/gpu/drm/i915/intel_drv.h

@@ -248,6 +248,8 @@ struct intel_encoder {
 	void (*suspend)(struct intel_encoder *);
 	int crtc_mask;
 	enum hpd_pin hpd_pin;
+	/* for communication with audio component; protected by av_mutex */
+	const struct drm_connector *audio_connector;
 };
 
 struct intel_panel {
@@ -960,8 +962,6 @@ struct intel_digital_port {
 	enum irqreturn (*hpd_pulse)(struct intel_digital_port *, bool);
 	bool release_cl2_override;
 	uint8_t max_lanes;
-	/* for communication with audio component; protected by av_mutex */
-	const struct drm_connector *audio_connector;
 };
 
 struct intel_dp_mst_encoder {