drm/i915: simplify assignments inside intel_dp.c

 - Replace container_of with enc_to_intel_dp.
 - Walk through less structures when making assignments.
 - Rename some variables to keep our naming standards.

As a bonus, this will reduce the usage of "struct intel_dp", making
the future patch that introduces intel_digital_port smaller and easier
to review.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -76,8 +76,7 @@ static bool is_cpu_edp(struct intel_dp *intel_dp)
 
 static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
 {
-	return container_of(intel_attached_encoder(connector),
-			    struct intel_dp, base);
+	return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
 }
 
 /**
@@ -105,7 +104,7 @@ void
 intel_edp_link_config(struct intel_encoder *intel_encoder,
 		       int *lane_num, int *link_bw)
 {
-	struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
+	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
 	*lane_num = intel_dp->lane_count;
 	*link_bw = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
@@ -115,7 +114,7 @@ int
 intel_edp_target_clock(struct intel_encoder *intel_encoder,
 		       struct drm_display_mode *mode)
 {
-	struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
+	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
 	struct intel_connector *intel_connector = intel_dp->attached_connector;
 
 	if (intel_connector->panel.fixed_mode)
@@ -771,7 +770,8 @@ intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 		 struct drm_display_mode *adjusted_mode)
 {
 	struct drm_device *dev = crtc->dev;
-	struct intel_encoder *encoder;
+	struct intel_encoder *intel_encoder;
+	struct intel_dp *intel_dp;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	int lane_count = 4;
@@ -782,11 +782,11 @@ intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 	/*
 	 * Find the lane count in the intel_encoder private
 	 */
-	for_each_encoder_on_crtc(dev, crtc, encoder) {
-		struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
+		intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
-		if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT ||
-		    intel_dp->base.type == INTEL_OUTPUT_EDP)
+		if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
+		    intel_encoder->type == INTEL_OUTPUT_EDP)
 		{
 			lane_count = intel_dp->lane_count;
 			break;
@@ -848,7 +848,7 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
-	struct drm_crtc *crtc = intel_dp->base.base.crtc;
+	struct drm_crtc *crtc = encoder->crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
 	/*
@@ -2278,7 +2278,7 @@ static enum drm_connector_status
 intel_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
-	struct drm_device *dev = intel_dp->base.base.dev;
+	struct drm_device *dev = connector->dev;
 	enum drm_connector_status status;
 	struct edid *edid = NULL;
 	char dpcd_hex_dump[sizeof(intel_dp->dpcd) * 3];
@@ -2316,7 +2316,7 @@ static int intel_dp_get_modes(struct drm_connector *connector)
 {
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
 	struct intel_connector *intel_connector = to_intel_connector(connector);
-	struct drm_device *dev = intel_dp->base.base.dev;
+	struct drm_device *dev = connector->dev;
 	int ret;
 
 	/* We should parse the EDID data and find out if it has an audio sink
@@ -2492,7 +2492,7 @@ static const struct drm_encoder_funcs intel_dp_enc_funcs = {
 static void
 intel_dp_hot_plug(struct intel_encoder *intel_encoder)
 {
-	struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
+	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
 	intel_dp_check_link_status(intel_dp);
 }
@@ -2502,13 +2502,14 @@ int
 intel_trans_dp_port_sel(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
-	struct intel_encoder *encoder;
+	struct intel_encoder *intel_encoder;
+	struct intel_dp *intel_dp;
 
-	for_each_encoder_on_crtc(dev, crtc, encoder) {
-		struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
+		intel_dp = enc_to_intel_dp(&intel_encoder->base);
 
-		if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT ||
-		    intel_dp->base.type == INTEL_OUTPUT_EDP)
+		if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
+		    intel_encoder->type == INTEL_OUTPUT_EDP)
 			return intel_dp->output_reg;
 	}
 
@@ -2802,8 +2803,8 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
 		} else {
 			/* if this fails, presume the device is a ghost */
 			DRM_INFO("failed to retrieve link info, disabling eDP\n");
-			intel_dp_encoder_destroy(&intel_dp->base.base);
-			intel_dp_destroy(&intel_connector->base);
+			intel_dp_encoder_destroy(&intel_encoder->base);
+			intel_dp_destroy(connector);
 			return;
 		}