drm/i915: add port field to struct intel_dp and use it

This will be needed for Haswell, but already has its uses here.

This patch started as a small patch written patch by Shobhit Kumar,
but it has changed so much that none of its original lines remain.

Credits-to: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -6764,10 +6764,10 @@ static void intel_setup_outputs(struct drm_device *dev)
 		dpd_is_edp = intel_dpd_is_edp(dev);
 
 		if (has_edp_a(dev))
-			intel_dp_init(dev, DP_A);
+			intel_dp_init(dev, DP_A, PORT_A);
 
 		if (dpd_is_edp && (I915_READ(PCH_DP_D) & DP_DETECTED))
-			intel_dp_init(dev, PCH_DP_D);
+			intel_dp_init(dev, PCH_DP_D, PORT_D);
 	}
 
 	intel_crt_init(dev);
@@ -6800,7 +6800,7 @@ static void intel_setup_outputs(struct drm_device *dev)
 			if (!found)
 				intel_hdmi_init(dev, HDMIB, PORT_B);
 			if (!found && (I915_READ(PCH_DP_B) & DP_DETECTED))
-				intel_dp_init(dev, PCH_DP_B);
+				intel_dp_init(dev, PCH_DP_B, PORT_B);
 		}
 
 		if (I915_READ(HDMIC) & PORT_DETECTED)
@@ -6810,10 +6810,10 @@ static void intel_setup_outputs(struct drm_device *dev)
 			intel_hdmi_init(dev, HDMID, PORT_D);
 
 		if (I915_READ(PCH_DP_C) & DP_DETECTED)
-			intel_dp_init(dev, PCH_DP_C);
+			intel_dp_init(dev, PCH_DP_C, PORT_C);
 
 		if (!dpd_is_edp && (I915_READ(PCH_DP_D) & DP_DETECTED))
-			intel_dp_init(dev, PCH_DP_D);
+			intel_dp_init(dev, PCH_DP_D, PORT_D);
 	} else if (IS_VALLEYVIEW(dev)) {
 		int found;
 
@@ -6823,7 +6823,7 @@ static void intel_setup_outputs(struct drm_device *dev)
 			if (!found)
 				intel_hdmi_init(dev, SDVOB, PORT_B);
 			if (!found && (I915_READ(DP_B) & DP_DETECTED))
-				intel_dp_init(dev, DP_B);
+				intel_dp_init(dev, DP_B, PORT_B);
 		}
 
 		if (I915_READ(SDVOC) & PORT_DETECTED)
@@ -6831,7 +6831,7 @@ static void intel_setup_outputs(struct drm_device *dev)
 
 		/* Shares lanes with HDMI on SDVOC */
 		if (I915_READ(DP_C) & DP_DETECTED)
-			intel_dp_init(dev, DP_C);
+			intel_dp_init(dev, DP_C, PORT_C);
 	} else if (SUPPORTS_DIGITAL_OUTPUTS(dev)) {
 		bool found = false;
 
@@ -6845,7 +6845,7 @@ static void intel_setup_outputs(struct drm_device *dev)
 
 			if (!found && SUPPORTS_INTEGRATED_DP(dev)) {
 				DRM_DEBUG_KMS("probing DP_B\n");
-				intel_dp_init(dev, DP_B);
+				intel_dp_init(dev, DP_B, PORT_B);
 			}
 		}
 
@@ -6864,14 +6864,14 @@ static void intel_setup_outputs(struct drm_device *dev)
 			}
 			if (SUPPORTS_INTEGRATED_DP(dev)) {
 				DRM_DEBUG_KMS("probing DP_C\n");
-				intel_dp_init(dev, DP_C);
+				intel_dp_init(dev, DP_C, PORT_C);
 			}
 		}
 
 		if (SUPPORTS_INTEGRATED_DP(dev) &&
 		    (I915_READ(DP_D) & DP_DETECTED)) {
 			DRM_DEBUG_KMS("probing DP_D\n");
-			intel_dp_init(dev, DP_D);
+			intel_dp_init(dev, DP_D, PORT_D);
 		}
 	} else if (IS_GEN2(dev))
 		intel_dvo_init(dev);

drivers/gpu/drm/i915/intel_dp.c

@@ -2426,7 +2426,7 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
 }
 
 void
-intel_dp_init(struct drm_device *dev, int output_reg)
+intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_connector *connector;
@@ -2441,6 +2441,7 @@ intel_dp_init(struct drm_device *dev, int output_reg)
 		return;
 
 	intel_dp->output_reg = output_reg;
+	intel_dp->port = port;
 	intel_dp->dpms_mode = -1;
 
 	intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
@@ -2486,28 +2487,25 @@ intel_dp_init(struct drm_device *dev, int output_reg)
 	drm_sysfs_connector_add(connector);
 
 	/* Set up the DDC bus. */
-	switch (output_reg) {
-		case DP_A:
-			name = "DPDDC-A";
-			break;
-		case DP_B:
-		case PCH_DP_B:
-			dev_priv->hotplug_supported_mask |=
-				DPB_HOTPLUG_INT_STATUS;
-			name = "DPDDC-B";
-			break;
-		case DP_C:
-		case PCH_DP_C:
-			dev_priv->hotplug_supported_mask |=
-				DPC_HOTPLUG_INT_STATUS;
-			name = "DPDDC-C";
-			break;
-		case DP_D:
-		case PCH_DP_D:
-			dev_priv->hotplug_supported_mask |=
-				DPD_HOTPLUG_INT_STATUS;
-			name = "DPDDC-D";
-			break;
+	switch (port) {
+	case PORT_A:
+		name = "DPDDC-A";
+		break;
+	case PORT_B:
+		dev_priv->hotplug_supported_mask |= DPB_HOTPLUG_INT_STATUS;
+		name = "DPDDC-B";
+		break;
+	case PORT_C:
+		dev_priv->hotplug_supported_mask |= DPC_HOTPLUG_INT_STATUS;
+		name = "DPDDC-C";
+		break;
+	case PORT_D:
+		dev_priv->hotplug_supported_mask |= DPD_HOTPLUG_INT_STATUS;
+		name = "DPDDC-D";
+		break;
+	default:
+		WARN(1, "Invalid port %c\n", port_name(port));
+		break;
 	}
 
 	intel_dp_i2c_init(intel_dp, intel_connector, name);

drivers/gpu/drm/i915/intel_drv.h

@@ -306,6 +306,7 @@ struct intel_dp {
 	uint8_t  link_configuration[DP_LINK_CONFIGURATION_SIZE];
 	bool has_audio;
 	enum hdmi_force_audio force_audio;
+	enum port port;
 	uint32_t color_range;
 	int dpms_mode;
 	uint8_t link_bw;
@@ -375,7 +376,8 @@ extern void intel_tv_init(struct drm_device *dev);
 extern void intel_mark_busy(struct drm_device *dev,
 			    struct drm_i915_gem_object *obj);
 extern bool intel_lvds_init(struct drm_device *dev);
-extern void intel_dp_init(struct drm_device *dev, int dp_reg);
+extern void intel_dp_init(struct drm_device *dev, int output_reg,
+			  enum port port);
 void
 intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 		 struct drm_display_mode *adjusted_mode);