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>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e86fd39..f8c2aa1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6764,10 +6764,10 @@
 		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 @@
 			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 @@
 			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 @@
 			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 @@
 
 		/* 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 @@
 
 			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 @@
 			}
 			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);