[Intel-gfx] [PATCH 02/10] drm/i915: Make intel_dp_detect() more clear to read

[José Roberto de Souza]

Moving all the error handling to the end of the function and ealier
returning for connected MST ports make this function way more easy to
read.
No functional changed is intended here.

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 55 +++++++++++++++++++--------------
 1 file changed, 31 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 15a981ef5966..5a84a929bc7d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5077,28 +5077,20 @@ intel_dp_detect(struct drm_connector *connector,
 
 	intel_display_power_get(dev_priv, intel_dp->aux_power_domain);
 
-	/* Can't disconnect eDP */
+	/* Is port connected? eDP can't be disconnected */
+	if (!intel_dp_is_edp(intel_dp) &&
+	    !intel_digital_port_connected(encoder)) {
+		status = connector_status_disconnected;
+		goto port_disconnected;
+	}
+
 	if (intel_dp_is_edp(intel_dp))
 		status = edp_detect(intel_dp);
-	else if (intel_digital_port_connected(encoder))
-		status = intel_dp_detect_dpcd(intel_dp);
 	else
-		status = connector_status_disconnected;
-
-	if (status == connector_status_disconnected) {
-		memset(&intel_dp->compliance, 0, sizeof(intel_dp->compliance));
-
-		if (intel_dp->is_mst) {
-			DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n",
-				      intel_dp->is_mst,
-				      intel_dp->mst_mgr.mst_state);
-			intel_dp->is_mst = false;
-			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr,
-							intel_dp->is_mst);
-		}
+		status = intel_dp_detect_dpcd(intel_dp);
 
-		goto out;
-	}
+	if (status == connector_status_disconnected)
+		goto port_not_detected;
 
 	if (intel_dp->reset_link_params) {
 		/* Initial max link lane count */
@@ -5123,8 +5115,8 @@ intel_dp_detect(struct drm_connector *connector,
 		 * won't appear connected or have anything
 		 * with EDID on it
 		 */
-		status = connector_status_disconnected;
-		goto out;
+		intel_display_power_put(dev_priv, intel_dp->aux_power_domain);
+		return connector_status_disconnected;
 	}
 
 	/*
@@ -5151,14 +5143,29 @@ intel_dp_detect(struct drm_connector *connector,
 	intel_dp->aux.i2c_defer_count = 0;
 
 	intel_dp_set_edid(intel_dp);
-	if (intel_dp_is_edp(intel_dp) ||
-	    to_intel_connector(connector)->detect_edid)
+	/*
+	 * intel_dp_detect_dpcd() will return connector_status_unknown for some
+	 * type of DP devices, if edid can be read set status as connected
+	 */
+	if (to_intel_connector(connector)->detect_edid)
 		status = connector_status_connected;
 
 	intel_dp_check_service_irq(intel_dp);
 
-out:
-	if (status != connector_status_connected && !intel_dp->is_mst)
+	intel_display_power_put(dev_priv, intel_dp->aux_power_domain);
+	return status;
+
+port_not_detected:
+port_disconnected:
+	memset(&intel_dp->compliance, 0, sizeof(intel_dp->compliance));
+
+	if (intel_dp->is_mst) {
+		DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n",
+			      intel_dp->is_mst, intel_dp->mst_mgr.mst_state);
+		intel_dp->is_mst = false;
+		drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr,
+						intel_dp->is_mst);
+	} else
 		intel_dp_unset_edid(intel_dp);
 
 	intel_display_power_put(dev_priv, intel_dp->aux_power_domain);
-- 
2.19.0