[PATCH] drm/radeon/kms: rework radeon_dp_detect() logic

[Alex Deucher]

If the connector is eDP, it can only be DP, not TMDS.
Always set the detected sink type.  If the sink is
detected as non-DP, but there is no EDID, you can still
manually force the port on.  If the sink type is DP
and there's no DPCD, there's no way to force the monitor
on since you need both ends to train the link.

Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
---
 drivers/gpu/drm/radeon/radeon_connectors.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 20c353c..31a09cd 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -977,24 +977,25 @@ static enum drm_connector_status radeon_dp_detect(struct drm_connector *connecto
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	enum drm_connector_status ret = connector_status_disconnected;
 	struct radeon_connector_atom_dig *radeon_dig_connector = radeon_connector->con_priv;
-	u8 sink_type;
 
 	if (radeon_connector->edid) {
 		kfree(radeon_connector->edid);
 		radeon_connector->edid = NULL;
 	}
 
-	sink_type = radeon_dp_getsinktype(radeon_connector);
-	if ((sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
-	    (sink_type == CONNECTOR_OBJECT_ID_eDP)) {
-		if (radeon_dp_getdpcd(radeon_connector)) {
-			radeon_dig_connector->dp_sink_type = sink_type;
+	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+		/* eDP is always DP */
+		radeon_dig_connector->dp_sink_type = CONNECTOR_OBJECT_ID_DISPLAYPORT;
+		if (radeon_dp_getdpcd(radeon_connector))
 			ret = connector_status_connected;
-		}
 	} else {
-		if (radeon_ddc_probe(radeon_connector)) {
-			radeon_dig_connector->dp_sink_type = sink_type;
-			ret = connector_status_connected;
+		radeon_dig_connector->dp_sink_type = radeon_dp_getsinktype(radeon_connector);
+		if (radeon_dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) {
+			if (radeon_dp_getdpcd(radeon_connector))
+				ret = connector_status_connected;
+		} else {
+			if (radeon_ddc_probe(radeon_connector))
+				ret = connector_status_connected;
 		}
 	}
 
-- 
1.7.1.1