drm/radeon/kms: rewrite DP handling

- reorganize the functions based on use
- clean up function naming
- rework link training to better match what we use internally
- add initial support for DP 1.2 (no MST yet)
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_connectors.c

@@ -59,7 +59,7 @@ void radeon_connector_hotplug(struct drm_connector *connector)
 		    (radeon_dp_getsinktype(radeon_connector) == CONNECTOR_OBJECT_ID_eDP)) {
 			if (radeon_dp_needs_link_train(radeon_connector)) {
 				if (connector->encoder)
-					dp_link_train(connector->encoder, connector);
+					radeon_dp_link_train(connector->encoder, connector);
 			}
 		}
 	}
@@ -1195,7 +1195,7 @@ static int radeon_dp_mode_valid(struct drm_connector *connector,
 
 	if ((radeon_dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
 	    (radeon_dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP))
-		return radeon_dp_mode_valid_helper(radeon_connector, mode);
+		return radeon_dp_mode_valid_helper(connector, mode);
 	else
 		return MODE_OK;
 }

drivers/gpu/drm/radeon/radeon_encoders.c

@@ -1417,7 +1417,9 @@ radeon_atom_encoder_dpms(struct drm_encoder *encoder, int mode)
 								     ATOM_TRANSMITTER_ACTION_POWER_ON);
 					radeon_dig_connector->edp_on = true;
 				}
-				dp_link_train(encoder, connector);
+				if (ASIC_IS_DCE4(rdev))
+					atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_OFF, 0);
+				radeon_dp_link_train(encoder, connector);
 				if (ASIC_IS_DCE4(rdev))
 					atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0);
 			}

drivers/gpu/drm/radeon/radeon_mode.h

@@ -471,12 +471,12 @@ extern bool radeon_connector_is_dp12_capable(struct drm_connector *connector);
 
 extern void radeon_connector_hotplug(struct drm_connector *connector);
 extern bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector);
-extern int radeon_dp_mode_valid_helper(struct radeon_connector *radeon_connector,
+extern int radeon_dp_mode_valid_helper(struct drm_connector *connector,
 				       struct drm_display_mode *mode);
 extern void radeon_dp_set_link_config(struct drm_connector *connector,
 				      struct drm_display_mode *mode);
-extern void dp_link_train(struct drm_encoder *encoder,
-			  struct drm_connector *connector);
+extern void radeon_dp_link_train(struct drm_encoder *encoder,
+				 struct drm_connector *connector);
 extern u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector);
 extern bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector);
 extern void atombios_dig_encoder_setup(struct drm_encoder *encoder, int action, int panel_mode);