drm/radeon/kms: fix hdmi duallink checks

All pre-SI chips are limited to 165 Mhz for single link.
Code in question will be re-enabled when SI support is added.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=44755
https://bugzilla.kernel.org/show_bug.cgi?id=42887

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_connectors.c

@@ -1057,7 +1057,7 @@ static int radeon_dvi_mode_valid(struct drm_connector *connector,
 		    (radeon_connector->connector_object_id == CONNECTOR_OBJECT_ID_HDMI_TYPE_B))
 			return MODE_OK;
 		else if (radeon_connector->connector_object_id == CONNECTOR_OBJECT_ID_HDMI_TYPE_A) {
-			if (ASIC_IS_DCE3(rdev)) {
+			if (0) {
 				/* HDMI 1.3+ supports max clock of 340 Mhz */
 				if (mode->clock > 340000)
 					return MODE_CLOCK_HIGH;

drivers/gpu/drm/radeon/radeon_encoders.c

@@ -307,8 +307,6 @@ void radeon_panel_mode_fixup(struct drm_encoder *encoder,
 bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
 				    u32 pixel_clock)
 {
-	struct drm_device *dev = encoder->dev;
-	struct radeon_device *rdev = dev->dev_private;
 	struct drm_connector *connector;
 	struct radeon_connector *radeon_connector;
 	struct radeon_connector_atom_dig *dig_connector;
@@ -326,7 +324,7 @@ bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
 	case DRM_MODE_CONNECTOR_HDMIB:
 		if (radeon_connector->use_digital) {
 			/* HDMI 1.3 supports up to 340 Mhz over single link */
-			if (ASIC_IS_DCE3(rdev) && drm_detect_hdmi_monitor(radeon_connector->edid)) {
+			if (0 && drm_detect_hdmi_monitor(radeon_connector->edid)) {
 				if (pixel_clock > 340000)
 					return true;
 				else
@@ -348,7 +346,7 @@ bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
 			return false;
 		else {
 			/* HDMI 1.3 supports up to 340 Mhz over single link */
-			if (ASIC_IS_DCE3(rdev) && drm_detect_hdmi_monitor(radeon_connector->edid)) {
+			if (0 && drm_detect_hdmi_monitor(radeon_connector->edid)) {
 				if (pixel_clock > 340000)
 					return true;
 				else