drm/nouveau/disp: take sink support into account for exposing 594mhz

Scrambling is required for supporting any mode over 340MHz. If it's not
supported, reject any modes that would require it.
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_connector.c

@@ -969,18 +969,33 @@ nouveau_connector_get_modes(struct drm_connector *connector)
 }
 
 static unsigned
-get_tmds_link_bandwidth(struct drm_connector *connector, bool hdmi)
+get_tmds_link_bandwidth(struct drm_connector *connector)
 {
 	struct nouveau_connector *nv_connector = nouveau_connector(connector);
+	struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct dcb_output *dcb = nv_connector->detected_encoder->dcb;
+	struct drm_display_info *info = NULL;
+	const unsigned duallink_scale =
+		nouveau_duallink && nv_encoder->dcb->duallink_possible ? 2 : 1;
+
+	if (drm_detect_hdmi_monitor(nv_connector->edid))
+		info = &nv_connector->base.display_info;
 
-	if (hdmi) {
+	if (info) {
 		if (nouveau_hdmimhz > 0)
 			return nouveau_hdmimhz * 1000;
 		/* Note: these limits are conservative, some Fermi's
 		 * can do 297 MHz. Unclear how this can be determined.
 		 */
+		if (drm->client.device.info.chipset >= 0x120) {
+			const int max_tmds_clock =
+				info->hdmi.scdc.scrambling.supported ?
+				594000 : 340000;
+			return info->max_tmds_clock ?
+				min(info->max_tmds_clock, max_tmds_clock) :
+				max_tmds_clock;
+		}
 		if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_KEPLER)
 			return 297000;
 		if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_FERMI)
@@ -988,13 +1003,13 @@ get_tmds_link_bandwidth(struct drm_connector *connector, bool hdmi)
 	}
 	if (dcb->location != DCB_LOC_ON_CHIP ||
 	    drm->client.device.info.chipset >= 0x46)
-		return 165000;
+		return 165000 * duallink_scale;
 	else if (drm->client.device.info.chipset >= 0x40)
-		return 155000;
+		return 155000 * duallink_scale;
 	else if (drm->client.device.info.chipset >= 0x18)
-		return 135000;
+		return 135000 * duallink_scale;
 	else
-		return 112000;
+		return 112000 * duallink_scale;
 }
 
 static enum drm_mode_status
@@ -1006,7 +1021,6 @@ nouveau_connector_mode_valid(struct drm_connector *connector,
 	struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
 	unsigned min_clock = 25000, max_clock = min_clock;
 	unsigned clock = mode->clock;
-	bool hdmi;
 
 	switch (nv_encoder->dcb->type) {
 	case DCB_OUTPUT_LVDS:
@@ -1019,11 +1033,7 @@ nouveau_connector_mode_valid(struct drm_connector *connector,
 		max_clock = 400000;
 		break;
 	case DCB_OUTPUT_TMDS:
-		hdmi = drm_detect_hdmi_monitor(nv_connector->edid);
-		max_clock = get_tmds_link_bandwidth(connector, hdmi);
-		if (!hdmi && nouveau_duallink &&
-		    nv_encoder->dcb->duallink_possible)
-			max_clock *= 2;
+		max_clock = get_tmds_link_bandwidth(connector);
 		break;
 	case DCB_OUTPUT_ANALOG:
 		max_clock = nv_encoder->dcb->crtconf.maxfreq;