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>

1 files changed, 22 insertions, 12 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index a22f4fd03a06..fd80661dff92 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/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;