drm/nouveau: Reject modes exceeding the integrated TMDS maximum bandwidth.

Reported-by: Grzesiek Sójka <pld@pfu.pl>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 21 insertions, 6 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 0871495096fa..6208eedc0970 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -641,11 +641,28 @@ nouveau_connector_get_modes(struct drm_connector *connector)
         return ret;
 }
 
+static unsigned
+get_tmds_link_bandwidth(struct drm_connector *connector)
+{
+        struct nouveau_connector *nv_connector = nouveau_connector(connector);
+        struct drm_nouveau_private *dev_priv = connector->dev->dev_private;
+        struct dcb_entry *dcb = nv_connector->detected_encoder->dcb;
+
+        if (dcb->location != DCB_LOC_ON_CHIP ||
+            dev_priv->chipset >= 0x46)
+                return 165000;
+        else if (dev_priv->chipset >= 0x40)
+                return 155000;
+        else if (dev_priv->chipset >= 0x18)
+                return 135000;
+        else
+                return 112000;
+}
+
 static int
 nouveau_connector_mode_valid(struct drm_connector *connector,
                              struct drm_display_mode *mode)
 {
-        struct drm_nouveau_private *dev_priv = connector->dev->dev_private;
         struct nouveau_connector *nv_connector = nouveau_connector(connector);
         struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
         struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
@@ -663,11 +680,9 @@ nouveau_connector_mode_valid(struct drm_connector *connector,
                 max_clock = 400000;
                 break;
         case OUTPUT_TMDS:
-                if ((dev_priv->card_type >= NV_50 && !nouveau_duallink) ||
-                    !nv_encoder->dcb->duallink_possible)
-                        max_clock = 165000;
-                else
-                        max_clock = 330000;
+                max_clock = get_tmds_link_bandwidth(connector);
+                if (nouveau_duallink && nv_encoder->dcb->duallink_possible)
+                        max_clock *= 2;
                 break;
         case OUTPUT_ANALOG:
                 max_clock = nv_encoder->dcb->crtconf.maxfreq;