drm/nouveau: fix required mode bandwidth calculation for DP

This should fix eDP on certain laptops with 18-bit panels, we were rejecting
the panel's native mode due to thinking there was insufficient bandwidth
for it.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 4b286a8..0871495 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -76,6 +76,22 @@ nouveau_encoder_connector_get(struct nouveau_encoder *encoder)
        return NULL;
 }
 
+/*TODO: This could use improvement, and learn to handle the fixed
+ *      BIOS tables etc.  It's fine currently, for its only user.
+ */
+int
+nouveau_connector_bpp(struct drm_connector *connector)
+{
+       struct nouveau_connector *nv_connector = nouveau_connector(connector);
+
+       if (nv_connector->edid && nv_connector->edid->revision >= 4) {
+               u8 bpc = ((nv_connector->edid->input & 0x70) >> 3) + 4;
+               if (bpc > 4)
+                       return bpc;
+       }
+
+       return 18;
+}
 
 static void
 nouveau_connector_destroy(struct drm_connector *drm_connector)
@@ -666,7 +682,7 @@ nouveau_connector_mode_valid(struct drm_connector *connector,
                else
                        max_clock = nv_encoder->dp.link_nr * 162000;
 
-               clock *= 3;
+               clock = clock * nouveau_connector_bpp(connector) / 8;
                break;
        default:
                BUG_ON(1);

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.h b/drivers/gpu/drm/nouveau/nouveau_connector.h
index 0d2e668..c21ed6b 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.h
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.h
@@ -55,4 +55,7 @@ nouveau_connector_create(struct drm_device *, int index);
 void
 nouveau_connector_set_polling(struct drm_connector *);
 
+int
+nouveau_connector_bpp(struct drm_connector *);
+
 #endif /* __NOUVEAU_CONNECTOR_H__ */