drm/nouveau: default to 8bpc for non-LVDS panels if EDID isn't useful

A few reports of bad behaviour since the autodetection defaulted to 6bpc,
lets fix this.

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

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 8f510fd956b0..fa860358add1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -654,10 +654,13 @@ nouveau_connector_detect_depth(struct drm_connector *connector)
         if (nv_connector->edid && connector->display_info.bpc)
                 return;
 
-        /* if not, we're out of options unless we're LVDS, default to 6bpc */
-        connector->display_info.bpc = 6;
-        if (nv_encoder->dcb->type != OUTPUT_LVDS)
+        /* if not, we're out of options unless we're LVDS, default to 8bpc */
+        if (nv_encoder->dcb->type != OUTPUT_LVDS) {
+                connector->display_info.bpc = 8;
                 return;
+        }
+
+        connector->display_info.bpc = 6;
 
         /* LVDS: panel straps */
         if (bios->fp_no_ddc) {