drm/nv04-nv40: Fall back to panel rescaling if we have no usable native mode.

This allows the user to set a mode larger than the native one, useful
if we had trouble finding the actual native mode (e.g. because it goes
above the hardware bandwidth limits).

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

diff --git a/drivers/gpu/drm/nouveau/nv04_dfp.c b/drivers/gpu/drm/nouveau/nv04_dfp.c
index c936403..ef23550 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv04_dfp.c
+++ b/drivers/gpu/drm/nouveau/nv04_dfp.c
@@ -185,14 +185,15 @@ static bool nv04_dfp_mode_fixup(struct drm_encoder *encoder,
        struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
        struct nouveau_connector *nv_connector = nouveau_encoder_connector_get(nv_encoder);
 
-       /* For internal panels and gpu scaling on DVI we need the native mode */
-       if (nv_connector->scaling_mode != DRM_MODE_SCALE_NONE) {
-               if (!nv_connector->native_mode)
-                       return false;
+       if (!nv_connector->native_mode ||
+           nv_connector->scaling_mode == DRM_MODE_SCALE_NONE ||
+           mode->hdisplay > nv_connector->native_mode->hdisplay ||
+           mode->vdisplay > nv_connector->native_mode->vdisplay) {
+               nv_encoder->mode = *adjusted_mode;
+
+       } else {
                nv_encoder->mode = *nv_connector->native_mode;
                adjusted_mode->clock = nv_connector->native_mode->clock;
-       } else {
-               nv_encoder->mode = *adjusted_mode;
        }
 
        return true;