Higher layers tend to add a lot of modes not actually in the EDID, such as the standard DMT modes. Changing this would be extremely intrusive to everyone, so just force the scaler more often. There are no practical cases we're aware of where a LVDS/eDP panel has multiple resolutions exposed, and i915 already does it this way.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110660 Signed-off-by: Ilia Mirkin imirkin@alum.mit.edu ---
Untested for now, hoping that the bugzilla filer will test it out. Seems obvious though.
drivers/gpu/drm/nouveau/dispnv50/disp.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index 134701a837c8..ef8d7a71564a 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -322,8 +322,13 @@ nv50_outp_atomic_check_view(struct drm_encoder *encoder, switch (connector->connector_type) { case DRM_MODE_CONNECTOR_LVDS: case DRM_MODE_CONNECTOR_eDP: - /* Force use of scaler for non-EDID modes. */ - if (adjusted_mode->type & DRM_MODE_TYPE_DRIVER) + /* Don't force scaler for EDID modes with + * same size as the native one (e.g. different + * refresh rate) + */ + if (adjusted_mode->hdisplay == native_mode->hdisplay && + adjusted_mode->vdisplay == native_mode->vdisplay && + adjusted_mode->type & DRM_MODE_TYPE_DRIVER) break; mode = native_mode; asyc->scaler.full = true;