drm/amd/display: Make atomic-check validate underscan changes

When the underscan state was changed, atomic-check was triggering a
validation but passing the old underscan values.  This change adds a
somewhat hacky check in dm_update_crtcs_state that will update the
stream if old and newunderscan values are different.
This was causing 4k on Fiji to allow underscan when it wasn't permitted.

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 16 insertions, 7 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index ad1ad333012a..1a7e96ee6051 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4555,8 +4555,8 @@ static int dm_update_crtcs_state(struct dc *dc,
         for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                 struct amdgpu_crtc *acrtc = NULL;
                 struct amdgpu_dm_connector *aconnector = NULL;
-                struct drm_connector_state *new_con_state = NULL;
-                struct dm_connector_state *dm_conn_state = NULL;
+                struct drm_connector_state *drm_new_conn_state = NULL, *drm_old_conn_state = NULL;
+                struct dm_connector_state *dm_new_conn_state = NULL, *dm_old_conn_state = NULL;
                 struct drm_plane_state *new_plane_state = NULL;
 
                 new_stream = NULL;
@@ -4577,19 +4577,23 @@ static int dm_update_crtcs_state(struct dc *dc,
                 /* TODO This hack should go away */
                 if (aconnector && enable) {
                         // Make sure fake sink is created in plug-in scenario
-                        new_con_state = drm_atomic_get_connector_state(state,
+                        drm_new_conn_state = drm_atomic_get_new_connector_state(state,
                                                                     &aconnector->base);
+                        drm_old_conn_state = drm_atomic_get_old_connector_state(state,
+                                                                    &aconnector->base);
 
-                        if (IS_ERR(new_con_state)) {
-                                ret = PTR_ERR_OR_ZERO(new_con_state);
+
+                        if (IS_ERR(drm_new_conn_state)) {
+                                ret = PTR_ERR_OR_ZERO(drm_new_conn_state);
                                 break;
                         }
 
-                        dm_conn_state = to_dm_connector_state(new_con_state);
+                        dm_new_conn_state = to_dm_connector_state(drm_new_conn_state);
+                        dm_old_conn_state = to_dm_connector_state(drm_old_conn_state);
 
                         new_stream = create_stream_for_sink(aconnector,
                                                              &new_crtc_state->mode,
-                                                            dm_conn_state);
+                                                            dm_new_conn_state);
 
                         /*
                          * we can have no stream on ACTION_SET if a display
@@ -4708,6 +4712,11 @@ next_crtc:
                  */
                 BUG_ON(dm_new_crtc_state->stream == NULL);
 
+                /* Scaling or underscan settings */
+                if (is_scaling_state_different(dm_old_conn_state, dm_new_conn_state))
+                        update_stream_scaling_settings(
+                                &new_crtc_state->mode, dm_new_conn_state, dm_new_crtc_state->stream);
+
                 /* Color managment settings */
                 if (dm_new_crtc_state->base.color_mgmt_changed) {
                         ret = amdgpu_dm_set_regamma_lut(dm_new_crtc_state);