drm/amd/display: Don't read EDID in atomic_check

We shouldn't attempt to read EDID in atomic_check. We really shouldn't
even be modifying the connector object, or any other non-state object,
but this is a start at least.

Moving EDID cleanup to dm_dp_mst_connector_destroy from
dm_dp_destroy_mst_connector to ensure the EDID is still available for
headless mode.

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

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 8291d74..305292a 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -161,6 +161,11 @@ dm_dp_mst_connector_destroy(struct drm_connector *connector)
        struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
        struct amdgpu_encoder *amdgpu_encoder = amdgpu_dm_connector->mst_encoder;
 
+       if (amdgpu_dm_connector->edid) {
+               kfree(amdgpu_dm_connector->edid);
+               amdgpu_dm_connector->edid = NULL;
+       }
+
        drm_encoder_cleanup(&amdgpu_encoder->base);
        kfree(amdgpu_encoder);
        drm_connector_cleanup(connector);
@@ -181,28 +186,22 @@ static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
 void dm_dp_mst_dc_sink_create(struct drm_connector *connector)
 {
        struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
-       struct edid *edid;
        struct dc_sink *dc_sink;
        struct dc_sink_init_data init_params = {
                        .link = aconnector->dc_link,
                        .sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
 
+       /* FIXME none of this is safe. we shouldn't touch aconnector here in
+        * atomic_check
+        */
+
        /*
         * TODO: Need to further figure out why ddc.algo is NULL while MST port exists
         */
        if (!aconnector->port || !aconnector->port->aux.ddc.algo)
                return;
 
-       edid = drm_dp_mst_get_edid(connector, &aconnector->mst_port->mst_mgr, aconnector->port);
-
-       if (!edid) {
-               drm_mode_connector_update_edid_property(
-                       &aconnector->base,
-                       NULL);
-               return;
-       }
-
-       aconnector->edid = edid;
+       ASSERT(aconnector->edid);
 
        dc_sink = dc_link_add_remote_sink(
                aconnector->dc_link,
@@ -215,9 +214,6 @@ void dm_dp_mst_dc_sink_create(struct drm_connector *connector)
 
        amdgpu_dm_add_sink_to_freesync_module(
                        connector, aconnector->edid);
-
-       drm_mode_connector_update_edid_property(
-                                       &aconnector->base, aconnector->edid);
 }
 
 static int dm_dp_mst_get_modes(struct drm_connector *connector)
@@ -424,14 +420,6 @@ static void dm_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
                dc_sink_release(aconnector->dc_sink);
                aconnector->dc_sink = NULL;
        }
-       if (aconnector->edid) {
-               kfree(aconnector->edid);
-               aconnector->edid = NULL;
-       }
-
-       drm_mode_connector_update_edid_property(
-                       &aconnector->base,
-                       NULL);
 
        aconnector->mst_connected = false;
 }