diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c index 9f41efddc9bc5b817eec6653cc7ed1da3768495d..4a081e544123a0b731a40a3dcbb41e5d966d9357 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c @@ -1333,30 +1333,28 @@ void dcn10_init_hw(struct dc *dc) continue; /* - * core_link_read_dpcd() will invoke dm_helpers_dp_read_dpcd(), - * which needs to read dpcd info with the help of aconnector. - * If aconnector (dc->links[i]->prev) is NULL, then dpcd status - * cannot be read. + * If any of the displays are lit up turn them off. + * The reason is that some MST hubs cannot be turned off + * completely until we tell them to do so. + * If not turned off, then displays connected to MST hub + * won't light up. */ - if (dc->links[i]->priv) { - /* if any of the displays are lit up turn them off */ - status = core_link_read_dpcd(dc->links[i], DP_SET_POWER, - &dpcd_power_state, sizeof(dpcd_power_state)); - if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0) { - /* blank dp stream before power off receiver*/ - if (dc->links[i]->link_enc->funcs->get_dig_frontend) { - unsigned int fe = dc->links[i]->link_enc->funcs->get_dig_frontend(dc->links[i]->link_enc); - - for (j = 0; j < dc->res_pool->stream_enc_count; j++) { - if (fe == dc->res_pool->stream_enc[j]->id) { - dc->res_pool->stream_enc[j]->funcs->dp_blank( - dc->res_pool->stream_enc[j]); - break; - } + status = core_link_read_dpcd(dc->links[i], DP_SET_POWER, + &dpcd_power_state, sizeof(dpcd_power_state)); + if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0) { + /* blank dp stream before power off receiver*/ + if (dc->links[i]->link_enc->funcs->get_dig_frontend) { + unsigned int fe = dc->links[i]->link_enc->funcs->get_dig_frontend(dc->links[i]->link_enc); + + for (j = 0; j < dc->res_pool->stream_enc_count; j++) { + if (fe == dc->res_pool->stream_enc[j]->id) { + dc->res_pool->stream_enc[j]->funcs->dp_blank( + dc->res_pool->stream_enc[j]); + break; } } - dp_receiver_power_ctrl(dc->links[i], false); } + dp_receiver_power_ctrl(dc->links[i], false); } } }