drm/amd/display: blank dp stream before power off receiver

[why]
power off dp receiver directly cause garbage during hw init

[how]
blank dp stream and then power off receiver

Signed-off-by: Xiaodong Yan <Xiaodong.Yan@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 dad95f1..079a33a 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1328,6 +1328,14 @@ void dcn10_init_hw(struct dc *dc)
                uint8_t dpcd_power_state = '\0';
                enum dc_status status = DC_ERROR_UNEXPECTED;
 
+               /* blank all dp streams before power off receiver,
+                * this should only impact DP
+                */
+               for (i = 0; i < dc->res_pool->stream_enc_count; i++) {
+                       dc->res_pool->stream_enc[i]->funcs->dp_blank(
+                                               dc->res_pool->stream_enc[i]);
+               }
+
                for (i = 0; i < dc->link_count; i++) {
                        if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)
                                continue;