drm/amd/display: Avoid calling blank_stream() twice

[Why]
We've made fix for garbage in dcn31_reset_back_end_for_pipe(), adding
blank_stream() before disable_crtc(). And set_dpms_off() will call
blank_stream() again.

[How]
Add flag to avoid calling blank_stream() twice.

Reviewed-by: Nicholas Kazlauskas <[email protected]>
Signed-off-by: Zhongwei Zhang <[email protected]>
Signed-off-by: Wayne Lin <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Zhongwei Zhang

drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c

@@ -1221,6 +1221,9 @@ void dce110_blank_stream(struct pipe_ctx *pipe_ctx)
 	struct dc_link *link = stream->link;
 	struct dce_hwseq *hws = link->dc->hwseq;
 
+	if (hws && hws->wa_state.skip_blank_stream)
+		return;
+
 	if (link->local_sink && link->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
 		if (!link->skip_implict_edp_power_control)
 			hws->funcs.edp_backlight_control(link, false);

drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c

@@ -526,9 +526,15 @@ static void dcn31_reset_back_end_for_pipe(
 
 	link = pipe_ctx->stream->link;
 
+	if (dc->hwseq)
+		dc->hwseq->wa_state.skip_blank_stream = false;
+
 	if ((!pipe_ctx->stream->dpms_off || link->link_status.link_active) &&
-		(link->connector_signal == SIGNAL_TYPE_EDP))
+		(link->connector_signal == SIGNAL_TYPE_EDP)) {
 		dc->hwss.blank_stream(pipe_ctx);
+		if (dc->hwseq)
+			dc->hwseq->wa_state.skip_blank_stream = true;
+	}
 
 	pipe_ctx->stream_res.tg->funcs->set_dsc_config(
 			pipe_ctx->stream_res.tg,
@@ -570,7 +576,8 @@ static void dcn31_reset_back_end_for_pipe(
 			pipe_ctx->stream_res.audio = NULL;
 		}
 	}
-
+	if (dc->hwseq)
+		dc->hwseq->wa_state.skip_blank_stream = false;
 	pipe_ctx->stream = NULL;
 	DC_LOG_DEBUG("Reset back end for pipe %d, tg:%d\n",
 					pipe_ctx->pipe_idx, pipe_ctx->stream_res.tg->inst);

drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer_private.h

@@ -49,6 +49,7 @@ struct hwseq_wa_state {
 	bool DEGVIDCN10_253_applied;
 	bool disallow_self_refresh_during_multi_plane_transition_applied;
 	unsigned int disallow_self_refresh_during_multi_plane_transition_applied_on_frame;
+	bool skip_blank_stream;
 };
 
 struct pipe_ctx;