drm/amd/display: Add helper for blanking all dp displays

[Why & How]
The codes to blank all dp display have been called many times,
so add a helper in dc_link to make it more concise.
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -1906,6 +1906,51 @@ static enum dc_status enable_link_dp_mst(
 	return enable_link_dp(state, pipe_ctx);
 }
 
+void blank_all_dp_displays(struct dc *dc, bool hw_init)
+{
+	unsigned int i, j, fe;
+	uint8_t dpcd_power_state = '\0';
+	enum dc_status status = DC_ERROR_UNEXPECTED;
+
+	for (i = 0; i < dc->link_count; i++) {
+		enum signal_type signal = dc->links[i]->connector_signal;
+
+		if ((signal == SIGNAL_TYPE_EDP) ||
+			(signal == SIGNAL_TYPE_DISPLAY_PORT)) {
+			if (hw_init && signal != SIGNAL_TYPE_EDP) {
+				/* DP 2.0 spec requires that we read LTTPR caps first */
+				dp_retrieve_lttpr_cap(dc->links[i]);
+				/* 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 ((signal != SIGNAL_TYPE_EDP && status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0) ||
+				(!hw_init && dc->links[i]->link_enc->funcs->is_dig_enabled(dc->links[i]->link_enc))) {
+				if (dc->links[i]->ep_type == DISPLAY_ENDPOINT_PHY &&
+						dc->links[i]->link_enc->funcs->get_dig_frontend) {
+					fe = dc->links[i]->link_enc->funcs->get_dig_frontend(dc->links[i]->link_enc);
+					if (fe == ENGINE_ID_UNKNOWN)
+						continue;
+
+					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->links[i],
+									dc->res_pool->stream_enc[j]);
+							break;
+						}
+					}
+				}
+
+				if (!dc->links[i]->wa_flags.dp_keep_receiver_powered ||
+					(hw_init && signal != SIGNAL_TYPE_EDP))
+					dp_receiver_power_ctrl(dc->links[i], false);
+			}
+		}
+	}
+
+}
+
 static bool get_ext_hdmi_settings(struct pipe_ctx *pipe_ctx,
 		enum engine_id eng_id,
 		struct ext_hdmi_settings *settings)

drivers/gpu/drm/amd/display/dc/dc_link.h

@@ -277,6 +277,7 @@ bool dc_link_setup_psr(struct dc_link *dc_link,
 		struct psr_context *psr_context);
 
 void dc_link_get_psr_residency(const struct dc_link *link, uint32_t *residency);
+void blank_all_dp_displays(struct dc *dc, bool hw_init);
 
 /* Request DC to detect if there is a Panel connected.
  * boot - If this call is during initial boot.

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -1649,31 +1649,13 @@ static enum dc_status apply_single_controller_ctx_to_hw(
 
 static void power_down_encoders(struct dc *dc)
 {
-	int i, j;
+	int i;
+
+	blank_all_dp_displays(dc, false);
 
 	for (i = 0; i < dc->link_count; i++) {
 		enum signal_type signal = dc->links[i]->connector_signal;
 
-		if ((signal == SIGNAL_TYPE_EDP) ||
-			(signal == SIGNAL_TYPE_DISPLAY_PORT)) {
-			if (dc->links[i]->link_enc->funcs->get_dig_frontend &&
-				dc->links[i]->link_enc->funcs->is_dig_enabled(dc->links[i]->link_enc)) {
-				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->links[i],
-									dc->res_pool->stream_enc[j]);
-						break;
-					}
-				}
-			}
-
-			if (!dc->links[i]->wa_flags.dp_keep_receiver_powered)
-				dp_receiver_power_ctrl(dc->links[i], false);
-		}
-
 		if (signal != SIGNAL_TYPE_EDP)
 			signal = SIGNAL_TYPE_NONE;
 

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -1366,7 +1366,7 @@ void dcn10_init_pipes(struct dc *dc, struct dc_state *context)
 
 void dcn10_init_hw(struct dc *dc)
 {
-	int i, j;
+	int i;
 	struct abm *abm = dc->res_pool->abm;
 	struct dmcu *dmcu = dc->res_pool->dmcu;
 	struct dce_hwseq *hws = dc->hwseq;
@@ -1462,43 +1462,8 @@ void dcn10_init_hw(struct dc *dc)
 		dmub_enable_outbox_notification(dc);
 
 	/* we want to turn off all dp displays before doing detection */
-	if (dc->config.power_down_display_on_boot) {
-		uint8_t dpcd_power_state = '\0';
-		enum dc_status status = DC_ERROR_UNEXPECTED;
-
-		for (i = 0; i < dc->link_count; i++) {
-			if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)
-				continue;
-
-			/* DP 2.0 requires that LTTPR Caps be read first */
-			dp_retrieve_lttpr_cap(dc->links[i]);
-
-			/*
-			 * 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.
-			 */
-			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->links[i],
-										dc->res_pool->stream_enc[j]);
-							break;
-						}
-					}
-				}
-				dp_receiver_power_ctrl(dc->links[i], false);
-			}
-		}
-	}
+	if (dc->config.power_down_display_on_boot)
+		blank_all_dp_displays(dc, true);
 
 	/* If taking control over from VBIOS, we may want to optimize our first
 	 * mode set, so we need to skip powering down pipes until we know which

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c

@@ -437,7 +437,7 @@ void dcn30_init_hw(struct dc *dc)
 	struct dce_hwseq *hws = dc->hwseq;
 	struct dc_bios *dcb = dc->ctx->dc_bios;
 	struct resource_pool *res_pool = dc->res_pool;
-	int i, j;
+	int i;
 	int edp_num;
 	uint32_t backlight = MAX_BACKLIGHT_LEVEL;
 
@@ -534,41 +534,8 @@ void dcn30_init_hw(struct dc *dc)
 			hws->funcs.dsc_pg_control(hws, res_pool->dscs[i]->inst, false);
 
 	/* we want to turn off all dp displays before doing detection */
-	if (dc->config.power_down_display_on_boot) {
-		uint8_t dpcd_power_state = '\0';
-		enum dc_status status = DC_ERROR_UNEXPECTED;
-
-		for (i = 0; i < dc->link_count; i++) {
-			if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)
-				continue;
-			/* DP 2.0 states that LTTPR regs must be read first */
-			dp_retrieve_lttpr_cap(dc->links[i]);
-
-			/* 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;
-
-					fe = dc->links[i]->link_enc->funcs->get_dig_frontend(
-										dc->links[i]->link_enc);
-					if (fe == ENGINE_ID_UNKNOWN)
-						continue;
-
-					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->links[i],
-										dc->res_pool->stream_enc[j]);
-							break;
-						}
-					}
-				}
-				dp_receiver_power_ctrl(dc->links[i], false);
-			}
-		}
-	}
+	if (dc->config.power_down_display_on_boot)
+		blank_all_dp_displays(dc, true);
 
 	/* If taking control over from VBIOS, we may want to optimize our first
 	 * mode set, so we need to skip powering down pipes until we know which

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

@@ -71,7 +71,7 @@ void dcn31_init_hw(struct dc *dc)
 	struct dc_bios *dcb = dc->ctx->dc_bios;
 	struct resource_pool *res_pool = dc->res_pool;
 	uint32_t backlight = MAX_BACKLIGHT_LEVEL;
-	int i, j;
+	int i;
 	int edp_num;
 
 	if (dc->clk_mgr && dc->clk_mgr->funcs->init_clocks)
@@ -175,40 +175,9 @@ void dcn31_init_hw(struct dc *dc)
 			hws->funcs.dsc_pg_control(hws, res_pool->dscs[i]->inst, false);
 
 	/* we want to turn off all dp displays before doing detection */
-	if (dc->config.power_down_display_on_boot) {
-		uint8_t dpcd_power_state = '\0';
-		enum dc_status status = DC_ERROR_UNEXPECTED;
-
-		for (i = 0; i < dc->link_count; i++) {
-			if (dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)
-				continue;
-
-			/* 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]->ep_type == DISPLAY_ENDPOINT_PHY &&
-						dc->links[i]->link_enc->funcs->get_dig_frontend) {
-					unsigned int fe;
-
-					fe = dc->links[i]->link_enc->funcs->get_dig_frontend(
-										dc->links[i]->link_enc);
-					if (fe == ENGINE_ID_UNKNOWN)
-						continue;
-
-					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->links[i],
-										dc->res_pool->stream_enc[j]);
-							break;
-						}
-					}
-				}
-				dp_receiver_power_ctrl(dc->links[i], false);
-			}
-		}
-	}
+	if (dc->config.power_down_display_on_boot)
+		blank_all_dp_displays(dc, true);
+
 
 	/* If taking control over from VBIOS, we may want to optimize our first
 	 * mode set, so we need to skip powering down pipes until we know which