drm/amd/display: add eDP 1.2+ polling for T7

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -123,6 +123,28 @@ bool edp_receiver_ready_T9(struct dc_link *link)
 	} while (++tries < 50);
 	return result;
 }
+bool edp_receiver_ready_T7(struct dc_link *link)
+{
+	unsigned int tries = 0;
+	unsigned char sinkstatus = 0;
+	unsigned char edpRev = 0;
+	enum dc_status result = DC_OK;
+
+	result = core_link_read_dpcd(link, DP_EDP_DPCD_REV, &edpRev, sizeof(edpRev));
+	if (result == DC_OK && edpRev < DP_EDP_12)
+		return true;
+	/* start from eDP version 1.2, SINK_STAUS indicate the sink is ready.*/
+	do {
+		sinkstatus = 0;
+		result = core_link_read_dpcd(link, DP_SINK_STATUS, &sinkstatus, sizeof(sinkstatus));
+		if (sinkstatus == 1)
+			break;
+		if (result != DC_OK)
+			break;
+		udelay(25); //MAx T7 is 50ms
+	} while (++tries < 300);
+	return result;
+}
 
 void dp_disable_link_phy(struct dc_link *link, enum signal_type signal)
 {

drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c

@@ -920,6 +920,7 @@ static void dce110_stream_encoder_dp_blank(
 {
 	struct dce110_stream_encoder *enc110 = DCE110STRENC_FROM_STRENC(enc);
 	uint32_t retries = 0;
+	uint32_t  reg1 = 0;
 	uint32_t max_retries = DP_BLANK_MAX_RETRY * 10;
 
 	/* Note: For CZ, we are changing driver default to disable
@@ -928,7 +929,10 @@ static void dce110_stream_encoder_dp_blank(
 	 * handful of panels that cannot handle disable stream at
 	 * HBLANK and will result in a white line flash across the
 	 * screen on stream disable. */
-
+	REG_GET(DP_VID_STREAM_CNTL, DP_VID_STREAM_ENABLE, &reg1);
+	if ((reg1 & 0x1) == 0)
+		/*stream not enabled*/
+		return;
 	/* Specify the video stream disable point
 	 * (2 = start of the next vertical blank) */
 	REG_UPDATE(DP_VID_STREAM_CNTL, DP_VID_STREAM_DIS_DEFER, 2);

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

@@ -927,9 +927,13 @@ void hwss_edp_backlight_control(
 	 * Enable it in the future if necessary.
 	 */
 	/* dc_service_sleep_in_milliseconds(50); */
+		/*edp 1.2*/
+	if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_ON)
+		edp_receiver_ready_T7(link);
 	link_transmitter_control(ctx->dc_bios, &cntl);
 	/*edp 1.2*/
-	edp_receiver_ready_T9(link);
+	if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_OFF)
+		edp_receiver_ready_T9(link);
 }
 
 void dce110_disable_stream(struct pipe_ctx *pipe_ctx, int option)
@@ -976,9 +980,6 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx, int option)
 		 */
 	}
 
-	/* blank at encoder level */
-	if (dc_is_dp_signal(pipe_ctx->stream->signal))
-		pipe_ctx->stream_res.stream_enc->funcs->dp_blank(pipe_ctx->stream_res.stream_enc);
 
 	link->link_enc->funcs->connect_dig_be_to_fe(
 			link->link_enc,

drivers/gpu/drm/amd/display/dc/inc/link_hwss.h

@@ -52,6 +52,7 @@ void dp_enable_link_phy(
 
 void dp_receiver_power_ctrl(struct dc_link *link, bool on);
 bool edp_receiver_ready_T9(struct dc_link *link);
+bool edp_receiver_ready_T7(struct dc_link *link);
 
 void dp_disable_link_phy(struct dc_link *link, enum signal_type signal);