drm/amd/display: Disable eDP with a proper sequence.

Proper sequence should be:
disable backlight
dp blank
disable output
edp power off

In enable accelatate mode, all the encoder and controller
are disabled, so move disable eDP to the function is the
easiest way to implement.
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@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.c

@@ -649,31 +649,6 @@ bool dc_enable_stereo(
 	return ret;
 }
 
-static void disable_eDP_not_in_use(struct dc *dc, struct dc_state *context)
-{
-	int i;
-	struct dc_link *link = NULL;
-
-	/* check if eDP panel is suppose to be set mode, if yes, no need to disable */
-	for (i = 0; i < context->stream_count; i++) {
-		if (context->streams[i]->signal == SIGNAL_TYPE_EDP)
-			return;
-	}
-
-	/* check if there is an eDP panel not in use */
-	for (i = 0; i < dc->link_count; i++) {
-		if (dc->links[i]->local_sink &&
-			dc->links[i]->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
-			link = dc->links[i];
-			break;
-		}
-	}
-
-	if (link) {
-		dc->hwss.edp_backlight_control(link, false);
-		dc->hwss.edp_power_control(link, false);
-	}
-}
 /*
  * Applies given context to HW and copy it into current context.
  * It's up to the user to release the src context afterwards.
@@ -691,10 +666,8 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
 	for (i = 0; i < context->stream_count; i++)
 		dc_streams[i] =  context->streams[i];
 
-	if (!dcb->funcs->is_accelerated_mode(dcb)) {
-		dc->hwss.enable_accelerated_mode(dc);
-		disable_eDP_not_in_use(dc, context);
-	}
+	if (!dcb->funcs->is_accelerated_mode(dcb))
+		dc->hwss.enable_accelerated_mode(dc, context);
 
 	/* re-program planes for existing stream, in case we need to
 	 * free up plane resource for later use

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

@@ -1407,6 +1407,31 @@ static void disable_vga_and_power_gate_all_controllers(
 	}
 }
 
+static struct dc_link *get_link_for_eDP_not_in_use(
+		struct dc *dc,
+		struct dc_state *context)
+{
+	int i;
+	struct dc_link *link = NULL;
+
+	/* check if eDP panel is suppose to be set mode, if yes, no need to disable */
+	for (i = 0; i < context->stream_count; i++) {
+		if (context->streams[i]->signal == SIGNAL_TYPE_EDP)
+			return NULL;
+	}
+
+	/* check if there is an eDP panel not in use */
+	for (i = 0; i < dc->link_count; i++) {
+		if (dc->links[i]->local_sink &&
+			dc->links[i]->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
+			link = dc->links[i];
+			break;
+		}
+	}
+
+	return link;
+}
+
 /**
  * When ASIC goes from VBIOS/VGA mode to driver/accelerated mode we need:
  *  1. Power down all DC HW blocks
@@ -1414,11 +1439,19 @@ static void disable_vga_and_power_gate_all_controllers(
  *  3. Enable power gating for controller
  *  4. Set acc_mode_change bit (VBIOS will clear this bit when going to FSDOS)
  */
-void dce110_enable_accelerated_mode(struct dc *dc)
+void dce110_enable_accelerated_mode(struct dc *dc, struct dc_state *context)
 {
-	power_down_all_hw_blocks(dc);
+	struct dc_link *eDP_link_to_turnoff = get_link_for_eDP_not_in_use(dc, context);
 
+	if (eDP_link_to_turnoff)
+		dc->hwss.edp_backlight_control(eDP_link_to_turnoff, false);
+
+	power_down_all_hw_blocks(dc);
 	disable_vga_and_power_gate_all_controllers(dc);
+
+	if (eDP_link_to_turnoff)
+		dc->hwss.edp_power_control(eDP_link_to_turnoff, false);
+
 	bios_set_scratch_acc_mode_change(dc->ctx->dc_bios);
 }
 

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

@@ -55,7 +55,7 @@ void dce110_unblank_stream(struct pipe_ctx *pipe_ctx,
 void dce110_update_info_frame(struct pipe_ctx *pipe_ctx);
 
 void dce110_set_avmute(struct pipe_ctx *pipe_ctx, bool enable);
-void dce110_enable_accelerated_mode(struct dc *dc);
+void dce110_enable_accelerated_mode(struct dc *dc, struct dc_state *context);
 
 void dce110_power_down(struct dc *dc);
 

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

@@ -114,7 +114,7 @@ struct hw_sequencer_funcs {
 
 	void (*power_down)(struct dc *dc);
 
-	void (*enable_accelerated_mode)(struct dc *dc);
+	void (*enable_accelerated_mode)(struct dc *dc, struct dc_state *context);
 
 	void (*enable_timing_synchronization)(
 			struct dc *dc,