drm/amd/display: send display_count msg so SMU can enter S0i2

SMU can future lower voltages in long idle case when all display is off.

If all display output is turned off via DPMS, send display_count = 0
after all output are turned off.

otherwise send display_count msg before turning on display to make sure
SMU exit S0i2 state.  before is not neccessary as we are out of S0i2
when driver execute code, but send message before anyways for correctness.

Signed-off-by: Hersen Wu <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

5 files changed, 23 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index e59e7028ad57..5745304b5af5 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -389,11 +389,19 @@ void set_dpms(
 
 	if (stream->dpms_off != dpms_off) {
 		stream->dpms_off = dpms_off;
-		if (dpms_off)
+
+		if (dpms_off) {
 			core_link_disable_stream(pipe_ctx,
 					KEEP_ACQUIRED_RESOURCE);
-		else
+
+			dc->hwss.pplib_apply_display_requirements(
+					dc, dc->current_state);
+		} else {
+			dc->hwss.pplib_apply_display_requirements(
+					dc, dc->current_state);
+
 			core_link_enable_stream(dc->current_state, pipe_ctx);
+		}
 	}
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dce100/dce100_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce100/dce100_hw_sequencer.c
index e7a694835e3e..469af0587604 100644
--- a/drivers/gpu/drm/amd/display/dc/dce100/dce100_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce100/dce100_hw_sequencer.c
@@ -148,5 +148,7 @@ void dce100_hw_sequencer_construct(struct dc *dc)
 
 	dc->hwss.enable_display_power_gating = dce100_enable_display_power_gating;
 	dc->hwss.set_bandwidth = dce100_set_bandwidth;
+	dc->hwss.pplib_apply_display_requirements =
+			dce100_pplib_apply_display_requirements;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 1ec008404784..d22745e6dff0 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -2595,6 +2595,10 @@ void dce110_fill_display_configs(
 
 		ASSERT(pipe_ctx != NULL);
 
+		/* only notify active stream */
+		if (stream->dpms_off)
+			continue;
+
 		num_cfgs++;
 		cfg->signal = pipe_ctx->stream->signal;
 		cfg->pipe_idx = pipe_ctx->pipe_idx;
@@ -3024,6 +3028,7 @@ static const struct hw_sequencer_funcs dce110_funcs = {
 	.wait_for_mpcc_disconnect = dce110_wait_for_mpcc_disconnect,
 	.ready_shared_resources = ready_shared_resources,
 	.optimize_shared_resources = optimize_shared_resources,
+	.pplib_apply_display_requirements = pplib_apply_display_requirements,
 	.edp_backlight_control = hwss_edp_backlight_control,
 	.edp_power_control = hwss_edp_power_control,
 };
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 5d1fb1c297a3..73e7afb360b1 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -2567,6 +2567,8 @@ static const struct hw_sequencer_funcs dcn10_funcs = {
 	.wait_for_mpcc_disconnect = dcn10_wait_for_mpcc_disconnect,
 	.ready_shared_resources = ready_shared_resources,
 	.optimize_shared_resources = optimize_shared_resources,
+	.pplib_apply_display_requirements =
+			dcn10_pplib_apply_display_requirements,
 	.edp_backlight_control = hwss_edp_backlight_control,
 	.edp_power_control = hwss_edp_power_control
 };
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
index 19cfca91bb4e..1d8852683f1f 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
@@ -183,12 +183,16 @@ struct hw_sequencer_funcs {
 
 	void (*ready_shared_resources)(struct dc *dc, struct dc_state *context);
 	void (*optimize_shared_resources)(struct dc *dc);
+	void (*pplib_apply_display_requirements)(
+			struct dc *dc,
+			struct dc_state *context);
 	void (*edp_power_control)(
 			struct dc_link *link,
 			bool enable);
 	void (*edp_backlight_control)(
 			struct dc_link *link,
 			bool enable);
+
 };
 
 void color_space_to_black_color(