drm/amd/display: fix brightness level after resume from suspend

Adding missing call to cache current backlight values.
Otherwise the brightness resets to default value on resume.
Signed-off-by: Roman Li <Roman.Li@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.c

@@ -1997,6 +1997,19 @@ bool dc_link_set_backlight_level(const struct dc_link *link, uint32_t level,
 	return true;
 }
 
+bool dc_link_set_abm_disable(const struct dc_link *link)
+{
+	struct dc  *core_dc = link->ctx->dc;
+	struct abm *abm = core_dc->res_pool->abm;
+
+	if ((abm == NULL) || (abm->funcs->set_backlight_level == NULL))
+		return false;
+
+	abm->funcs->set_abm_immediate_disable(abm);
+
+	return true;
+}
+
 bool dc_link_set_psr_enable(const struct dc_link *link, bool enable, bool wait)
 {
 	struct dc  *core_dc = link->ctx->dc;

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

@@ -132,6 +132,8 @@ static inline struct dc_link *dc_get_link_at_index(struct dc *dc, uint32_t link_
 bool dc_link_set_backlight_level(const struct dc_link *dc_link, uint32_t level,
 		uint32_t frame_ramp, const struct dc_stream_state *stream);
 
+bool dc_link_set_abm_disable(const struct dc_link *dc_link);
+
 bool dc_link_set_psr_enable(const struct dc_link *dc_link, bool enable, bool wait);
 
 bool dc_link_get_psr_state(const struct dc_link *dc_link, uint32_t *psr_state);

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

@@ -1016,8 +1016,10 @@ void dce110_blank_stream(struct pipe_ctx *pipe_ctx)
 	struct dc_stream_state *stream = pipe_ctx->stream;
 	struct dc_link *link = stream->sink->link;
 
-	if (link->local_sink && link->local_sink->sink_signal == SIGNAL_TYPE_EDP)
+	if (link->local_sink && link->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
 		link->dc->hwss.edp_backlight_control(link, false);
+		dc_link_set_abm_disable(link);
+	}
 
 	if (dc_is_dp_signal(pipe_ctx->stream->signal))
 		pipe_ctx->stream_res.stream_enc->funcs->dp_blank(pipe_ctx->stream_res.stream_enc);