drm/amd/display: keep domain24 power on if eDP not exist

This is w/a: we need to keep domain 24 power up in driver side, and let
dmubfw handle it for S0i3. For last display unplugged, if OTG in PG, no
interrupt call back coming.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Chris Park <chris.park@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c

@@ -979,6 +979,8 @@ void dcn35_calc_blocks_to_gate(struct dc *dc, struct dc_state *context,
 	bool hpo_frl_stream_enc_acquired = false;
 	bool hpo_dp_stream_enc_acquired = false;
 	int i = 0, j = 0;
+	int edp_num = 0;
+	struct dc_link *edp_links[MAX_NUM_EDP] = { NULL };
 
 	memset(update_state, 0, sizeof(struct pg_block_update));
 
@@ -1019,10 +1021,24 @@ void dcn35_calc_blocks_to_gate(struct dc *dc, struct dc_state *context,
 
 		if (pipe_ctx->stream_res.opp)
 			update_state->pg_pipe_res_update[PG_OPP][pipe_ctx->stream_res.opp->inst] = false;
+	}
+	/*domain24 controls all the otg, mpc, opp, as long as one otg is still up, avoid enabling OTG PG*/
+	for (i = 0; i < dc->res_pool->timing_generator_count; i++) {
+		struct timing_generator *tg = dc->res_pool->timing_generators[i];
+		if (tg && tg->funcs->is_tg_enabled(tg)) {
+			update_state->pg_pipe_res_update[PG_OPTC][i] = false;
+			break;
+		}
+	}
 
-		if (pipe_ctx->stream_res.tg)
-			update_state->pg_pipe_res_update[PG_OPTC][pipe_ctx->stream_res.tg->inst] = false;
+	dc_get_edp_links(dc, edp_links, &edp_num);
+	if (edp_num == 0 ||
+		((!edp_links[0] || !edp_links[0]->edp_sink_present) &&
+			(!edp_links[1] || !edp_links[1]->edp_sink_present))) {
+		/*eDP not exist on this config, keep Domain24 power on, for S0i3, this will be handled in dmubfw*/
+		update_state->pg_pipe_res_update[PG_OPTC][0] = false;
 	}
+
 }
 
 void dcn35_calc_blocks_to_ungate(struct dc *dc, struct dc_state *context,
@@ -1156,8 +1172,10 @@ void dcn35_block_power_control(struct dc *dc,
 			pg_cntl->funcs->dwb_pg_control(pg_cntl, power_on);
 	}
 
+	/*this will need all the clients to unregister optc interruts let dmubfw handle this*/
 	if (pg_cntl->funcs->plane_otg_pg_control)
 		pg_cntl->funcs->plane_otg_pg_control(pg_cntl, power_on);
+
 }
 
 void dcn35_root_clock_control(struct dc *dc,