drm/amd/display: Check multiple internal displays for power optimization.

[Why & How]
only apply multiple display power optimization in case there are more
than one internal display.
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -149,6 +149,20 @@ static void destroy_links(struct dc *dc)
 	}
 }
 
+static uint32_t get_num_of_internal_disp(struct dc_link **links, uint32_t num_links)
+{
+	int i;
+	uint32_t count = 0;
+
+	for (i = 0; i < num_links; i++) {
+		if (links[i]->connector_signal == SIGNAL_TYPE_EDP ||
+				links[i]->is_internal_display)
+			count++;
+	}
+
+	return count;
+}
+
 static bool create_links(
 		struct dc *dc,
 		uint32_t num_virtual_links)
@@ -250,6 +264,8 @@ static bool create_links(
 		virtual_link_encoder_construct(link->link_enc, &enc_init);
 	}
 
+	dc->caps.num_of_internal_disp = get_num_of_internal_disp(dc->links, dc->link_count);
+
 	return true;
 
 failed_alloc:

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

@@ -169,6 +169,7 @@ struct dc_caps {
 	bool psp_setup_panel_mode;
 	bool extended_aux_timeout_support;
 	bool dmcub_support;
+	uint32_t num_of_internal_disp;
 	enum dp_protocol_version max_dp_protocol_version;
 	struct dc_plane_cap planes[MAX_PLANES];
 	struct dc_color_caps color;