drm/amd/display: Added dc_edp_id_count to dc_context

[Why]
We need to keep track of the number of eDP links to
properly enumerate edp panel control instance.

[How]
Added dc_edp_id_count to dc_context to keep track of
number of eDP links.

Signed-off-by: Jake Wang <[e-mail]>
Reviewed-by: Nicholas Kazlauskas <[e-mail]>
Acked-by: Qingqing Zhuo <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	struct dc_bios *bios = init_params->dc->ctx->dc_bios;
 	const struct dc_vbios_funcs *bp_funcs = bios->funcs;
 	struct bp_disp_connector_caps_info disp_connect_caps_info = { 0 };
-	struct dc_link *edp_links[MAX_NUM_EDP];
-	int edp_num;
 
 	DC_LOGGER_INIT(dc_ctx->logger);
 
···
 		(link->link_id.id == CONNECTOR_ID_EDP ||
 			link->link_id.id == CONNECTOR_ID_LVDS)) {
 		panel_cntl_init_data.ctx = dc_ctx;
-		get_edp_links(panel_cntl_init_data.ctx->dc, edp_links, &edp_num);
-		if ((edp_num > 1) && (link->link_index > edp_links[0]->link_index))
-			panel_cntl_init_data.inst = 1;
-		else
-			panel_cntl_init_data.inst = 0;
+		panel_cntl_init_data.inst =
+			panel_cntl_init_data.ctx->dc_edp_id_count;
 		link->panel_cntl =
 			link->dc->res_pool->funcs->panel_cntl_create(
 								&panel_cntl_init_data);
+		panel_cntl_init_data.ctx->dc_edp_id_count++;
 
 		if (link->panel_cntl == NULL) {
 			DC_ERROR("Failed to create link panel_cntl!\n");

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

···
 	struct gpio_service *gpio_service;
 	uint32_t dc_sink_id_count;
 	uint32_t dc_stream_id_count;
+	uint32_t dc_edp_id_count;
 	uint64_t fbc_gpu_addr;
 	struct dc_dmub_srv *dmub_srv;