drm/amd/display: create sink_id in dc_sink structure to idenitify all sinks

Signed-off-by: Alvin lee <alvin.lee3@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@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.c

@@ -481,6 +481,7 @@ static bool construct(struct dc *dc,
 	dc_ctx->driver_context = init_params->driver;
 	dc_ctx->dc = dc;
 	dc_ctx->asic_id = init_params->asic_id;
+	dc_ctx->dc_sink_id_count = 0;
 	dc->ctx = dc_ctx;
 
 	dc->current_state = dc_create_state();

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

@@ -53,6 +53,10 @@ static bool construct(struct dc_sink *sink, const struct dc_sink_init_data *init
 	sink->dongle_max_pix_clk = init_params->dongle_max_pix_clk;
 	sink->converter_disable_audio = init_params->converter_disable_audio;
 	sink->dc_container_id = NULL;
+	sink->sink_id = init_params->link->ctx->dc_sink_id_count;
+	// increment dc_sink_id_count because we don't want two sinks with same ID
+	// unless they are actually the same
+	init_params->link->ctx->dc_sink_id_count++;
 
 	return true;
 }

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

@@ -666,9 +666,13 @@ struct dc_sink {
 	struct dc_link *link;
 	struct dc_context *ctx;
 
+	uint32_t sink_id;
+
 	/* private to dc_sink.c */
+	// refcount must be the last member in dc_sink, since we want the
+	// sink structure to be logically cloneable up to (but not including)
+	// refcount
 	struct kref refcount;
-
 };
 
 void dc_sink_retain(struct dc_sink *sink);

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

@@ -92,6 +92,7 @@ struct dc_context {
 	bool created_bios;
 	struct gpio_service *gpio_service;
 	struct i2caux *i2caux;
+	uint32_t dc_sink_id_count;
 	uint64_t fbc_gpu_addr;
 };