drm/amd/display: add stream ID and otg instance in dc_stream_state

[why]
stream ID allows DMs to avoid memory address comparisons to compare
stream equality.
otg_instance allows DC to more rigorously define when otg_instance
can change.  specifically, it is now defined to be only mutable when dc_stream_state
changes.  This is better than a "get status" function which prevents efficient
caching of otherwise very stable information.

[how]
stream ID follows similar pattern to sink ID, which is already implemented

otg_instance is an output which occurs on all dc_stream modification functions
Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -669,6 +669,7 @@ static bool construct(struct dc *dc,
 	dc_ctx->dc = dc;
 	dc_ctx->asic_id = init_params->asic_id;
 	dc_ctx->dc_sink_id_count = 0;
+	dc_ctx->dc_stream_id_count = 0;
 	dc->ctx = dc_ctx;
 
 	dc->current_state = dc_create_state();
@@ -1045,6 +1046,7 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
 	/* Program all planes within new context*/
 	for (i = 0; i < context->stream_count; i++) {
 		const struct dc_link *link = context->streams[i]->link;
+		struct dc_stream_status *status;
 
 		if (!context->streams[i]->mode_changed)
 			continue;
@@ -1069,6 +1071,9 @@ static enum dc_status dc_commit_state_no_check(struct dc *dc, struct dc_state *c
 			}
 		}
 
+		status = dc_stream_get_status(context->streams[i]);
+		context->streams[i]->out.otg_offset = status->primary_otg_inst;
+
 		CONN_MSG_MODE(link, "{%dx%d, %dx%d@%dKhz}",
 				context->streams[i]->timing.h_addressable,
 				context->streams[i]->timing.v_addressable,

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

@@ -107,6 +107,9 @@ static void construct(struct dc_stream_state *stream,
 	stream->out_transfer_func = dc_create_transfer_func();
 	stream->out_transfer_func->type = TF_TYPE_BYPASS;
 	stream->out_transfer_func->ctx = stream->ctx;
+
+	stream->stream_id = stream->ctx->dc_stream_id_count;
+	stream->ctx->dc_stream_id_count++;
 }
 
 static void destruct(struct dc_stream_state *stream)

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

@@ -127,6 +127,18 @@ struct dc_stream_state {
 	/* Computed state bits */
 	bool mode_changed : 1;
 
+	/* Output from DC when stream state is committed or altered
+	 * DC may only access these values during:
+	 * dc_commit_state, dc_commit_state_no_check, dc_commit_streams
+	 * values may not change outside of those calls
+	 */
+	struct {
+		// For interrupt management, some hardware instance
+		// offsets need to be exposed to DM
+		uint8_t otg_offset;
+	} out;
+
+	uint32_t stream_id;
 };
 
 struct dc_stream_update {

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

@@ -99,6 +99,7 @@ struct dc_context {
 	struct gpio_service *gpio_service;
 	struct i2caux *i2caux;
 	uint32_t dc_sink_id_count;
+	uint32_t dc_stream_id_count;
 	uint64_t fbc_gpu_addr;
 };