drm/amd/display: Expose generic SDP message access interface

[Why]
We need to add DP SDP message test debugfs to make sdp message test
more convenient and efficient.

[How]
Add a DM accessible SDP interface for custom data.
Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2394,6 +2394,21 @@ static void set_spd_info_packet(
 	*info_packet = stream->vrr_infopacket;
 }
 
+static void set_dp_sdp_info_packet(
+		struct dc_info_packet *info_packet,
+		struct dc_stream_state *stream)
+{
+	/* SPD info packet for custom sdp message */
+
+	/* Return if false. If true,
+	 * set the corresponding bit in the info packet
+	 */
+	if (!stream->dpsdp_infopacket.valid)
+		return;
+
+	*info_packet = stream->dpsdp_infopacket;
+}
+
 static void set_hdr_static_info_packet(
 		struct dc_info_packet *info_packet,
 		struct dc_stream_state *stream)
@@ -2490,6 +2505,7 @@ void resource_build_info_frame(struct pipe_ctx *pipe_ctx)
 	info->spd.valid = false;
 	info->hdrsmd.valid = false;
 	info->vsc.valid = false;
+	info->dpsdp.valid = false;
 
 	signal = pipe_ctx->stream->signal;
 
@@ -2509,6 +2525,8 @@ void resource_build_info_frame(struct pipe_ctx *pipe_ctx)
 		set_spd_info_packet(&info->spd, pipe_ctx->stream);
 
 		set_hdr_static_info_packet(&info->hdrsmd, pipe_ctx->stream);
+
+		set_dp_sdp_info_packet(&info->dpsdp, pipe_ctx->stream);
 	}
 
 	patch_gamut_packet_checksum(&info->gamut);

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

@@ -345,6 +345,68 @@ uint32_t dc_stream_get_vblank_counter(const struct dc_stream_state *stream)
 	return 0;
 }
 
+static void build_dp_sdp_info_frame(struct pipe_ctx *pipe_ctx,
+		const uint8_t  *custom_sdp_message,
+		unsigned int sdp_message_size)
+{
+	uint8_t i;
+	struct encoder_info_frame *info = &pipe_ctx->stream_res.encoder_info_frame;
+
+	/* set valid info */
+	info->dpsdp.valid = true;
+
+	/* set sdp message header */
+	info->dpsdp.hb0 = custom_sdp_message[0]; /* package id */
+	info->dpsdp.hb1 = custom_sdp_message[1]; /* package type */
+	info->dpsdp.hb2 = custom_sdp_message[2]; /* package specific byte 0 any data */
+	info->dpsdp.hb3 = custom_sdp_message[3]; /* package specific byte 0 any data */
+
+	/* set sdp message data */
+	for (i = 0; i < 32; i++)
+		info->dpsdp.sb[i] = (custom_sdp_message[i+4]);
+
+}
+
+static void invalid_dp_sdp_info_frame(struct pipe_ctx *pipe_ctx)
+{
+	struct encoder_info_frame *info = &pipe_ctx->stream_res.encoder_info_frame;
+
+	/* in-valid info */
+	info->dpsdp.valid = false;
+}
+
+bool dc_stream_send_dp_sdp(const struct dc_stream_state *stream,
+		const uint8_t *custom_sdp_message,
+		unsigned int sdp_message_size)
+{
+	int i;
+	struct dc  *core_dc;
+	struct resource_context *res_ctx;
+
+	if (stream == NULL) {
+		dm_error("DC: dc_stream is NULL!\n");
+		return false;
+	}
+
+	core_dc = stream->ctx->dc;
+	res_ctx = &core_dc->current_state->res_ctx;
+
+	for (i = 0; i < MAX_PIPES; i++) {
+		struct pipe_ctx *pipe_ctx = &res_ctx->pipe_ctx[i];
+
+		if (pipe_ctx->stream != stream)
+			continue;
+
+		build_dp_sdp_info_frame(pipe_ctx, custom_sdp_message, sdp_message_size);
+
+		core_dc->hwss.update_info_frame(pipe_ctx);
+
+		invalid_dp_sdp_info_frame(pipe_ctx);
+	}
+
+	return true;
+}
+
 bool dc_stream_get_scanoutpos(const struct dc_stream_state *stream,
 				  uint32_t *v_blank_start,
 				  uint32_t *v_blank_end,

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

@@ -80,6 +80,7 @@ struct dc_stream_state {
 	struct dc_info_packet vrr_infopacket;
 	struct dc_info_packet vsc_infopacket;
 	struct dc_info_packet vsp_infopacket;
+	struct dc_info_packet dpsdp_infopacket;
 
 	struct rect src; /* composition area */
 	struct rect dst; /* stream addressable area */
@@ -221,6 +222,13 @@ struct dc_stream_state *dc_get_stream_at_index(struct dc *dc, uint8_t i);
  */
 uint32_t dc_stream_get_vblank_counter(const struct dc_stream_state *stream);
 
+/*
+ * Send dp sdp message.
+ */
+bool dc_stream_send_dp_sdp(const struct dc_stream_state *stream,
+		const uint8_t *custom_sdp_message,
+		unsigned int sdp_message_size);
+
 /* TODO: Return parsed values rather than direct register read
  * This has a dependency on the caller (amdgpu_display_get_crtc_scanoutpos)
  * being refactored properly to be dce-specific

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_stream_encoder.c

@@ -725,13 +725,19 @@ void enc1_stream_encoder_update_dp_info_packets(
 				3,  /* packetIndex */
 				&info_frame->hdrsmd);
 
+	if (info_frame->dpsdp.valid)
+		enc1_update_generic_info_packet(
+				enc1,
+				4,/* packetIndex */
+				&info_frame->dpsdp);
+
 	/* enable/disable transmission of packet(s).
 	 * If enabled, packet transmission begins on the next frame
 	 */
 	REG_UPDATE(DP_SEC_CNTL, DP_SEC_GSP0_ENABLE, info_frame->vsc.valid);
 	REG_UPDATE(DP_SEC_CNTL, DP_SEC_GSP2_ENABLE, info_frame->spd.valid);
 	REG_UPDATE(DP_SEC_CNTL, DP_SEC_GSP3_ENABLE, info_frame->hdrsmd.valid);
-
+	REG_UPDATE(DP_SEC_CNTL, DP_SEC_GSP4_ENABLE, info_frame->dpsdp.valid);
 
 	/* This bit is the master enable bit.
 	 * When enabling secondary stream engine,

drivers/gpu/drm/amd/display/dc/inc/hw/stream_encoder.h

@@ -63,6 +63,8 @@ struct encoder_info_frame {
 	struct dc_info_packet vsc;
 	/* HDR Static MetaData */
 	struct dc_info_packet hdrsmd;
+	/* custom sdp message */
+	struct dc_info_packet dpsdp;
 };
 
 struct encoder_unblank_param {