drm/amd/display: Pass override OUI in to dc_init_data

[WHY]
Vendor dongle requires propietary OUI and handshake sequence.

[HOW]
Add a new structure to dc_init_data, to allow creator to pass
an override vendor_oui. This value will be written to DP_SOURCE_OUI
instead of AMD signature, when dpcd_set_source_specific_data is
called.
Signed-off-by: Calvin Hou <Calvin.Hou@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@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

@@ -701,7 +701,7 @@ static bool dc_construct(struct dc *dc,
 		dc_ctx->created_bios = true;
 	}
 
-
+	dc->vendor_signature = init_params->vendor_signature;
 
 	/* Create GPIO service */
 	dc_ctx->gpio_service = dal_gpio_service_create(

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

@@ -4179,25 +4179,32 @@ void dp_set_fec_enable(struct dc_link *link, bool enable)
 
 void dpcd_set_source_specific_data(struct dc_link *link)
 {
-	struct dpcd_amd_signature amd_signature;
 	const uint32_t post_oui_delay = 30; // 30ms
 
-	amd_signature.AMD_IEEE_TxSignature_byte1 = 0x0;
-	amd_signature.AMD_IEEE_TxSignature_byte2 = 0x0;
-	amd_signature.AMD_IEEE_TxSignature_byte3 = 0x1A;
-	amd_signature.device_id_byte1 =
-			(uint8_t)(link->ctx->asic_id.chip_id);
-	amd_signature.device_id_byte2 =
-			(uint8_t)(link->ctx->asic_id.chip_id >> 8);
-	memset(&amd_signature.zero, 0, 4);
-	amd_signature.dce_version =
-			(uint8_t)(link->ctx->dce_version);
-	amd_signature.dal_version_byte1 = 0x0; // needed? where to get?
-	amd_signature.dal_version_byte2 = 0x0; // needed? where to get?
-
-	core_link_write_dpcd(link, DP_SOURCE_OUI,
-			(uint8_t *)(&amd_signature),
-			sizeof(amd_signature));
+	if (!link->dc->vendor_signature.is_valid) {
+		struct dpcd_amd_signature amd_signature;
+		amd_signature.AMD_IEEE_TxSignature_byte1 = 0x0;
+		amd_signature.AMD_IEEE_TxSignature_byte2 = 0x0;
+		amd_signature.AMD_IEEE_TxSignature_byte3 = 0x1A;
+		amd_signature.device_id_byte1 =
+				(uint8_t)(link->ctx->asic_id.chip_id);
+		amd_signature.device_id_byte2 =
+				(uint8_t)(link->ctx->asic_id.chip_id >> 8);
+		memset(&amd_signature.zero, 0, 4);
+		amd_signature.dce_version =
+				(uint8_t)(link->ctx->dce_version);
+		amd_signature.dal_version_byte1 = 0x0; // needed? where to get?
+		amd_signature.dal_version_byte2 = 0x0; // needed? where to get?
+
+		core_link_write_dpcd(link, DP_SOURCE_OUI,
+				(uint8_t *)(&amd_signature),
+				sizeof(amd_signature));
+
+	} else {
+		core_link_write_dpcd(link, DP_SOURCE_OUI,
+				link->dc->vendor_signature.data.raw,
+				sizeof(link->dc->vendor_signature.data.raw));
+	}
 
 	// Sink may need to configure internals based on vendor, so allow some
 	// time before proceeding with possibly vendor specific transactions

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

@@ -527,6 +527,7 @@ struct dc {
 	struct compressor *fbc_compressor;
 
 	struct dc_debug_data debug_data;
+	struct dpcd_vendor_signature vendor_signature;
 
 	const char *build_id;
 	struct vm_helper *vm_helper;
@@ -573,6 +574,7 @@ struct dc_init_data {
 	 * available in FW
 	 */
 	const struct gpu_info_soc_bounding_box_v1_0 *soc_bounding_box;
+	struct dpcd_vendor_signature vendor_signature;
 };
 
 struct dc_callback_init {

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

@@ -432,6 +432,20 @@ struct dp_sink_hw_fw_revision {
 	uint8_t ieee_fw_rev[2];
 };
 
+struct dpcd_vendor_signature {
+	bool is_valid;
+
+	union dpcd_ieee_vendor_signature {
+		struct {
+			uint8_t ieee_oui[3];/*24-bit IEEE OUI*/
+			uint8_t ieee_device_id[6];/*usually 6-byte ASCII name*/
+			uint8_t ieee_hw_rev;
+			uint8_t ieee_fw_rev[2];
+		};
+		uint8_t raw[12];
+	} data;
+};
+
 struct dpcd_amd_signature {
 	uint8_t AMD_IEEE_TxSignature_byte1;
 	uint8_t AMD_IEEE_TxSignature_byte2;