drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia.c
Extension
.c
Size
6171 bytes
Lines
172
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: MIT
/*
 * Copyright 2021 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

#include "dc.h"
#include "inc/core_status.h"
#include "dpcd_defs.h"

#include "link_dp_dpia.h"
#include "link_hwss.h"
#include "dm_helpers.h"
#include "dmub/inc/dmub_cmd.h"
#include "link_dpcd.h"
#include "link_dp_training.h"
#include "dc_dmub_srv.h"

#define DC_LOGGER \
	link->ctx->logger

/** @note Can remove once DP tunneling registers in upstream include/drm/drm_dp_helper.h */
/* DPCD DP Tunneling over USB4 */
#define DP_TUNNELING_CAPABILITIES_SUPPORT 0xe000d
#define DP_IN_ADAPTER_INFO                0xe000e
#define DP_USB4_DRIVER_ID                 0xe000f
#define DP_USB4_ROUTER_TOPOLOGY_ID        0xe001b

enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link)
{
	enum dc_status status = DC_OK;
	uint8_t dpcd_dp_tun_data[3] = {0};
	uint8_t dpcd_topology_data[DPCD_USB4_TOPOLOGY_ID_LEN] = {0};
	uint8_t i = 0;

	status = core_link_read_dpcd(
			link,
			DP_TUNNELING_CAPABILITIES_SUPPORT,
			dpcd_dp_tun_data,
			sizeof(dpcd_dp_tun_data));

	if (status != DC_OK)
		goto err;

	link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.raw =
			dpcd_dp_tun_data[DP_TUNNELING_CAPABILITIES_SUPPORT - DP_TUNNELING_CAPABILITIES_SUPPORT];

	if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dp_tunneling == false)
		goto err;

	link->dpcd_caps.usb4_dp_tun_info.dpia_info.raw =
			dpcd_dp_tun_data[DP_IN_ADAPTER_INFO - DP_TUNNELING_CAPABILITIES_SUPPORT];
	link->dpcd_caps.usb4_dp_tun_info.usb4_driver_id =
			dpcd_dp_tun_data[DP_USB4_DRIVER_ID - DP_TUNNELING_CAPABILITIES_SUPPORT] & 0x0F;

	if (link->dpcd_caps.usb4_dp_tun_info.dp_tun_cap.bits.dpia_bw_alloc) {
		status = core_link_read_dpcd(link, USB4_DRIVER_BW_CAPABILITY,
				dpcd_dp_tun_data, 2);

		if (status != DC_OK)
			goto err;

		link->dpcd_caps.usb4_dp_tun_info.driver_bw_cap.raw =
			dpcd_dp_tun_data[USB4_DRIVER_BW_CAPABILITY - USB4_DRIVER_BW_CAPABILITY];
		link->dpcd_caps.usb4_dp_tun_info.dpia_tunnel_info.raw =
			dpcd_dp_tun_data[DP_IN_ADAPTER_TUNNEL_INFO - USB4_DRIVER_BW_CAPABILITY];
	}

	DC_LOG_DEBUG("%s: Link[%d]  DP tunneling support  (RouterId=%d  AdapterId=%d)  "
			"DPIA_BW_Alloc_support=%d "

Annotation

Implementation Notes