linux/drivers/gpu/drm/amd/display/dc/link/link_validation.c

/*
 * Copyright 2023 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
 *
 */

/* FILE POLICY AND INTENDED USAGE:
 * This file owns timing validation against various link limitations. (ex.
 * link bandwidth, receiver capability or our hardware capability) It also
 * provides helper functions exposing bandwidth formulas used in validation.
 */
#include "link_validation.h"
#include "protocols/link_dp_capability.h"
#include "protocols/link_dp_dpia_bw.h"
#include "resource.h"

#define DC_LOGGER_INIT(logger) …

static uint32_t get_tmds_output_pixel_clock_100hz(const struct dc_crtc_timing *timing)
{ … }

static bool dp_active_dongle_validate_timing(
		const struct dc_crtc_timing *timing,
		const struct dpcd_caps *dpcd_caps)
{ … }

uint32_t dp_link_bandwidth_kbps(
	const struct dc_link *link,
	const struct dc_link_settings *link_settings)
{ … }

static bool dp_validate_mode_timing(
	struct dc_link *link,
	const struct dc_crtc_timing *timing)
{ … }

enum dc_status link_validate_mode_timing(
		const struct dc_stream_state *stream,
		struct dc_link *link,
		const struct dc_crtc_timing *timing)
{ … }

/*
 * This function calculates the bandwidth required for the stream timing
 * and aggregates the stream bandwidth for the respective dpia link
 *
 * @stream: pointer to the dc_stream_state struct instance
 * @num_streams: number of streams to be validated
 *
 * return: true if validation is succeeded
 */
bool link_validate_dpia_bandwidth(const struct dc_stream_state *stream, const unsigned int num_streams)
{ … }