linux_kernel/drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c

/*
 * Copyright 2018 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 "dce_i2c.h"
#include "reg_helper.h"

bool dce_i2c_submit_command(
	struct resource_pool *pool,
	struct ddc *ddc,
	struct i2c_command *cmd)
{
	struct dce_i2c_hw *dce_i2c_hw;
	struct dce_i2c_sw *dce_i2c_sw;

	if (!ddc) {
		BREAK_TO_DEBUGGER();
		return false;
	}

	if (!cmd) {
		BREAK_TO_DEBUGGER();
		return false;
	}

	/* The software engine is only available on dce8 */
	dce_i2c_sw = dce_i2c_acquire_i2c_sw_engine(pool, ddc);

	if (!dce_i2c_sw) {
		dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);

		if (!dce_i2c_hw)
			return false;

		return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);
	}

	return dce_i2c_submit_command_sw(pool, ddc, cmd, dce_i2c_sw);

}