linux/drivers/gpu/drm/amd/display/dc/basics/conversion.c

/*
 * Copyright 2012-15 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 "dm_services.h"
#include "basics/conversion.h"

#define DIVIDER …

/* S2D13 value in [-3.00...0.9999] */
#define S2D13_MIN …
#define S2D13_MAX …

uint16_t fixed_point_to_int_frac(
	struct fixed31_32 arg,
	uint8_t integer_bits,
	uint8_t fractional_bits)
{ … }
/*
 * convert_float_matrix - This converts a double into HW register spec defined format S2D13.
 */
void convert_float_matrix(
	uint16_t *matrix,
	struct fixed31_32 *flt,
	uint32_t buffer_size)
{ … }

static struct fixed31_32 int_frac_to_fixed_point(uint16_t arg,
						 uint8_t integer_bits,
						 uint8_t fractional_bits)
{ … }

/**
 * convert_hw_matrix - converts HW values into fixed31_32 matrix.
 * @matrix: fixed point 31.32 matrix
 * @reg: array of register values
 * @buffer_size: size of the array of register values
 *
 * Converts HW register spec defined format S2D13 into a fixed-point 31.32
 * matrix.
 */
void convert_hw_matrix(struct fixed31_32 *matrix,
		       uint16_t *reg,
		       uint32_t buffer_size)
{ … }

static uint32_t find_gcd(uint32_t a, uint32_t b)
{ … }

void reduce_fraction(uint32_t num, uint32_t den,
		uint32_t *out_num, uint32_t *out_den)
{ … }