linux/drivers/staging/media/atomisp/pci/isp/kernels/xnr/xnr_3.0/ia_css_xnr3.host.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2015, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/log2.h>

#include "type_support.h"
#include "math_support.h"
#include "sh_css_defs.h"
#include "ia_css_types.h"
#include "assert_support.h"
#include "ia_css_xnr3.host.h"

/* Maximum value for alpha on ISP interface */
#define XNR_MAX_ALPHA …

/* Minimum value for sigma on host interface. Lower values translate to
 * max_alpha.
 */
#define XNR_MIN_SIGMA …

/*
 * division look-up table
 * Refers to XNR3.0.5
 */
#define XNR3_LOOK_UP_TABLE_POINTS …

static const s16 x[XNR3_LOOK_UP_TABLE_POINTS] = …;

static const s16 a[XNR3_LOOK_UP_TABLE_POINTS] = …;

static const s16 b[XNR3_LOOK_UP_TABLE_POINTS] = …;

static const s16 c[XNR3_LOOK_UP_TABLE_POINTS] = …;

/*
 * Default kernel parameters. In general, default is bypass mode or as close
 * to the ineffective values as possible. Due to the chroma down+upsampling,
 * perfect bypass mode is not possible for xnr3 filter itself. Instead, the
 * 'blending' parameter is used to create a bypass.
 */
const struct ia_css_xnr3_config default_xnr3_config = …;

/*
 * Compute an alpha value for the ISP kernel from sigma value on the host
 * parameter interface as: alpha_scale * 1/(sigma/sigma_scale)
 */
static int32_t
compute_alpha(int sigma)
{ … }

/*
 * Compute the scaled coring value for the ISP kernel from the value on the
 * host parameter interface.
 */
static int32_t
compute_coring(int coring)
{ … }

/*
 * Compute the scaled blending strength for the ISP kernel from the value on
 * the host parameter interface.
 */
static int32_t
compute_blending(int strength)
{ … }

void
ia_css_xnr3_encode(
    struct sh_css_isp_xnr3_params *to,
    const struct ia_css_xnr3_config *from,
    unsigned int size)
{ … }

/* ISP2401 */
/* (void) = ia_css_xnr3_vmem_encode(*to, *from)
 * -----------------------------------------------
 * VMEM Encode Function to translate UV parameters from userspace into ISP space
*/
void
ia_css_xnr3_vmem_encode(
    struct sh_css_isp_xnr3_vmem_params *to,
    const struct ia_css_xnr3_config *from,
    unsigned int size)
{ … }

/* Dummy Function added as the tool expects it*/
void
ia_css_xnr3_debug_dtrace(
    const struct ia_css_xnr3_config *config,
    unsigned int level)
{ … }