// SPDX-License-Identifier: GPL-2.0-only
/*
* Color space converter library
*
* Copyright (c) 2013 Texas Instruments Inc.
*
* David Griego, <[email protected]>
* Dale Farnsworth, <[email protected]>
* Archit Taneja, <[email protected]>
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include "csc.h"
/*
* 12 coefficients in the order:
* a0, b0, c0, a1, b1, c1, a2, b2, c2, d0, d1, d2
*/
struct quantization {
u16 coeff[12];
};
struct colorspace {
struct quantization limited;
struct quantization full;
};
struct encoding_direction {
struct colorspace r601;
struct colorspace r709;
};
struct csc_coeffs {
struct encoding_direction y2r;
struct encoding_direction r2y;
};
/* default colorspace coefficients */
static struct csc_coeffs csc_coeffs = {
.y2r = {
.r601 = {
.limited = {
{ /* SDTV */
0x0400, 0x0000, 0x057D, 0x0400, 0x1EA7, 0x1D35,
0x0400, 0x06EF, 0x1FFE, 0x0D40, 0x0210, 0x0C88,
}
},
.full = {
{ /* SDTV */
0x04A8, 0x1FFE, 0x0662, 0x04A8, 0x1E6F, 0x1CBF,
0x04A8, 0x0812, 0x1FFF, 0x0C84, 0x0220, 0x0BAC,
}
},
},
.r709 = {
.limited = {
{ /* HDTV */
0x0400, 0x0000, 0x0629, 0x0400, 0x1F45, 0x1E2B,
0x0400, 0x0742, 0x0000, 0x0CEC, 0x0148, 0x0C60,
}
},
.full = {
{ /* HDTV */
0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
}
},
},
},
.r2y = {
.r601 = {
.limited = {
{ /* SDTV */
0x0132, 0x0259, 0x0075, 0x1F50, 0x1EA5, 0x020B,
0x020B, 0x1E4A, 0x1FAB, 0x0000, 0x0200, 0x0200,
}
},
.full = {
{ /* SDTV */
0x0107, 0x0204, 0x0064, 0x1F68, 0x1ED6, 0x01C2,
0x01C2, 0x1E87, 0x1FB7, 0x0040, 0x0200, 0x0200,
}
},
},
.r709 = {
.limited = {
{ /* HDTV */
0x00DA, 0x02DC, 0x004A, 0x1F88, 0x1E6C, 0x020C,
0x020C, 0x1E24, 0x1FD0, 0x0000, 0x0200, 0x0200,
}
},
.full = {
{ /* HDTV */
0x00bb, 0x0275, 0x003f, 0x1f99, 0x1ea5, 0x01c2,
0x01c2, 0x1e67, 0x1fd7, 0x0040, 0x0200, 0x0200,
}
},
},
},
};
void csc_dump_regs(struct csc_data *csc)
{
struct device *dev = &csc->pdev->dev;
#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
ioread32(csc->base + CSC_##r))
dev_dbg(dev, "CSC Registers @ %pa:\n", &csc->res->start);
DUMPREG(CSC00);
DUMPREG(CSC01);
DUMPREG(CSC02);
DUMPREG(CSC03);
DUMPREG(CSC04);
DUMPREG(CSC05);
#undef DUMPREG
}
EXPORT_SYMBOL(csc_dump_regs);
void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5)
{
*csc_reg5 |= CSC_BYPASS;
}
EXPORT_SYMBOL(csc_set_coeff_bypass);
/*
* set the color space converter coefficient shadow register values
*/
void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0,
struct v4l2_format *src_fmt, struct v4l2_format *dst_fmt)
{
u32 *csc_reg5 = csc_reg0 + 5;
u32 *shadow_csc = csc_reg0;
u16 *coeff, *end_coeff;
const struct v4l2_pix_format *pix;
const struct v4l2_pix_format_mplane *mp;
const struct v4l2_format_info *src_finfo, *dst_finfo;
enum v4l2_ycbcr_encoding src_ycbcr_enc, dst_ycbcr_enc;
enum v4l2_quantization src_quantization, dst_quantization;
u32 src_pixelformat, dst_pixelformat;
if (V4L2_TYPE_IS_MULTIPLANAR(src_fmt->type)) {
mp = &src_fmt->fmt.pix_mp;
src_pixelformat = mp->pixelformat;
src_ycbcr_enc = mp->ycbcr_enc;
src_quantization = mp->quantization;
} else {
pix = &src_fmt->fmt.pix;
src_pixelformat = pix->pixelformat;
src_ycbcr_enc = pix->ycbcr_enc;
src_quantization = pix->quantization;
}
if (V4L2_TYPE_IS_MULTIPLANAR(dst_fmt->type)) {
mp = &dst_fmt->fmt.pix_mp;
dst_pixelformat = mp->pixelformat;
dst_ycbcr_enc = mp->ycbcr_enc;
dst_quantization = mp->quantization;
} else {
pix = &dst_fmt->fmt.pix;
dst_pixelformat = pix->pixelformat;
dst_ycbcr_enc = pix->ycbcr_enc;
dst_quantization = pix->quantization;
}
src_finfo = v4l2_format_info(src_pixelformat);
dst_finfo = v4l2_format_info(dst_pixelformat);
if (v4l2_is_format_yuv(src_finfo) &&
v4l2_is_format_rgb(dst_finfo)) {
/* Y2R */
/*
* These are not the standard default values but are
* set this way for historical compatibility
*/
if (src_ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
src_ycbcr_enc = V4L2_YCBCR_ENC_601;
if (src_quantization == V4L2_QUANTIZATION_DEFAULT)
src_quantization = V4L2_QUANTIZATION_FULL_RANGE;
if (src_ycbcr_enc == V4L2_YCBCR_ENC_601) {
if (src_quantization == V4L2_QUANTIZATION_FULL_RANGE)
coeff = csc_coeffs.y2r.r601.full.coeff;
else
coeff = csc_coeffs.y2r.r601.limited.coeff;
} else if (src_ycbcr_enc == V4L2_YCBCR_ENC_709) {
if (src_quantization == V4L2_QUANTIZATION_FULL_RANGE)
coeff = csc_coeffs.y2r.r709.full.coeff;
else
coeff = csc_coeffs.y2r.r709.limited.coeff;
} else {
/* Should never reach this, but it keeps gcc happy */
coeff = csc_coeffs.y2r.r601.full.coeff;
}
} else if (v4l2_is_format_rgb(src_finfo) &&
v4l2_is_format_yuv(dst_finfo)) {
/* R2Y */
/*
* These are not the standard default values but are
* set this way for historical compatibility
*/
if (dst_ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
dst_ycbcr_enc = V4L2_YCBCR_ENC_601;
if (dst_quantization == V4L2_QUANTIZATION_DEFAULT)
dst_quantization = V4L2_QUANTIZATION_FULL_RANGE;
if (dst_ycbcr_enc == V4L2_YCBCR_ENC_601) {
if (dst_quantization == V4L2_QUANTIZATION_FULL_RANGE)
coeff = csc_coeffs.r2y.r601.full.coeff;
else
coeff = csc_coeffs.r2y.r601.limited.coeff;
} else if (dst_ycbcr_enc == V4L2_YCBCR_ENC_709) {
if (dst_quantization == V4L2_QUANTIZATION_FULL_RANGE)
coeff = csc_coeffs.r2y.r709.full.coeff;
else
coeff = csc_coeffs.r2y.r709.limited.coeff;
} else {
/* Should never reach this, but it keeps gcc happy */
coeff = csc_coeffs.r2y.r601.full.coeff;
}
} else {
*csc_reg5 |= CSC_BYPASS;
return;
}
end_coeff = coeff + 12;
for (; coeff < end_coeff; coeff += 2)
*shadow_csc++ = (*(coeff + 1) << 16) | *coeff;
}
EXPORT_SYMBOL(csc_set_coeff);
struct csc_data *csc_create(struct platform_device *pdev, const char *res_name)
{
struct csc_data *csc;
dev_dbg(&pdev->dev, "csc_create\n");
csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL);
if (!csc) {
dev_err(&pdev->dev, "couldn't alloc csc_data\n");
return ERR_PTR(-ENOMEM);
}
csc->pdev = pdev;
csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
res_name);
if (csc->res == NULL) {
dev_err(&pdev->dev, "missing '%s' platform resources data\n",
res_name);
return ERR_PTR(-ENODEV);
}
csc->base = devm_ioremap_resource(&pdev->dev, csc->res);
if (IS_ERR(csc->base))
return ERR_CAST(csc->base);
return csc;
}
EXPORT_SYMBOL(csc_create);
MODULE_DESCRIPTION("TI VIP/VPE Color Space Converter");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_LICENSE("GPL v2");
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