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