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Commit e3e4820d authored by Steve Longerbeam's avatar Steve Longerbeam Committed by Philipp Zabel
Browse files

gpu: ipu-v3: ipu-ic-csc: Add support for limited range encoding 



Add support for encodings to or from limited range quantization.

Signed-off-by: default avatarSteve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent f208b26e

drivers/gpu/ipu-v3/ipu-ic-csc.c

+166 −14
Original line number Diff line number Diff line
@@ -10,6 +10,10 @@ 
#include <linux/sizes.h>

#include "ipu-prv.h"



#define QUANT_MAP(q)					\

	((q) == V4L2_QUANTIZATION_FULL_RANGE ||		\

	 (q) == V4L2_QUANTIZATION_DEFAULT ? 0 : 1)



/* identity matrix */

static const struct ipu_ic_csc_params identity = {

	.coeff = {
@@ -21,12 +25,87 @@ static const struct ipu_ic_csc_params identity = { 
	.scale = 2,

};



/*

 * RGB full-range to RGB limited-range

 *

 * R_lim = 0.8588 * R_full + 16

 * G_lim = 0.8588 * G_full + 16

 * B_lim = 0.8588 * B_full + 16

 */

static const struct ipu_ic_csc_params rgbf2rgbl = {

	.coeff = {

		{  220,    0,    0, },

		{    0,  220,    0, },

		{    0,    0,  220, },

	},

	.offset = { 64, 64, 64, },

	.scale = 1,

};



/*

 * RGB limited-range to RGB full-range

 *

 * R_full = 1.1644 * (R_lim - 16)

 * G_full = 1.1644 * (G_lim - 16)

 * B_full = 1.1644 * (B_lim - 16)

 */

static const struct ipu_ic_csc_params rgbl2rgbf = {

	.coeff = {

		{  149,    0,    0, },

		{    0,  149,    0, },

		{    0,    0,  149, },

	},

	.offset = { -37, -37, -37, },

	.scale = 2,

};



/*

 * YUV full-range to YUV limited-range

 *

 * Y_lim  = 0.8588 * Y_full + 16

 * Cb_lim = 0.8784 * (Cb_full - 128) + 128

 * Cr_lim = 0.8784 * (Cr_full - 128) + 128

 */

static const struct ipu_ic_csc_params yuvf2yuvl = {

	.coeff = {

		{  220,    0,    0, },

		{    0,  225,    0, },

		{    0,    0,  225, },

	},

	.offset = { 64, 62, 62, },

	.scale = 1,

	.sat = true,

};



/*

 * YUV limited-range to YUV full-range

 *

 * Y_full  = 1.1644 * (Y_lim - 16)

 * Cb_full = 1.1384 * (Cb_lim - 128) + 128

 * Cr_full = 1.1384 * (Cr_lim - 128) + 128

 */

static const struct ipu_ic_csc_params yuvl2yuvf = {

	.coeff = {

		{  149,    0,    0, },

		{    0,  146,    0, },

		{    0,    0,  146, },

	},

	.offset = { -37, -35, -35, },

	.scale = 2,

};



static const struct ipu_ic_csc_params *rgb2rgb[] = {

	&identity,

	&rgbf2rgbl,

	&rgbl2rgbf,

	&identity,

};



static const struct ipu_ic_csc_params *yuv2yuv[] = {

	&identity,

	&yuvf2yuvl,

	&yuvl2yuvf,

	&identity,

};



/*
@@ -46,6 +125,41 @@ static const struct ipu_ic_csc_params rgbf2yuvf_601 = { 
	.scale = 1,

};



/* BT.601 RGB full-range to YUV limited-range */

static const struct ipu_ic_csc_params rgbf2yuvl_601 = {

	.coeff = {

		{   66,  129,   25, },

		{  -38,  -74,  112, },

		{  112,  -94,  -18, },

	},

	.offset = { 64, 512, 512, },

	.scale = 1,

	.sat = true,

};



/* BT.601 RGB limited-range to YUV full-range */

static const struct ipu_ic_csc_params rgbl2yuvf_601 = {

	.coeff = {

		{   89,  175,   34, },

		{  -50,  -99,  149, },

		{  149, -125,  -24, },

	},

	.offset = { -75, 512, 512, },

	.scale = 1,

};



/* BT.601 RGB limited-range to YUV limited-range */

static const struct ipu_ic_csc_params rgbl2yuvl_601 = {

	.coeff = {

		{   77,  150,   29, },

		{  -44,  -87,  131, },

		{  131, -110,  -21, },

	},

	.offset = { 0, 512, 512, },

	.scale = 1,

	.sat = true,

};



/*

 * BT.601 YUV full-range to RGB full-range

 *
@@ -69,39 +183,77 @@ static const struct ipu_ic_csc_params yuvf2rgbf_601 = { 
	.scale = 2,

};



/* BT.601 YUV full-range to RGB limited-range */

static const struct ipu_ic_csc_params yuvf2rgbl_601 = {

	.coeff = {

		{  110,    0,  154, },

		{  110,  -38,  -78, },

		{  110,  195,    0, },

	},

	.offset = { -276, 265, -358, },

	.scale = 2,

};



/* BT.601 YUV limited-range to RGB full-range */

static const struct ipu_ic_csc_params yuvl2rgbf_601 = {

	.coeff = {

		{   75,    0,  102, },

		{   75,  -25,  -52, },

		{   75,  129,    0, },

	},

	.offset = { -223, 136, -277, },

	.scale = 3,

};



/* BT.601 YUV limited-range to RGB limited-range */

static const struct ipu_ic_csc_params yuvl2rgbl_601 = {

	.coeff = {

		{  128,    0,  175, },

		{  128,  -43,  -89, },

		{  128,  222,    0, },

	},

	.offset = { -351, 265, -443, },

	.scale = 2,

};



static const struct ipu_ic_csc_params *rgb2yuv_601[] = {

	&rgbf2yuvf_601,

	&rgbf2yuvl_601,

	&rgbl2yuvf_601,

	&rgbl2yuvl_601,

};



static const struct ipu_ic_csc_params *yuv2rgb_601[] = {

	&yuvf2rgbf_601,

	&yuvf2rgbl_601,

	&yuvl2rgbf_601,

	&yuvl2rgbl_601,

};



static int calc_csc_coeffs(struct ipu_ic_csc *csc)

{

	if (csc->out_cs.enc != V4L2_YCBCR_ENC_601)

		return -ENOTSUPP;

	const struct ipu_ic_csc_params **params_tbl;

	int tbl_idx;



	if ((csc->in_cs.cs == IPUV3_COLORSPACE_YUV &&

	     csc->in_cs.quant != V4L2_QUANTIZATION_FULL_RANGE) ||

	    (csc->out_cs.cs == IPUV3_COLORSPACE_YUV &&

	     csc->out_cs.quant != V4L2_QUANTIZATION_FULL_RANGE))

	if (csc->out_cs.enc != V4L2_YCBCR_ENC_601)

		return -ENOTSUPP;



	if ((csc->in_cs.cs == IPUV3_COLORSPACE_RGB &&

	     csc->in_cs.quant != V4L2_QUANTIZATION_FULL_RANGE) ||

	    (csc->out_cs.cs == IPUV3_COLORSPACE_RGB &&

	     csc->out_cs.quant != V4L2_QUANTIZATION_FULL_RANGE))

		return -ENOTSUPP;

	tbl_idx = (QUANT_MAP(csc->in_cs.quant) << 1) |

		QUANT_MAP(csc->out_cs.quant);



	if (csc->in_cs.cs == csc->out_cs.cs) {

		csc->params = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?

			*yuv2yuv[0] : *rgb2rgb[0];

			*yuv2yuv[tbl_idx] : *rgb2rgb[tbl_idx];



		return 0;

	}



	csc->params = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?

		*yuv2rgb_601[0] : *rgb2yuv_601[0];

	/* YUV <-> RGB encoding is required */



	params_tbl = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?

		yuv2rgb_601 : rgb2yuv_601;



	csc->params = *params_tbl[tbl_idx];



	return 0;

}