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Date: Fri, 8 Feb 2019 11:14:58 -0800
From: Steve Longerbeam <slongerbeam@...il.com>
To: Tim Harvey <tharvey@...eworks.com>
Cc: linux-media <linux-media@...r.kernel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
"open list:DRM DRIVERS FOR FREESCALE IMX"
<dri-devel@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
"open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH 2/3] gpu: ipu-v3: ipu-ic: Add support for BT.709 encoding
On 2/8/19 8:24 AM, Tim Harvey wrote:
> On Sun, Feb 3, 2019 at 11:48 AM Steve Longerbeam <slongerbeam@...il.com> wrote:
>> Pass v4l2 encoding enum to the ipu_ic task init functions, and add
>> support for the BT.709 encoding and inverse encoding matrices.
>>
>> Reported-by: Tim Harvey <tharvey@...eworks.com>
>> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
>> ---
>> drivers/gpu/ipu-v3/ipu-ic.c | 67 ++++++++++++++++++---
>> drivers/gpu/ipu-v3/ipu-image-convert.c | 1 +
>> drivers/staging/media/imx/imx-ic-prpencvf.c | 4 +-
>> include/video/imx-ipu-v3.h | 5 +-
>> 4 files changed, 67 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/gpu/ipu-v3/ipu-ic.c b/drivers/gpu/ipu-v3/ipu-ic.c
>> index 35ae86ff0585..63362b4fff81 100644
>> --- a/drivers/gpu/ipu-v3/ipu-ic.c
>> +++ b/drivers/gpu/ipu-v3/ipu-ic.c
>> @@ -199,6 +199,23 @@ static const struct ic_csc_params ic_csc_rgb2ycbcr_bt601 = {
>> .scale = 1,
>> };
>>
>> +/*
>> + * BT.709 encoding from RGB full range to YUV limited range:
>> + *
>> + * Y = R * .2126 + G * .7152 + B * .0722;
>> + * U = R * -.1146 + G * -.3854 + B * .5000 + 128.;
>> + * V = R * .5000 + G * -.4542 + B * -.0458 + 128.;
>> + */
>> +static const struct ic_csc_params ic_csc_rgb2ycbcr_bt709 = {
>> + .coeff = {
>> + { 54, 183, 18 },
>> + { 483, 413, 128 },
>> + { 128, 396, 500 },
>> + },
>> + .offset = { 0, 512, 512 },
>> + .scale = 1,
>> +};
>> +
>> /* transparent RGB->RGB matrix for graphics combining */
>> static const struct ic_csc_params ic_csc_rgb2rgb = {
>> .coeff = {
>> @@ -226,12 +243,31 @@ static const struct ic_csc_params ic_csc_ycbcr2rgb_bt601 = {
>> .scale = 2,
>> };
>>
>> +/*
>> + * Inverse BT.709 encoding from YUV limited range to RGB full range:
>> + *
>> + * R = (1. * (Y - 16)) + (1.5748 * (Cr - 128));
>> + * G = (1. * (Y - 16)) - (0.1873 * (Cb - 128)) - (0.4681 * (Cr - 128));
>> + * B = (1. * (Y - 16)) + (1.8556 * (Cb - 128);
>> + */
>> +static const struct ic_csc_params ic_csc_ycbcr2rgb_bt709 = {
>> + .coeff = {
>> + { 128, 0, 202 },
>> + { 128, 488, 452 },
>> + { 128, 238, 0 },
>> + },
>> + .offset = { -435, 136, -507 },
>> + .scale = 2,
>> +};
>> +
>> static int init_csc(struct ipu_ic *ic,
>> enum ipu_color_space inf,
>> enum ipu_color_space outf,
>> + enum v4l2_ycbcr_encoding encoding,
>> int csc_index)
>> {
>> struct ipu_ic_priv *priv = ic->priv;
>> + const struct ic_csc_params *params_rgb2yuv, *params_yuv2rgb;
>> const struct ic_csc_params *params;
>> u32 __iomem *base;
>> const u16 (*c)[3];
>> @@ -241,10 +277,24 @@ static int init_csc(struct ipu_ic *ic,
>> base = (u32 __iomem *)
>> (priv->tpmem_base + ic->reg->tpmem_csc[csc_index]);
>>
>> + switch (encoding) {
>> + case V4L2_YCBCR_ENC_601:
>> + params_rgb2yuv = &ic_csc_rgb2ycbcr_bt601;
>> + params_yuv2rgb = &ic_csc_ycbcr2rgb_bt601;
>> + break;
>> + case V4L2_YCBCR_ENC_709:
>> + params_rgb2yuv = &ic_csc_rgb2ycbcr_bt709;
>> + params_yuv2rgb = &ic_csc_ycbcr2rgb_bt709;
>> + break;
>> + default:
>> + dev_err(priv->ipu->dev, "Unsupported YCbCr encoding\n");
>> + return -EINVAL;
>> + }
>> +
> Steve,
>
> This will fail for RGB to RGB with 'Unsupported YCbCr encoding. We
> need to account for the RGB->RGB case.
>
> How about something like:
Thanks for reporting Tim
I rather keep the check for supported encoding, and instead get rid of
"Unsupported color space conversion" error, because that is the YUV->YUV
case which can be allowed using the identity matrix.
Steve
>
> static int init_csc(struct ipu_ic *ic,
> enum ipu_color_space inf,
> enum ipu_color_space outf,
> + enum v4l2_ycbcr_encoding encoding,
> int csc_index)
> {
> struct ipu_ic_priv *priv = ic->priv;
> - const struct ic_csc_params *params;
> + const struct ic_csc_params *params = NULL;
> u32 __iomem *base;
> const u16 (*c)[3];
> const u16 *a;
> @@ -241,13 +276,18 @@ static int init_csc(struct ipu_ic *ic,
> base = (u32 __iomem *)
> (priv->tpmem_base + ic->reg->tpmem_csc[csc_index]);
>
> - if (inf == IPUV3_COLORSPACE_YUV && outf == IPUV3_COLORSPACE_RGB)
> - params = &ic_csc_ycbcr2rgb_bt601;
> - else if (inf == IPUV3_COLORSPACE_RGB && outf == IPUV3_COLORSPACE_YUV)
> - params = &ic_csc_rgb2ycbcr_bt601;
> + if (inf == IPUV3_COLORSPACE_YUV && outf == IPUV3_COLORSPACE_RGB) {
> + params = (encoding == V4L2_YCBCR_ENC_601) ?
> + &ic_csc_ycbcr2rgb_bt601 : &ic_csc_ycbcr2rgb_bt709;
> + }
> + else if (inf == IPUV3_COLORSPACE_RGB && outf == IPUV3_COLORSPACE_YUV) {
> + params = (encoding == V4L2_YCBCR_ENC_601) ?
> + &ic_csc_rgb2ycbcr_bt601 : &ic_csc_rgb2ycbcr_bt709;
> + }
> else if (inf == IPUV3_COLORSPACE_RGB && outf == IPUV3_COLORSPACE_RGB)
> params = &ic_csc_rgb2rgb;
> - else {
> +
> + if (!params) {
> dev_err(priv->ipu->dev, "Unsupported color space conversion\n");
> return -EINVAL;
> }
>
> Tim
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