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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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