linux-kernel - Re: [PATCH 9/9] drm/vc4: hdmi: Add BT.2020 Support

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Message-ID: <31795464-8986-c2c3-74a2-3d2bc3455820@suse.de>
Date:   Wed, 11 Jan 2023 16:18:50 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Maxime Ripard <maxime@...no.tech>, Emma Anholt <emma@...olt.net>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH 9/9] drm/vc4: hdmi: Add BT.2020 Support



Am 07.12.22 um 17:07 schrieb Maxime Ripard:
> From: Dave Stevenson <dave.stevenson@...pberrypi.com>
> 
> Even though we report that we support the BT.2020 Colorspace, we were
> always using the BT.709 conversion matrices. Let's add the BT.2020 ones.
> 
> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   drivers/gpu/drm/vc4/vc4_hdmi.c | 38 ++++++++++++++++++++++++++++++++++++++
>   1 file changed, 38 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index e3428fb2c22d..2734cab34660 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1277,6 +1277,37 @@ static const u16 vc5_hdmi_csc_full_rgb_to_yuv_bt709[2][3][4] = {
>   	},
>   };
>   
> +/*
> + * Conversion between Full Range RGB and YUV using the BT.2020 Colorspace
> + *
> + * Matrices are signed 2p13 fixed point, with signed 9p6 offsets
> + */
> +static const u16 vc5_hdmi_csc_full_rgb_to_yuv_bt2020[2][3][4] = {
> +	{
> +		/*
> +		 * Full Range
> +		 *
> +		 * [  0.262700  0.678000  0.059300  0   ]
> +		 * [ -0.139630 -0.360370  0.500000  128 ]
> +		 * [  0.500000 -0.459786 -0.040214  128 ]
> +		 */
> +		{ 0x0868, 0x15b2, 0x01e6, 0x0000 },
> +		{ 0xfb89, 0xf479, 0x1000, 0x2000 },
> +		{ 0x1000, 0xf14a, 0xfeb8, 0x2000 },
> +	},
> +	{
> +		/* Limited Range
> +		 *
> +		 * [  0.224732  0.580008  0.050729  16  ]
> +		 * [ -0.122176 -0.315324  0.437500  128 ]
> +		 * [  0.437500 -0.402312 -0.035188  128 ]
> +		 */
> +		{ 0x082f, 0x1012, 0x031f, 0x0400 },
> +		{ 0xfb48, 0xf6ba, 0x0e00, 0x2000 },
> +		{ 0x0e00, 0xf448, 0xfdba, 0x2000 },
> +	},
> +};
> +
>   static void vc5_hdmi_set_csc_coeffs(struct vc4_hdmi *vc4_hdmi,
>   				    const u16 coeffs[3][4])
>   {
> @@ -1322,6 +1353,13 @@ static const u16
>   	case DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED:
>   	case DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT:
>   		return vc5_hdmi_csc_full_rgb_to_yuv_bt709[limited];
> +
> +	case DRM_MODE_COLORIMETRY_BT2020_CYCC:
> +	case DRM_MODE_COLORIMETRY_BT2020_YCC:
> +	case DRM_MODE_COLORIMETRY_BT2020_RGB:
> +	case DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65:
> +	case DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER:
> +		return vc5_hdmi_csc_full_rgb_to_yuv_bt2020[limited];
>   	}
>   }
>   
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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