linux-kernel - Re: [PATCH v1 v1 4/7] drm/fourcc: Add drm/vs tiled modifiers

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Date:   Wed, 6 Sep 2023 13:50:02 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Keith Zhao <keith.zhao@...rfivetech.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        christian.koenig@....com, Bjorn Andersson <andersson@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Shawn Guo <shawnguo@...nel.org>, Jagan Teki <jagan@...eble.ai>,
        Chris Morgan <macromorgan@...mail.com>,
        Jack Zhu <jack.zhu@...rfivetech.com>,
        Shengyang Chen <shengyang.chen@...rfivetech.com>,
        Changhuang Liang <changhuang.liang@...rfivetech.com>
Subject: Re: [PATCH v1 v1 4/7] drm/fourcc: Add drm/vs tiled modifiers

Hi

Am 01.08.23 um 12:10 schrieb Keith Zhao:
> These are mainly used internally in vs-drm,
> I'm not sure if the new modifiers can be used with the existing ones.
> If there is a problem, I will improve it further.
> 
> Signed-off-by: Keith Zhao <keith.zhao@...rfivetech.com>
> ---
>   include/uapi/drm/drm_fourcc.h | 27 +++++++++++++++++++++++++++
>   1 file changed, 27 insertions(+)
> 
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 8db7fd3f7..0b884cf50 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -419,6 +419,7 @@ extern "C" {
>   #define DRM_FORMAT_MOD_VENDOR_ARM     0x08
>   #define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
>   #define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a
> +#define DRM_FORMAT_MOD_VENDOR_VS      0x0b
>   
>   /* add more to the end as needed */
>   
> @@ -1562,6 +1563,32 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
>   #define AMD_FMT_MOD_CLEAR(field) \
>   	(~((__u64)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
>   
> +#define DRM_FORMAT_MOD_VS_TYPE_NORMAL        0x00
> +#define DRM_FORMAT_MOD_VS_TYPE_COMPRESSED    0x01
> +#define DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT  0x02
> +#define DRM_FORMAT_MOD_VS_TYPE_MASK     ((__u64)0x3 << 54)
> +
> +#define fourcc_mod_vs_code(type, val) \
> +	fourcc_mod_code(VS, ((((__u64)type) << 54) | (val)))
> +
> +#define DRM_FORMAT_MOD_VS_NORM_MODE_MASK        0x1F

> +#define DRM_FORMAT_MOD_VS_LINEAR                0x00

This define should be removed if it does the same as DRM_FORMAT_MODE_LINEAR.

> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR    0x02
> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR    0x03
> +#define DRM_FORMAT_MOD_VS_TILE_8X8              0x04
> +#define DRM_FORMAT_MOD_VS_TILE_8X4              0x07
> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR_8X4    0x0B
> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR_4X8    0x0C
> +#define DRM_FORMAT_MOD_VS_TILE_MODE4X4          0x15
> +

The existing formats in this file have documentation on their effects 
and meaning. You should include similar comments here.

Best regards
Thomas

> +#define fourcc_mod_vs_norm_code(tile) \
> +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_NORMAL, \
> +				(tile))
> +
> +#define fourcc_mod_vs_custom_code(tile) \
> +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT, \
> +				(tile))
> +
>   #if defined(__cplusplus)
>   }
>   #endif

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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