On Wed, Nov 23, 2022 at 05:19:57PM +0800, Hsia-Jun Li wrote:
> From: "Hsia-Jun(Randy) Li" <randy.li@xxxxxxxxxxxxx>
>
> Memory Traffic Reduction(MTR) is a module in Synaptics
> VideoSmart platform could process lossless compression image
> and cache the tile memory line.
>
> Those modifiers only record the parameters would effort pixel
> layout or memory layout. Whether physical memory page mapping
> is used is not a part of format.
>
> We would allocate the same size of memory for uncompressed
> and compressed luma and chroma data, while the compressed buffer
> would request two extra planes holding the metadata for
> the decompression.
>
> Signed-off-by: Hsia-Jun(Randy) Li <randy.li@xxxxxxxxxxxxx>
> ---
> include/uapi/drm/drm_fourcc.h | 75 +++++++++++++++++++++++++++++++++++
> 1 file changed, 75 insertions(+)
>
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index bc056f2d537d..ca0b4ca70b36 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -407,6 +407,7 @@ 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_SYNAPTICS 0x0b
Any users in the mainline tree?
>
> /* add more to the end as needed */
>
> @@ -1507,6 +1508,80 @@ 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))
>
> +/*
> + * Synaptics VideoSmart modifiers
> + *
> + * Tiles could be arranged in Groups of Tiles (GOTs), it is a small tile
> + * within a tile. GOT size and layout varies based on platform and
> + * performance concern. When the compression is applied, it is possible
> + * that we would have two tile type in the GOT, these parameters can't
> + * tell the secondary tile type.
> + *
> + * Besides, an 8 size 4 bytes arrary (32 bytes) would be need to store
> + * some compression parameters for a compression meta data plane.
> + *
> + * Macro
> + * Bits Param Description
> + * ---- ----- -----------------------------------------------------------------
> + *
> + * 7:0 f Scan direction description.
> + *
> + * 0 = Invalid
> + * 1 = V4, the scan would always start from vertical for 4 pixel
> + * then move back to the start pixel of the next horizontal
> + * direction.
> + * 2 = Reserved for future use.
> + *
> + * 15:8 m The times of pattern repeat in the right angle direction from
> + * the first scan direction.
> + *
> + * 19:16 p The padding bits after the whole scan, could be zero.
> + *
> + * 20:20 g GOT packing flag.
> + *
> + * 23:21 - Reserved for future use. Must be zero.
> + *
> + * 27:24 h log2(horizontal) of bytes, in GOTs.
> + *
> + * 31:28 v log2(vertical) of bytes, in GOTs.
> + *
> + * 35:32 - Reserved for future use. Must be zero.
> + *
> + * 36:36 c Compression flag.
> + *
> + * 55:37 - Reserved for future use. Must be zero.
> + *
> + */
> +
> +#define DRM_FORMAT_MOD_SYNA_V4_TILED fourcc_mod_code(SYNAPTICS, 1)
> +
> +#define DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(f, m, p, g, h, v, c) \
> + fourcc_mod_code(SYNAPTICS, ((__u64)((f) & 0xff) | \
> + ((__u64)((m) & 0xff) << 8) | \
> + ((__u64)((p) & 0xf) << 16) | \
> + ((__u64)((g) & 0x1) << 20) | \
> + ((__u64)((h) & 0xf) << 24) | \
> + ((__u64)((v) & 0xf) << 28) | \
> + ((__u64)((c) & 0x1) << 36)))
> +
> +#define DRM_FORMAT_MOD_SYNA_V4H1 \
> + DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(1, 1, 0, 0, 0, 0, 0)
> +
> +#define DRM_FORMAT_MOD_SYNA_V4H3P8 \
> + DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(1, 3, 8, 0, 0, 0, 0)
> +
> +#define DRM_FORMAT_MOD_SYNA_V4H1_64L4_COMPRESSED \
> + DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(1, 1, 0, 1, 6, 2, 1)
> +
> +#define DRM_FORMAT_MOD_SYNA_V4H3P8_64L4_COMPRESSED \
> + DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(1, 3, 8, 1, 6, 2, 1)
> +
> +#define DRM_FORMAT_MOD_SYNA_V4H1_128L128_COMPRESSED \
> + DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(1, 1, 0, 1, 7, 7, 1)
> +
> +#define DRM_FORMAT_MOD_SYNA_V4H3P8_128L128_COMPRESSED \
> + DRM_FORMAT_MOD_SYNA_MTR_LINEAR_2D(1, 3, 8, 1, 7, 7, 1)
> +
> #if defined(__cplusplus)
> }
> #endif
> --
> 2.17.1
>
