Re: [PATCH v3 03/19] drm: add msm compressed format modifiers

[Stanimir Varbanov <stanimir.varbanov-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

Hi,

On 07/20/2018 11:42 PM, Sean Paul wrote:
> From: Jeykumar Sankaran <jsanka@codeaurora.org>
> 
> Qualcomm Snapdragon chipsets uses compressed format
> to optimize BW across multiple IP's. This change adds
> needed modifier support in drm for a simple 4x4 tile
> based compressed variants of base formats.
> 
> Changes in v3:
> - Removed duplicate entry for DRM_FORMAT_MOD_QCOM_COMPRESSED (Rob Clark)
> 
> Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>  include/uapi/drm/drm_fourcc.h | 37 +++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index e04613d30a13..1c9a6bf8c81e 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -298,6 +298,43 @@ extern "C" {
>   */
>  #define DRM_FORMAT_MOD_SAMSUNG_64_32_TILE	fourcc_mod_code(SAMSUNG, 1)
>  
> +/*
> + * Qualcomm Compressed Format
> + *
> + * Refers to a compressed variant of the base format that is compressed.
> + * Implementation may be platform and base-format specific.
> + *
> + * Each macrotile consists of m x n (mostly 4 x 4) tiles.
> + * Pixel data pitch/stride is aligned with macrotile width.
> + * Pixel data height is aligned with macrotile height.
> + * Entire pixel data buffer is aligned with 4k(bytes).
> + */
> +#define DRM_FORMAT_MOD_QCOM_COMPRESSED	fourcc_mod_code(QCOM, 1)
> +
> +/*
> + * QTI DX Format
> + *
> + * Refers to a DX variant of the base format.
> + * Implementation may be platform and base-format specific.
> + */
> +#define DRM_FORMAT_MOD_QCOM_DX	fourcc_mod_code(QCOM, 0x2)

What DX stands for?


-- 
regards,
Stan
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