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Subject: Re: [PATCH v3 6/7] drm/meson: overlay: setup overlay for Amlogic FBC
 Memory Saving mode
To:     daniel@ffwll.ch, dri-devel@lists.freedesktop.org
Cc:     ppaalanen@gmail.com, mjourdan@baylibre.com, brian.starkey@arm.com,
        linux-amlogic@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20200324142016.31824-1-narmstrong@baylibre.com>
 <20200324142016.31824-7-narmstrong@baylibre.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <1bb8c27c-7dcf-8833-ee13-f7227336179b@baylibre.com>
Date:   Tue, 24 Mar 2020 15:24:17 +0100
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Sender: linux-kernel-owner@vger.kernel.org
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On 24/03/2020 15:20, Neil Armstrong wrote:
> Setup the Amlogic FBC decoder for the VD1 video overlay plane to use
> a different superblock size for the Memory Saving mode.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/gpu/drm/meson/meson_overlay.c | 14 ++++++++++++--
>  include/uapi/drm/drm_fourcc.h         | 16 +++++++++++++++-
>  2 files changed, 27 insertions(+), 3 deletions(-)
> 

[...]

> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -840,6 +840,19 @@ extern "C" {
>   */
>  #define DRM_FORMAT_MOD_AMLOGIC_FBC_LAYOUT_BASIC		(1ULL << 0)
>  
> +/*
> + * Amlogic FBC Scatter Memory layout
> + *
> + * Indicates the header contains IOMMU references to the compressed
> + * frames content to optimize memory access and layout.
> + *
> + * In this mode, only the header memory address is needed, thus the
> + * content memory organization is tied to the current producer
> + * execution and cannot be saved/dumped neither transferrable between
> + * Amlogic SoCs supporting this modifier.
> + */
> +#define DRM_FORMAT_MOD_AMLOGIC_FBC_LAYOUT_SCATTER	(2ULL << 0)
> +
>  /*
>   * Amlogic FBC Layout Options
>   */
> @@ -852,7 +865,8 @@ extern "C" {
>   * memory.
>   *
>   * This mode reduces body layout to 3072 bytes per 64x32 superblock with
> - * the basic layout.
> + * the basic layout and 3200 bytes per 64x32 superblock combined with
> + * the scatter layout.
>   */
>  #define DRM_FORMAT_MOD_AMLOGIC_FBC_MEM_SAVING	(1ULL << 8)
>  
> 

Oops a commit got lost in the process... this change should be independent.

Neil