linux-kernel - Re: [PATCH v8 1/6] drm/fourcc: Add modifier definitions for describing Amlogic Video Framebuffer Compression

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Message-ID: <8cBfZpkc4pHBLhihlvJMD_Hq1DEsNRcSY4Y8JaGwklMWcxiYzUMVEx7wH9f_DuCBMVUhXvOR0PcHVslILtKI2wdw79Nfih0N3VnrxfMQd08=@emersion.fr>
Date:   Thu, 02 Jul 2020 09:23:11 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "jianxin.pan@...ogic.com" <jianxin.pan@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 1/6] drm/fourcc: Add modifier definitions for describing Amlogic Video Framebuffer Compression

On Thursday, July 2, 2020 9:47 AM, Neil Armstrong <narmstrong@...libre.com> wrote:

> Finally is also adds the Scatter Memory layout, meaning 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.

Still not sure how to handle this one, since this breaks fundamental
assumptions about modifiers.