linux-kernel - Re: [PATCH 7/7] iommu: dart: Add t8110 DART support

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Message-Id: <bfee5a64-bb7c-43ee-a2ca-7e13421508f4@app.fastmail.com>
Date:   Thu, 05 Jan 2023 10:45:29 +0100
From:   "Sven Peter" <sven@...npeter.dev>
To:     "Hector Martin" <marcan@...can.st>,
        "Joerg Roedel" <joro@...tes.org>, "Will Deacon" <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>
Cc:     "Alyssa Rosenzweig" <alyssa@...enzweig.io>,
        "Janne Grunau" <j@...nau.net>, "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, iommu@...ts.linux.dev,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] iommu: dart: Add t8110 DART support

Hi,

On Thu, Jan 5, 2023, at 06:19, Hector Martin wrote:
> On 2023/01/04 22:50, Sven Peter wrote:
>> Do you have any more details on this registers? For the 8103 DART
>> we called it _CONFIG but I assume for the t8110 DART it can
>> actually lock different parts of the HW instead of just a global lock?
>
> This is based on R's reverse engineering here:
>
> https://github.com/AsahiLinux/m1n1/blob/main/proxyclient/m1n1/hw/dart8110.py#L87
>
> I don't think they ever fully nailed down exactly what the lock bit
> behavior is, though.

Fair enough, I was mostly curious if it was actually _PROTECT and not just
_CONFIG with different bit assignments. Sounds like it does mostly set up
protections though.


Sven