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

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Date:   Thu, 5 Jan 2023 14:19:32 +0900
From:   Hector Martin <marcan@...can.st>
To:     Sven Peter <sven@...npeter.dev>, 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

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.

- Hector