linux-kernel - Re: [PATCH] iommu/dart: Initialize DART_STREAMS

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Message-ID: <YXkJBXCnzZ/MgYFV@8bytes.org>
Date:   Wed, 27 Oct 2021 10:08:37 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Martin Povišer <povik@...tonmail.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Hector Martin <marcan@...can.st>,
        Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/dart: Initialize DART_STREAMS_ENABLE

On Tue, Oct 19, 2021 at 06:22:53PM +0200, Sven Peter wrote:
> DART has an additional global register to control which streams are
> isolated. This register is a bit redundant since DART_TCR can already
> be used to control isolation and is usually initialized to DART_STREAM_ALL
> by the time we get control. Some DARTs (namely the one used for the audio
> controller) however have some streams disabled initially. Make sure those
> work by initializing DART_STREAMS_ENABLE during reset.
> 
> Reported-by: Martin Povišer <povik@...tonmail.com>
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---

Applied, thanks.