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Date:   Fri, 23 Dec 2016 16:07:49 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Vladimir Barinov <vladimir.barinov@...entembedded.com>,
        Artemi Ivanov <artemi.ivanov@...entembedded.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: arm64: mm: bug around swiotlb_dma_ops

> If trying to avoid big changes and only fixing particular problem with
> particular device not working on arm64, I think best way is to
> alter__swiotlb_dma_supported() in arch/arm64/mm/dma-mapping.c to detect
> and decline (with -EIO) mask that is unsupported by device connection.
> This will cover both dma_mask and coherent_dma_mask.
> 
> This has to be combined with some way to explicitly extract information
> about limitations. Checking device parent's dma masks won't work unless
> somebody bothers to populate them.

I'm trying to bring together a patch doing this, will post that when ready

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