linux-kernel - Re: [PATCH 5.3 076/148] mmc: sdhci-of-esdhc: set DMA snooping based on DMA coherence

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Date:   Thu, 10 Oct 2019 11:10:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 5.3 076/148] mmc: sdhci-of-esdhc: set DMA snooping based
 on DMA coherence

On Thu, Oct 10, 2019 at 09:49:12AM +0100, Russell King - ARM Linux admin wrote:
> Hi Greg,
> 
> On 5th October, Christian Zigotzky <chzigotzky@...osoft.de> reported a
> problem with this on PowerPC (at a guess, it looks like there's a
> PowerPC user of this where the DT does not mark the device as
> dma-coherent, but the hardware requires it to be DMA coherent.)
> 
> However, despite sending a reply to him within minutes of his email
> arriving, I've heard nothing since, so there's been no progress on
> working out what is really going on.
> 
> Given that the reporter hasn't responded to my reply, I'm not sure
> what we should be doing with this... maybe the reporter has solved
> his problem, maybe he was using an incorrect DT, we just don't know.

Let's just leave this in, and if this did cause a problem, whatever fix
is made will be sent to Linus and we can then take that fix into stable
as well.

thanks,

greg k-h