linux-kernel - Re: [PATCH v2 1/2] i2c: tegra: Better handle case where CPU0 is busy for a long time

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Date:   Mon, 27 Apr 2020 17:32:44 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        Vidya Sagar <vidyas@...dia.com>, linux-i2c@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] i2c: tegra: Better handle case where CPU0 is busy
 for a long time

On Mon, Apr 27, 2020 at 12:50:29PM +0200, Thierry Reding wrote:
> On Mon, Apr 27, 2020 at 12:35:53PM +0200, Wolfram Sang wrote:
> > On Mon, Apr 27, 2020 at 12:07:19PM +0300, Dmitry Osipenko wrote:
> > > 27.04.2020 11:44, Wolfram Sang пишет:
> > > > 
> > > >> Wolfram, can you revert the following two patches for v5.7, please?
> > > >>
> > > >> 	8814044fe0fa i2c: tegra: Synchronize DMA before termination
> > > 
> > > This patch has nothing to do with your trouble, why do you want to
> > > revert it?
> > 
> > I'll wait some more before pushing out, so you can discuss it.
> 
> Okay, let me run a quick test with that second patch still applied to
> make sure it really is harmless.

Alright, I tested v5.7-rc3 with this patch reverted:

	a900aeac2537 i2c: tegra: Better handle case where CPU0 is busy for a long time

and the results came back positive, so I think we can leave patch:

	8814044fe0fa i2c: tegra: Synchronize DMA before termination

in. But then again, I see that Dmitry posted this yesterday:

	https://lkml.org/lkml/2020/4/26/481

which seems like it would be related to this and potentially be a
follow-up fix for some corner cases? So I'm not sure how well this whole
set has been tested yet.

Maybe a better solution would be for the DMA synchronization patch to go
into the 5.8 queue instead to make sure we get more testing cycles.

Thierry

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