linux-kernel - Re: [PATCH] i2c: stm32f7: Add atomic

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Message-Id: <48234852-3206-4F73-A7AD-EE6EBE83D774@geanix.com>
Date:   Mon, 3 Jul 2023 12:21:02 +0200
From:   Sean Nyekjaer <sean@...nix.com>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     Pierre-Yves MORDRET <pierre-yves.mordret@...s.st.com>,
        Alain Volmat <alain.volmat@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-i2c@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: stm32f7: Add atomic_xfer method to driver



> On 3 Jul 2023, at 11.50, Wolfram Sang <wsa@...nel.org> wrote:
> 
> 
>>> Will DMA actually run in atomic mode?
> 
>> Atomic is mainly(only) used for writing a single register in the PMIC
>> for the stpmic.
> 
> And this most probably during shutdown...
> 
>> Guess that will not trigger any DMA use.
> 
> ... so I'd be very surprised if DMA is operational that late. I think we
> can rule that out independent of I2C messages to be trasnferred.
> 

Yes, I’ll submit a V2 without the DMA functionality.

/Sean