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

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Message-ID: <ZKKZ4qUw5pKVt1T1@shikoro>
Date:   Mon, 3 Jul 2023 11:50:26 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Sean Nyekjaer <sean@...nix.com>
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


> > 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.


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