linux-kernel - Re: [PATCH 2/3] i2c: owl: Add support for atomic transfers

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Message-ID: <20201012090753.GB73734@ubuntu2004>
Date:   Mon, 12 Oct 2020 12:07:53 +0300
From:   Cristian Ciocaltea <cristian.ciocaltea@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Andreas Färber <afaerber@...e.de>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-actions@...ts.infradead.org
Subject: Re: [PATCH 2/3] i2c: owl: Add support for atomic transfers

On Sun, Oct 11, 2020 at 07:39:20PM +0530, Manivannan Sadhasivam wrote:
> On Fri, Oct 09, 2020 at 12:44:40AM +0300, Cristian Ciocaltea wrote:
> > Atomic transfers are required to properly power off a machine through
> > an I2C controlled PMIC, such as the Actions Semi ATC260x series.
> > 
> > System shutdown may happen with interrupts being disabled and, as a
> > consequence, the kernel may hang if the driver does not support atomic
> > transfers.
> > 
> > This functionality is essentially implemented by polling the FIFO
> > Status register until either Command Execute Completed or NACK Error
> > bits are set.
> > 
> > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...il.com>
> 
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Thanks,
> Mani

Thanks for reviewing,
Cristi