linux-kernel - Re: [PATCH 2/3] i2c-axxia: check for error conditions first

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Date:   Tue, 11 Dec 2018 21:05:27 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     "Adamski, Krzysztof (Nokia - PL/Wroclaw)" 
        <krzysztof.adamski@...ia.com>
Cc:     "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Tobias Jordan <Tobias.Jordan@...ktrobit.com>,
        Peter Rosin <peda@...ntia.se>
Subject: Re: [PATCH 2/3] i2c-axxia: check for error conditions first

On Mon, Dec 10, 2018 at 03:01:27PM +0000, Adamski, Krzysztof (Nokia - PL/Wroclaw) wrote:
> It was observed that when using seqentional mode contrary to the
> documentation, the SS bit (which is supposed to only be set if
> automatic/sequence command completed normally), is sometimes set
> together with NA (NAK in address phase) causing transfer to falsely be
> considered successful.
> 
> My assumption is that this does not happen during manual mode since the
> controller is stopping its work the moment it sets NA/ND bit in status
> register. This is not the case in Automatic/Sequentional mode where it
> is still working to send STOP condition and the actual status we get
> depends on the time when the ISR is run.
> 
> This patch changes the order of checking status bits in ISR - error
> conditions are checked first and only if none of them occurred, the
> transfer may be considered successful. This is required to introduce
> using of sequentional mode in next patch.
> 
> Signed-off-by: Krzysztof Adamski <krzysztof.adamski@...ia.com>

Applied to for-next, thanks!


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