linux-kernel - Re: [PATCH v4 1/1] i2c: algo-pca: Reapply i2c bus settings after reset

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Message-ID: <20200911194526.GB909@ninjato>
Date:   Fri, 11 Sep 2020 21:45:26 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     Evan Nimmo <Evan.Nimmo@...iedtelesis.co.nz>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "jarkko.nikula@...ux.intel.com" <jarkko.nikula@...ux.intel.com>,
        "jdelvare@...e.de" <jdelvare@...e.de>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/1] i2c: algo-pca: Reapply i2c bus settings after
 reset

On Wed, Sep 09, 2020 at 08:39:50PM +0000, Chris Packham wrote:
> 
> On 9/09/20 8:23 pm, Wolfram Sang wrote:
> > On Wed, Sep 09, 2020 at 08:32:47AM +1200, Evan Nimmo wrote:
> >> If something goes wrong (such as the SCL being stuck low) then we need
> >> to reset the PCA chip. The issue with this is that on reset we lose all
> >> config settings and the chip ends up in a disabled state which results
> >> in a lock up/high CPU usage. We need to re-apply any configuration that
> >> had previously been set and re-enable the chip.
> >>
> >> Signed-off-by: Evan Nimmo <evan.nimmo@...iedtelesis.co.nz>
> >> Reviewed-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> >> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> >> Reviewed-by: Wolfram Sang <wsa@...nel.org>
> > Applied to for-current, thanks!
> >
> > For the record, were you able to test both, PCA9564 and PCA9665?
> >
> Our hardware platforms only have PCA9665 so that's all we can test.

Okay, good to know. BTW, just after I sent out my pull request
containing this patch, I noticed there is no Fixes: tag. So, if you want
this patch to be backported, please send it to stable@ once my
pull-request is in Linus' tree.


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