linux-kernel - Re: [PATCH v2 2/3] powerpc/fsl: set fsl, i2c-erratum-a004447 flag for P2041 i2c controllers

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Message-ID: <aac3f1d2-adba-a77a-3d87-551b073223d4@alliedtelesis.co.nz>
Date:   Sun, 9 May 2021 21:11:57 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "wsa@...nel.org" <wsa@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] powerpc/fsl: set fsl, i2c-erratum-a004447 flag for
 P2041 i2c controllers


On 7/05/21 8:24 pm, Joakim Tjernlund wrote:
> On Fri, 2021-05-07 at 10:04 +0200, Joakim Tjernlund wrote:
>> On Fri, 2021-05-07 at 12:40 +1200, Chris Packham wrote:
>>> The i2c controllers on the P2040/P2041 have an erratum where the
>>> documented scheme for i2c bus recovery will not work (A-004447). A
>>> different mechanism is needed which is documented in the P2040 Chip
>>> Errata Rev Q (latest available at the time of writing).
>>  From what I can tell this Erratum also applies to P1010
Will add for v3.
>>   Jocke
> Reference: https://media.digikey.com/pdf/PCNs/Freescale/P1010CE_RevL.pdf
>
> Also, I think this series should go to stable.
This series builds on changes that have been merged for v5.13. I haven't 
checked if it applies to stable, I think at least commit 65171b2df15e 
("i2c: mpc: Make use of i2c_recover_bus()") would need to come along 
with it.