linux-kernel - Re: [Potential Spoof] Re: [PATCH 1/2] i2c: aspeed: allow to customize base clock divisor

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Message-ID: <4b939e17-f364-4e63-f254-17bd531f75e6@fb.com>
Date:   Fri, 21 Jun 2019 22:21:23 +0000
From:   Tao Ren <taoren@...com>
To:     Ryan Chen <ryan_chen@...eedtech.com>,
        Brendan Higgins <brendanhiggins@...gle.com>
CC:     Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Potential Spoof] Re: [PATCH 1/2] i2c: aspeed: allow to customize
 base clock divisor

On 6/20/19 1:13 AM, Tao Ren wrote:
> On 6/20/19 1:01 AM, Ryan Chen wrote:
>> Hello Tao,
>> 	Let me more clear. When you set (3, 15, 14) the device sometimes response nack. 
>> 	but when you set (4, 7, 7), the device always ack. Am I right? 
>> Ryan
> 
> Hello Ryan,
> 
> It's correct. We have seen the problem on 2 Facebook BMC platforms so far. Given the other ~10 Facebook BMC platforms are still running kernel 4.1 (with (4, 7, 7) settings), I'd assume more platforms will be impacted after upgrading to the latest kernel.
> 
> Thank you for spending time on this!

Just heads up Ryan and I are working with ODM vendors to collect scope output; will update back when we have new findings. Thank you all for spending time on this.


Cheers,

Tao