linux-kernel - Re: [PATCH] i2c: brcmstb: Add support for atomic transfers

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Date:   Wed, 11 Oct 2023 11:57:00 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Florian Fainelli <florian.fainelli@...adcom.com>,
        linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Kamal Dasu <kamal.dasu@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Wolfram Sang <wsa@...nel.org>
Subject: Re: [PATCH] i2c: brcmstb: Add support for atomic transfers

On 09.10.2023 22:41, Florian Fainelli wrote:
> On 10/6/23 07:41, Marek Szyprowski wrote:
>> Add support for atomic transfers using polling mode with interrupts
>> intentionally disabled to get rid of the warning introduced by commit
>> 63b96983a5dd ("i2c: core: introduce callbacks for atomic transfers")
>> during system reboot and power-off.
>
> Is there an existing system that you have access to which needs atomic 
> transfer support, or is this a forward looking change?

Frankly speaking I've observed the mentioned warning during system 
reboot on RaspberryPi4 with linux-next kernel compiled from 
multi_v7_defconfig. It looks that this driver is used by VC4 DRM for 
DDC. This issue doesn't look critical, but the fix seems to be trivial, 
thus my patch.


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland