linux-kernel - Re: [PATCH v3] i2c: piix4: Disable completely the IMC during SMBUS_BLOCK

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Message-ID: <20171013190326.gozfjhmv2pbmnrgt@ninjato>
Date:   Fri, 13 Oct 2017 21:03:26 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Jean Delvare <jdelvare@...e.de>, linux-i2c@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] i2c: piix4: Disable completely the IMC during
 SMBUS_BLOCK_DATA

On Tue, Oct 10, 2017 at 06:11:15PM +0200, Ricardo Ribalda Delgado wrote:
> SMBUS_BLOCK_DATA transactions might fail due to a race condition with
> the IMC (Integrated Micro Controller), even when the IMC semaphore
> is used.
> 
> This bug has been reported and confirmed by AMD, who suggested as a
> solution an IMC firmware upgrade (obtained via BIOS update) and
> disabling the IMC during SMBUS_BLOCK_DATA transactions.
> 
> Even without the IMC upgrade, the SMBUS is much more stable with this
> patch.
> 
> Tested on a Bettong-alike board.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>

Applied to for-current, thanks!


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