linux-kernel - Re: [PATCH v2] i2c: aspeed: Fix i2c bus hang in slave read

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Date:   Fri, 29 Sep 2023 09:39:37 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Jian Zhang <zhangjian.3032@...edance.com>
Cc:     brendan.higgins@...ux.dev, benh@...nel.crashing.org,
        joel@....id.au, andrew@...id.au, zhangjian3032@...il.com,
        yulei.sh@...edance.com, xiexinnan@...edance.com,
        Andi Shyti <andi.shyti@...nel.org>,
        Tommy Huang <tommy_huang@...eedtech.com>,
        "open list:ARM/ASPEED I2C DRIVER" <linux-i2c@...r.kernel.org>,
        "moderated list:ARM/ASPEED I2C DRIVER" <openbmc@...ts.ozlabs.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] i2c: aspeed: Fix i2c bus hang in slave read

On Wed, Sep 27, 2023 at 11:42:43PM +0800, Jian Zhang wrote:
> When the `CONFIG_I2C_SLAVE` option is enabled and the device operates
> as a slave, a situation arises where the master sends a START signal
> without the accompanying STOP signal. This action results in a
> persistent I2C bus timeout. The core issue stems from the fact that
> the i2c controller remains in a slave read state without a timeout
> mechanism. As a consequence, the bus perpetually experiences timeouts.
> 
> In this case, the i2c bus will be reset, but the slave_state reset is
> missing.
> 
> Fixes: fee465150b45 ("i2c: aspeed: Reset the i2c controller when timeout occurs")
> Signed-off-by: Jian Zhang <zhangjian.3032@...edance.com>

Somebody wants to add tags here? I think it should go to my pull request
this week.


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