linux-kernel - Re: [PATCH v2] i2c: cadence: try reset when master receive arbitration lost

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Message-ID: <20190223094842.GF1018@kunai>
Date:   Sat, 23 Feb 2019 10:48:43 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Shikai Wang <sxauwsk@....com>
Cc:     Michal Simek <michal.simek@...inx.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c: cadence: try reset when master receive
 arbitration lost

On Tue, Feb 19, 2019 at 09:24:47AM +0800, Shikai Wang wrote:
> When the adapter receive arbitration lost error interrupts,
> cdns_i2c_master_xfer return to the caller directly instead of resetting
> the adapter which resulted in the adapter being out of control.
> 
> So when driver detect err_status such as arbitration lost,
> then try to repair and fix it.

Just checking because resetting looks like a big hammer to me: there is
no way to gracefully recover form 'arbitration lost' interrupt?


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