linux-kernel - Re: [PATCH] i2c: mediatek: Disable i2c start_en and clear intr

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Message-ID: <1622165863.15667.3.camel@mhfsdcap03>
Date:   Fri, 28 May 2021 09:37:43 +0800
From:   Qii Wang <qii.wang@...iatek.com>
To:     Wolfram Sang <wsa@...-dreams.de>
CC:     <matthias.bgg@...il.com>, <linux-i2c@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <leilk.liu@...iatek.com>
Subject: Re: [PATCH] i2c: mediatek: Disable i2c start_en and clear intr_stat
 brfore reset

On Thu, 2021-05-27 at 22:14 +0200, Wolfram Sang wrote:
> On Thu, May 27, 2021 at 08:04:04PM +0800, qii.wang@...iatek.com wrote:
> > From: Qii Wang <qii.wang@...iatek.com>
> > 
> > The i2c controller driver do dma reset after transfer timeout,
> > but sometimes dma reset will trigger an unexpected DMA_ERR irq.
> > It will cause the i2c controller to continuously send interrupts
> > to the system and cause soft lock-up. So we need to disable i2c
> > start_en and clear intr_stat to stop i2c controller before dma
> > reset when transfer timeout.
> > 
> > Signed-off-by: Qii Wang <qii.wang@...iatek.com>
> 
> Is there a suitable Fixes tag for this?
> 

Can you help to add the following tag, thanks
Fixes: aafced673c06("i2c: mediatek: move dma reset before i2c reset")