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

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Message-ID: <YLCmLNDUqe/AiQ+I@kunai>
Date:   Fri, 28 May 2021 10:13:32 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Qii Wang <qii.wang@...iatek.com>
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 Fri, May 28, 2021 at 09:37:43AM +0800, Qii Wang wrote:
> 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")

Added this tag and applied to for-current, thanks!


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