linux-kernel - Re: [PATCH] i2c: omap: fix i207 errata handling

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Message-ID: <20141122210833.GB1275@katana>
Date:	Sat, 22 Nov 2014 22:08:34 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Alexander Kochetkov <al.kochet@...il.com>
Cc:	linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
	Felipe Balbi <balbi@...com>,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCH] i2c: omap: fix i207 errata handling

On Fri, Nov 21, 2014 at 04:16:51AM +0400, Alexander Kochetkov wrote:
> commit 6d9939f651419a63e091105663821f9c7d3fec37 (i2c: omap: split out [XR]DR
> and [XR]RDY) changed the way how errata i207 (I2C: RDR Flag May Be Incorrectly
> Set) get handled. 6d9939f6514 code doesn't correspond to workaround provided by
> errata.
> 
> According to errata ISR must filter out spurious RDR before data read not after.
> ISR must read RXSTAT to get number of bytes available to read. Because RDR
> could be set while there could no data in the receive FIFO.
> 
> Restored pre 6d9939f6514 way of handling errata.
> 
> Found by code review. Real impact haven't seen.
> Tested on Beagleboard XM C.
> 
> Signed-off-by: Alexander Kochetkov <al.kochet@...il.com>
> Fixes: 6d9939f651419a63e09110 i2c: omap: split out [XR]DR and [XR]RDY

Applied to for-current, thanks!


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