linux-kernel - Re: [PATCH] i2c: i2c-xiic: Fix big-endian register access

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Message-ID: <20141113001831.GB2062@katana>
Date:	Thu, 13 Nov 2014 01:18:31 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Thomas Gessler <Thomas.Gessler@...2.physik.uni-giessen.de>
Cc:	michal.simek@...inx.com, appana.durga.rao@...inx.com,
	khali@...ux-fr.org, sachin.kamat@...aro.org,
	paul.gortmaker@...driver.com, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: i2c-xiic: Fix big-endian register access

On Mon, Oct 13, 2014 at 06:08:47PM +0200, Thomas Gessler wrote:
> The driver tried to access device registers with the (little-endian)
> iowrite/ioread functions. While this worked on little-endian machines
> (e.g. Microblaze with AXI bus), it made the driver unusable on
> big-endian machines (e.g. PPC405 with PLB).
> 
> During the probe function, the driver tried to write a 32-bit reset mask
> into the reset register. This caused an error interrupt on big-endian
> systems, because the device detected an invalid (byte-swapped) reset
> mask. The result was an Oops.
> 
> The patch implements an endianness detection similar to the one used in
> other Xilinx drivers like drivers/spi/spi-xilinx.c. It was tested on a
> PPC405/PLB system.
> 
> Signed-off-by: Thomas Gessler <Thomas.Gessler@...2.physik.uni-giessen.de>

Applied to for-next, thanks!


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