linux-kernel - Re: [RFC 15/23] usb: musb: raw read and write endian fix

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Date:	Mon, 25 Nov 2013 16:07:49 -0600
From:	Felipe Balbi <balbi@...com>
To:	Taras Kondratiuk <taras.kondratiuk@...aro.org>
CC:	<linux-omap@...r.kernel.org>, <linaro-networking@...aro.org>,
	Victor Kamensky <victor.kamensky@...aro.org>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 15/23] usb: musb: raw read and write endian fix

On Sat, Nov 16, 2013 at 02:01:18AM +0200, Taras Kondratiuk wrote:
> From: Victor Kamensky <victor.kamensky@...aro.org>
> 
> All OMAP IP blocks expect LE data, but CPU may operate in BE mode.
> Need to use endian neutral functions to read/write h/w registers.
> I.e instead of __raw_read[lw] and __raw_write[lw] functions code
> need to use read[lw]_relaxed and write[lw]_relaxed functions.
> If the first simply reads/writes register, the second will byteswap
> it if host operates in BE mode.
> 
> Changes are trivial sed like replacement of __raw_xxx functions
> with xxx_relaxed variant.
> 
> Signed-off-by: Victor Kamensky <victor.kamensky@...aro.org>
> Signed-off-by: Taras Kondratiuk <taras.kondratiuk@...aro.org>
> ---
>  drivers/usb/musb/musb_io.h |   18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_io.h b/drivers/usb/musb/musb_io.h
> index eebeed7..76f4d2a 100644
> --- a/drivers/usb/musb/musb_io.h
> +++ b/drivers/usb/musb/musb_io.h
> @@ -42,17 +42,17 @@
>  /* NOTE:  these offsets are all in bytes */
>  
>  static inline u16 musb_readw(const void __iomem *addr, unsigned offset)
> -	{ return __raw_readw(addr + offset); }
> +	{ return readw_relaxed(addr + offset); }

x86 doesn't provide any of the write?_relaxed methods so this breaks
build on x86 at least.

-- 
balbi

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