lkml.org 
[lkml]   [2010]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] mfd: Improve WM831x AUXADC completion handling
On Fri, Apr 02, 2010 at 04:31:03PM +0100, Mark Brown wrote:
> Currently completion of WM831x AUXADC conversions is monitored by
> checking for convertor enable. Due to the mechanism used to ensure
> data corruption is avoided when reading AUXADC data there may under
> heavy I/O be a window where this bit has cleared but the conversion
> results have not been updated. Data availability is only guaranteed
> after the AUXADC data interrupt has been asserted.
>
> Avoid this by always using the interrupt to detect completion. If the
> chip IRQ is not set up then we poll the IRQ status register for up to
> 5ms. If it is set up then we rely on the data done interrupt with a
> vastly increased timeout, failing the conversion if the interrupt is
> not generated.
>
> This also saves a register read when using interrupts.
>
> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Applied to my for-next branch, thanks.

Cheers,
Samuel.

--
Intel Open Source Technology Centre
http://oss.intel.com/


\
 
 \ /
  Last update: 2010-04-02 18:29    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean