linux-kernel - Re: [PATCH 4/9] ASoC: imx: Don't use {en,dis}able

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Date:	Tue, 7 Aug 2012 17:50:20 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Matt Sealey <matt@...esi-usa.com>,
	Robert Schwebel <r.schwebel@...gutronix.de>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 4/9] ASoC: imx: Don't use {en,dis}able_fiq() calls

On Tue, Aug 07, 2012 at 08:35:58AM +0200, Sascha Hauer wrote:

> Nowadays the FIQ support is necessary only for AC97. The AC97 support in
> the SSI unit is buggy: It does not allow you to select the slots you
> want to receive. At least the wm9712 codec always sends (apart from the
> stereo data) data in slot (I think it is) 12. You find this data mixed
> in your audio stream. The FIQ driver skips this data to get a valid
> audio stream.

Right, any device with GPIO support will do this - it's how GPIO works
in AC'97.

> One other way to solve this would be to use dma here and to filter out
> the data afterwards.

Yup.  That's probably more sane but also more work to implement.
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