Date: Tue, 7 Aug 2012 17:50:20 +0100
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Matt Sealey <matt@genesi-usa.com>,
        Robert Schwebel <r.schwebel@pengutronix.de>,
        Anton Vorontsov <anton.vorontsov@linaro.org>,
        Russell King <linux@arm.linux.org.uk>,
        John Stultz <john.stultz@linaro.org>, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linaro-kernel@lists.linaro.org,
        Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH 4/9] ASoC: imx: Don't use {en,dis}able_fiq() calls
Message-ID: <20120807165019.GT16861@opensource.wolfsonmicro.com>
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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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