[alsa-devel] [PATCH] NUC900/audio: add nuc900 audio driver support

Wan ZongShun mcuos.com at gmail.com
Mon May 17 23:53:12 CEST 2010

Thanks! I will submit it again.
2010/5/17, Mark Brown <broonie at opensource.wolfsonmicro.com>:
> On Mon, May 17, 2010 at 02:26:12PM +0800, Wan ZongShun wrote:
>> >On Sun, May 16, 2010 at 11:34:01PM +0800, Wan ZongShun wrote:
>> >>+	if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
>> >>+		dev_err(nuc900_audio->dev, "AC97 codec cold reset failed!\n");
>> >What is this actually checking in the hardware?  Not all CODECs enable
>> >the AC97 link by default after a cold reset, the standard allows them to
>> >power up in a low power state which will
>> The bit 'CODEC_READY' indicates the external AC97 audio CODEC is ready,
>> I just forget to implement the warm reset operation, if need, I will do
>> it. In addition, Can I add the checking CODEC_READY operation to
>> warm reset function?
> That sounds fine.  For defensiveness it might be worth checking the
> CODEC on register reads and writes too (it'd make diagnostics a bit
> easier).
>> >>+#define	IIS_EN			0x0002
>> >Looks like there's I2S support to come?
>> Yes,nuc900 supports both IIS and AC97,but my board only enable AC97
>> support,
>> what's up here?
> Nothing, just curious.

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