[alsa-devel] [PATCH 8/8] ASoC: Ux500: Add machine-driver

Mark Brown broonie at opensource.wolfsonmicro.com
Fri Apr 27 13:15:23 CEST 2012

On Fri, Apr 27, 2012 at 12:59:06PM +0200, Ola Lilja wrote:

> We will add more codecs to be matched up the same machine-driver and I found it
> useful to have this split. It just separates the callbacks related to each codec
> added in the dai-link-struct. I would like to keep this division if that is OK.

No, I really don't see any value at all in it.  The machine drivers
aren't actually sharing anything visible and the effect of what you're
doing is to make the selection of machine a compile time one instead of
a runtime one.

> >> +	/* Setup codec depending on driver-mode */
> >> +	driver_mode = (channels == 8) ?
> >> +	dev_dbg(dev, "%s: Driver-mode: %s.\n", __func__,
> >> +		(driver_mode == DRIVERMODE_NORMAL) ? "NORMAL" : "CODEC_ONLY");
> >> +
> >> +	ab8500_audio_set_bit_delay(codec_dai, 1);

> > What's this configuring?  I didn't notice it on the CODEC driver as the
> > function wasn't exported IIRC.

> The bit delay is the number of bit-clocks from the framesync to the first data-bit.
> For the AB8500-chip it is set by the bit AB8500_DIGIFCONF2_IF0DEL.
> I would have put this in the set_dai_fmt but I have not found a bit that is
> controlling this.

But what are you actually tying to do with this?  It sounds rather like
you're selecting between DSP A and B modes...
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