[alsa-devel] [RFC PATCH] ASoC: wm_adsp: Change ADSPs to be mixer widgets rather the PGAs
broonie at kernel.org
Wed Dec 18 14:23:43 CET 2013
On Wed, Dec 18, 2013 at 01:14:36PM +0000, Charles Keepax wrote:
> On Wed, Dec 18, 2013 at 11:27:39AM +0000, Mark Brown wrote:
> > One of the issues here was trying to ensure that the DSP started up with
> > its inputs stable so noise from them starting didn't propagage into the
> > algorithm and confuse it. The expecation with putting it as a PGA was
> > that it would start with the outputs mute and do a digital unmute to
> > bring them up. Since everything is digital this should all be more
> > robust than it would be for analogue.
> Muting the output is a little tricky though as a graph walk will
> be required to determine which output was connected, unless you
> have any handy ideas I have not spotted? I will start having a
> look to see what could be done on the muting front.
Not the physical output, the DSP output into the rest of the device. It
would be very surprising if it powered up making noise.
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