linux-kernel - Re: [PATCH] ASoC: q6apm-dai: schedule all the periods before we start streaming

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Message-ID: <4678ae0d-434e-4e04-bd77-abae1969ff6c@sirena.org.uk>
Date: Mon, 3 Feb 2025 15:07:22 +0000
From: Mark Brown <broonie@...nel.org>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
	krzysztof.kozlowski@...aro.org, pierre-louis.bossart@...ux.dev,
	linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmitry.baryshkov@...aro.org
Subject: Re: [PATCH] ASoC: q6apm-dai: schedule all the periods before we
 start streaming

On Mon, Feb 03, 2025 at 02:30:26PM +0000, Srinivas Kandagatla wrote:
> On 03/02/2025 14:17, Mark Brown wrote:
> > On Mon, Feb 03, 2025 at 12:49:45PM +0000, srinivas.kandagatla@...aro.org wrote:

> > > Fix this by scheduling all the periods, this will ensure that the dsp
> > > has enough buffer feed and ultimatley fixing the underruns and audio
> > > distortion.

> > Should we be writing all periods or just the minimum number of periods
> > that's configured?  Userspace might not have filled the whole buffer
> > yet.

> Just minimum number of periods or 1 period. We are queuing up all the
> periods to the DSP, so that we do not have to wait for period interrupt to
> queue the next one. This significantly reduces the latency in queuing the
> periods to dsp.

What guarantee do you have that the data isn't garbage?

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