linux-kernel - Re: [alsa-devel] [PATCH] ASoC: soc-pcm: Use delay set in pointer function

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Message-ID: <20180731131246.GC5719@sirena.org.uk>
Date:   Tue, 31 Jul 2018 14:12:46 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     "Agrawal, Akshu" <Akshu.Agrawal@....com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>, Alexander.Deucher@....com,
        djkurtz@...omium.org, Liam Girdwood <lgirdwood@...il.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH] ASoC: soc-pcm: Use delay set in pointer
 function

On Tue, Jul 31, 2018 at 12:32:59PM +0200, Takashi Iwai wrote:
> Mark Brown wrote:

> > However since it's not supposed to be providing any DMA a CPU DAI really
> > shouldn't be doing this...

> Well, if so, the CPU dai also cannot get the exact base delay
> corresponding to the reported position, either, no?

It can know how much delay it's adding internally between its input and
output, which feeds into the overall delay experienced by the user.

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