Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 31 Jul 2018 14:51:15 +0100
From:   Mark Brown <broonie@kernel.org>
To:     Takashi Iwai <tiwai@suse.de>
Cc:     "Agrawal, Akshu" <Akshu.Agrawal@amd.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@alsa-project.org>, Alexander.Deucher@amd.com,
        djkurtz@chromium.org, Liam Girdwood <lgirdwood@gmail.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [alsa-devel] [PATCH] ASoC: soc-pcm: Use delay set in pointer
 function
Message-ID: <20180731135115.GD5719@sirena.org.uk>
References: <s5hy3dsviwq.wl-tiwai@suse.de>
 <20180730155030.GP5789@sirena.org.uk>
 <7a88c7b4-d31d-b044-bb8e-a866d49d1256@amd.com>
 <s5hwotc0y6v.wl-tiwai@suse.de>
 <5b3249cb-6212-6a14-b644-7548cf0ad00c@amd.com>
 <s5ha7q721vs.wl-tiwai@suse.de>
 <20180731101943.GB5719@sirena.org.uk>
 <s5heffjr8ys.wl-tiwai@suse.de>
 <20180731131246.GC5719@sirena.org.uk>
 <s5hin4vpm80.wl-tiwai@suse.de>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
        protocol="application/pgp-signature"; boundary="sgneBHv3152wZ8jf"
Content-Disposition: inline
In-Reply-To: <s5hin4vpm80.wl-tiwai@suse.de>
User-Agent: Mutt/1.10.0 (2018-05-17)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


--sgneBHv3152wZ8jf
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

On Tue, Jul 31, 2018 at 03:29:35PM +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.

> But isn't it merely the additional delay that should be applied on top
> of the existing runtime->delay?

Yes.  I'm saying that if the CPU DAI thinks it can figure out the base
delay something is confused.

--sgneBHv3152wZ8jf
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAltgaVIACgkQJNaLcl1U
h9Dc/gf8DM00LYsmfSfREWDEZOQ1LLvo4bi8nuYkoSUTGC/fkCvSgUj732kSvkAY
aPaZqrlhMZf+aedlU2+8TCRu/MMUszefetX6N8/gYBAmHWS2Bo2mEnljNZD+zrP/
oisktLeeIK0W5HX7Rafoij3KM79QqD2VZusExUGH+GIVKuj6bWmIx2kBjULSsuft
XCJWmWiYx9KlM2WQR0djpW+5NPKbymLVmcYgPRcR21reY8umeG2z9noMrtIcaNYy
mdH7ioFzJ5aqdgK90AMoFgj+apDhcdhC8D8gkxQhV6EmiwxrelanrTSnQ7N6EtMh
LcM8hvc1692eypMzlAYeCRBrEbF+OQ==
=baWl
-----END PGP SIGNATURE-----

--sgneBHv3152wZ8jf--