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Message-ID: <f135963cb14d9bef6cddbe0bd1ce0aaa6d4ac7d9.camel@irl.hu>
Subject: Re: [PATCH 03/16] ASoC: tas2781: disable regmap regcache
From: Gergo Koteles <soyer@irl.hu>
To: Mark Brown <broonie@kernel.org>
Cc: Shenghao Ding <shenghao-ding@ti.com>, Kevin Lu <kevin-lu@ti.com>,
  Baojun Xu <baojun.xu@ti.com>, Jaroslav Kysela <perex@perex.cz>,
  Takashi Iwai <tiwai@suse.com>, Liam Girdwood <lgirdwood@gmail.com>,
  linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org
Date: Fri, 15 Dec 2023 15:42:43 +0100
In-Reply-To: <5b2eb7eb-761e-406d-8d55-b7ea8cddefa8@sirena.org.uk>
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	 <0b836c10-b21b-4275-8dd0-254dd5467497@sirena.org.uk>
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On Fri, 2023-12-15 at 12:55 +0000, Mark Brown wrote:
> On Fri, Dec 15, 2023 at 02:17:01AM +0100, Gergo Koteles wrote:
> > On Thu, 2023-12-07 at 22:39 +0000, Mark Brown wrote:
> > > On Thu, Dec 07, 2023 at 10:12:13PM +0100, Gergo Koteles wrote:
> > > > On Thu, 2023-12-07 at 20:36 +0000, Mark Brown wrote:
>=20
> > > > > The code creates the impression that writing to one tas2781 write=
s to
> > > > > all of them, is that not the case?
>=20
> > > > Yes, the tasdevice_* functions, but the regcache_sync doesn't know
> > > > this.
>=20
> > > So this syncing is done in software not hardware?  My understanding w=
as
> > > that this was a hardware thing.
>=20
> > If you mean that the amplifier does not know that there are several
> > programs or configurations or profiles, but only runs the current one,
> > yes.
>=20
> No, I mean that the amplifiers don't talk to each other at a hardware
> level and the grouping is all in software.

No, they don't talk to each other. But they have a global i2c address
to speed up configuration, but the module doesn't use it yet.