Re: [PATCH 03/16] ASoC: tas2781: disable regmap regcache

[Mark Brown <broonie@kernel.org>]

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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:

> > > And only one, because tasdevice_change_chn_book directly changes the
> > > address of i2c_client, so the unlucky one gets invalid values in its
> > > actual book from regcache_sync.

> > The code creates the impression that writing to one tas2781 writes to
> > all of them, is that not the case?

> Yes, the tasdevice_* functions, but the regcache_sync doesn't know
> this.

So this syncing is done in software not hardware?  My understanding was
that this was a hardware thing.

> > How would the devices get their configuration restored?

> tasdevice_tuning_switch calls tasdevice_select_tuningprm_cfg which
> checks whether the devices needs a new program or configuration.

> the runtime_suspend and system resume set the devices cur_prog,
> cur_conf to -1.

...

> The tas2781_hda_playback_hook calls the tasdevice_tuning_switch

And there are no registers other than these programs?

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