linux-kernel - Re: [PATCH v2] ASoC: mediatek: common: handle NULL case in suspend/resume function

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Date:   Mon, 13 Sep 2021 16:32:46 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Trevor Wu <trevor.wu@...iatek.com>
Cc:     tiwai@...e.com, matthias.bgg@...il.com,
        alsa-devel@...a-project.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dan.carpenter@...cle.com
Subject: Re: [PATCH v2] ASoC: mediatek: common: handle NULL case in
 suspend/resume function

On Mon, Sep 13, 2021 at 01:55:38PM +0800, Trevor Wu wrote:
> On Fri, 2021-09-10 at 11:23 +0100, Mark Brown wrote:

> > It seems like it'd be better to just allocate the buffer at probe
> > time
> > and fail in case we can't get it, I'd be surprised if there's many
> > platforms using this hardware that don't also end up suspending and
> > resuming.

> Thanks for your suggestion.
> I agree it's better to allocate the memory at probe time.
> I think we can still keep the implementation in the suspend/resume
> function as a fallback solution if user doesn't allocate the memory in
> probe function.

If you can't allocate it at probe time you should probably just fail the
probe.

> In the new mediatek SOCs, regcache has been used to handle register
> backup.
> Do I need to add the buffer allocation on probe function to the
> platform in which mtk_afe_suspend and mtk_afe_resume are used?

I think you should have separate implementations if you have both regmap
and non-regmap versions of this.

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