linux-kernel - Re: [PATCH v2 2/7] ASoC: fsl_rpmsg: Add CPU DAI driver for audio base on rpmsg

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Message-ID: <CAA+D8AN=SDMLhuNbstzHL_H2p_L6cr+oCXbauNB0gGs2BW5tmA@mail.gmail.com>
Date:   Wed, 10 Feb 2021 14:35:29 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, alsa-devel@...a-project.org,
        Timur Tabi <timur@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Xiubo Li <Xiubo.Lee@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH v2 2/7] ASoC: fsl_rpmsg: Add CPU DAI driver for audio base
 on rpmsg

On Wed, Feb 10, 2021 at 6:30 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Tue, Feb 09, 2021 at 05:16:16PM +0800, Shengjiu Wang wrote:
> > On Mon, Feb 8, 2021 at 7:53 PM Mark Brown <broonie@...nel.org> wrote:
>
> > > hw_params() can be called multiple times and there's no need for it to
> > > be balanced with hw_free(), I'd move this to a different callback (DAPM
> > > should work well).
>
> > Which callback should I use? Is there an example?
>
> Like I say I'd actually recommend moving this control to DAPM.

I may understand your point, you suggest to use the .set_bias_level
interface. But in my case I need to enable the clock in earlier stage
and keep the clock on when system go to suspend.

I am not sure .set_bias_level can met my requirement. we start
the Chinese new year holiday now, so currently I can't do test for this
recommendation.

Maybe we can keep current implementation, can we?
Later after I do the test, I can submit another patch for it.

Best regards
Wang Shengjiu