linux-kernel - Re: [PATCH] ASoC: max98390: Remove unnecessary amp on/off conrtol

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Date:   Thu, 1 Sep 2022 14:57:19 +0900
From:   Lee Steve <steve.lee.analog@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        krzk@...nel.org, ryans.lee@...log.com
Subject: Re: [PATCH] ASoC: max98390: Remove unnecessary amp on/off conrtol

On Thu, Sep 1, 2022 at 1:36 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Fri, Aug 26, 2022 at 11:35:04AM +0900, Steve Lee wrote:
>
> >  The Amp is already control in userspace before trigger calibrate function.
> > Remove unnecessary control in calibrate function.
>
> I can't see anything which ensures that this is the case?  Should there
> be a check which returns an error if the output is not enabled, or
> should the function check the current state and preserve it at the end?
> I can see that this would fix problems with it being disabled when
> callibrating.

 As your comment, this can fix amp being disabled when calibrating.
And this also fix the case that music play right after calibration.
Actually, calibration process should start mute playback before
trigger this function.
AMP disable/enable control in calibration function can break sync with
userspace enable/disable control.