linux-kernel - Re: [PATCH v3] ASoC: rt286: fix headphone click/crack noise on Dell XPS 9343 I2S mode

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Date:   Wed, 22 Mar 2017 13:44:49 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Bard Liao <bardliao@...ltek.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Oder Chiou <oder_chiou@...ltek.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ASoC: rt286: fix headphone click/crack noise on Dell
 XPS 9343 I2S mode

On Tue, Mar 21, 2017 at 5:15 PM, Bard Liao <bardliao@...ltek.com> wrote:
>> -----Original Message-----
>> From: Kai-Heng Feng [mailto:kai.heng.feng@...onical.com]
>> Sent: Tuesday, March 21, 2017 1:26 PM
>> To: Mark Brown
>> Cc: Liam Girdwood; Bard Liao; Oder Chiou; alsa-devel@...a-project.org;
>> linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH v3] ASoC: rt286: fix headphone click/crack noise on Dell
>> XPS 9343 I2S mode
>> >
>> >> I had the same thought originally, but printk under each case suggests
>> >> otherwise - _POST_PMU is triggered not right after _PRE_PMU but right
>> >> before _PRE_PMD.
>> >
>> > Then you've broken something else on your system, that is obviously
>> > completely nonsensical and would break anything that relies on having a
>> > _POST_PMU event.  Why would we have two events that run at the same
>> time
>> > one of which is obviously misnamed?
>>
>> Hmm, that's weird though. I did the same test to rt286_spk_event()
>> (without applying the patch I sent), what I observed was the same:
>> _POST_PMU was triggered right after I stopped play sound, i.e. right
>> before _PRE_PMD not right after _PRE_PMU.
>>
>
> Although I don't think it will happen on my side, but I still
> ran the same test as you. The result is just as what we
> expected, _PRE_PMU and _POST_PMU run on powering
> up stage and _PRE_PMD and _POST_PMD run on powering
> down stage. Please check what's going on with your system.
>

Maybe mine is broken, maybe other XPS 9343 share the same behavior. I
guess we need more users to provide information to continue the
discussion.

>
>> ------Please consider the environment before printing this e-mail.