linux-kernel - Re: [PATCH v3 1/2] ALSA: hda/realtek: Add COEF controlled micmute LED support

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Date:   Thu, 18 Jun 2020 13:00:13 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     tiwai@...e.com, Jaroslav Kysela <perex@...ex.cz>,
        Wenwen Wang <wenwen@...uga.edu>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Michał Mirosław 
        <mirq-linux@...e.qmqm.pl>, Hui Wang <hui.wang@...onical.com>,
        Kailang Yang <kailang@...ltek.com>,
        Jian-Hong Pan <jian-hong@...lessm.com>,
        Tomas Espeleta <tomas.espeleta@...il.com>,
        Thomas Hebb <tommyhebb@...il.com>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] ALSA: hda/realtek: Add COEF controlled micmute LED support

On Thu, 18 Jun 2020 12:16:15 +0200,
Kai-Heng Feng wrote:
> 
> 
> 
> > On Jun 18, 2020, at 15:32, Takashi Iwai <tiwai@...e.de> wrote:
> > 
> > On Thu, 18 Jun 2020 07:15:21 +0200,
> > Kai-Heng Feng wrote:
> >> 
> >> 
> >> 
> >>> On Jun 17, 2020, at 23:50, Takashi Iwai <tiwai@...e.de> wrote:
> >>> 
> >>> On Wed, 17 Jun 2020 17:24:30 +0200,
> >>> Kai-Heng Feng wrote:
> >>>> 
> >>>> 
> >>>> 
> >>>>> On Jun 17, 2020, at 19:55, Takashi Iwai <tiwai@...e.de> wrote:
> >>>>> 
> >>>>> On Wed, 17 Jun 2020 12:29:01 +0200,
> >>>>> Kai-Heng Feng wrote:
> >>>>>> 
> >>>>>> Currently, HDA codec LED class can only be used by GPIO controlled LED.
> >>>>>> However, there are some new systems that control LED via COEF instead of
> >>>>>> GPIO.
> >>>>>> 
> >>>>>> In order to support those systems, create a new helper that can be
> >>>>>> facilitated by both COEF controlled and GPIO controlled LED.
> >>>>>> 
> >>>>>> In addition to that, add LED_CORE_SUSPENDRESUME flag since some systems
> >>>>>> don't restore the LED properly after suspend.
> >>>>>> 
> >>>>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> >>>>> 
> >>>>> Thanks for the quick follow up, the issues I pointed were fixed.
> >>>>> 
> >>>>> But, now looking at the code change again, I'm no longer sure whether
> >>>>> it's the right move.
> >>>>> 
> >>>>> Basically, the led cdev should serve only for turning on/off the LED
> >>>>> as given.  But your patch changes it to call the generic mixer
> >>>>> updater, which is rather the one who would call the led cdev state
> >>>>> update itself.  That is, it's other way round.
> >>>>> 
> >>>>> IMO, what we need is to make all places calling
> >>>>> snd_hda_gen_add_micmute_led() to create led cdev, and change those
> >>>>> calls with snd_hda_gen_fixup_micmute_led().
> >>>> 
> >>>> Ok, so it's the same as patch v1.
> >>>> How should we handle vendors other than HP?
> >>>> Only create led cdev if the ID matches to HP?
> >>> 
> >>> It's fine to create a LED classdev for other vendors, too.  But the
> >>> problem is that it wasn't consistent.  With the LED classdev, we
> >>> should use only cdev, instead of mixing up different ways.
> >> 
> >> Ok, now I get what you meant...
> >> 
> >>> 
> >>> I wrote a few patches to convert those mic-mute LED stuff to classdev,
> >>> including some cleanups.  The patches are found in
> >>> topic/hda-micmute-led branch of sound git tree.  Could you check it?
> >>> 
> >>> Note that it's totally untested.  Also it doesn't contain yet
> >>> LED_CORE_SUSPENDRESUME, which should be done in another patch in
> >>> anyway.
> >> 
> >> Other than LED_CORE_SUSPENDRESUME, it works great!
> >> 
> >> Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > 
> > Good to hear!
> > 
> >>>>> It'll be a bit more changes and likely not fitting with 5.8, but the
> >>>>> whole result will be more consistent.
> >>>> 
> >>>> A bit off topic, but do you think it's reasonable to also create led cdev for mute LED, in addition to micmute LED?
> >>>> I just found that the LEDs are still on during system suspend, and led cdev has the ability to turn off the LEDs on system suspend.
> >>> 
> >>> Yes, it makes sense, too.  But the playback mute handling is a bit
> >>> more complicated than the mic-mute LED because it's implemented with a
> >>> vmaster hook.  I'll take a look later.
> >> 
> >> Thanks. I'll be happy to test it.
> > 
> > OK, I worked on this further and converted the whole mute LED handling
> > with LED classdev.
> > 
> > The topic/hda-micmute-led branch was updated again.  Could you give it
> > a try?  If that's OK, I'll add your tested-by tag and submit the
> > patches to ML later.
> 
> Thanks for the work, it works great.
> 
> Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Great, then I'll submit a patch set.
Thanks for quick testing!


Takashi