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

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Message-Id: <50F84AE3-CA74-4231-86F2-30D7C7920B4D@canonical.com>
Date:   Thu, 18 Jun 2020 18:16:15 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Takashi Iwai <tiwai@...e.de>
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 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>

> 
> The old patchset is saved in topic/hda-micmute-led-old branch just for
> a reference.
> 
> 
> thanks,
> 
> Takashi