[PATCH] ASoC: rt5682: remove jack detect delay

[PATCH] ASoC: rt5682: remove jack detect delay

[Curtis Malainey]

There is a 250ms delay on the jack detect interrupt currently, this
delay is observable to users who are using inline controls. It can also
mask multiple presses which is a negative experience.

Cc: Bard liao <yung-chuan.liao@linux.intel.com>
Cc: Shuming Fan <shumingf@realtek.com>

Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
---
 sound/soc/codecs/rt5682-i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt5682-i2c.c b/sound/soc/codecs/rt5682-i2c.c
index 93c1603b42f1..b15c3e7d1f59 100644
--- a/sound/soc/codecs/rt5682-i2c.c
+++ b/sound/soc/codecs/rt5682-i2c.c
@@ -78,7 +78,7 @@ static irqreturn_t rt5682_irq(int irq, void *data)
 	struct rt5682_priv *rt5682 = data;
 
 	mod_delayed_work(system_power_efficient_wq,
-		&rt5682->jack_detect_work, msecs_to_jiffies(250));
+		&rt5682->jack_detect_work, 0);
 
 	return IRQ_HANDLED;
 }
-- 
2.30.0.478.g8a0d178c01-goog

Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Curtis Malainey]

Hello Realtek
+Arava, Jairaj <jairaj.arava@intel.com>

On Wed, Feb 17, 2021 at 1:49 PM Curtis Malainey <cujomalainey@chromium.org>
wrote:

> There is a 250ms delay on the jack detect interrupt currently, this
> delay is observable to users who are using inline controls. It can also
> mask multiple presses which is a negative experience.
>
> Cc: Bard liao <yung-chuan.liao@linux.intel.com>
> Cc: Shuming Fan <shumingf@realtek.com>
>
> Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
> ---
>  sound/soc/codecs/rt5682-i2c.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/soc/codecs/rt5682-i2c.c b/sound/soc/codecs/rt5682-i2c.c
> index 93c1603b42f1..b15c3e7d1f59 100644
> --- a/sound/soc/codecs/rt5682-i2c.c
> +++ b/sound/soc/codecs/rt5682-i2c.c
> @@ -78,7 +78,7 @@ static irqreturn_t rt5682_irq(int irq, void *data)
>         struct rt5682_priv *rt5682 = data;
>
>         mod_delayed_work(system_power_efficient_wq,
> -               &rt5682->jack_detect_work, msecs_to_jiffies(250));
> +               &rt5682->jack_detect_work, 0);
>
>
This change is posted to start a discussion as to the purpose of this
delay, we are seeing noticeable UI delay and button masking. Is there an
electro/mechanical purpose to it? If not I think I should post a V2 to
remove the workqueue since this is a threaded irq. Please advise, thanks.


>         return IRQ_HANDLED;
>  }
> --
> 2.30.0.478.g8a0d178c01-goog
>
>

Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Takashi Iwai]

On Thu, 18 Feb 2021 09:38:53 +0100,
Shuming [范書銘] <shumingf@realtek.com> wrote:
> 
> > There is a 250ms delay on the jack detect interrupt currently, this delay is
> > observable to users who are using inline controls. It can also mask multiple
> > presses which is a negative experience.
> > 
> > Cc: Bard liao <yung-chuan.liao@linux.intel.com>
> > Cc: Shuming Fan <shumingf@realtek.com>
> > 
> > Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
> > ---
> >  sound/soc/codecs/rt5682-i2c.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/sound/soc/codecs/rt5682-i2c.c b/sound/soc/codecs/rt5682-i2c.c
> > index 93c1603b42f1..b15c3e7d1f59 100644
> > --- a/sound/soc/codecs/rt5682-i2c.c
> > +++ b/sound/soc/codecs/rt5682-i2c.c
> > @@ -78,7 +78,7 @@ static irqreturn_t rt5682_irq(int irq, void *data)
> >  	struct rt5682_priv *rt5682 = data;
> > 
> >  	mod_delayed_work(system_power_efficient_wq,
> > -		&rt5682->jack_detect_work, msecs_to_jiffies(250));
> > +		&rt5682->jack_detect_work, 0);
> 
> How about using the device property to adjust the delay time?
> I think it should keep the workqueue to do the jack/button detection because the jack type detection will take some times to do.

One might check twice (or more) if it's not certain, too.  That is,
check the jack immediately, and if the jack state really changed,
report it so.  OTOH, if the jack state doesn't change from the old
state, it can retry after some delay.


thanks,

Takashi

Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Curtis Malainey]

Thanks Takashi and Shuming


On Thu, Feb 18, 2021 at 12:44 AM Takashi Iwai <tiwai@suse.de> wrote:

> On Thu, 18 Feb 2021 09:38:53 +0100,
> Shuming [范書銘] <shumingf@realtek.com> wrote:
> >
> > > There is a 250ms delay on the jack detect interrupt currently, this
> delay is
> > > observable to users who are using inline controls. It can also mask
> multiple
> > > presses which is a negative experience.
> > >
> > > Cc: Bard liao <yung-chuan.liao@linux.intel.com>
> > > Cc: Shuming Fan <shumingf@realtek.com>
> > >
> > > Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
> > > ---
> > >  sound/soc/codecs/rt5682-i2c.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/sound/soc/codecs/rt5682-i2c.c
> b/sound/soc/codecs/rt5682-i2c.c
> > > index 93c1603b42f1..b15c3e7d1f59 100644
> > > --- a/sound/soc/codecs/rt5682-i2c.c
> > > +++ b/sound/soc/codecs/rt5682-i2c.c
> > > @@ -78,7 +78,7 @@ static irqreturn_t rt5682_irq(int irq, void *data)
> > >     struct rt5682_priv *rt5682 = data;
> > >
> > >     mod_delayed_work(system_power_efficient_wq,
> > > -           &rt5682->jack_detect_work, msecs_to_jiffies(250));
> > > +           &rt5682->jack_detect_work, 0);
> >
> > How about using the device property to adjust the delay time?
> > I think it should keep the workqueue to do the jack/button detection
> because the jack type detection will take some times to do.
>

I am trying to understand the purpose of this delay currently, won't
the press already be registered since we have an interrupt? Or does it need
to stabilize? The reason is 250ms is well within human perception or even
double tap time, which results in users possibly double tapping buttons but
only seeing one press come through.


>
> One might check twice (or more) if it's not certain, too.  That is,
> check the jack immediately, and if the jack state really changed,
> report it so.  OTOH, if the jack state doesn't change from the old
> state, it can retry after some delay.
>

I feel like this logic would cause more problems with fast presses unless
the window was restricted down to sub 50ms.


>
>
> thanks,
>
> Takashi
>

Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Mark Brown]

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On Thu, Feb 18, 2021 at 01:06:27PM -0800, Curtis Malainey wrote:

> I am trying to understand the purpose of this delay currently, won't
> the press already be registered since we have an interrupt? Or does it need
> to stabilize? The reason is 250ms is well within human perception or even
> double tap time, which results in users possibly double tapping buttons but
> only seeing one press come through.

It's quite common to have lots of issues with debounce on jacks,
especially around insert/removal - it looks like this delay covers both
insert/removal and button presses so it may well be needed for robust
handling of the actual jack insert.

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Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Curtis Malainey]

On Mon, Feb 22, 2021 at 5:46 AM Mark Brown <broonie@kernel.org> wrote:

> On Thu, Feb 18, 2021 at 01:06:27PM -0800, Curtis Malainey wrote:
>
> > I am trying to understand the purpose of this delay currently, won't
> > the press already be registered since we have an interrupt? Or does it
> need
> > to stabilize? The reason is 250ms is well within human perception or even
> > double tap time, which results in users possibly double tapping buttons
> but
> > only seeing one press come through.
>

Would a acceptable solution to everyone be

if inserted && buttonAction
  respond now
else
  run workqueue


>
> It's quite common to have lots of issues with debounce on jacks,
> especially around insert/removal - it looks like this delay covers both
> insert/removal and button presses so it may well be needed for robust
> handling of the actual jack insert.
>

Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Mark Brown]

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On Mon, Feb 22, 2021 at 10:59:34AM -0800, Curtis Malainey wrote:

> if inserted && buttonAction
>   respond now
> else
>   run workqueue

Are you sure that *zero* debounce is needed for the button presses?
250ms does look like a lot of time but zero might be going from one
extreme to the other.

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Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Curtis Malainey]

>
> Are you sure that *zero* debounce is needed for the button presses?
> 250ms does look like a lot of time but zero might be going from one
> extreme to the other.


Fair point, I was looking at some other codecs and why they respond so
quickly, it appears they have no fixed delay and just call schedule
work. That being said, I can easily double tap <100ms. So Ideally i
would like to keep this on the order of ~50ms at most. I am guessing
Realtek will want to keep the 250ms for jack detect still.

Would queueing two separate jobs with two different delays be the
simple way to go? Realtek does this sound fine to you?

Curtis

Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Mark Brown]

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On Tue, Feb 23, 2021 at 10:50:18AM -0800, Curtis Malainey wrote:

> > Are you sure that *zero* debounce is needed for the button presses?
> > 250ms does look like a lot of time but zero might be going from one
> > extreme to the other.

> Fair point, I was looking at some other codecs and why they respond so
> quickly, it appears they have no fixed delay and just call schedule
> work. That being said, I can easily double tap <100ms. So Ideally i
> would like to keep this on the order of ~50ms at most. I am guessing
> Realtek will want to keep the 250ms for jack detect still.

Those feel like plausible numbers to me assuming there's no hardware
debounce.

> Would queueing two separate jobs with two different delays be the
> simple way to go? Realtek does this sound fine to you?

Possibly just queuing the same job with different timeouts?  I don't
have particularly strong feelings assuming the resulting code make
sense.

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Re: [PATCH] ASoC: rt5682: remove jack detect delay

[Curtis Malainey]

>
> > Would queueing two separate jobs with two different delays be the
> > simple way to go? Realtek does this sound fine to you?
>
> Possibly just queuing the same job with different timeouts?  I don't
> have particularly strong feelings assuming the resulting code make
> sense.

And just track how we were last scheduled so we only check the correct
thing? Sure that works too.