RE: [PATCH v2 2/2] ASoC: rt715:add Mic Mute LED control support

["Yuan, Perry" <Perry.Yuan@dell.com>]

> -----Original Message-----
> From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
> Sent: 2021年1月13日 10:42
> To: Yuan, Perry; Limonciello, Mario; oder_chiou@realtek.com;
> perex@perex.cz; tiwai@suse.com
> Cc: alsa-devel@alsa-project.org; broonie@kernel.org; lgirdwood@gmail.com;
> linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v2 2/2] ASoC: rt715:add Mic Mute LED control support
> 
> 
> [EXTERNAL EMAIL]
> 
> 
> >>>>> +#if IS_ENABLED(CONFIG_DELL_PRIVACY)
> >>>>> +	/* Privacy LED Trigger State Changed by muted/unmute switch */
> >>>>> +	if (mc->invert) {
> >>>>> +		val0 = ucontrol->value.integer.value[0];
> >>>>> +		val1 = ucontrol->value.integer.value[1];
> >>>>> +		if (val0 == 1 && val1 == 1) {
> >>>>> +			rt715->micmute_led = LED_OFF;
> >>>>> +			ledtrig_audio_set(LED_AUDIO_MICMUTE,
> >>>>> +					rt715->micmute_led ? LED_ON :
> >>>> LED_OFF);
> >>>>> +		} else if (val0 == 0 && val1 == 0) {
> >>>>> +			rt715->micmute_led = LED_ON;
> >>>>> +			ledtrig_audio_set(LED_AUDIO_MICMUTE,
> >>>>> +					rt715->micmute_led ? LED_ON :
> >>>> LED_OFF);
> >>>>> +		}
> >>>>> +	}
> >>>>> +#endif
> >>>>
> >>>> Should this be activated for specific DMI quirks? This driver is
> >>>> used in
> >>> non-Dell
> >>>> platforms (I am thinking of Intel RVPs or Realtek daughterboards),
> >>>> I am not sure if a build-time behavior change makes sense.
> >>>>
> >>>> Or conversely could we just set the LEDs unconditionally if doing
> >>>> so is harmless?
> >>>
> >>> The current mic mute led setting path is not common used for other
> >>> vendors, just Dell platform support this mic mute led set operation.
> >>>
> >>> Do you think that I need to add one DMI quirk in the next version ?
> >>> If so, I can add that.
> >>>
> >>>
> >>
> >>
> >> In the HDA audio case this is modeled off of, the code runs whether
> >> or not a vendor has support for a mic mute LED.  The calls to
> >> ledtrig_audio_set should be a no-op.  I agree with @Pierre-Louis
> >> Bossart in this case, we should just be running it whether or not
> >> dell-privacy is compiled in.  If another vendor chooses to add LED
> >> support they'll just need to set up their ledtrig supported backend and not
> change codec code.
> >
> > Hi @Pierre-Louis Bossart
> > Seems like that we have two way to go.
> > * DMI quirks,seems like that it needs to maintain the quirk list when vendors
> have new system to support.
> > * We just set the mic mute led state unconditionally .
> >
> > Which way would you prefer for next patch review?
> 
> Maintaining quirks is a hassle, it's much simpler and consistent with HDaudio
> if the leds are set unconditionally. Thanks!

Thank you for your confirm. 
I will take this to next patch V4.

Perry  Yuan
Dell | Client Software Group | CDC Linux OS