linux-kernel - Re: [PATCH] ALSA: hda: Skip creating captures in SOF context

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Message-ID: <CAAd53p6d846H9UKYm8CeDaYNN0qY8u0Wy9tAa3Re0bVPN8tr3w@mail.gmail.com>
Date:   Fri, 6 Jan 2023 13:00:44 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Jaroslav Kysela <perex@...ex.cz>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        tiwai@...e.com, Bard Liao <yung-chuan.liao@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda: Skip creating captures in SOF context

Hi Jaroslav,

On Thu, Jan 5, 2023 at 8:43 PM Jaroslav Kysela <perex@...ex.cz> wrote:
>
> On 05. 01. 23 13:36, Kai-Heng Feng wrote:
> > On Mon, Aug 15, 2022 at 3:55 PM Kai-Heng Feng
> > <kai.heng.feng@...onical.com> wrote:
> >>
> >> On Wed, Jul 20, 2022 at 9:31 PM Pierre-Louis Bossart
> >> <pierre-louis.bossart@...ux.intel.com> wrote:
> >>>
> >>>
> >>>
> >>> On 7/20/22 02:52, Jaroslav Kysela wrote:
> >>>> Dne 20. 07. 22 v 3:45 Kai-Heng Feng napsal(a):
> >>>>> On Tue, Jul 19, 2022 at 11:41 PM Jaroslav Kysela <perex@...ex.cz> wrote:
> >>>>>>
> >>>>>> Dne 19. 07. 22 v 16:47 Kai-Heng Feng napsal(a):
> >>>>>>> On HP laptops that use SOF driver for DMIC, the micmute LED doesn't
> >>>>>>> light up when mic is muted after commit 9b014266ef8a ("ASoC: SOF:
> >>>>>>> topology: use new sound control LED layer").
> >>>>>>>
> >>>>>>> The micmute LED itself is still working via sysfs, but it doesn't follow
> >>>>>>> mute anymore. That's because unlike vendors like Dell and Lenovo, HP
> >>>>>>> laptops use HDA codec to control mute LEDs instead of ACPI. So on HP
> >>>>>>> laptops, both SOF and HDA create captures with
> >>>>>>> SNDRV_CTL_ELEM_ACCESS_MIC_LED access, snd_ctl_led_set_state() considers
> >>>>>>> there are two different kcontrols and one of them is not muted.
> >>>>>>
> >>>>>> It does not mean that it's a wrong behavior. When both controls are muted, the
> >>>>>> LED should be turned on. It just requires that all inputs are off (and it may
> >>>>>> be the default - probably we can set in UCM or so). If you turn the "Capture
> >>>>>> Switch" off in amixer / alsamixer, do things work as expected ?
> >>>>>
> >>>>> Yes. When all captures are muted the micmute LED is on.
> >>>>>
> >>>>>>
> >>>>>>> So skip creating captures for HDA when it's called from SOF, the
> >>>>>>> captures are already handled by SOF.
> >>>>>>
> >>>>>> The capture controls are for other inputs like external analog microphone. If
> >>>>>> it is required to suppress the MIC LED for some hardware, just skip the
> >>>>>> "spec->mic_mute_led = 1" assignment in hda_generic.c . Also, the check
> >>>>>> "codec->core.type != HDA_DEV_ASOC" is not sufficient, because you don't know,
> >>>>>> if the topology really sets the MIC LED flag.
> >>>>>
> >>>>> AFAIK the external analog microphone on DMIC laptop is driven by SOF driver too.
> >>>>> If those capture controls are indeed needed for external analog mics,
> >>>>> use UCM to mute them by default won't work either.
> >>>>
> >>>> Could you describe this ? I though that only DMIC is handled by SOF when HDA
> >>>> codec is in the system. There is a separate analog codec for external analog
> >>>> microphone or the HDA codec is somehow connected to SOF/DSP ? If so, how ?
> >>>
> >>> The HDA codec is connected in the same way in all cases, there's no
> >>> hardware/electrical/routing difference.
> >>>
> >>> When used, the SOF driver will handle ALL links, be they DMIC or
> >>> HDAudio. The difference for HDaudio is that instead of a single DMA
> >>> transfer (DDR->FIFO), we have a first 'Host' DMA into the DSP SRAM, some
> >>> processing and a second 'Link' DMA from DSP SRAM to the HDaudio FIFO
> >>> (reversed flow for capture).
> >>
> >> So is this approach sufficient for this issue? Or should I explore
> >> other possibilities?
> >
> > A gentle ping...
>
> This Mic LED problem was resolved through UCM for the moment:
>
> https://github.com/alsa-project/alsa-ucm-conf/commit/79a8ec44d3dcf097f4a4492c506cbcf338324175

That solves the issue, thanks!

Kai-Heng

>
> More discussion:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=2134824
>
>                                         Jaroslav
>
> --
> Jaroslav Kysela <perex@...ex.cz>
> Linux Sound Maintainer; ALSA Project; Red Hat, Inc.