[PATCH] ASoC: rt711-sdca: remove capture switch controls

[Yang, Libin]

Hi Jaroslav,

> >>>>>>
> >>>>>>
> >>>>>> On 4/15/21 4:16 AM, shumingf at realtek.com wrote:
> >>>>>>> From: Shuming Fan <shumingf at realtek.com>
> >>>>>>>
> >>>>>>> The settings of the switch control already set by DAPM event.
> >>>>>>> These switch controls might the user confused why it can't
> >>>>>>> disable the
> >>>>>> capture.
> >>>>>>
> >>>>>> Sorry, not following. This control is used in the alsa-ucm-conf
> >>>>>> that was just merged
> >>>>>>
> >>>>>> https://github.com/alsa-project/alsa-ucm-
> >>>>>> conf/commit/197025656ec456331d1a34357b113913ec3b187f#diff-
> >>>>>>
> >>>>
> >>
> 0e1c627ea89ee148fdb41aa6b3ba7851ba9c20eb43c1b87b9e0ce92164273dc3R
> >>>>>> 7
> >>>>>>
> >>>>>> Is this saying this commit needs to be fixed with a follow-up PR?
> >>>>>> Libin, are you working on this?
> >>>>>
> >>>>> Yes, I will submit a patch for UCM after this patch is merged.
> >>>>>
> >>>>> The background is Jaroslav requires using codec HW kcontrol for
> >>>>> capture volume/switch. Shuming and I worked on it. At first we
> >>>>> wanted to use FU0F to replace PGA kcontrol. But Shuming found FU0F
> >>>>> is used in
> >>>> DAPM.
> >>>>> So it is not proper for the capture volume/switch. And Shuming
> >>>>> will remove the FU0F kcontrol.
> >>>>
> >>>> Is switch control name aligned with the volume control name after
> >>>> this change?
> >>>
> >>> This patch is removing "FU0F Capture Switch". Before this patch,
> >>> there is "FU0F Capture Switch" and "FU0F Capture Volume". After this
> >>> patch is applied, "FU0F Capture Switch" is removed. So the UCM
> >>> https://github.com/alsa-project/alsa-ucm-
> >> conf/blob/57ead84278f641d411e
> >>> 3ccbb5c8a4b64141904ba/ucm2/codecs/rt711-sdca/init.conf#L7
> >>> of "FU0F Capture Switch" setting needs to be removed.
> >>>
> >>>> I mean "A Capture Switch" + "A Capture Volume" not "A Capture
> Switch"
> >>>> + "B Capture Volume".
> >>>
> >>> We couldn't find a proper codec kcontrol for RT711 capture. So we
> >>> have to continue using PGA kcontrol.
> >>
> >> It's really confusing then. What does "FU0F Capture Volume" ? It's
> >> really difficult to judge something when I don't know the codec diagram.
> >
> > "FU0F Capture Volume" will still control the volume of rt711 capture.
> > But "FU0F Capture Switch" will be removed. Because DAPM is using this
> > the same node. These is a conflict when we do below:
> > 1. mute "FU0F Capture Switch". And the kcontrol will mute the
> >     Corresponding node in codec.
> > 2. use arecord to capture from the rt711-sdca headset 3. DAPM will
> > auto unmute the node which "FU0F Capture Switch" has
> >      muted.
> > 4. So we will capture the sound, even "FU0F Capture Switch" shows the
> >     state is "muted" (this is wrong)
> >
> > So Shuming decided to remove the "FU0F Capture Switch" kcontrol.
> 
> I see. In this case, the auto-route settings should differ from the mixer
> settings. So the mute flag should be logical _OR_ from both DAPM and the
> mixer settings. And because the codec is able to do the hw mute, why to
> prevent the export of this feature?
> 
> So I propose do do (pseudo code):
> 
> struct rt711_sdca_priv {
> 	bool fu0f_dapm_mute;
> 	bool fu0f_mixer_mute;
> };
> 
> /* called from both dapm event and kontrol put callback (on change) */
> /* the dapm event and put callback will modify only rt711_sdca_priv fields */
> static void set_f0f_mute(rt711_priv) {
> 	int mute = rt711_priv->fu0f_dapm_mute || rt711_priv-
> >fu0f_mixer_mute;
> 	set_fu0f_mute_register(mute);
> }
> 
> With this implementation, all is consistent to the user space.

If so:
When capture, if user setting is mute, it will always mute and if
user setting is unmute, it will always unmute.

When stop capture, it will always mute regardless the user setting.

Shuming, what do you think?

> 
> >> Anyway, the switch and volume for the given I/O should have identical
> >> name and they should differ only in the suffix describing the stream
> >> and functionality.
> >
> > We won't touch "CaptureSwitch" and "CaptureVolume" for rt711-sdca.
> 
> Yes, but the hw controls should be used instead DSP controls, if they are
> available.

Yes, we will try to use the codec hw controls instead of the DSP controls.

Regards,
Libin