Re: [PATCH v3 3/4] ALSA: hda/cirrus: Add jack detect interrupt support from CS42L42 companion codec.

[Vitaly Rodionov]

On 08/03/2021 3:35 pm, Pierre-Louis Bossart wrote:
> > @@ -38,6 +39,15 @@ struct cs_spec {
> >       /* for MBP SPDIF control */
> >       int (*spdif_sw_put)(struct snd_kcontrol *kcontrol,
> >                   struct snd_ctl_elem_value *ucontrol);
> > +
> > +    unsigned int cs42l42_hp_jack_in:1;
> > +    unsigned int cs42l42_mic_jack_in:1;
> > +
> > +    struct mutex cs8409_i2c_mux;
>
> what does this protect? there isn't any comment or explanations in the 
> commit message.
we are protecting sequences of i2c transactions.

for example,  when we are writing sequence to activate jack detect, as a 
result of interrupt via gpio4

unsolicited response can be called by framework at the same time. we 
want to finish first sequence.