On Thu, 25 Mar 2021 13:12:48 +0100, Kai-Heng Feng wrote: > > Rear Mic on Lenovo P620 cannot record after S3, despite that there's no > error and the other two functions of the USB audio, Line In and Line > Out, work just fine. > > The mic starts to work again after running userspace app like "alsactl > store". Following the lead, the evidence shows that as soon as connector > status is queried, the mic can work again. > > So also check connector value on resume to "wake up" the USB audio to > make it functional. > > This can be device specific, however I think this generic approach may > benefit more than one device. > > While at it, also remove reset-resume path to consolidate mixer resume > path. > > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> > --- > v2: > - Remove reset-resume. > - Fold the connector checking to the mixer resume callback. That's not what I meant exactly... I meant to put both into the single resume callback, but handle each part conditionally depending on reset_resume argument. But this turned out to need more changes in mixer_quirks.c unnecessarily. Maybe adding the two resume functions is a better approach in the end, but not for the specific connection thing but generically both resume and reset_resume callbacks. Something like below. thanks, Takashi diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index b004b2e63a5d..1dab281bb269 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -3615,20 +3615,43 @@ static int restore_mixer_value(struct usb_mixer_elem_list *list) return 0; } +static int default_mixer_resume(struct usb_mixer_elem_list *list) +{ + struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list); + + /* get connector value to "wake up" the USB audio */ + if (cval->val_type == USB_MIXER_BOOLEAN && cval->channels == 1) + get_connector_value(cval, NULL, NULL); + + return 0; +} + +static int default_mixer_reset_resume(struct usb_mixer_elem_list *list) +{ + int err = default_mixer_resume(list); + + if (err < 0) + return err; + return restore_mixer_value(list); +} + int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume) { struct usb_mixer_elem_list *list; + usb_mixer_elem_resume_func_t f; int id, err; - if (reset_resume) { - /* restore cached mixer values */ - for (id = 0; id < MAX_ID_ELEMS; id++) { - for_each_mixer_elem(list, mixer, id) { - if (list->resume) { - err = list->resume(list); - if (err < 0) - return err; - } + /* restore cached mixer values */ + for (id = 0; id < MAX_ID_ELEMS; id++) { + for_each_mixer_elem(list, mixer, id) { + if (reset_resume) + f = list->reset_resume; + else + f = list->resume; + if (f) { + err = list->resume(list); + if (err < 0) + return err; } } } @@ -3647,6 +3670,7 @@ void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list, list->id = unitid; list->dump = snd_usb_mixer_dump_cval; #ifdef CONFIG_PM - list->resume = restore_mixer_value; + list->resume = default_mixer_resume; + list->reset_resume = default_mixer_reset_resume; #endif } diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h index c29e27ac43a7..e5a01f17bf3c 100644 --- a/sound/usb/mixer.h +++ b/sound/usb/mixer.h @@ -69,6 +69,7 @@ struct usb_mixer_elem_list { bool is_std_info; usb_mixer_elem_dump_func_t dump; usb_mixer_elem_resume_func_t resume; + usb_mixer_elem_resume_func_t reset_resume; }; /* iterate over mixer element list of the given unit id */ diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c index ffd922327ae4..b7f9c2fded05 100644 --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -151,7 +151,7 @@ static int add_single_ctl_with_resume(struct usb_mixer_interface *mixer, *listp = list; list->mixer = mixer; list->id = id; - list->resume = resume; + list->reset_resume = resume; kctl = snd_ctl_new1(knew, list); if (!kctl) { kfree(list);