On Fri, 12 May 2023 14:00:54 +0200, Amadeusz Sławiński wrote: > > On 5/12/2023 1:33 PM, Takashi Iwai wrote: > > On Fri, 12 May 2023 13:23:49 +0200, > > Takashi Iwai wrote: > >> > >> On Thu, 11 May 2023 19:20:17 +0200, > >> Amadeusz Sławiński wrote: > >>> > >>> On 5/11/2023 5:58 PM, Takashi Iwai wrote: > >>>> On Thu, 11 May 2023 17:31:37 +0200, > >>>> Amadeusz Sławiński wrote: > >>>>> > >>>>> On 5/10/2023 2:21 PM, Takashi Iwai wrote: > >>>>>> On Tue, 09 May 2023 12:10:06 +0200, > >>>>>> Amadeusz Sławiński wrote: > >>>>> Then capture stream starts and seems to assume that > >>>>> registers were already set, so it doesn't write them to hw. > >>>> > >>>> ... it seems this didn't happen, and that's the inconsistency. > >>>> > >>>> So the further question is: > >>>> At the point just before you start recording, is the codec in runtime > >>>> suspended? Or it's running? > >>>> > >>>> If it's runtime-suspended, snd_hda_regmap_sync() must be called from > >>>> alc269_resume() via runtime-resume, and this must write out the > >>>> cached values. Then the bug can be along with that line. > >>>> > >>>> Or if it's running, it means that the previous check of > >>>> snd_hdac_keep_power_up() was bogus (or racy). > >>>> > >>> > >>> Well, it is in... let's call it semi powered state. When snd_hda_intel > >>> driver is loaded with power_save=X option it sets timeout to X seconds > >>> and problem only happens when I start the stream before those X > >>> seconds pass and it runs first runtime suspend. After it suspends it > >>> then uses standard pm_runtime_resume and works correctly. That's why > >>> the pm_runtime_force_suspend(&codec->core.dev); mentioned in first > >>> email in thread "fixes" the problem, as it forces it to be instantly > >>> suspended instead of waiting for timeout and then later normal > >>> resume-play/record-suspend flow can be followed. > >> > >> Hm, then maybe it's a bad idea to rely on the usage count there. > >> Even if the usage is 0, the device can be still active, and the update > >> can be missed. > >> > >> How about the patch like below? > > > > Scratch that, it returns a wrong value. > > A simpler version like below works instead? > > > > Yes it was broken, arecord didn't even start capturing ;) > > > > > Takashi > > > > --- a/sound/hda/hdac_device.c > > +++ b/sound/hda/hdac_device.c > > @@ -611,10 +611,9 @@ EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm); > > int snd_hdac_keep_power_up(struct hdac_device *codec) > > { > > if (!atomic_inc_not_zero(&codec->in_pm)) { > > - int ret = pm_runtime_get_if_in_use(&codec->dev); > > - if (!ret) > > + if (!pm_runtime_active(&codec->dev)) > > return -1; > > - if (ret < 0) > > + if (pm_runtime_get_sync(&codec->dev) < 0) > > return 0; > > } > > return 1; > > > This one seems to work, as in I'm able to record before first suspend > hits. However device stays in D0 when no stream is running... > # cat /sys/devices/pci0000\:00/0000\:00\:0e.0/power_state > D0 OK, one step forward. The previous change was bad in anyway, as we shouldn't sync there at all. So, the problem becomes clearer now: it's in the lazy update mechanism that misses the case that has to be written. Scratch the previous one again, and could you try the following one instead? Takashi --- a/sound/hda/hdac_regmap.c +++ b/sound/hda/hdac_regmap.c @@ -293,8 +293,17 @@ static int hda_reg_write(void *context, unsigned int reg, unsigned int val) if (verb != AC_VERB_SET_POWER_STATE) { pm_lock = codec_pm_lock(codec); - if (pm_lock < 0) - return codec->lazy_cache ? 0 : -EAGAIN; + if (pm_lock < 0) { + /* skip the actual write if it's in lazy-update mode + * and only if the device is actually suspended; + * the usage count can be zero at transition phase + * (either suspending/resuming or auto-suspend sleep) + */ + if (codec->lazy_cache && + pm_runtime_suspended(&codec->dev)) + return 0; + return -EAGAIN; + } } if (is_stereo_amp_verb(reg)) {