Is my guess on this question correct? I am afraid that this parameter will have other effects ------------------ 原始邮件 ------------------ 发件人: "Takashi Iwai" <tiwai@xxxxxxx>; 发送时间: 2021年11月23日(星期二) 下午4:25 收件人: "单曲循环"<tianyucode@xxxxxxxxxxx>; 抄送: "perex"<perex@xxxxxxxx>;"tiwai"<tiwai@xxxxxxxx>;"alsa-devel"<alsa-devel@xxxxxxxxxxxxxxxx>;"tianyu"<tianyu@xxxxxxxxxx>; 主题: Re: [PATCH] ALSA: hda/via - fix occasionally no sound with VT1802 On Tue, 23 Nov 2021 09:07:14 +0100, tianyucode wrote: > > From: tianyu <tianyu@xxxxxxxxxx> > > Hi guys, I'm a new guy for audio driver. > > I have encountered a problem. When using the VT1802 codec, > there will be no sound occasionally. After checking the initialization process, > I found that the cause of the problem is that the power state does not have > hda_set_power_state(codec, AC_PWRST_D0). > > 1. The power state is set to AC_PWRST_D0 during the first initialization: > > azx_probe_continue > azx_probe_codecs > snd_hda_codec_new > snd_hda_codec_device_new > hda_set_power_state(codec, AC_PWRST_D0); > > 2. Then, the power state is set to AC_PWRST_D3 in VT1802, but not set in realtek (ALC269). > > azx_probe_continue > azx_codec_configure > … > patch_vt2002 > via_parse_auto_config > snd_hda_gen_parse_auto_config > add_all_pin_power_ctls > add_pin_power_ctls > set_path_power > > static void add_all_pin_power_ctls(struct hda_codec *codec, bool on) > { > /**/ > if (!codec->power_save_node) > return; > > add_pin_power_ctls(codec, cfg->line_outs, cfg->line_out_pins, on); > /**/ > } > > The power_save_node is set to 0 in patch_alc269 and it returns here, > but it is set to 1 in VT1802. > > patch_vt2002P > via_new_spec > codec->power_save_node = 1; > via_parse_auto_config > snd_hda_gen_parse_auto_config > codec->power_save_node = 0;//it set to 0 here,but add_all_pin_power_ctls has been done > > patch_alc269 > codec->power_save_node = 0; > > 3. Next there is a suspend and resume process, the resume process will also set the > power state to AC_PWRST_D0, but I think there is a problem with this process. > > (1)suspend: > > azx_probe_continue > snd_card_register > .. > snd_hda_codec_dev_register > snd_hda_codec_register > snd_hda_power_down > pm_runtime_put_autosuspend > __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); > rpm_suspend > > static int rpm_suspend(struct device *dev, int rpmflags) > { > /**/ > if (rpmflags & RPM_ASYNC) { > dev->power.request = (rpmflags & RPM_AUTO) ? > RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; > if (!dev->power.request_pending) { > dev->power.request_pending = true; > queue_work(pm_wq, &dev->power.work); > } > goto out; > } > > __update_runtime_status(dev, RPM_SUSPENDING); > > /**/ > retval = rpm_callback(callback, dev); > __update_runtime_status(dev, RPM_SUSPENDED); > /**/ > } > > The first call to rpm_suspend has the RPM_ASYNC flag, so queue_work is called, > and the work queue is used to enter rpm_suspend > > pm_runtime_init > INIT_WORK(&dev->power.work, pm_runtime_work); > > (2)resume: > > azx_probe_continue > set_default_power_save > snd_hda_set_power_save(&chip->bus, val * 1000); > codec_set_power_save(c, delay); > > int val = power_save; > static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;//It is 0 in my .config > > static void codec_set_power_save(struct hda_codec *codec, int delay) > { > struct device *dev = hda_codec_dev(codec); > if (delay == 0 && codec->auto_runtime_pm) > delay = 3000; > > if (delay > 0) { > pm_runtime_set_autosuspend_delay(dev, delay); > pm_runtime_use_autosuspend(dev); > pm_runtime_allow(dev); > if (!pm_runtime_suspended(dev)) > pm_runtime_mark_last_busy(dev); > } else { > pm_runtime_dont_use_autosuspend(dev); > pm_runtime_forbid(dev); > } > } > > pm_runtime_forbid > rpm_resume(dev, 0); > > static int rpm_resume(struct device *dev, int rpmflags) > { > /**/ > if (dev->power.runtime_status == RPM_ACTIVE) { > retval = 1; > goto out; > } > > /**/ > _update_runtime_status(dev, RPM_RESUMING); > retval = rpm_callback(callback, dev); > /**/ > __update_runtime_status(dev, RPM_ACTIVE); > /**/ > } > > The callback functions of suspend and resume are as follows, which set the power state: > > hda_call_codec_suspend > state = hda_set_power_state(codec, AC_PWRST_D3); > > hda_call_codec_resume > hda_set_power_state(codec, AC_PWRST_D0); > > You can see that the resume function relies on dev->power.runtime_status, > and the status is set in rpm_suspend. The operation of rpm_suspend depends > on the scheduling of the work queue. I added print debugging on my machine, > and occasionally there will be pm_runtime_work in Run after rpm_resume. > At this time, the suspend and resume processes are not performed correctly. > In VT1802, the power_state is still D3, and the machine has no sound. > > 4. I searched the Internet and did not find the relevant modification, > but found the commit 317d9313925c (ALSA: hda/realtek-Set default power save node to 0). > > Does VIA need to be modified like this? > > Since I am not familiar with ALSA and runtime pm, so come here to consult. For VIA codecs, there is an additional fixup table to turn off the power_save_node. Add an entry with the PCI SSID of your device to vt2002p_fixups[] table with VIA_FIXUP_POWER_SAVE. thanks, Takashi