[alsa-devel] [PATCH 0/4] More aggressive PM for HD-audio

[Hui Wang]

On 03/26/2015 09:52 PM, Takashi Iwai wrote:
> At Thu, 26 Mar 2015 14:10:17 +0100,
> Takashi Iwai wrote:
>> At Thu, 26 Mar 2015 20:24:43 +0800,
>> Hui Wang wrote:
>>> On 03/21/2015 02:38 PM, Hui Wang wrote:
>>>> On 03/21/2015 12:20 AM, David Henningsson wrote:
>>>>> On 2015-03-18 09:50, Takashi Iwai wrote:
>>>>>> Hi,
>>>>>>
>>>>>> here is a patchset for supporting more aggressive PM for HD-audio.
>>>>>> This allows to change the power state of each widget more dynamically
>>>>>> with jack and stream states.  It's activated only when the codec
>>>>>> driver (or via sysfs or f/w patch) sets codec->power_mgmt flag.
>>>>>>
>>>>>> In theory, this should work for the recent Realtek codecs, but
>>>>>> currently I have no machine for test.
>>>>>>
>>>>>> David, could you or your team check whether this works for ALC282 or
>>>>>> such?  Just add like:
>>>>>>
>>>>>> --- a/sound/pci/hda/patch_realtek.c
>>>>>> +++ b/sound/pci/hda/patch_realtek.c
>>>>>> @@ -5415,6 +5415,7 @@ static int patch_alc269(struct hda_codec *codec)
>>>>>>
>>>>>>        spec = codec->spec;
>>>>>>        spec->gen.shared_mic_vref_pin = 0x18;
>>>>>> +    codec->power_mgmt = 1;
>>>>>>
>>>>>>        snd_hda_pick_fixup(codec, alc269_fixup_models,
>>>>>>                   alc269_fixup_tbl, alc269_fixups);
>>>>>>
>>>>>>
>>>>>> The patchset is for for-next branch of sound git tree, but they might
>>>>>> be applicable to 4.0-rc (or even older), too.  The current patches are
>>>>>> found in topic/hda-power branch.
>>>>> So I hoped to be able to look at this today, but it turns out the
>>>>> machine I was thinking of using for testing has an ALC262 codec,
>>>>> which hardly counts as "new".
>>>>>
>>>>> Hui, is this something you feel like taking on? Otherwise I'll try to
>>>>> talk to someone in Taipei.
>>>>>
>>>> OK， I will look for the machine to do the test next week.
>>>>
>>>> Regards,
>>>> Hui.
>>>>
>>> Sorry for late response, today is my first day in the office back from
>>> vacation, I checked all machines in the Beijing office, none of them has
>>> the ALC282 codec, I will continue to look for the machine from other office.
>>>
>>> And I did the test on the machines with the alc283, alc255, alc292 and
>>> alc269, the testing result were same, there were no sound output from
>>> internal speaker or headphone, and the internal mic or external mic
>>> can't record any sound. The test steps as below:
>>>
>>> 1. power_save_node = 0
>>> checkout the hda-power branch, build the kernel based on this branch.
>>> Install the kernel to the above machines and boot into the desktop
>>> test internal speaker and internal mic, works very well, plug a headset,
>>> test headphone and external mic, works very well.
>>> run pm_suspend, wait 5 seconds, wakeup the system, redo the above test,
>>> everything works very well.
>> OK, this is expected.  The patch shouldn't touch this case.
>>
>>> 2. power_save_node = 1
>>> enable the power_save_node as below:
>>> @@ -5426,6 +5426,8 @@ static int patch_alc269(struct hda_codec *codec)
>>>
>>>           alc_auto_parse_customize_define(codec);
>>>
>>> +       codec->power_save_node = 1;
>>> +
>>>           if (has_cdefine_beep(codec))
>>>                   spec->gen.beep_nid = 0x01;
>>> rebuild the kernel, install the kernel to the above machines and boot
>>> into the desktop
>>> test internal speaker and internal mic, we can play sound to internal
>>> speaker without any errors, but I can't hear any sound from the speaker;
>>> I can use the internal mic to record without errors, but recorded file
>>> did not include any sound pcm (maybe all 0x00 or 0xff)
>>> I plug a headset into the headset jack, the detection works very well,
>>> but I can't hear sound from headphone when play a sound, and I can't use
>>> headset mic to record any sound as well.
>>>
>>>
>>> And I attached 2 alsa-info.txt, one is the power_save_node=0, the other
>>> is the power_save_node=1
>> Thanks.  The alsa-info.sh outputs show no difference but the power
>> state, so the widget attributes seem kept with the power state change,
>> as it seems.
>>
>> Could you give alsa-info.sh output *during* playing with
>> power_save_node=1?
> Also, try to pull topic/hda-regmap branch in addition, and apply the
> patch below.  This implements the partial sync for the widget path.
> Note that the patch is totally untested.
Got it, I will do the test next Monday, since I can't access those 
machines until next Monday.

Regards,
Hui.
>
> thanks,
>
> Takashi
>
> diff --git a/include/sound/hda_regmap.h b/include/sound/hda_regmap.h
> index 76648ccfbbf8..727a5801e298 100644
> --- a/include/sound/hda_regmap.h
> +++ b/include/sound/hda_regmap.h
> @@ -202,4 +202,16 @@ snd_hdac_regmap_update_amp_stereo(struct hdac_device *codec, hda_nid_t nid,
>   	return snd_hdac_regmap_update_raw(codec, cmd, mask, val);
>   }
>   
> +/**
> + * snd_hdac_regmap_sync_node - sync the widget node attributes
> + * @codec: HD-audio codec
> + * @nid: NID to sync
> + */
> +static inline void
> +snd_hdac_regmap_sync_node(struct hdac_device *codec, hda_nid_t nid)
> +{
> +	regcache_mark_dirty(codec->regmap);
> +	regcache_sync_region(codec->regmap, nid << 20, ((nid + 1) << 20) -1);
> +}
> +
>   #endif /* __SOUND_HDA_REGMAP_H */
> diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
> index f7ccef5559de..1f2ca7be1468 100644
> --- a/sound/pci/hda/hda_generic.c
> +++ b/sound/pci/hda/hda_generic.c
> @@ -842,10 +842,8 @@ static hda_nid_t path_power_update(struct hda_codec *codec,
>   			snd_hda_codec_write(codec, nid, 0,
>   					    AC_VERB_SET_POWER_STATE, state);
>   			changed = nid;
> -			/* here we assume that widget attributes (e.g. amp,
> -			 * pinctl connection) don't change with local power
> -			 * state change.  If not, need to sync the cache.
> -			 */
> +			if (state == AC_PWRST_D0)
> +				snd_hdac_regmap_sync_node(&codec->core, nid);
>   		}
>   	}
>   	return changed;
>