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ALSA: hda - Sync node attributes at resume from widget power saving

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So far we assumed that the node attributes like amp values remain
during the power state transition of the node itself.  While this is
true for IDT/STAC codecs I've tested, but some other codecs don't seem
behaving in that way.

This patch implements a partial sync mechanism specific to the given
widget node.  Now we've merged the regmap support, and it can be
easily written with regcache_sync_region().

Tested-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-04-04 12:17:28 +02:00
parent 664bc5c559
commit d545a57c5f
2 changed files with 14 additions and 4 deletions
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12
include/sound/hda_regmap.h
View file

@ -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 */

6
sound/pci/hda/hda_generic.c
View file

@ -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;