ALSA: hda - Fix power-saving during playing beep sound
While playing the digital beep tone, the codec shouldn't be turned
off. This patch adds proper snd_hda_power_up()/down() calls at each
time when the beep is played or off.
Also, this fixes automatically an unnecessary codec power-up at
detaching the beep device when the beep isn't being played.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
index 0849aac..35bf531 100644
--- a/sound/pci/hda/hda_beep.c
+++ b/sound/pci/hda/hda_beep.c
@@ -39,13 +39,23 @@
struct hda_beep *beep =
container_of(work, struct hda_beep, beep_work);
struct hda_codec *codec = beep->codec;
+ int tone;
if (!beep->enabled)
return;
+ tone = beep->tone;
+ if (tone && !beep->playing) {
+ snd_hda_power_up(codec);
+ beep->playing = 1;
+ }
/* generate tone */
snd_hda_codec_write(codec, beep->nid, 0,
- AC_VERB_SET_BEEP_CONTROL, beep->tone);
+ AC_VERB_SET_BEEP_CONTROL, tone);
+ if (!tone && beep->playing) {
+ beep->playing = 0;
+ snd_hda_power_down(codec);
+ }
}
/* (non-standard) Linear beep tone calculation for IDT/STAC codecs
@@ -115,14 +125,23 @@
return 0;
}
+static void turn_off_beep(struct hda_beep *beep)
+{
+ cancel_work_sync(&beep->beep_work);
+ if (beep->playing) {
+ /* turn off beep */
+ snd_hda_codec_write(beep->codec, beep->nid, 0,
+ AC_VERB_SET_BEEP_CONTROL, 0);
+ beep->playing = 0;
+ snd_hda_power_down(beep->codec);
+ }
+}
+
static void snd_hda_do_detach(struct hda_beep *beep)
{
input_unregister_device(beep->dev);
beep->dev = NULL;
- cancel_work_sync(&beep->beep_work);
- /* turn off beep for sure */
- snd_hda_codec_write(beep->codec, beep->nid, 0,
- AC_VERB_SET_BEEP_CONTROL, 0);
+ turn_off_beep(beep);
}
static int snd_hda_do_attach(struct hda_beep *beep)
@@ -170,12 +189,8 @@
enable = !!enable;
if (beep->enabled != enable) {
beep->enabled = enable;
- if (!enable) {
- cancel_work_sync(&beep->beep_work);
- /* turn off beep */
- snd_hda_codec_write(beep->codec, beep->nid, 0,
- AC_VERB_SET_BEEP_CONTROL, 0);
- }
+ if (!enable)
+ turn_off_beep(beep);
return 1;
}
return 0;
diff --git a/sound/pci/hda/hda_beep.h b/sound/pci/hda/hda_beep.h
index 4dc6933..cb88464 100644
--- a/sound/pci/hda/hda_beep.h
+++ b/sound/pci/hda/hda_beep.h
@@ -36,6 +36,7 @@
hda_nid_t nid;
unsigned int enabled:1;
unsigned int linear_tone:1; /* linear tone for IDT/STAC codec */
+ unsigned int playing:1;
struct work_struct beep_work; /* scheduled task for beep event */
struct mutex mutex;
};