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authorTakashi Iwai <tiwai@suse.de>2006-06-27 18:28:53 +0200
committerJaroslav Kysela <perex@suse.cz>2006-09-23 10:37:08 +0200
commit6dbe662874ba08585eaf732d126762c25ac8e3f7 (patch)
tree7460c36d4d848f223b682f7a700866bcf6dbc7d5 /sound/drivers
parent2b29b13c5794f648cd5e839796496704d787f5a6 (diff)
downloadop-kernel-dev-6dbe662874ba08585eaf732d126762c25ac8e3f7.zip
op-kernel-dev-6dbe662874ba08585eaf732d126762c25ac8e3f7.tar.gz
[ALSA] Add experimental support of aggressive AC97 power-saving mode
Added CONFIG_SND_AC97_POWER_SAVE kernel config to enable the support of aggressive AC97 power-saving mode. In this mode, the AC97 powerdown register bits are dynamically controlled at each open/close of PCM streams. The mode is activated via power_save option for snd-ac97-codec driver. As default it's off. It can be turned on/off on the fly via sysfs, too. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/drivers')
-rw-r--r--sound/drivers/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/sound/drivers/Kconfig b/sound/drivers/Kconfig
index 395c4ef..897dc2d 100644
--- a/sound/drivers/Kconfig
+++ b/sound/drivers/Kconfig
@@ -100,4 +100,17 @@ config SND_MPU401
To compile this driver as a module, choose M here: the module
will be called snd-mpu401.
+config SND_AC97_POWER_SAVE
+ bool "AC97 Power-Saving Mode"
+ depends on SND_AC97_CODEC && EXPERIMENTAL
+ default n
+ help
+ Say Y here to enable the aggressive power-saving support of
+ AC97 codecs. In this mode, the power-mode is dynamically
+ controlled at each open/close.
+
+ The mode is activated by passing power_save=1 option to
+ snd-ac97-codec driver. You can toggle it dynamically over
+ sysfs, too.
+
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