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authorMengdong Lin <mengdong.lin@intel.com>2015-04-29 11:43:20 +0200
committerTakashi Iwai <tiwai@suse.de>2015-04-29 12:27:52 +0200
commita5e7e07c264bb76d0b7c782766989c491833de05 (patch)
tree35cd2d573347f42a479f65079d17cb9562fd3f4d /sound/pci
parentALSA: hda - implement a refcount for i915 power well switch (diff)
downloadlinux-a5e7e07c264bb76d0b7c782766989c491833de05.tar.xz
linux-a5e7e07c264bb76d0b7c782766989c491833de05.zip
ALSA: hda - allow a codec to control the link power
A flag "link_power_control" is added to indicate whether a codec needs to control the link power. And a new bus ops link_power() is defined for the codec to request to enable/disable the link power. Signed-off-by: Mengdong Lin <mengdong.lin@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci')
-rw-r--r--sound/pci/hda/hda_codec.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 2d8883fbde2b..a85242f7f973 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -857,6 +857,7 @@ void snd_hda_codec_register(struct hda_codec *codec)
return;
if (device_is_registered(hda_codec_dev(codec))) {
snd_hda_register_beep_device(codec);
+ snd_hdac_link_power(&codec->core, true);
pm_runtime_enable(hda_codec_dev(codec));
/* it was powered up in snd_hda_codec_new(), now all done */
snd_hda_power_down(codec);
@@ -883,6 +884,7 @@ static int snd_hda_codec_dev_free(struct snd_device *device)
struct hda_codec *codec = device->device_data;
codec->in_freeing = 1;
+ snd_hdac_link_power(&codec->core, false);
snd_hdac_device_unregister(&codec->core);
put_device(hda_codec_dev(codec));
return 0;
@@ -3102,6 +3104,7 @@ static int hda_codec_runtime_suspend(struct device *dev)
if (codec_has_clkstop(codec) && codec_has_epss(codec) &&
(state & AC_PWRST_CLK_STOP_OK))
snd_hdac_codec_link_down(&codec->core);
+ snd_hdac_link_power(&codec->core, false);
return 0;
}
@@ -3109,6 +3112,7 @@ static int hda_codec_runtime_resume(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
+ snd_hdac_link_power(&codec->core, true);
snd_hdac_codec_link_up(&codec->core);
hda_call_codec_resume(codec);
pm_runtime_mark_last_busy(dev);