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authorTakashi Iwai <tiwai@suse.de>2013-03-13 14:47:21 +0100
committerTakashi Iwai <tiwai@suse.de>2013-03-13 18:07:05 +0100
commitba615b86d6a3ba6e244973672c63903c8b2831a3 (patch)
treea519ed1086a43f33036e3dc3d30b4892a1289835 /sound/pci/hda/hda_local.h
parentbce0d2a80e428aac3b39bf19675f1f57126f9cb6 (diff)
downloadlinux-ba615b86d6a3ba6e244973672c63903c8b2831a3.tar.bz2
ALSA: hda - Don't apply EAPD power filter as default
So far, the driver doesn't power down the widget at going down to D3 when the widget node has an EAPD capability and EAPD is actually set on all codecs unless codec->power_filter is set explicitly. This caused a problem on some Conexant codecs, leading to click noises, and we set it as NULL there. But it is very unlikely that the problem hits only these codecs. Looking back at the development history, this workaround for EAPD was introduced just for some laptops with STAC9200 codec, then we applied it blindly for all. Now, since it's revealed to have an ill effect, we should disable this workaround per default and apply only for the known requiring systems. The EAPD workaround is implemented now as snd_hda_codec_eapd_power_filter(), and this has to be set explicitly by the codec driver when needed. As of now, only patch_stac9200() sets this one. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/hda/hda_local.h')
-rw-r--r--sound/pci/hda/hda_local.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 83b7486c8eff..e0bf7534fa1f 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -670,6 +670,10 @@ snd_hda_check_power_state(struct hda_codec *codec, hda_nid_t nid,
return (state != target_state);
}
+unsigned int snd_hda_codec_eapd_power_filter(struct hda_codec *codec,
+ hda_nid_t nid,
+ unsigned int power_state);
+
/*
* AMP control callbacks
*/