ALSA: hda - Reduce click noise at power-saving
[pandora-kernel.git] / sound / pci / hda / hda_codec.c
index d686f4f..3ecb45d 100644 (file)
@@ -2367,9 +2367,14 @@ static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,
        hda_nid_t nid;
        int i;
 
-       snd_hda_codec_write(codec, fg, 0, AC_VERB_SET_POWER_STATE,
+       /* this delay seems necessary to avoid click noise at power-down */
+       if (power_state == AC_PWRST_D3)
+               msleep(100);
+       snd_hda_codec_read(codec, fg, 0, AC_VERB_SET_POWER_STATE,
                            power_state);
-       msleep(10); /* partial workaround for "azx_get_response timeout" */
+       /* partial workaround for "azx_get_response timeout" */
+       if (power_state == AC_PWRST_D0)
+               msleep(10);
 
        nid = codec->start_nid;
        for (i = 0; i < codec->num_nodes; i++, nid++) {