ALSA: hda - Reduce click noise at power-saving

[pandora-kernel.git] / sound / pci / hda / patch_sigmatel.c

diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 41b5b3a..00c702d 100644 (file)
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -4745,6 +4745,20 @@ static int stac92xx_hp_check_power_status(struct hda_codec *codec,
 static int stac92xx_suspend(struct hda_codec *codec, pm_message_t state)
 {
        struct sigmatel_spec *spec = codec->spec;
+       int i;
+       hda_nid_t nid;
+
+       /* reset each pin before powering down DAC/ADC to avoid click noise */
+       nid = codec->start_nid;
+       for (i = 0; i < codec->num_nodes; i++, nid++) {
+               unsigned int wcaps = get_wcaps(codec, nid);
+               unsigned int wid_type = (wcaps & AC_WCAP_TYPE) >>
+                       AC_WCAP_TYPE_SHIFT;
+               if (wid_type == AC_WID_PIN)
+                       snd_hda_codec_read(codec, nid, 0,
+                               AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
+       }
+
        if (spec->eapd_mask)
                stac_gpio_set(codec, spec->gpio_mask,
                                spec->gpio_dir, spec->gpio_data &