[ALSA] hda-codec - Fix Gateway laptops with STAC9200

Fix the output of Gateway laptops with STAC9200 codec chip.
They require the EAPD control for some pins.  These pins shouldn't be
powered down.
To enable EAPD control, a new model 'gateway' was added to STAC9200.
The known PCI SSIDs are included in the quirk list.
The fix was originally suggested by Brian Hinz, in ALSA bug#2948.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 15 insertions, 1 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 239cdd855dfe..187533e477c6 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1630,10 +1630,24 @@ static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,
 
         nid = codec->start_nid;
         for (i = 0; i < codec->num_nodes; i++, nid++) {
-                if (get_wcaps(codec, nid) & AC_WCAP_POWER)
+                if (get_wcaps(codec, nid) & AC_WCAP_POWER) {
+                        unsigned int pincap;
+                        /*
+                         * don't power down the widget if it controls eapd
+                         * and EAPD_BTLENABLE is set.
+                         */
+                        pincap = snd_hda_param_read(codec, nid, AC_PAR_PIN_CAP);
+                        if (pincap & AC_PINCAP_EAPD) {
+                                int eapd = snd_hda_codec_read(codec, nid,
+                                        0, AC_VERB_GET_EAPD_BTLENABLE, 0);
+                                eapd &= 0x02;
+                                if (power_state == AC_PWRST_D3 && eapd)
+                                        continue;
+                        }
                         snd_hda_codec_write(codec, nid, 0,
                                             AC_VERB_SET_POWER_STATE,
                                             power_state);
+                }
         }
 
         if (power_state == AC_PWRST_D0) {