ALSA: hda - Fix EAPD GPIO control for Sigmatel codecs

The EAPD GPIO is dynamically turned on/off for some machines with
Sigmatel codecs, but this didn't work as expected, and it resulted in
spontaneous lost of speaker outputs per HP plugging or power-saving.

This patch fixes the bug by simply including spec->eapd_mask into
spec->gpio_mask and spec->gpio_data bits.
Reported-and-tested-by: Eric Shattow <lucent@gmail.com>
Cc: <stable@vger.kernel.org> [v3.9+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -417,10 +417,12 @@ static void stac_update_outputs(struct hda_codec *codec)
 			val &= ~spec->eapd_mask;
 		else
 			val |= spec->eapd_mask;
-		if (spec->gpio_data != val)
+		if (spec->gpio_data != val) {
+			spec->gpio_data = val;
 			stac_gpio_set(codec, spec->gpio_mask, spec->gpio_dir,
 				      val);
 		}
+	}
 }
 
 static void stac_toggle_power_map(struct hda_codec *codec, hda_nid_t nid,
@@ -3612,20 +3614,18 @@ static int stac_parse_auto_config(struct hda_codec *codec)
 static int stac_init(struct hda_codec *codec)
 {
 	struct sigmatel_spec *spec = codec->spec;
-	unsigned int gpio;
 	int i;
 
 	/* override some hints */
 	stac_store_hints(codec);
 
 	/* set up GPIO */
-	gpio = spec->gpio_data;
 	/* turn on EAPD statically when spec->eapd_switch isn't set.
 	 * otherwise, unsol event will turn it on/off dynamically
 	 */
 	if (!spec->eapd_switch)
-		gpio |= spec->eapd_mask;
-	stac_gpio_set(codec, spec->gpio_mask, spec->gpio_dir, gpio);
+		spec->gpio_data |= spec->eapd_mask;
+	stac_gpio_set(codec, spec->gpio_mask, spec->gpio_dir, spec->gpio_data);
 
 	snd_hda_gen_init(codec);
 
@@ -3915,6 +3915,7 @@ static void stac_setup_gpio(struct hda_codec *codec)
 {
 	struct sigmatel_spec *spec = codec->spec;
 
+	spec->gpio_mask |= spec->eapd_mask;
 	if (spec->gpio_led) {
 		if (!spec->vref_mute_led_nid) {
 			spec->gpio_mask |= spec->gpio_led;