[ALSA] usb-audio - Fix audiophile-USB quirk for little-endian

Audiophile-usb fix (corrects little-endianness in 16bit
modes, resets interfaces at device initialization, and updates the
documentation).

Signed-off-by: Thibault Le Meur <Thibault.LeMeur@supelec.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 8 insertions, 1 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 8ebc1adb5ed9..834b0aff5ec1 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2350,7 +2350,9 @@ static int is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *
                         return 1;
                 break;
         case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
-                return 1;
+                if (device_setup[chip->index] == 0x00 ||
+                    fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
+                        return 1;
         }
         return 0;
 }
@@ -3251,6 +3253,11 @@ static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
                                          int iface, int altno)
 {
+        /* Reset ALL ifaces to 0 altsetting.
+         * Call it for every possible altsetting of every interface.
+         */
+        usb_set_interface(chip->dev, iface, 0);
+
         if (device_setup[chip->index] & AUDIOPHILE_SET) {
                 if ((device_setup[chip->index] & AUDIOPHILE_SET_DTS)
                     && altno != 6)