ALSA: usb-audio: work around KEF X300A firmware bug
authorClemens Ladisch <clemens@ladisch.de>
Sun, 16 Feb 2014 16:11:10 +0000 (17:11 +0100)
committerTakashi Iwai <tiwai@suse.de>
Mon, 17 Feb 2014 09:11:54 +0000 (10:11 +0100)
When the driver tries to access Function Unit 10, the KEF X300A
speakers' firmware apparently locks up, making even PCM streaming
impossible.  Work around this by ignoring this FU.

Cc: <stable@vger.kernel.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/mixer_maps.c

index 32af6b741ef5a8aff8581f90b0c5d583d151a6ee..d1d72ff50347a3118c2e90d5452457b8948ad0d6 100644 (file)
@@ -328,6 +328,11 @@ static struct usbmix_name_map gamecom780_map[] = {
        {}
 };
 
+static const struct usbmix_name_map kef_x300a_map[] = {
+       { 10, NULL }, /* firmware locks up (?) when we try to access this FU */
+       { 0 }
+};
+
 /*
  * Control map entries
  */
@@ -419,6 +424,10 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
                .id = USB_ID(0x200c, 0x1018),
                .map = ebox44_map,
        },
+       {
+               .id = USB_ID(0x27ac, 0x1000),
+               .map = kef_x300a_map,
+       },
        { 0 } /* terminator */
 };