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ALSA: usb-audio: work around KEF X300A firmware bug

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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>
This commit is contained in:
Clemens Ladisch 2014-02-16 17:11:10 +01:00 committed by Takashi Iwai
parent 2078600b1f
commit 624aef494f
1 changed files with 9 additions and 0 deletions
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9
sound/usb/mixer_maps.c
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@ -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 */
};