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

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 */
};