From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Clemens Ladisch , Takashi Iwai Subject: [PATCH 3.4 19/99] ALSA: usb-audio: work around KEF X300A firmware bug Date: Fri, 7 Mar 2014 17:07:15 -0800 Message-Id: <20140308010612.236637868@linuxfoundation.org> In-Reply-To: <20140308010611.468206150@linuxfoundation.org> References: <20140308010611.468206150@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Clemens Ladisch commit 624aef494f86ed0c58056361c06347ad62b26806 upstream. 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. Signed-off-by: Clemens Ladisch Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/mixer_maps.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/sound/usb/mixer_maps.c +++ b/sound/usb/mixer_maps.c @@ -304,6 +304,11 @@ static struct usbmix_name_map hercules_u { 0 } /* terminator */ }; +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 */ @@ -371,6 +376,10 @@ static struct usbmix_ctl_map usbmix_ctl_ .map = scratch_live_map, .ignore_ctl_error = 1, }, + { + .id = USB_ID(0x27ac, 0x1000), + .map = kef_x300a_map, + }, { 0 } /* terminator */ };