[alsa-devel] [PATCH] ALSA: usb-audio: extend KEF X300A FU 10 tweak to Arcam rPAC

[Takashi Iwai]

At Thu, 18 Dec 2014 02:03:19 +0100,
Jiri Jaburek wrote:
> 
> The Arcam rPAC seems to have the same problem - whenever anything
> (alsamixer, udevd, 3.9+ kernel from 60af3d037eb8c, ..) attempts to
> access mixer / control interface of the card, the firmware "locks up"
> the entire device, resulting in
>   SNDRV_PCM_IOCTL_HW_PARAMS failed (-5): Input/output error
> from alsa-lib.
> 
> Other operating systems can somehow read the mixer (there seems to be
> playback volume/mute), but any manipulation is ignored by the device
> (which has hardware volume controls).
> 
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Jiri Jaburek <jjaburek at redhat.com>

Thanks, applied now.
But at the next time, please put maintainers to Cc.


Takashi

> ---
>  sound/usb/mixer_maps.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
> index 1994d41..b703cb3 100644
> --- a/sound/usb/mixer_maps.c
> +++ b/sound/usb/mixer_maps.c
> @@ -333,8 +333,11 @@ 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 */
> +/* some (all?) SCMS USB3318 devices are affected by a firmware lock up
> + * when anything attempts to access FU 10 (control)
> + */
> +static const struct usbmix_name_map scms_usb3318_map[] = {
> +	{ 10, NULL },
>  	{ 0 }
>  };
>  
> @@ -434,8 +437,14 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
>  		.map = ebox44_map,
>  	},
>  	{
> +		/* KEF X300A */
>  		.id = USB_ID(0x27ac, 0x1000),
> -		.map = kef_x300a_map,
> +		.map = scms_usb3318_map,
> +	},
> +	{
> +		/* Arcam rPAC */
> +		.id = USB_ID(0x25c4, 0x0003),
> +		.map = scms_usb3318_map,
>  	},
>  	{ 0 } /* terminator */
>  };
> -- 
> 2.1.0
> 
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