Re: [PATCH 08/12] Add USB quirk for HVR-950q to avoid intermittent device resets

[Devin Heitmueller]

> I've accepted the other patches in this patch series for the media subsystem,
> but this patch should go through the USB subsystem. Cc-ed linux-usb.
>
> Acked-by: Hans Verkuil 



I'm not sure who on the linux-usb mailing list would need to deal with
this, but would be great if we could get this merged.

Thanks,

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com

Re: [PATCH 08/12] Add USB quirk for HVR-950q to avoid intermittent device resets

[Hans Verkuil]

Hi Devin,

On 04/20/2017 01:13 AM, Devin Heitmueller wrote:
> The USB core and sysfs will attempt to enumerate certain parameters
> which are unsupported by the au0828 - causing inconsistent behavior
> and sometimes causing the chip to reset.  Avoid making these calls.
> 
> This problem manifested as intermittent cases where the au8522 would
> be reset on analog video startup, in particular when starting up ALSA
> audio streaming in parallel - the sysfs entries created by
> snd-usb-audio on streaming startup would result in unsupported control
> messages being sent during tuning which would put the chip into an
> unknown state.
> 
> Signed-off-by: Devin Heitmueller 

I've accepted the other patches in this patch series for the media subsystem,
but this patch should go through the USB subsystem. Cc-ed linux-usb.

Acked-by: Hans Verkuil 

Regards,

Hans

> ---
>  drivers/usb/core/quirks.c | 4 
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
> index 96b21b0..3116edf 100644
> --- a/drivers/usb/core/quirks.c
> +++ b/drivers/usb/core/quirks.c
> @@ -223,6 +223,10 @@
>   /* Blackmagic Design UltraStudio SDI */
>   { USB_DEVICE(0x1edb, 0xbd4f), .driver_info = USB_QUIRK_NO_LPM },
>  
> + /* Hauppauge HVR-950q */
> + { USB_DEVICE(0x2040, 0x7200), .driver_info =
> + USB_QUIRK_CONFIG_INTF_STRINGS },
> +
>   /* INTEL VALUE SSD */
>   { USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },
>  
>