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 <dheitmueller@xxxxxxxxxxxxxx>
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 <hans.verkuil@xxxxxxxxx>
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 },
>
>
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