On Mon, Aug 13, 2018 at 09:34:37PM +0300, Ran Shalit wrote:
> Hello,
>
> I have a strange behabiour with sound card usb.
> I use kernel 3.18.11-rt7 (real-time kernel )
Ugh, please go get support from whomever is forcing you to use such an
old and obsolete kernel version. You are paying them for support,
there's nothing that we can do about this :(
> It takes 10 (!) seconds between detection of usb device till it is
> registered ("registered new interface driver snd-usb-audio") in
> kernel.
> We take the usb device out of reset using another HW.
>
> See below dmesg:
>
> [ 7.911220] ixgbe 0000:01:00.1: registered PHC device on eth1
> [ 8.186213] ixgbe 0000:01:00.1 eth1: NIC Link is Up 1 Gbps, Flow
> Control: RX/TX
> [ 8.218386] NET: Registered protocol family 10
> [ 8.691077] ixgbe 0000:01:00.0 eth0: NIC Link is Down
> [ 9.090808] ixgbe 0000:01:00.1 eth1: NIC Link is Down
> [ 9.893587] ixgbe 0000:01:00.0 eth0: NIC Link is Up 1 Gbps, Flow
> Control: RX/TX
> [ 10.317939] ixgbe 0000:01:00.1 eth1: NIC Link is Up 1 Gbps, Flow
> Control: RX/TX
> [ 38.171328] random: nonblocking pool is initialized
> [ 260.380461] usb 1-2: new full-speed USB device number 2 using xhci_hcd
> [ 260.545907] usb 1-2: config 1 has an invalid descriptor of length
> 0, skipping remainder of the config
> [ 260.546471] usb 1-2: New USB device found, idVendor=0451, idProduct=9010
> [ 260.546478] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [ 260.546484] usb 1-2: Product: TI C55 Ver 6.00
> [ 260.546488] usb 1-2: Manufacturer: Texas Instruments
> [ 260.546491] usb 1-2: SerialNumber: 320001
> [ 260.594916] input: Texas Instruments TI C55 Ver 6.00 as
> /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.3/0003:0451:9010.0001/input/input3
> [ 260.595084] hid-generic 0003:0451:9010.0001: input,hidraw0: USB HID
> v1.11 Device [Texas Instruments TI C55 Ver 6.00] on
> usb-0000:00:14.0-2/input3
> [ 260.595153] usbcore: registered new interface driver usbhid
> [ 260.595157] usbhid: USB HID core driver
> [ 345.706843] usbcore: registered new interface driver snd-usb-audio
>
> Is there any idea what can cause this delay ?
You are loading a new driver from somewhere, that takes time. Odds are
this is a userspace issue.
good luck!
greg k-h
