8k interrupts/sec with USB hub

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Hi all,

I built a kernel/rootfs for altera SoCkit amd uses the default SoCkit
device tree and I plug when in plug in a USB stick it uses the dwc2
driver.
When doing cat /proc/interrupts I get normal amount of interrupts -
everything seems ok.

However, when I connect the USB stick to a USB hub and then to the
same USB port I get a great amount of interrupts approx. 8000 per
second. Anyone know why this different behaviour?

root@cyclone5:~# cat /proc/interrupts

           CPU0

16:      53922       GIC  29 Edge      twd

17:          0       GIC 199 Level     timer0

18:          0       GIC 136 Level     ffe01000.pdma

26:          0       GIC 190 Level     ffc04000.i2c

27:          0       GIC 191 Level     ffc05000.i2c

29:      24718       GIC 171 Level     dw-mci

40:       1138       GIC 194 Level     serial

41:    3946968       GIC 160 Level     ffb40000.usb, ffb40000.usb,
dwc2_hsotg:usb1



root@cyclone5:~# [  651.854021] usb 1-1: new high-speed USB device
number 7 using dwc2

[  652.065190] usb 1-1: New USB device found, idVendor=05e3, idProduct=0608

[  652.071869] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0

[  652.079007] usb 1-1: Product: USB2.0 Hub

[  652.088468] hub 1-1:1.0: USB hub found

[  652.092830] hub 1-1:1.0: 4 ports detected

[  652.374026] usb 1-1.1: new high-speed USB device number 8 using dwc2

[  652.475473] usb 1-1.1: New USB device found, idVendor=05e3, idProduct=0608

[  652.482331] usb 1-1.1: New USB device strings: Mfr=0, Product=1,
SerialNumber=0

[  652.489639] usb 1-1.1: Product: USB2.0 Hub

[  652.499214] hub 1-1.1:1.0: USB hub found

[  652.503762] hub 1-1.1:1.0: 4 ports detected


I have seen several threads with stating this issue but haven't found
a clear answer.


Regards,

Billy.
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