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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