Hello, I hope this is the right place to query, if not I apologize. I have an android device which runs 2.6.32 kernel(v. old) which randomly disconnects all downstream devices from the single usb port occasionally. The issue seems to start from ehci reporting a power change event as in the below logs, I was hoping to make sense of what the below logs mean (especially first couple of lines) and some direction as to how to debug this issue. It looks like some sort of electrical/hardware issue but ill let the experts comment on it. The device 1-0:1.0 seem to be an interrupt ep of Tegra ehci. There is a Genesys Logic controller hub connected to the usb port. Thanks in advance for any pointers. <7>[ 1493.733165] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002 <7>[ 1493.733245] tegra-ehci tegra-ehci.2: GetStatus port 1 status c00100a POWER sig=se0 PEC CSC <7>[ 1493.733297] hub 1-0:1.0: port 1, status 0100, change 0003, 12 Mb/s <6>[ 1493.733329] usb 1-1: USB disconnect, address 2 <7>[ 1493.737847] tegra-ehci tegra-ehci.2: detected XactErr len 0/2048 retry 1 <7>[ 1493.737957] usb 1-1.1.3.3: unlink qh1-0e01/c737bc80 start 0 [1/3 us] <6>[ 1493.738038] usb 1-1.1: USB disconnect, address 16 <7>[ 1493.742814] tegra-ehci tegra-ehci.2: detected XactErr len 0/2048 retry 2 <7>[ 1493.742968] usb 1-1.1.3.2: unlink qh2-0e01/c737b740 start 0 [1/2 us] <6>[ 1493.743097] usb 1-1.1.1: USB disconnect, address 20 <7>[ 1493.748676] usb 1-1.1.1: unregistering device <7>[ 1493.748688] usb 1-1.1.1: usb_disable_device nuking all URBs <7>[ 1493.748741] usb 1-1.1.1: unlink qh8-0e01/c5e0f200 start 7 [1/2 us] <7>[ 1493.748768] tegra-ehci tegra-ehci.2: shutdown urb c58f0280 ep1in-intr <7>[ 1493.748785] usb 1-1.1.1: unlink qh128-0e01/c947db00 start 24 [1/2 us] <7>[ 1493.748807] tegra-ehci tegra-ehci.2: shutdown urb c58f0200 ep2in-intr <7>[ 1493.748821] usb 1-1.1.1: unregistering interface 1-1.1.1:1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
