Hi, I'm very new to kernel, so apologies if anything i'm typing here is wrong 1. I'm working on a device (ST-SPEAR600-EVB) with 2.6.32.16 kernel 2. At random time USB keyboard/mouse disconnects and reconnects automatically 3. I tried dumping portstatus and portchange registers in drivers/usb/core/hub.c, Im getting portstatus=0x0100 and portchange=0x0001 4, Then the disconnected port automatically reconnects the device with portstatus=0x0301 and portchange=0x0001 5. Then the usb port enabled with portstatus=0x0303 and portchange=0x0000 6. Sometimes, mouse/keyboard dont event gets detected by kernel after a reboot. I have to plug out and plugin the cable to make them work again. I also used usbmon, But I'm not able to find why the usb port gets device disconnect interrupt the first place. The host controller driver is ehci-spear, the hid devices are handled by usbhid. Here is link to usbmon log, https://drive.google.com/open?id=1GQfSTGhhb5yzUqR7_DETZK-WJl04cbiM The disconnect issue can be filtered with this command zgrep -E ‘0:2048|000:0 |s 23|s a3|002:0 0 4’ usbmonlog.log.201801041153.gz I need know 1. Is there any possibility of drivers (or userspace process) resets those keyboard/mouse ports? if yes, then, how to check? 2. how to check if the reset happend in the host controller? 2. how to check if the reset happend in the hub? 3. how to check if the reset happend in the usb device? with my limited knowledge with usbmon text log file, It seems to be happening in the usb device (interrupts urb traffic takes place first in port then in root hub). I need some hints to proceed further digging. Thanks, Mohan R -- 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
