Change Details

This submitted diff file is based from the discussion here https://lists.freebsd.org/archives/freebsd-arm/2022-May/001329.html on adding extended lines of code in usb_hub.c to be able to further handle USB devices when over-current condition is experienced.

This submitted diff file is based from the discussion here https://lists.freebsd.org/archives/freebsd-arm/2022-May/001329.html on adding extended lines of code in usb_hub.c to be able to further handle USB devices when over-current condition is experienced. As a background, the existing code will shut-off the USB hub port(s) right away after encountering overcurrent and these code extensions will give chance to USB devices by turning on the USB hub port power by calling usbd_req_set_port_feature() with UHF_PORT_POWER argument. Turning on the USB hub port power will verify if the current gets normalized when a USB device is already plugged-in to a port because unlike the first time when the USB device is inserted, there's a tendency of an abrupt current being introduced to the system. So, when there's overcurrent situation and when the USB device status is normal, the wPortChange value will just change from 0x0008 (UPS_C_OVERCURRENT_INDICATOR) to 0x0001 (UPS_C_CONNECT_STATUS) otherwise when the USB device status is not normal, it will be re-validated for overcurrent situation thus calling again the usbd_req_clear_port_feature() with UHF_C_PORT_OVER_CURRENT argument to sets the ports power to shut-off.

This submitted diff file is based from the discussion here https://lists.freebsd.org/archives/freebsd-arm/2022-May/001329.html on adding extended lines of code in usb_hub.c to be able to further handle USB devices when over-current condition is experienced. As a background, the existing code will shut-off the USB hub port(s) right away after encountering overcurrent and these code extensions will give chance to USB devices by turning on the USB hub port power by calling usbd_req_set_port_feature() with UHF_PORT_POWER argument. Turning on the USB hub port power will verify if the current gets normalized when a USB device is already plugged-in to a port because unlike the first time when the USB device is inserted, there's a tendency of an abrupt current being introduced to the system. So, when there's overcurrent situation and when the USB device status is normal, the wPortChange value will just change from 0x0008 (UPS_C_OVERCURRENT_INDICATOR) to 0x0001 (UPS_C_CONNECT_STATUS) otherwise when the USB device status is not normal, it will be re-validated for overcurrent situation thus calling again the usbd_req_clear_port_feature() with UHF_C_PORT_OVER_CURRENT argument to sets the ports power to shut-off.