USB power switch not enabled
|Reported by:||wad||Owned by:|
|Deployments affected:||Action Needed:||code|
On the XO-1.5 prototypes, the USB power switch is not being turned on (by either OFW or Linux.) I'm using version Q3A03 of firmware.
The work-around is to place a zero-ohm resistor at R155, shorting around the USB power switch.
The signal which should be used to enable this power is GPO10 (pin AL18, NOT GPIO10) on the companion chip (alternate function is USBD_PDN#). This signal should be asserted (active high) to provide power to the USB ports.
Note that the power supplied to the USB ports on A1 prototypes is minimal (< 0.3A) due to undersized traces, fixed in later versions.