28 Mar
2013
28 Mar
'13
3:28 p.m.
Dear Vivek Gautam,
Power on root hubs' ports only when they are not yet powered on. Its seen with USB 3.0 ports that they are powered on after a H/W reset, as also reflected in XHCI spec (sec 4.3): "After a Chip Hardware Reset, HCRST, or commanded to the PLS = RxDetect state, all Root Hub ports shall be in Disconnected state, i.e. the port is powered on (PP = 1)"
Signed-off-by: Amar amarendra.xt@samsung.com Signed-off-by: Vivek Gautam gautam.vivek@samsung.com
Just wondering if we shouldn't power-cycle all the ports instead -- aka. turn them off and then turn all of them on again.
Best regards, Marek Vasut