In USB ehci driver, the port reset is not terminated. EHCI spec says "A host controller must terminate the reset and stabilize the state of the port within 2 milliseconds". Without termination, a port stays at reset state. This is observed on ppc4xx(sequoia) boards.
Signed-off-by: Chris Zhang chris@seamicro.com --- drivers/usb/host/ehci-hcd.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index ba85991..9ebeb4f 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -708,6 +708,9 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer, * root */ wait_ms(50); + /* terminate the reset */ + ehci_writel(status_reg, reg & ~EHCI_PS_PR); + wait_ms(2); portreset |= 1 << le16_to_cpu(req->index); } break;