Fix EHCI port reset.

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>

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index ba85991e864ad940adc28a080f9068a1130ae485..9ebeb4f23dd2f4e2a31abd85a1751f30d522edc4 100644 (file)
--- 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;