This has been copied from the U-Boot ehci driver.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/usb/usb_ehci_core.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/usb_ehci_core.c b/drivers/usb/usb_ehci_core.c
index f3611cd..c5d4da3 100644
--- a/drivers/usb/usb_ehci_core.c
+++ b/drivers/usb/usb_ehci_core.c
@@ -676,6 +676,8 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
ehci_writel(status_reg, reg);
break;
} else {
+ int ret;
+
reg |= EHCI_PS_PR;
reg &= ~EHCI_PS_PE;
ehci_writel(status_reg, reg);
@@ -686,6 +688,22 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
*/
wait_ms(50);
ehci->portreset |= 1 << le16_to_cpu(req->index);
+ /* terminate the reset */
+ ehci_writel(status_reg, reg & ~EHCI_PS_PR);
+ /*
+ * A host controller must terminate the reset
+ * and stabilize the state of the port within
+ * 2 milliseconds
+ */
+ ret = handshake(status_reg, EHCI_PS_PR, 0,
+ 2 * 1000);
+ if (!ret)
+ ehci->portreset |=
+ 1 << le16_to_cpu(req->index);
+ else
+ printf("port(%d) reset error\n",
+ le16_to_cpu(req->index) - 1);
+
}
break;
default:
--
1.7.1
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