提交 4f0871a6 编写于 作者: A Andiry Xu 提交者: Sarah Sharp

xHCI: Clear PLC in xhci_bus_resume()

This patch clears PORT_PLC if xhci_bus_resume() resumes a previous suspended
port, because if a port transition from U3 to U0 state, it will report a
port link state change, and software should clear the corresponding PLC bit.

It also uses hcd->speed to check if a port is a USB2 protocol port.

The patch fixes the issue that USB keyboard can not wakeup system from
hibernation.
Signed-off-by: NAndiry Xu <andiry.xu@amd.com>
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
上级 cee6a262
......@@ -777,7 +777,7 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
if (t1 != t2)
xhci_writel(xhci, t2, port_array[port_index]);
if (DEV_HIGHSPEED(t1)) {
if (hcd->speed != HCD_USB3) {
/* enable remote wake up for USB 2.0 */
u32 __iomem *addr;
u32 tmp;
......@@ -866,6 +866,21 @@ int xhci_bus_resume(struct usb_hcd *hcd)
temp |= PORT_LINK_STROBE | XDEV_U0;
xhci_writel(xhci, temp, port_array[port_index]);
}
/* wait for the port to enter U0 and report port link
* state change.
*/
spin_unlock_irqrestore(&xhci->lock, flags);
msleep(20);
spin_lock_irqsave(&xhci->lock, flags);
/* Clear PLC */
temp = xhci_readl(xhci, port_array[port_index]);
if (temp & PORT_PLC) {
temp = xhci_port_state_to_neutral(temp);
temp |= PORT_PLC;
xhci_writel(xhci, temp, port_array[port_index]);
}
slot_id = xhci_find_slot_id_by_port(hcd,
xhci, port_index + 1);
if (slot_id)
......@@ -873,7 +888,7 @@ int xhci_bus_resume(struct usb_hcd *hcd)
} else
xhci_writel(xhci, temp, port_array[port_index]);
if (DEV_HIGHSPEED(temp)) {
if (hcd->speed != HCD_USB3) {
/* disable remote wake up for USB 2.0 */
u32 __iomem *addr;
u32 tmp;
......
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