USB: xHCI: port remote wakeup implementation

This commit implements port remote wakeup.

When a port is in U3 state and resume signaling is detected from a device,
the port transitions to the Resume state, and the xHC generates a Port Status
Change Event.

For USB3 port, software write a '0' to the PLS field to complete the resume
signaling. For USB2 port, the resume should be signaling for at least 20ms,
irq handler set a timer for port remote wakeup, and then finishes process in
hub_control GetPortStatus.

Some codes are borrowed from EHCI code.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 858a82867e1d..fd888bc0422b 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1803,6 +1803,8 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
         init_completion(&xhci->addr_dev);
         for (i = 0; i < MAX_HC_SLOTS; ++i)
                 xhci->devs[i] = NULL;
+        for (i = 0; i < MAX_HC_PORTS; ++i)
+                xhci->resume_done[i] = 0;
 
         if (scratchpad_alloc(xhci, flags))
                 goto fail;