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>
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index b18e00e..9f3115e 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1165,17 +1165,72 @@
static void handle_port_status(struct xhci_hcd *xhci,
union xhci_trb *event)
{
+ struct usb_hcd *hcd = xhci_to_hcd(xhci);
u32 port_id;
+ u32 temp, temp1;
+ u32 __iomem *addr;
+ int ports;
+ int slot_id;
/* Port status change events always have a successful completion code */
if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) {
xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
xhci->error_bitmask |= 1 << 8;
}
- /* FIXME: core doesn't care about all port link state changes yet */
port_id = GET_PORT_ID(event->generic.field[0]);
xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id);
+ ports = HCS_MAX_PORTS(xhci->hcs_params1);
+ if ((port_id <= 0) || (port_id > ports)) {
+ xhci_warn(xhci, "Invalid port id %d\n", port_id);
+ goto cleanup;
+ }
+
+ addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS * (port_id - 1);
+ temp = xhci_readl(xhci, addr);
+ if ((temp & PORT_CONNECT) && (hcd->state == HC_STATE_SUSPENDED)) {
+ xhci_dbg(xhci, "resume root hub\n");
+ usb_hcd_resume_root_hub(hcd);
+ }
+
+ if ((temp & PORT_PLC) && (temp & PORT_PLS_MASK) == XDEV_RESUME) {
+ xhci_dbg(xhci, "port resume event for port %d\n", port_id);
+
+ temp1 = xhci_readl(xhci, &xhci->op_regs->command);
+ if (!(temp1 & CMD_RUN)) {
+ xhci_warn(xhci, "xHC is not running.\n");
+ goto cleanup;
+ }
+
+ if (DEV_SUPERSPEED(temp)) {
+ xhci_dbg(xhci, "resume SS port %d\n", port_id);
+ temp = xhci_port_state_to_neutral(temp);
+ temp &= ~PORT_PLS_MASK;
+ temp |= PORT_LINK_STROBE | XDEV_U0;
+ xhci_writel(xhci, temp, addr);
+ slot_id = xhci_find_slot_id_by_port(xhci, port_id);
+ if (!slot_id) {
+ xhci_dbg(xhci, "slot_id is zero\n");
+ goto cleanup;
+ }
+ xhci_ring_device(xhci, slot_id);
+ xhci_dbg(xhci, "resume SS port %d finished\n", port_id);
+ /* Clear PORT_PLC */
+ temp = xhci_readl(xhci, addr);
+ temp = xhci_port_state_to_neutral(temp);
+ temp |= PORT_PLC;
+ xhci_writel(xhci, temp, addr);
+ } else {
+ xhci_dbg(xhci, "resume HS port %d\n", port_id);
+ xhci->resume_done[port_id - 1] = jiffies +
+ msecs_to_jiffies(20);
+ mod_timer(&hcd->rh_timer,
+ xhci->resume_done[port_id - 1]);
+ /* Do the rest in GetPortStatus */
+ }
+ }
+
+cleanup:
/* Update event ring dequeue pointer before dropping the lock */
inc_deq(xhci, xhci->event_ring, true);