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authorAndiry Xu <andiry.xu@amd.com>2010-10-14 07:23:00 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:22:13 -0700
commit561925318725a41189a69f36ebe99199b3fb84c4 (patch)
treee84c72692f8fd9ed67c298db17d26ccb9970a7a8 /drivers/usb/host/xhci-hub.c
parentbe88fe4f4dda93e3264a887745123b1e6c4a6845 (diff)
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>
Diffstat (limited to 'drivers/usb/host/xhci-hub.c')
-rw-r--r--drivers/usb/host/xhci-hub.c44
1 files changed, 39 insertions, 5 deletions
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 14b48b261e0..8163f17e704 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -123,7 +123,7 @@ static unsigned int xhci_port_speed(unsigned int port_status)
* writing a 0 clears the bit and writing a 1 sets the bit (RWS).
* For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
*/
-static u32 xhci_port_state_to_neutral(u32 state)
+u32 xhci_port_state_to_neutral(u32 state)
{
/* Save read-only status and port state */
return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
@@ -132,7 +132,7 @@ static u32 xhci_port_state_to_neutral(u32 state)
/*
* find slot id based on port number.
*/
-static int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port)
+int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port)
{
int slot_id;
int i;
@@ -210,7 +210,7 @@ command_cleanup:
/*
* Ring device, it rings the all doorbells unconditionally.
*/
-static void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
+void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
{
int i;
@@ -276,7 +276,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int ports;
unsigned long flags;
- u32 temp, status;
+ u32 temp, temp1, status;
int retval = 0;
u32 __iomem *addr;
int slot_id;
@@ -315,6 +315,34 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
if ((temp & PORT_PLS_MASK) == XDEV_U3
&& (temp & PORT_POWER))
status |= 1 << USB_PORT_FEAT_SUSPEND;
+ if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
+ if ((temp & PORT_RESET) || !(temp & PORT_PE))
+ goto error;
+ if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
+ xhci->resume_done[wIndex])) {
+ xhci_dbg(xhci, "Resume USB2 port %d\n",
+ wIndex + 1);
+ xhci->resume_done[wIndex] = 0;
+ temp1 = xhci_port_state_to_neutral(temp);
+ temp1 &= ~PORT_PLS_MASK;
+ temp1 |= PORT_LINK_STROBE | XDEV_U0;
+ xhci_writel(xhci, temp1, addr);
+
+ xhci_dbg(xhci, "set port %d resume\n",
+ wIndex + 1);
+ slot_id = xhci_find_slot_id_by_port(xhci,
+ wIndex + 1);
+ if (!slot_id) {
+ xhci_dbg(xhci, "slot_id is zero\n");
+ goto error;
+ }
+ xhci_ring_device(xhci, slot_id);
+ xhci->port_c_suspend[wIndex >> 5] |=
+ 1 << (wIndex & 31);
+ xhci->suspended_ports[wIndex >> 5] &=
+ ~(1 << (wIndex & 31));
+ }
+ }
if ((temp & PORT_PLS_MASK) == XDEV_U0
&& (temp & PORT_POWER)
&& (xhci->suspended_ports[wIndex >> 5] &
@@ -500,6 +528,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
{
unsigned long flags;
u32 temp, status;
+ u32 mask;
int i, retval;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int ports;
@@ -512,13 +541,18 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
memset(buf, 0, retval);
status = 0;
+ mask = PORT_CSC | PORT_PEC | PORT_OCC;
+
spin_lock_irqsave(&xhci->lock, flags);
/* For each port, did anything change? If so, set that bit in buf. */
for (i = 0; i < ports; i++) {
addr = &xhci->op_regs->port_status_base +
NUM_PORT_REGS*i;
temp = xhci_readl(xhci, addr);
- if (temp & (PORT_CSC | PORT_PEC | PORT_OCC)) {
+ if ((temp & mask) != 0 ||
+ (xhci->port_c_suspend[i >> 5] & 1 << (i & 31)) ||
+ (xhci->resume_done[i] && time_after_eq(
+ jiffies, xhci->resume_done[i]))) {
buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
status = 1;
}