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USB: xHCI: port remote wakeup implementation

Browse source 
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>
This commit is contained in:
Andiry Xu 2010-10-14 07:23:00 -07:00 committed by Greg Kroah-Hartman
parent be88fe4f4d
commit 5619253187
4 changed files with 101 additions and 6 deletions
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44
drivers/usb/host/xhci-hub.c
View file

@ -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 @@ static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
/*
* 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;
}

2
drivers/usb/host/xhci-mem.c
View file

@ -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;

57
drivers/usb/host/xhci-ring.c
View file

@ -1165,17 +1165,72 @@ static void handle_vendor_event(struct xhci_hcd *xhci,
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);

4
drivers/usb/host/xhci.h
View file

@ -1215,6 +1215,7 @@ struct xhci_hcd {
u32 port_c_suspend[8]; /* port suspend change*/
u32 suspended_ports[8]; /* which ports are
suspended */
unsigned long resume_done[MAX_HC_PORTS];
};
/* For testing purposes */
@ -1459,6 +1460,9 @@ void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
char *buf, u16 wLength);
int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);
u32 xhci_port_state_to_neutral(u32 state);
int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port);
void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);
/* xHCI contexts */
struct xhci_input_control_ctx *xhci_get_input_control_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);