diff options
author | Andiry Xu <andiry.xu@amd.com> | 2010-10-14 16:23:00 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 19:22:13 +0200 |
commit | 561925318725a41189a69f36ebe99199b3fb84c4 (patch) | |
tree | e84c72692f8fd9ed67c298db17d26ccb9970a7a8 /drivers/usb/host/xhci-hub.c | |
parent | USB: xHCI: port power management implementation (diff) | |
download | linux-561925318725a41189a69f36ebe99199b3fb84c4.tar.xz linux-561925318725a41189a69f36ebe99199b3fb84c4.zip |
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.c | 44 |
1 files changed, 39 insertions, 5 deletions
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 14b48b261e06..8163f17e7043 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; } |