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| author | Andiry Xu <andiry.xu@amd.com> | 2010-10-14 07:22:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:22:12 -0700 |
| commit | be88fe4f4dda93e3264a887745123b1e6c4a6845 (patch) | |
| tree | e0a014c2eb0672da74dc458270fbc6e0a5af48b2 /drivers/usb/host/xhci-mem.c | |
| parent | 85f0ff46960c2853fd1436a56798260eae91db86 (diff) | |
| download | kernel_samsung_smdk4412-be88fe4f4dda93e3264a887745123b1e6c4a6845.zip kernel_samsung_smdk4412-be88fe4f4dda93e3264a887745123b1e6c4a6845.tar.gz kernel_samsung_smdk4412-be88fe4f4dda93e3264a887745123b1e6c4a6845.tar.bz2 | |
USB: xHCI: port power management implementation
Add software trigger USB device suspend resume function hook.
Do port suspend & resume in terms of xHCI spec.
Port Suspend:
Stop all endpoints via Stop Endpoint Command with Suspend (SP) flag set.
Place individual ports into suspend mode by writing '3' for Port Link State
(PLS) field into PORTSC register. This can only be done when the port is in
Enabled state. When writing, the Port Link State Write Strobe (LWS) bit shall
be set to '1'.
Allocate an xhci_command and stash it in xhci_virt_device to wait completion for
the last Stop Endpoint Command. Use the Suspend bit in TRB to indicate the Stop
Endpoint Command is for port suspend. Based on Sarah's suggestion.
Port Resume:
Write '0' in PLS field, device will transition to running state.
Ring an endpoints' doorbell to restart it.
Ref: USB device remote wake need another patch to implement. For details of
how USB subsystem do power management, please see:
Documentation/usb/power-management.txt
Signed-off-by: Crane Cai <crane.cai@amd.com>
Signed-off-by: Libin Yang <libin.yang@amd.com>
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-mem.c')
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index be90180..858a828 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -867,6 +867,7 @@ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *ud top_dev = top_dev->parent) /* Found device below root hub */; slot_ctx->dev_info2 |= (u32) ROOT_HUB_PORT(top_dev->portnum); + dev->port = top_dev->portnum; xhci_dbg(xhci, "Set root hub portnum to %d\n", top_dev->portnum); /* Is this a LS/FS device under a HS hub? */ |