diff options
| author | Andiry Xu <andiry.xu@amd.com> | 2010-10-14 07:23:06 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:22:13 -0700 |
| commit | 5535b1d5f8885695c6ded783c692e3c0d0eda8ca (patch) | |
| tree | f5454493a1c50e4a6254d904578dc3ecfd1d6e63 /drivers/usb/host/xhci-pci.c | |
| parent | 9777e3ce907d4cb5a513902a87ecd03b52499569 (diff) | |
USB: xHCI: PCI power management implementation
This patch implements the PCI suspend/resume.
Please refer to xHCI spec for doing the suspend/resume operation.
For S3, CSS/SRS in USBCMD is used to save/restore the internal state.
However, an error maybe occurs while restoring the internal state.
In this case, it means that HC internal state is wrong and HC will be
re-initialized.
Signed-off-by: Libin Yang <libin.yang@amd.com>
Signed-off-by: Dong Nguyen <dong.nguyen@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-pci.c')
| -rw-r--r-- | drivers/usb/host/xhci-pci.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index 3865f8c6f647..bb668a894ab9 100644 --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -116,6 +116,30 @@ static int xhci_pci_setup(struct usb_hcd *hcd) return xhci_pci_reinit(xhci, pdev); } +#ifdef CONFIG_PM +static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup) +{ + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + int retval = 0; + + if (hcd->state != HC_STATE_SUSPENDED) + return -EINVAL; + + retval = xhci_suspend(xhci); + + return retval; +} + +static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated) +{ + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + int retval = 0; + + retval = xhci_resume(xhci, hibernated); + return retval; +} +#endif /* CONFIG_PM */ + static const struct hc_driver xhci_pci_hc_driver = { .description = hcd_name, .product_desc = "xHCI Host Controller", @@ -132,7 +156,10 @@ static const struct hc_driver xhci_pci_hc_driver = { */ .reset = xhci_pci_setup, .start = xhci_run, - /* suspend and resume implemented later */ +#ifdef CONFIG_PM + .pci_suspend = xhci_pci_suspend, + .pci_resume = xhci_pci_resume, +#endif .stop = xhci_stop, .shutdown = xhci_shutdown, @@ -188,6 +215,11 @@ static struct pci_driver xhci_pci_driver = { /* suspend and resume implemented later */ .shutdown = usb_hcd_pci_shutdown, +#ifdef CONFIG_PM_SLEEP + .driver = { + .pm = &usb_hcd_pci_pm_ops + }, +#endif }; int xhci_register_pci(void) |