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authorAndiry Xu <andiry.xu@amd.com>2010-10-14 07:23:06 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:22:13 -0700
commit5535b1d5f8885695c6ded783c692e3c0d0eda8ca (patch)
treef5454493a1c50e4a6254d904578dc3ecfd1d6e63 /drivers/usb/host/xhci-pci.c
parent9777e3ce907d4cb5a513902a87ecd03b52499569 (diff)
downloadop-kernel-dev-5535b1d5f8885695c6ded783c692e3c0d0eda8ca.zip
op-kernel-dev-5535b1d5f8885695c6ded783c692e3c0d0eda8ca.tar.gz
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.c34
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 3865f8c..bb668a8 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)
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