From: Mathias Nyman mathias.nyman@linux.intel.com
commit 83810f84ecf11dfc5a9414a8b762c3501b328185 upstream.
If ports are not turned off in shutdown then runtime suspended self-powered USB devices may survive in U3 link state over S5.
During subsequent boot, if firmware sends an IPC command to program the port in DISCONNECT state, it will time out, causing significant delay in the boot time.
Turning off roothub port power is also recommended in xhci specification 4.19.4 "Port Power" in the additional note.
Cc: stable@vger.kernel.org Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20220623111945.1557702-3-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci-hub.c | 2 +- drivers/usb/host/xhci.c | 15 +++++++++++++-- drivers/usb/host/xhci.h | 2 ++ 3 files changed, 16 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -652,7 +652,7 @@ struct xhci_hub *xhci_get_rhub(struct us * It will release and re-aquire the lock while calling ACPI * method. */ -static void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd, +void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd, u16 index, bool on, unsigned long *flags) __must_hold(&xhci->lock) { --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -779,6 +779,8 @@ static void xhci_stop(struct usb_hcd *hc void xhci_shutdown(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); + unsigned long flags; + int i;
if (xhci->quirks & XHCI_SPURIOUS_REBOOT) usb_disable_xhci_ports(to_pci_dev(hcd->self.sysdev)); @@ -794,12 +796,21 @@ void xhci_shutdown(struct usb_hcd *hcd) del_timer_sync(&xhci->shared_hcd->rh_timer); }
- spin_lock_irq(&xhci->lock); + spin_lock_irqsave(&xhci->lock, flags); xhci_halt(xhci); + + /* Power off USB2 ports*/ + for (i = 0; i < xhci->usb2_rhub.num_ports; i++) + xhci_set_port_power(xhci, xhci->main_hcd, i, false, &flags); + + /* Power off USB3 ports*/ + for (i = 0; i < xhci->usb3_rhub.num_ports; i++) + xhci_set_port_power(xhci, xhci->shared_hcd, i, false, &flags); + /* Workaround for spurious wakeups at shutdown with HSW */ if (xhci->quirks & XHCI_SPURIOUS_WAKEUP) xhci_reset(xhci, XHCI_RESET_SHORT_USEC); - spin_unlock_irq(&xhci->lock); + spin_unlock_irqrestore(&xhci->lock, flags);
xhci_cleanup_msix(xhci);
--- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -2172,6 +2172,8 @@ int xhci_hub_control(struct usb_hcd *hcd int xhci_hub_status_data(struct usb_hcd *hcd, char *buf); int xhci_find_raw_port_number(struct usb_hcd *hcd, int port1); struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd); +void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd, u16 index, + bool on, unsigned long *flags);
void xhci_hc_died(struct xhci_hcd *xhci);