From: Mathias Nyman mathias.nyman@linux.intel.com
commit 34cd2db408d591bc15771cbcc90939ade0a99a21 upstream.
Systems based on Alder Lake P see significant boot time delay if boot firmware tries to control usb ports in unexpected link states.
This is seen with self-powered usb devices that survive in U3 link suspended state over S5.
A more generic solution to power off ports at shutdown was attempted in commit 83810f84ecf1 ("xhci: turn off port power in shutdown") but it caused regression.
Add host specific XHCI_RESET_TO_DEFAULT quirk which will reset host and ports back to default state in shutdown.
Cc: stable@vger.kernel.org Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20221024142720.4122053-3-mathias.nyman@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci-pci.c | 4 ++++ drivers/usb/host/xhci.c | 10 ++++++++-- drivers/usb/host/xhci.h | 1 + 3 files changed, 13 insertions(+), 2 deletions(-)
--- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -254,6 +254,10 @@ static void xhci_pci_quirks(struct devic xhci->quirks |= XHCI_MISSING_CAS;
if (pdev->vendor == PCI_VENDOR_ID_INTEL && + pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_PCH_XHCI) + xhci->quirks |= XHCI_RESET_TO_DEFAULT; + + if (pdev->vendor == PCI_VENDOR_ID_INTEL && (pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_XHCI || pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_XHCI || pdev->device == PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_XHCI || --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -794,9 +794,15 @@ void xhci_shutdown(struct usb_hcd *hcd)
spin_lock_irq(&xhci->lock); xhci_halt(xhci); - /* Workaround for spurious wakeups at shutdown with HSW */ - if (xhci->quirks & XHCI_SPURIOUS_WAKEUP) + + /* + * Workaround for spurious wakeps at shutdown with HSW, and for boot + * firmware delay in ADL-P PCH if port are left in U3 at shutdown + */ + if (xhci->quirks & XHCI_SPURIOUS_WAKEUP || + xhci->quirks & XHCI_RESET_TO_DEFAULT) xhci_reset(xhci, XHCI_RESET_SHORT_USEC); + spin_unlock_irq(&xhci->lock);
xhci_cleanup_msix(xhci); --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1889,6 +1889,7 @@ struct xhci_hcd { #define XHCI_NO_SOFT_RETRY BIT_ULL(40) #define XHCI_EP_CTX_BROKEN_DCS BIT_ULL(42) #define XHCI_SUSPEND_RESUME_CLKS BIT_ULL(43) +#define XHCI_RESET_TO_DEFAULT BIT_ULL(44)
unsigned int num_active_eps; unsigned int limit_active_eps;