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xhci: Add quirk to reset host back to default state at shutdown 

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 83810f84ec ("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>
This commit is contained in:
Mathias Nyman 2022-10-24 17:27:18 +03:00 committed by Greg Kroah-Hartman
parent 4f54747238
commit 34cd2db408
3 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/usb/host/xhci-pci.c
View File

@ -257,6 +257,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
pdev->device == PCI_DEVICE_ID_INTEL_DNV_XHCI))
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 ||

10
drivers/usb/host/xhci.c
View File

@ -810,9 +810,15 @@ 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);

1
drivers/usb/host/xhci.h
View File

@ -1897,6 +1897,7 @@ struct xhci_hcd {
#define XHCI_BROKEN_D3COLD BIT_ULL(41)
#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;