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| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2022-10-24 17:27:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-10-25 19:53:41 +0200 |
| commit | 34cd2db408d591bc15771cbcc90939ade0a99a21 (patch) | |
| tree | 69e081cf98580ae6c1e0b0c08fc3ece4744e9185 /drivers/usb/host/xhci.h | |
| parent | 4f547472380136718b56064ea5689a61e135f904 (diff) | |
| download | lwn-34cd2db408d591bc15771cbcc90939ade0a99a21.tar.gz lwn-34cd2db408d591bc15771cbcc90939ade0a99a21.zip | |
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 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>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index c0964fe8ac12..cc084d9505cd 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -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; |