xhci: Add quirk to reset host back to default state at shutdown
authorMathias Nyman <mathias.nyman@linux.intel.com>
Mon, 24 Oct 2022 14:27:18 +0000 (17:27 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 3 Nov 2022 14:57:49 +0000 (23:57 +0900)
commit3b250824b6d3f109c8c18652280f7120c3803545
tree611b9c9e29c06c9b94d4e048e10b456898a5a068
parent63c7df3c818ef2a1b56977968adf1d37fe6e691b
xhci: Add quirk to reset host back to default state at shutdown

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
drivers/usb/host/xhci.c
drivers/usb/host/xhci.h