]> git.baikalelectronics.ru Git - kernel.git/commit
xhci: Detect lpm incapable xHC USB3 roothub ports from ACPI tables
authorMathias Nyman <mathias.nyman@linux.intel.com>
Mon, 16 Jan 2023 14:22:16 +0000 (16:22 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 24 Jan 2023 06:17:59 +0000 (07:17 +0100)
commitdd6d5acfe212dd4be3062b850e74bdb53fe16a6a
tree25d8389f87b1c236a1fb666cfd5a900387f4d857
parentf388306550fb3946e73a2b5b51cbacc41ce59bee
xhci: Detect lpm incapable xHC USB3 roothub ports from ACPI tables

commit 74622f0a81d0c2bcfc39f9192b788124e8c7f0af upstream.

USB3 ports on xHC hosts may have retimers that cause too long
exit latency to work with native USB3 U1/U2 link power management states.

For now only use usb_acpi_port_lpm_incapable() to evaluate if port lpm
should be disabled while setting up the USB3 roothub.

Other ways to identify lpm incapable ports can be added here later if
ACPI _DSM does not exist.

Limit this to Intel hosts for now, this is to my knowledge only
an Intel issue.

Cc: stable@vger.kernel.org
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20230116142216.1141605-8-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/host/xhci-pci.c