From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> commit 0522b9a1653048440da5f21747f21e498b9220d1 upstream. One USB3 roothub port may support link power management, while another root port on the same xHC can't due to different retimers used for the ports. This is the case with Intel Alder Lake, and possible future platforms where retimers used for USB4 ports cause too long exit latecy to enable native USB3 lpm U1 and U2 states. Add a flag in the xhci port structure to indicate if the port is lpm_incapable, and check it while calculating exit latency. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20230116142216.1141605-6-mathias.nyman@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 8 ++++++++ drivers/usb/host/xhci.h | 1 + 2 files changed, 9 insertions(+) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -5049,6 +5049,7 @@ static int xhci_enable_usb3_lpm_timeout( struct usb_device *udev, enum usb3_link_state state) { struct xhci_hcd *xhci; + struct xhci_port *port; u16 hub_encoded_timeout; int mel; int ret; @@ -5065,6 +5066,13 @@ static int xhci_enable_usb3_lpm_timeout( if (xhci_check_tier_policy(xhci, udev, state) < 0) return USB3_LPM_DISABLED; + /* If connected to root port then check port can handle lpm */ + if (udev->parent && !udev->parent->parent) { + port = xhci->usb3_rhub.ports[udev->portnum - 1]; + if (port->lpm_incapable) + return USB3_LPM_DISABLED; + } + hub_encoded_timeout = xhci_calculate_lpm_timeout(hcd, udev, state); mel = calculate_max_exit_latency(udev, state, hub_encoded_timeout); if (mel < 0) { --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1735,6 +1735,7 @@ struct xhci_port { int hcd_portnum; struct xhci_hub *rhub; struct xhci_port_cap *port_cap; + unsigned int lpm_incapable:1; }; struct xhci_hub {
