From 705c333a7ad2003ad99d96c19a31619b19ad14b9 Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Wed, 30 Nov 2022 11:19:41 +0200 Subject: [PATCH] xhci: export two xhci_hub functions for xhci-pci module usage some Intel Alder Lake xHC hosts on ChromeOS platforms need special workarounds touching port registers at xHC pci host hibernate. Export xhci_port_state_to_neutral() and xhci_find_slot_id_by_port() so they can be called from xhci-pci.c and thus the xhci-pci module. Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20221130091944.2171610-4-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-hub.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 4619d5e89d5b..94c94db3faf6 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -426,24 +426,37 @@ static unsigned int xhci_port_speed(unsigned int port_status) */ #define XHCI_PORT_RZ ((1<<2) | (1<<24) | (0xf<<28)) -/* +/** + * xhci_port_state_to_neutral() - Clean up read portsc value back into writeable + * @state: u32 port value read from portsc register to be cleanup up + * * Given a port state, this function returns a value that would result in the * port being in the same state, if the value was written to the port status * control register. * Save Read Only (RO) bits and save read/write bits where * writing a 0 clears the bit and writing a 1 sets the bit (RWS). * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect. + * + * Return: u32 value that can be written back to portsc register without + * changing port state. */ + u32 xhci_port_state_to_neutral(u32 state) { /* Save read-only status and port state */ return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS); } +EXPORT_SYMBOL_GPL(xhci_port_state_to_neutral); -/* - * find slot id based on port number. - * @port: The one-based port number from one of the two split roothubs. +/** + * xhci_find_slot_id_by_port() - Find slot id of a usb device on a roothub port + * @hcd: pointer to hcd of the roothub + * @xhci: pointer to xhci structure + * @port: one-based port number of the port in this roothub. + * + * Return: Slot id of the usb device connected to the root port, 0 if not found */ + int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci, u16 port) { @@ -465,6 +478,7 @@ int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci, return slot_id; } +EXPORT_SYMBOL_GPL(xhci_find_slot_id_by_port); /* * Stop device