pci/pcie/bwctrl.c

81  * @speed_req:	Requested PCIe Link Speed
88 static u16 pcie_bwctrl_select_speed(struct pci_dev *port, enum pci_bus_speed speed_req)
94 	desired_speeds = GENMASK(pci_bus_speed2lnkctl2(speed_req),
126  * @speed_req:	Requested PCIe Link Speed
129  * Attempt to set PCIe Port Link Speed to @speed_req. @speed_req may be
135  * * -EINVAL	- @speed_req is not a PCIe Link Speed
138  * * -EAGAIN	- Link Speed was changed but @speed_req was not achieved
140 int pcie_set_target_speed(struct pci_dev *port, enum pci_bus_speed speed_req,
147 	if (WARN_ON_ONCE(!pcie_valid_speed(speed_req)))
150 	if (bus && bus->cur_bus_speed == speed_req)
153 	target_speed = pcie_bwctrl_select_speed(port, speed_req);
175 	if (!ret && bus && bus->cur_bus_speed != speed_req &&