• Lan Tianyu's avatar
    usb: add find_raw_port_number callback to struct hc_driver() · 3f5eb141
    Lan Tianyu authored
    xhci driver divides the root hub into two logical hubs which work
    respectively for usb 2.0 and usb 3.0 devices. They are independent
    devices in the usb core. But in the ACPI table, it's one device node
    and all usb2.0 and usb3.0 ports are under it. Binding usb port with
    its acpi node needs the raw port number which is reflected in the xhci
    extended capabilities table. This patch is to add find_raw_port_number
    callback to struct hc_driver(), fill it with xhci_find_raw_port_number()
    which will return raw port number and add a wrap usb_hcd_find_raw_port_number().
    
    Otherwise, refactor xhci_find_real_port_number(). Using
    xhci_find_raw_port_number() to get real index in the HW port status
    registers instead of scanning through the xHCI roothub port array.
    This can help to speed up.
    
    All addresses in xhci->usb2_ports and xhci->usb3_ports array are
    kown good ports and don't include following bad ports in the extended
    capabilities talbe.
         (1) root port that doesn't have an entry
         (2) root port with unknown speed
         (3) root port that is listed twice and with different speeds.
    
    So xhci_find_raw_port_number() will only return port num of good ones
    and never touch bad ports above.
    Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
    Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
    3f5eb141
xhci-mem.c 73.7 KB