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xhci: Show what USB release number the xHC supports from protocol capablity

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xhci driver displays the supported xHC USB revision in a message during
driver load:

"Host supports USB 3.1 Enhanced SuperSpeed"

Get the USB minor revision number from the xhci protocol capability.
This will show the correct supported revisions for new USB 3.2 and later
hosts

Don't rely on the SBRN (serial bus revision number) register, it's often
showing 0x30 (USB3.0) for hosts that support USB 3.1

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2018-03-16 16:33:06 +02:00 committed by Greg Kroah-Hartman
parent f5249461b5
commit 0ee78c1014
1 changed files with 11 additions and 3 deletions
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14
drivers/usb/host/xhci.c
View file

@ -4838,6 +4838,7 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
* quirks
*/
struct device *dev = hcd->self.sysdev;
unsigned int minor_rev;
int retval;
/* Accept arbitrarily long scatter-gather lists */
@ -4865,12 +4866,19 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
*/
hcd->has_tt = 1;
} else {
/* Some 3.1 hosts return sbrn 0x30, can't rely on sbrn alone */
if (xhci->sbrn == 0x31 || xhci->usb3_rhub.min_rev >= 1) {
xhci_info(xhci, "Host supports USB 3.1 Enhanced SuperSpeed\n");
/*
* Some 3.1 hosts return sbrn 0x30, use xhci supported protocol
* minor revision instead of sbrn
*/
minor_rev = xhci->usb3_rhub.min_rev;
if (minor_rev) {
hcd->speed = HCD_USB31;
hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS;
}
xhci_info(xhci, "Host supports USB 3.%x %s SuperSpeed\n",
minor_rev,
minor_rev ? "Enhanced" : "");
/* xHCI private pointer was set in xhci_pci_probe for the second
* registered roothub.
*/