usb/xhci: ignore xhci version while checking for the link quirk

instead of reading the xhci interface version each time _even_ if the
quirk is not required, simply check if the quirk flag is set. This flag
is only set of the module parameter is set and here is where I moved the
version check to.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 2 insertions, 4 deletions

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dd0dc15680b6..7583b24c3387 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -316,7 +316,7 @@ int xhci_init(struct usb_hcd *hcd)
 
         xhci_dbg(xhci, "xhci_init\n");
         spin_lock_init(&xhci->lock);
-        if (link_quirk) {
+        if (xhci->hci_version == 0x95 && link_quirk) {
                 xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
                 xhci->quirks |= XHCI_LINK_TRB_QUIRK;
         } else {
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index b224b20b0784..13f1c23ed19d 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1526,9 +1526,7 @@ static inline void xhci_write_64(struct xhci_hcd *xhci,
 
 static inline int xhci_link_trb_quirk(struct xhci_hcd *xhci)
 {
-        u32 temp = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
-        return ((HC_VERSION(temp) == 0x95) &&
-                        (xhci->quirks & XHCI_LINK_TRB_QUIRK));
+        return xhci->quirks & XHCI_LINK_TRB_QUIRK;
 }
 
 /* xHCI debugging */