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path: root/drivers/usb/host/xhci.h
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Diffstat (limited to 'drivers/usb/host/xhci.h')
-rw-r--r--drivers/usb/host/xhci.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index f9f88626a57a..dc6f62a4b197 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -2580,6 +2580,35 @@ static inline const char *xhci_decode_portsc(u32 portsc)
return str;
}
+static inline const char *xhci_decode_doorbell(u32 slot, u32 doorbell)
+{
+ static char str[256];
+ u8 ep;
+ u16 stream;
+ int ret;
+
+ ep = (doorbell & 0xff);
+ stream = doorbell >> 16;
+
+ if (slot == 0) {
+ sprintf(str, "Command Ring %d", doorbell);
+ return str;
+ }
+ ret = sprintf(str, "Slot %d ", slot);
+ if (ep > 0 && ep < 32)
+ ret = sprintf(str + ret, "ep%d%s",
+ ep / 2,
+ ep % 2 ? "in" : "out");
+ else if (ep == 0 || ep < 248)
+ ret = sprintf(str + ret, "Reserved %d", ep);
+ else
+ ret = sprintf(str + ret, "Vendor Defined %d", ep);
+ if (stream)
+ ret = sprintf(str + ret, " Stream %d", stream);
+
+ return str;
+}
+
static inline const char *xhci_ep_state_string(u8 state)
{
switch (state) {