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diff --git a/sys/dev/usb/controller/xhci.c b/sys/dev/usb/controller/xhci.c
--- a/sys/dev/usb/controller/xhci.c
+++ b/sys/dev/usb/controller/xhci.c
@@ -156,6 +156,7 @@
static void xhci_do_poll(struct usb_bus *);
static void xhci_device_done(struct usb_xfer *, usb_error_t);
+static void xhci_get_xecp(struct xhci_softc *);
static void xhci_root_intr(struct xhci_softc *);
static void xhci_free_device_ext(struct usb_device *);
static struct xhci_endpoint_ext *xhci_get_endpoint_ext(struct usb_device *,
@@ -566,6 +567,8 @@
device_printf(self, "%d bytes context size, %d-bit DMA\n",
sc->sc_ctx_is_64_byte ? 64 : 32, (int)sc->sc_bus.dma_bits);
+ xhci_get_xecp(sc);
+
/* enable 64Kbyte control endpoint quirk */
sc->sc_bus.control_ep_quirk = (xhcictlquirk ? 1 : 0);
@@ -653,6 +656,88 @@
sx_destroy(&sc->sc_cmd_sx);
}
+static void
+xhci_get_xecp(struct xhci_softc *sc)
+{
+
+ uint32_t hccp1;
+ uint32_t eec;
+ uint32_t eecp;
+ bool first = true;
+
+ hccp1 = XREAD4(sc, capa, XHCI_HCSPARAMS0);
+
+ if (XHCI_HCS0_XECP(hccp1) == 0) {
+ device_printf(sc->sc_bus.parent,
+ "xECP: no capabilities found\n");
+ return;
+ }
+
+ /*
+ * Parse the xECP Capabilities table and print known caps.
+ * Implemented, vendor and reserved xECP Capabilities values are
+ * documented in Table 7.2 of eXtensible Host Controller Interface for
+ * Universal Serial Bus (xHCI) Rev 1.2b 2023.
+ */
+ device_printf(sc->sc_bus.parent, "xECP capabilities <");
+
+ eec = -1;
+ for (eecp = XHCI_HCS0_XECP(hccp1) << 2;
+ eecp != 0 && XHCI_XECP_NEXT(eec) != 0;
+ eecp += XHCI_XECP_NEXT(eec) << 2) {
+ eec = XREAD4(sc, capa, eecp);
+
+ uint8_t xecpid = XHCI_XECP_ID(eec);
+
+ if ((xecpid >= 11 && xecpid <= 16) ||
+ (xecpid >= 19 && xecpid <= 191)) {
+ if (!first)
+ printf(",");
+ printf("RES(%x)", xecpid);
+ } else if (xecpid > 191) {
+ if (!first)
+ printf(",");
+ printf("VEND(%x)", xecpid);
+ } else {
+ if (!first)
+ printf(",");
+ switch (xecpid)
+ {
+ case XHCI_ID_USB_LEGACY:
+ printf("LEGACY");
+ break;
+ case XHCI_ID_PROTOCOLS:
+ printf("PROTO");
+ break;
+ case XHCI_ID_POWER_MGMT:
+ printf("POWER");
+ break;
+ case XHCI_ID_VIRTUALIZATION:
+ printf("VIRT");
+ break;
+ case XHCI_ID_MSG_IRQ:
+ printf("MSG IRQ");
+ break;
+ case XHCI_ID_USB_LOCAL_MEM:
+ printf("LOCAL MEM");
+ break;
+ case XHCI_ID_USB_DEBUG:
+ printf("DEBUG");
+ break;
+ case XHCI_ID_EXT_MSI:
+ printf("EXT MSI");
+ break;
+ case XHCI_ID_USB3_TUN:
+ printf("TUN");
+ break;
+
+ }
+ }
+ first = false;
+ }
+ printf(">\n");
+}
+
static void
xhci_set_hw_power_sleep(struct usb_bus *bus, uint32_t state)
{
diff --git a/sys/dev/usb/controller/xhcireg.h b/sys/dev/usb/controller/xhcireg.h
--- a/sys/dev/usb/controller/xhcireg.h
+++ b/sys/dev/usb/controller/xhcireg.h
@@ -205,6 +205,11 @@
#define XHCI_ID_VIRTUALIZATION 0x0004
#define XHCI_ID_MSG_IRQ 0x0005
#define XHCI_ID_USB_LOCAL_MEM 0x0006
+/* values 7-9 are reserved */
+#define XHCI_ID_USB_DEBUG 0x000a
+/* values 11-16 are reserved */
+#define XHCI_ID_EXT_MSI 0x0011
+#define XHCI_ID_USB3_TUN 0x0012
/* XHCI register R/W wrappers */
#define XREAD1(sc, what, a) \

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