git: 5e54bb1ea9e9 - main - usb: dwc3: implement hw.usb.xhci.use_polling

The branch main has been updated by kevans:

URL: https://cgit.FreeBSD.org/src/commit/?id=5e54bb1ea9e904075225dc96641c2ede3fc3273c

commit 5e54bb1ea9e904075225dc96641c2ede3fc3273c
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2023-02-28 01:59:43 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2023-02-28 22:16:14 +0000

    usb: dwc3: implement hw.usb.xhci.use_polling
    
    Polling is currently only implemented in the xhci pci attachment.
    Adding it to dwc3 doesn't make it much uglier, and supporting it can be
    useful for confirming that hardware's otherwise functional when
    interrupts are apparently not firing.
    
    Reviewed by:    manu
    Differential Revision:  https://reviews.freebsd.org/D38816
---
 sys/dev/usb/controller/dwc3.c | 34 ++++++++++++++++++++++++++++------
 1 file changed, 28 insertions(+), 6 deletions(-)

diff --git a/sys/dev/usb/controller/dwc3.c b/sys/dev/usb/controller/dwc3.c
index 361db0f5e835..dc5c90df0d72 100644
--- a/sys/dev/usb/controller/dwc3.c
+++ b/sys/dev/usb/controller/dwc3.c
@@ -103,6 +103,17 @@ struct snps_dwc3_softc {
 
 #define	IS_DMA_32B	1
 
+static void
+xhci_interrupt_poll(void *_sc)
+{
+	struct xhci_softc *sc = _sc;
+
+	USB_BUS_UNLOCK(&sc->sc_bus);
+	xhci_interrupt(sc);
+	USB_BUS_LOCK(&sc->sc_bus);
+	usb_callout_reset(&sc->sc_callout, 1, (void *)&xhci_interrupt_poll, sc);
+}
+
 static int
 snps_dwc3_attach_xhci(device_t dev)
 {
@@ -133,12 +144,14 @@ snps_dwc3_attach_xhci(device_t dev)
 	sprintf(sc->sc_vendor, "Synopsys");
 	device_set_desc(sc->sc_bus.bdev, "Synopsys");
 
-	err = bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
-	    NULL, (driver_intr_t *)xhci_interrupt, sc, &sc->sc_intr_hdl);
-	if (err != 0) {
-		device_printf(dev, "Failed to setup IRQ, %d\n", err);
-		sc->sc_intr_hdl = NULL;
-		return (err);
+	if (xhci_use_polling() == 0) {
+		err = bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
+		    NULL, (driver_intr_t *)xhci_interrupt, sc, &sc->sc_intr_hdl);
+		if (err != 0) {
+			device_printf(dev, "Failed to setup IRQ, %d\n", err);
+			sc->sc_intr_hdl = NULL;
+			return (err);
+		}
 	}
 
 	err = xhci_init(sc, dev, IS_DMA_32B);
@@ -147,6 +160,15 @@ snps_dwc3_attach_xhci(device_t dev)
 		return (ENXIO);
 	}
 
+	usb_callout_init_mtx(&sc->sc_callout, &sc->sc_bus.bus_mtx, 0);
+
+	if (xhci_use_polling() != 0) {
+		device_printf(dev, "Interrupt polling at %dHz\n", hz);
+		USB_BUS_LOCK(&sc->sc_bus);
+		xhci_interrupt_poll(sc);
+		USB_BUS_UNLOCK(&sc->sc_bus);
+	}
+
 	err = xhci_start_controller(sc);
 	if (err != 0) {
 		device_printf(dev, "Failed to start XHCI controller, with error %d\n", err);