D5884.diff
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	Index: head/sys/mips/mediatek/mtk_usb_phy.c
	===================================================================
	--- head/sys/mips/mediatek/mtk_usb_phy.c
	+++ head/sys/mips/mediatek/mtk_usb_phy.c
	@@ -206,6 +206,11 @@
	return (0);
	}

	+/*
	+ * Things currently seem to work a lot better without slew rate calibration
	+ * both on MT7621 and MT7688, so we leave it out for now.
	+ */
	+#ifdef notyet
	static void
	mtk_usb_phy_slew_rate_calibration(struct mtk_usb_phy_softc *sc)
	{
	@@ -250,10 +255,12 @@
	USB_PHY_BARRIER(sc);
	}
	}
	+#endif

	static void
	mtk_usb_phy_mt7621_init(device_t dev)
	{
	+#ifdef notyet
	struct mtk_usb_phy_softc *sc = device_get_softc(dev);

	/* Slew rate calibration only, but for 2 ports */
	@@ -261,6 +268,7 @@

	sc->u2_base = MT7621_U2_BASE_P1;
	mtk_usb_phy_slew_rate_calibration(sc);
	+#endif
	}

	static void
	@@ -286,8 +294,10 @@
	USB_PHY_WRITE_U2(sc, U2_PHY_DTM0, 0x02000000);
	USB_PHY_BARRIER(sc);

	+#ifdef notyet
	/* Slew rate calibration */
	- //mtk_usb_phy_slew_rate_calibration(sc);
	+ mtk_usb_phy_slew_rate_calibration(sc);
	+#endif
	}

	static device_method_t mtk_usb_phy_methods[] = {