1 files changed, 25 insertions, 4 deletions

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index bac961cd24ad..67d5dc79b6b5 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -212,6 +212,12 @@ static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
 {
 	int ret;
 
+	ret = clk_prepare_enable(mtk->ref_clk);
+	if (ret) {
+		dev_err(mtk->dev, "failed to enable ref_clk\n");
+		goto ref_clk_err;
+	}
+
 	ret = clk_prepare_enable(mtk->sys_clk);
 	if (ret) {
 		dev_err(mtk->dev, "failed to enable sys_clk\n");
@@ -238,6 +244,8 @@ usb_p1_err:
 usb_p0_err:
 	clk_disable_unprepare(mtk->sys_clk);
 sys_clk_err:
+	clk_disable_unprepare(mtk->ref_clk);
+ref_clk_err:
 	return -EINVAL;
 }
 
@@ -248,6 +256,7 @@ static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk)
 		clk_disable_unprepare(mtk->wk_deb_p0);
 	}
 	clk_disable_unprepare(mtk->sys_clk);
+	clk_disable_unprepare(mtk->ref_clk);
 }
 
 /* only clocks can be turn off for ip-sleep wakeup mode */
@@ -373,7 +382,6 @@ static int usb_wakeup_of_property_parse(struct xhci_hcd_mtk *mtk,
 
 static int xhci_mtk_setup(struct usb_hcd *hcd);
 static const struct xhci_driver_overrides xhci_mtk_overrides __initconst = {
-	.extra_priv_size = sizeof(struct xhci_hcd),
 	.reset = xhci_mtk_setup,
 };
 
@@ -550,6 +558,19 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		return PTR_ERR(mtk->sys_clk);
 	}
 
+	/*
+	 * reference clock is usually a "fixed-clock", make it optional
+	 * for backward compatibility and ignore the error if it does
+	 * not exist.
+	 */
+	mtk->ref_clk = devm_clk_get(dev, "ref_ck");
+	if (IS_ERR(mtk->ref_clk)) {
+		if (PTR_ERR(mtk->ref_clk) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		mtk->ref_clk = NULL;
+	}
+
 	mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
 
 	ret = usb_wakeup_of_property_parse(mtk, node);
@@ -656,13 +677,13 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		goto power_off_phys;
 	}
 
-	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
-		xhci->shared_hcd->can_do_streams = 1;
-
 	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (ret)
 		goto put_usb3_hcd;
 
+	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+		xhci->shared_hcd->can_do_streams = 1;
+
 	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 	if (ret)
 		goto dealloc_usb2_hcd;