usb: host: tegra: Reset Tegra USB controller before init

To clear any configurations made by U-Boot on Tegra USB controller,
reset it before init in probe.
Signed-off-by: NVenu Byravarasu <vbyravarasu@nvidia.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
reviewed-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-tegra.c

@@ -28,6 +28,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/usb/ehci_def.h>
 #include <linux/usb/tegra_usb_phy.h>
+#include <linux/clk/tegra.h>
 
 #define TEGRA_USB_BASE			0xC5000000
 #define TEGRA_USB2_BASE			0xC5004000
@@ -691,6 +692,10 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 	if (err)
 		goto fail_clk;
 
+	tegra_periph_reset_assert(tegra->clk);
+	udelay(1);
+	tegra_periph_reset_deassert(tegra->clk);
+
 	tegra->needs_double_reset = of_property_read_bool(pdev->dev.of_node,
 		"nvidia,needs-double-reset");