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: Venu Byravarasu <vbyravarasu@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 568aecc..83d190a 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/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 @@
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");