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 568aecc7075b4d345bc59bb033570c6e034b9ebc..83d190a1cafd19a56db4dcb52072beaaa93bc96a 100644 (file)
--- 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 @@ 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");