[PATCH] usb: host: tegra: Reset Tegra USB controller before init

From: Venu Byravarasu
Date: Thu Feb 28 2013 - 01:38:42 EST

To clear any configurations made by U-Boot on Tegra USB controller,
reset it before init in probe.

Signed-off-by: Venu Byravarasu <vbyravarasu@xxxxxxxxxx>
When U-Boot configures a Tegra USB controller in device mode and if the EHCI
driver of kernel tries to set it to HOST mode, message "irq 52: nobody cared"
appears and IRQ gets disabled.

This issue was initially reported with: http://marc.info/?l=linux-tegra&m=136110175423601&w=2

To avoid such issues, due to configurations made by U-Boot driver, reset the
Tegra USB controller, before configuring it by kernel.

drivers/usb/host/ehci-tegra.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

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 @@ 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,


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