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, "nvidia,needs-double-reset"); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
