diff options
| -rw-r--r-- | arch/arm/mach-tegra/Kconfig | 13 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/board2.c | 10 |
2 files changed, 22 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig index 48a387c..0b2852c 100644 --- a/arch/arm/mach-tegra/Kconfig +++ b/arch/arm/mach-tegra/Kconfig @@ -52,6 +52,19 @@ config TEGRA210 endchoice +config TEGRA_DISCONNECT_UDC_ON_BOOT + bool "Disconnect USB device mode controller on boot" + default y + help + When loading U-Boot into RAM over USB protocols using tools such as + tegrarcm or L4T's exec-uboot.sh/tegraflash.py, Tegra's USB device + mode controller is initialized and enumerated by the host PC running + the tool. Unfortunately, these tools do not shut down the USB + controller before executing the downloaded code, and so the host PC + does not "de-enumerate" the USB device. This option shuts down the + USB controller when U-Boot boots to avoid leaving a stale USB device + present. + config SYS_MALLOC_F_LEN default 0x1800 diff --git a/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c index a650abd..60e19c8 100644 --- a/arch/arm/mach-tegra/board2.c +++ b/arch/arm/mach-tegra/board2.c @@ -34,8 +34,8 @@ #ifdef CONFIG_TEGRA_CLOCK_SCALING #include <asm/arch/emc.h> #endif -#ifdef CONFIG_USB_EHCI_TEGRA #include <asm/arch-tegra/usb.h> +#ifdef CONFIG_USB_EHCI_TEGRA #include <usb.h> #endif #ifdef CONFIG_TEGRA_MMC @@ -201,6 +201,14 @@ void gpio_early_init(void) __attribute__((weak, alias("__gpio_early_init"))); int board_early_init_f(void) { +#if defined(CONFIG_TEGRA_DISCONNECT_UDC_ON_BOOT) +#define USBCMD_FS2 (1 << 15) + { + struct usb_ctlr *usbctlr = (struct usb_ctlr *)0x7d000000; + writel(USBCMD_FS2, &usbctlr->usb_cmd); + } +#endif + /* Do any special system timer/TSC setup */ #if defined(CONFIG_TEGRA_SUPPORT_NON_SECURE) if (!tegra_cpu_is_non_secure()) |