redonkable
/
remarkable-uboot
1
0
Fork 0
Code Releases Activity

ARM: tegra: shut down USB device controller at boot 

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 patch implements optional
code to shut down the USB controller when U-Boot boots to avoid leaving
a stale USB device present.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
utp
Stephen Warren 2016-01-26 10:59:42 -07:00 committed by Simon Glass
parent e787a58fe2
commit dd8204de15
2 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm/mach-tegra/Kconfig
View File

@ -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

10
arch/arm/mach-tegra/board2.c
View File

@ -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())