diff options
Diffstat (limited to 'arch/arm/mach-tegra/board2.c')
| -rw-r--r-- | arch/arm/mach-tegra/board2.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c index d3497a2673..224efc97c5 100644 --- a/arch/arm/mach-tegra/board2.c +++ b/arch/arm/mach-tegra/board2.c @@ -181,6 +181,12 @@ int board_init(void) return nvidia_board_init(); } +void board_cleanup_before_linux(void) +{ + /* power down UPHY PLL */ + tegra_xusb_padctl_exit(); +} + #ifdef CONFIG_BOARD_EARLY_INIT_F static void __gpio_early_init(void) { @@ -211,6 +217,31 @@ int board_early_init_f(void) arch_timer_init(); #endif +#if defined(CONFIG_DISABLE_SDMMC1_EARLY) + /* + * Turn off (reset/disable) SDMMC1 on Nano here, before GPIO INIT. + * We do this because earlier bootloaders have enabled power to + * SDMMC1 on Nano, and toggling power-gpio (PZ3) in pinmux_init() + * results in power being back-driven into the SD-card and SDMMC1 + * HW, which is 'bad' as per the HW team. + * + * From the HW team: "LDO2 from the PMIC has already been set to 3.3v in + * nvtboot/CBoot on Nano (for SD-card boot). So when U-Boot's GPIO_INIT + * table sets PZ3 to OUT0 as per the pinmux spreadsheet, it turns off + * the loadswitch. When PZ3 is 0 and not driving, essentially the SDCard + * voltage turns off. Since the SDCard voltage is no longer there, the + * SDMMC CLK/DAT lines are backdriving into what essentially is a + * powered-off SDCard, that's why the voltage drops from 3.3V to ~1.6V" + * + * Note that this can probably be removed when we change over to storing + * all BL components on QSPI on Nano, and U-Boot then becomes the first + * one to turn on SDMMC1 power. Another fix would be to have CBoot + * disable power/gate SDMMC1 off before handing off to U-Boot/kernel. + */ + reset_set_enable(PERIPH_ID_SDMMC1, 1); + clock_set_enable(PERIPH_ID_SDMMC1, 0); +#endif /* CONFIG_DISABLE_SDMMC1_EARLY */ + pinmux_init(); board_init_uart_f(); |