diff options
Diffstat (limited to 'power/tegra.c')
| -rw-r--r-- | power/tegra.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/power/tegra.c b/power/tegra.c index 83dc47bd58..f2f38e123b 100644 --- a/power/tegra.c +++ b/power/tegra.c @@ -78,6 +78,12 @@ */ #define XPSHOLD_DEBOUNCE (30 * 1000) /* 30 ms */ +/* + * The hold time for pulling down the PMIC_WARM_RESET_L pin so that + * the AP can entery the recovery mode (flash SPI flash from USB). + */ +#define PMIC_WARM_RESET_L_HOLD_TIME (4 * MSEC) + /* Application processor power state */ static int ap_on; static int ap_suspended; @@ -318,6 +324,16 @@ static int tegra_power_init(void) if (!(system_get_reset_flags() & RESET_FLAG_SYSJUMP)) { CPRINTF("[%T not sysjump; forcing AP shutdown]\n"); chipset_force_shutdown(); + + /* + * The warm reset triggers AP into the Tegra recovery mode ( + * flash SPI from USB). + */ + CPRINTF("[%T assert GPIO_PMIC_WARM_RESET_L for %d ms]\n", + PMIC_WARM_RESET_L_HOLD_TIME / MSEC); + gpio_set_level(GPIO_PMIC_WARM_RESET_L, 0); + usleep(PMIC_WARM_RESET_L_HOLD_TIME); + gpio_set_level(GPIO_PMIC_WARM_RESET_L, 1); } /* Leave power off only if requested by reset flags */ |