From dd59e5f5da03cc584113fad9ede13bc81c48dee8 Mon Sep 17 00:00:00 2001 From: Louis Yung-Chieh Lo Date: Tue, 10 Dec 2013 15:40:57 -0800 Subject: nyan: propagate EC reset to the AP reset for old boards. New boards (rev >= 2.2) are not affected since chipset_force_shutdown() is called. On old boards the power rails of old boards are not removed completely. This CL ensures the AP is warm-reset after EC is reset. BUG=None BRANCH=nyan TEST=nVidia verified on old boards. Change-Id: Ia2c2b243534d8a73b9b4d5320aad4664b1ac8b12 Signed-off-by: Louis Yung-Chieh Lo Reviewed-on: https://chromium-review.googlesource.com/179521 Reviewed-by: Randall Spangler --- power/tegra.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'power') 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 */ -- cgit v1.2.1