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nyan: propagate EC reset to the AP reset for old boards.

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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 <yjlou@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179521
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Louis Yung-Chieh Lo
2013-12-10 15:40:57 -08:00
committed by chrome-internal-fetch
parent f749c9363c
commit dd59e5f5da
3 changed files with 18 additions and 0 deletions
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1
board/nyan/board.c
View File

@@ -85,6 +85,7 @@ const struct gpio_info gpio_list[] = {
{"CHARGING", GPIO_A, (1<<11), GPIO_OUT_LOW, NULL},
{"EC_BL_OVERRIDE", GPIO_H, (1<<1), GPIO_ODR_HIGH, NULL},
{"PMIC_THERM_L", GPIO_A, (1<<1), GPIO_ODR_HIGH, NULL},
{"PMIC_WARM_RESET_L", GPIO_C, (1<<3), GPIO_OUT_HIGH, NULL},
};
BUILD_ASSERT(ARRAY_SIZE(gpio_list) == GPIO_COUNT);

1
board/nyan/board.h
View File

@@ -88,6 +88,7 @@ enum gpio_signal {
GPIO_CHARGING,
GPIO_EC_BL_OVERRIDE,
GPIO_PMIC_THERM_L,
GPIO_PMIC_WARM_RESET_L,
/* Number of GPIOs; not an actual GPIO */
GPIO_COUNT
};

16
power/tegra.c
View File

@@ -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 */