diff options
Diffstat (limited to 'power')
| -rw-r--r-- | power/sc7180.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/power/sc7180.c b/power/sc7180.c index fe093ad535..69c64206d4 100644 --- a/power/sc7180.c +++ b/power/sc7180.c @@ -100,6 +100,16 @@ */ #define PMIC_POWER_OFF_DELAY (70 * MSEC) +/* The AP_RST_L transition count of a normal AP warm reset */ +#define EXPECTED_AP_RST_TRANSITIONS 3 + +/* + * The timeout of waiting the next AP_RST_L transition. We measured + * the interval between AP_RST_L transitions is 130ms ~ 150ms. Pick + * a safer value. + */ +#define AP_RST_TRANSITION_TIMEOUT (450 * MSEC) + /* TODO(crosbug.com/p/25047): move to HOOK_POWER_BUTTON_CHANGE */ /* 1 if the power button was pressed last time we checked */ static char power_button_was_pressed; @@ -155,6 +165,53 @@ enum power_on_event_t { POWER_ON_EVENT_COUNT, }; +#ifdef CONFIG_CHIPSET_RESET_HOOK +static int ap_rst_transitions; + +static void notify_chipset_reset(void) +{ + if (ap_rst_transitions != EXPECTED_AP_RST_TRANSITIONS) + CPRINTS("AP_RST_L transitions not expected: %d", + ap_rst_transitions); + + ap_rst_transitions = 0; + hook_notify(HOOK_CHIPSET_RESET); +} +DECLARE_DEFERRED(notify_chipset_reset); +#endif + +void chipset_ap_rst_interrupt(enum gpio_signal signal) +{ +#ifdef CONFIG_CHIPSET_RESET_HOOK + int delay; + + /* + * Only care the raising edge and AP in S0/S3. The single raising edge + * of AP power-on during S5S3 is ignored. + */ + if (gpio_get_level(GPIO_AP_RST_L) && + chipset_in_state(CHIPSET_STATE_ON | CHIPSET_STATE_SUSPEND)) { + ap_rst_transitions++; + if (ap_rst_transitions >= EXPECTED_AP_RST_TRANSITIONS) { + /* + * Reach the expected transition count. AP is booting + * up. Notify HOOK_CHIPSET_RESET immediately. + */ + delay = 0; + } else { + /* + * Should have more transitions of the AP_RST_L signal. + * In case the AP_RST_L signal is not toggled, still + * notify HOOK_CHIPSET_RESET. + */ + delay = AP_RST_TRANSITION_TIMEOUT; + } + hook_call_deferred(¬ify_chipset_reset_data, delay); + } +#endif + power_signal_interrupt(signal); +} + /* Issue a request to initiate a reset sequence */ static void request_cold_reset(void) { |