diff options
Diffstat (limited to 'power/sdm845.c')
| -rw-r--r-- | power/sdm845.c | 65 |
1 files changed, 64 insertions, 1 deletions
diff --git a/power/sdm845.c b/power/sdm845.c index 6c5f033b44..36e041f96d 100644 --- a/power/sdm845.c +++ b/power/sdm845.c @@ -89,6 +89,9 @@ static char power_button_was_pressed; /* 1 if lid-open event has been detected */ static char lid_opened; +/* 1 if AP_RST_L and PS_HOLD is overdriven by EC */ +static char ap_rst_overdriven; + /* * 1 if power state is controlled by special functions, like a console command * or an interrupt handler, for bypassing POWER_GOOD lost trigger. It is @@ -153,6 +156,64 @@ void chipset_reset_request_interrupt(enum gpio_signal signal) hook_call_deferred(&chipset_reset_request_handler_data, 0); } +void chipset_warm_reset_interrupt(enum gpio_signal signal) +{ + /* + * The warm_reset signal is pulled-up by a rail from PMIC. If the + * warm_reset drops, it means: + * * Servo or Cr50 holds the signal, or + * * its pull-up rail POWER_GOOD drops. + */ + if (!gpio_get_level(GPIO_WARM_RESET_L)) { + if (gpio_get_level(GPIO_POWER_GOOD)) { + /* + * Servo or Cr50 holds the WARM_RESET_L signal. + * + * Overdrive AP_RST_L to hold AP. Overdrive PS_HOLD to + * emulate AP being up to trick the PMIC into thinking + * there’s nothing weird going on. + */ + ap_rst_overdriven = 1; + gpio_set_flags(GPIO_PS_HOLD, GPIO_INT_BOTH | + GPIO_SEL_1P8V | GPIO_OUT_HIGH); + gpio_set_flags(GPIO_AP_RST_L, GPIO_INT_BOTH | + GPIO_SEL_1P8V | GPIO_OUT_LOW); + } else { + /* + * The pull-up rail POWER_GOOD drops. + * + * High-Z both AP_RST_L and PS_HOLD to restore their + * states. + */ + gpio_set_flags(GPIO_AP_RST_L, GPIO_INT_BOTH | + GPIO_SEL_1P8V); + gpio_set_flags(GPIO_PS_HOLD, GPIO_INT_BOTH | + GPIO_SEL_1P8V); + ap_rst_overdriven = 0; + } + } else { + if (ap_rst_overdriven) { + /* + * Servo or Cr50 releases the WARM_RESET_L signal. + * + * High-Z both AP_RST_L and PS_HOLD to restore their + * state. Cold reset the PMIC, doing S0->S5->S0 + * transition, to recover the system. + */ + gpio_set_flags(GPIO_AP_RST_L, GPIO_INT_BOTH | + GPIO_SEL_1P8V); + gpio_set_flags(GPIO_PS_HOLD, GPIO_INT_BOTH | + GPIO_SEL_1P8V); + ap_rst_overdriven = 0; + + /* TODO(b/112723105): Do S0->S5->S0 transition here. */ + } + /* If not overdriven, just a normal power-up, do nothing. */ + } + + power_signal_interrupt(signal); +} + static void sdm845_lid_event(void) { /* Power task only cares about lid-open events */ @@ -328,8 +389,10 @@ enum power_state power_chipset_init(void) int init_power_state; uint32_t reset_flags = system_get_reset_flags(); - /* Enable reboot control input from AP */ + /* Enable interrupts */ gpio_enable_interrupt(GPIO_AP_RST_REQ); + gpio_enable_interrupt(GPIO_WARM_RESET_L); + gpio_enable_interrupt(GPIO_POWER_GOOD); /* * Force the AP shutdown unless we are doing SYSJUMP. Otherwise, |