diff options
Diffstat (limited to 'board/cr50/ap_uart_state.c')
| -rw-r--r-- | board/cr50/ap_uart_state.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/board/cr50/ap_uart_state.c b/board/cr50/ap_uart_state.c index 191ecee95b..54fe92f2f1 100644 --- a/board/cr50/ap_uart_state.c +++ b/board/cr50/ap_uart_state.c @@ -4,11 +4,13 @@ * * AP UART state machine */ +#include "case_closed_debug.h" #include "ccd_config.h" #include "common.h" #include "console.h" #include "gpio.h" #include "hooks.h" +#include "timer.h" #include "uart_bitbang.h" #include "uartn.h" @@ -93,7 +95,7 @@ void ap_detect_asserted(enum gpio_signal signal) /** * Detect state machine */ -static void ap_uart_detect(void) +static void ap_uart_poll(void) { /* Disable interrupts if we had them on for debouncing */ gpio_disable_interrupt(GPIO_DETECT_AP_UART); @@ -130,4 +132,27 @@ static void ap_uart_detect(void) else set_state(DEVICE_STATE_DEBOUNCING); } -DECLARE_HOOK(HOOK_SECOND, ap_uart_detect, HOOK_PRIO_DEFAULT); + +static void ap_uart_detect(void); +DECLARE_DEFERRED(ap_uart_detect); + +static void ap_uart_detect(void) +{ + ap_uart_poll(); + + /* + * Some platforms require that the H1 reacts to the AP shutting down + * within 100 ms. + * + * It takes up to three polls to detect AP shutdown, hence let's limit + * poll interval to 33 ms when CCD is active. + * + * UART is shut off unconditionally when CCD is inactive, no need to + * poll too often in that case, as increased poll frequency causes + * increased power consumption. + */ + hook_call_deferred(&ap_uart_detect_data, ccd_ext_is_enabled() ? + 33 * MSEC : SECOND); +} + +DECLARE_HOOK(HOOK_INIT, ap_uart_detect, HOOK_PRIO_DEFAULT); |