diff options
Diffstat (limited to 'board/cr50/ap_state.c')
| -rw-r--r-- | board/cr50/ap_state.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/board/cr50/ap_state.c b/board/cr50/ap_state.c index 1dfd73af32..115f067c50 100644 --- a/board/cr50/ap_state.c +++ b/board/cr50/ap_state.c @@ -117,6 +117,17 @@ static void set_state(enum device_state new_state) */ static void deferred_set_ap_off(void) { + /* + * It's important cr50 keeps INT_AP_L enabled whenever the AP is on. + * Check if TPM_RST_L is still asserted before touching the AP state or + * the INT_AP_L signal. It shouldn't be possible for TPM_RST_L to be + * deasserted in set_ap_off. Check the level just to be safe. + * Block the AP state change if it's deasserted. + */ + if (gpio_get_level(GPIO_TPM_RST_L)) { + CPRINTS("AP: ovrd"); + return; + } CPRINTS("AP off"); set_state(DEVICE_STATE_OFF); @@ -254,6 +265,31 @@ void board_closed_loop_reset(void) tpm_rst_asserted(GPIO_TPM_RST_L); } +static void poll_ap_state(void) +{ + /* + * High means the AP is on. If cr50 thinks the AP is off, it missed an + * interrupt. Trigger the deasserted interrupt. + */ + if (gpio_get_level(GPIO_TPM_RST_L)) { + /* + * If cr50 thinks the AP is off while TPM_RST_L is high, it + * missed a falling edge interrupt. Trigger it. + */ + if (!ap_is_on()) { + CPRINTS("appoll: R-"); + tpm_rst_deasserted(GPIO_TPM_RST_L); + } + } else if (ap_is_on()) { + /* + * If cr50 thinks the AP is on while TPM_RST_L is low, it missed + * a falling edge interrupt. Trigger it. + */ + CPRINTS("appoll: -F"); + tpm_rst_asserted(GPIO_TPM_RST_L); + } +} +DECLARE_HOOK(HOOK_SECOND, poll_ap_state, HOOK_PRIO_DEFAULT); /** * Check the initial AP state. */ |