diff options
| -rw-r--r-- | src/soc/intel/skylake/romstage/power_state.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/romstage/power_state.c b/src/soc/intel/skylake/romstage/power_state.c index cbef09a96c..19875346b4 100644 --- a/src/soc/intel/skylake/romstage/power_state.c +++ b/src/soc/intel/skylake/romstage/power_state.c @@ -158,3 +158,17 @@ int vboot_platform_is_resuming(void) int typ = (inl(ACPI_BASE_ADDRESS + PM1_CNT) & SLP_TYP) >> SLP_TYP_SHIFT; return typ == SLP_TYP_S3; } + +/* + * The PM1 control is set to S5 when vboot requests a reboot because the power + * state code above may not have collected it's data yet. Therefore, set it to + * S5 when vboot requests a reboot. That's necessary if vboot fails in the + * resume path and requests a reboot. This prevents a reboot loop where the + * error is continually hit on the failing vboot resume path. + */ +void vboot_platform_prepare_reboot(void) +{ + uint16_t port = ACPI_BASE_ADDRESS + PM1_CNT; + + outl((inl(port) & ~(SLP_TYP)) | (SLP_TYP_S5 << SLP_TYP_SHIFT), port); +} |