From c214e564acb2ad9463293ab9c109bfdae91fbeaf Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Fri, 24 Jul 2020 12:08:40 -0700 Subject: [PATCH] platform/chrome: cros_ec_proto: ignore unnecessary wakeups on old ECs ECs that don't implement EC_CMD_HOST_EVENT_GET_WAKE_MASK should still have some reasonable default mask -- otherwise, they'll treat a variety of EC signals as spurious wakeups. Battery and AC events can be especially common, for devices that have been sitting at full charge plugged into AC for a long time, as they may cycle their charging off and on, or their battery may start reporting failures as it ages. Treating these as wakeups does not serve a useful purpose, and is instead often counterproductive. And indeed, later ECs (that implement the mask) don't include these events in their wake-mask. Note that this patch doesn't do anything without the subsequent patch ("platform/chrome: cros_ec_proto: check for missing EC_CMD_HOST_EVENT_GET_WAKE_MASK"), because cros_ec_get_host_event_wake_mask() currently does not return an error if EC_CMD_HOST_EVENT_GET_WAKE_MASK is not implemented. Some additional notes: While the EC typically knows not to wake the CPU for these unimportant events once the CPU reaches a sleep state, it doesn't really have a way to know that the CPU is "almost" asleep, unless it has support for EC_CMD_HOST_SLEEP_EVENT. Alas, these older ECs do not support that command either, so this solution is not 100% complete. Signed-off-by: Brian Norris Signed-off-by: Enric Balletbo i Serra --- drivers/platform/chrome/cros_ec_proto.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 11a2db7cd0f7..b6b583b5868a 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -469,14 +469,26 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev) &ver_mask); ec_dev->host_sleep_v1 = (ret >= 0 && (ver_mask & EC_VER_MASK(1))); - /* - * Get host event wake mask, assume all events are wake events - * if unavailable. - */ + /* Get host event wake mask. */ ret = cros_ec_get_host_event_wake_mask(ec_dev, proto_msg, &ec_dev->host_event_wake_mask); - if (ret < 0) - ec_dev->host_event_wake_mask = U32_MAX; + if (ret < 0) { + /* + * If the EC doesn't support EC_CMD_HOST_EVENT_GET_WAKE_MASK, + * use a reasonable default. Note that we ignore various + * battery, AC status, and power-state events, because (a) + * those can be quite common (e.g., when sitting at full + * charge, on AC) and (b) these are not actionable wake events; + * if anything, we'd like to continue suspending (to save + * power), not wake up. + */ + ec_dev->host_event_wake_mask = U32_MAX & + ~(BIT(EC_HOST_EVENT_AC_DISCONNECTED) | + BIT(EC_HOST_EVENT_BATTERY_LOW) | + BIT(EC_HOST_EVENT_BATTERY_CRITICAL) | + BIT(EC_HOST_EVENT_PD_MCU) | + BIT(EC_HOST_EVENT_BATTERY_STATUS)); + } ret = 0; -- 2.39.5