From: Brian Norris briannorris@chromium.org
[ Upstream commit 6ad16b78a039b45294b1ad5d69c14ac57b2fe706 ]
EC_MKBP_EVENT_SENSOR_FIFO events can be triggered for a variety of reasons, and there are very few cases in which they should be treated as wakeup interrupts (particularly, when a certain MOTIONSENSE_MODULE_FLAG_* is set, but this is not even supported in the mainline cros_ec_sensor driver yet). Most of the time, they are benign sensor readings. In any case, the top-level cros_ec device doesn't know enough to determine that they should wake the system, and so it should not report the event. This would be the job of the cros_ec_sensors driver to parse.
This patch adds checks to cros_ec_get_next_event() such that it doesn't signal 'wakeup' for events of type EC_MKBP_EVENT_SENSOR_FIFO.
This patch is particularly relevant on devices like Scarlet (Rockchip RK3399 tablet, known as Acer Chromebook Tab 10), where the EC firmware reports sensor events much more frequently. This was causing /sys/power/wakeup_count to increase very frequently, often needlessly interrupting our ability to suspend the system.
Signed-off-by: Brian Norris briannorris@chromium.org Signed-off-by: Benson Leung bleung@chromium.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/chrome/cros_ec_proto.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index b6fd4838f60f..e5d5b1adb5a9 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -575,6 +575,7 @@ static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event) { + u8 event_type; u32 host_event; int ret;
@@ -594,11 +595,22 @@ int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event) return ret;
if (wake_event) { + event_type = ec_dev->event_data.event_type; host_event = cros_ec_get_host_event(ec_dev);
- /* Consider non-host_event as wake event */ - *wake_event = !host_event || - !!(host_event & ec_dev->host_event_wake_mask); + /* + * Sensor events need to be parsed by the sensor sub-device. + * Defer them, and don't report the wakeup here. + */ + if (event_type == EC_MKBP_EVENT_SENSOR_FIFO) + *wake_event = false; + /* Masked host-events should not count as wake events. */ + else if (host_event && + !(host_event & ec_dev->host_event_wake_mask)) + *wake_event = false; + /* Consider all other events as wake events. */ + else + *wake_event = true; }
return ret;