powermgmt: Don't force shutdown when externally powered

In rare cases, battery voltage at boot can be below the shutdown
threshold even if a charger is plugged in. This triggers a forced
shutdown and tells you to "RECHARGE!" despite there being plenty
of power available, which is annoying.

Tweak the forced shutdown check so it accounts for external power
sources; if any are present, battery voltage will be ignored.

Change-Id: Id6280b0b666df9eef31c37a03c07c9d6d3f50221

1 files changed, 6 insertions, 0 deletions

diff --git a/firmware/powermgmt.c b/firmware/powermgmt.c
index e455127496..95763dc950 100644
--- a/firmware/powermgmt.c
+++ b/firmware/powermgmt.c
@@ -500,6 +500,12 @@ static void power_thread_rtc_process(void)
 /* switch off unit if battery level is too low for reliable operation */
 bool query_force_shutdown(void)
 {
+#if CONFIG_CHARGING
+    /* It doesn't make sense to force shutdown when externally powered. */
+    if (power_input_present())
+        return false;
+#endif
+
 #if defined(NO_LOW_BATTERY_SHUTDOWN)
     return false;
 #elif CONFIG_BATTERY_MEASURE & PERCENTAGE_MEASURE