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link: Hibernate EC when battery level drops below 2%

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We already shut down the main processor below 3%.  Hibernating the EC
below 2% will further cut power draw and minimize the risk of
deep-discharging the battery.

BUG=chrome-os-partner:14839
BRANCH=link
TEST=manual

1) discharge battery below 3%; system should shut down.  when powered
on again it should shut back down within ~10 sec.

2) discharge battery below 2%; when system shuts down it should also hibernate.

(I've also tested this with a hacked smart_battery.c which lies about
the battery state of charge, since that's faster than waiting for my
battery to discharge.)

Change-Id: I504ba927012430db5cf10b895a36e6cd6fdf4c8b
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34793
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
This commit is contained in:
Randall Spangler
2012-10-05 11:09:49 -07:00
committed by Gerrit
parent 1173102ae1
commit fcd0f0a5e4
2 changed files with 15 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
common/charge_state.c
View File

@@ -98,7 +98,7 @@ static void update_battery_info(void)
}
/* Prevent battery from going into deep discharge state */
static void poweroff_wait_ac(void)
static void poweroff_wait_ac(int hibernate_ec)
{
/* Shutdown the main processor */
if (chipset_in_state(CHIPSET_STATE_ON)) {
@@ -111,6 +111,12 @@ static void poweroff_wait_ac(void)
host_set_single_event(EC_HOST_EVENT_BATTERY_SHUTDOWN);
#endif /* CONFIG_TASK_X86POWER */
}
/* If battery level is critical, hibernate the EC too */
if (hibernate_ec) {
CPRINTF("[%T force EC hibernate to avoid damaging battery]\n");
system_hibernate(0, 0);
}
}
/* Common handler for charging states.
@@ -219,12 +225,14 @@ static int state_common(struct power_state_context *ctx)
}
/* Prevent deep discharging */
if (!curr->ac)
if (!curr->ac) {
if ((batt->state_of_charge < BATTERY_LEVEL_SHUTDOWN &&
!(curr->error & F_BATTERY_STATE_OF_CHARGE)) ||
(batt->voltage <= ctx->battery->voltage_min &&
!(curr->error & F_BATTERY_VOLTAGE)))
poweroff_wait_ac();
poweroff_wait_ac(batt->state_of_charge <
BATTERY_LEVEL_HIBERNATE_EC ? 1 : 0);
}
/* Check battery presence */
if (curr->error & F_BATTERY_MASK) {
@@ -465,7 +473,7 @@ static enum power_state state_discharge(struct power_state_context *ctx)
*/
if (batt->temperature > ctx->battery->temp_discharge_max ||
batt->temperature < ctx->battery->temp_discharge_min)
poweroff_wait_ac();
poweroff_wait_ac(0);
return PWR_STATE_UNCHANGE;
}

3
include/battery.h
View File

@@ -12,7 +12,10 @@
#define BATTERY_LEVEL_WARNING 15
#define BATTERY_LEVEL_LOW 10
#define BATTERY_LEVEL_CRITICAL 5
/* Shut down main processor when battery level reaches this level */
#define BATTERY_LEVEL_SHUTDOWN 3
/* Hibernate EC immediately when battery level reaches this level */
#define BATTERY_LEVEL_HIBERNATE_EC 2
/* Stop charge when state of charge reaches this percentage */
#define STOP_CHARGE_THRESHOLD 100