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samus: enabled fast charging for EVT ATL cells

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Enable fast charging with profile designed for ATL cells
that will be used in EVT.

BUG=chrome-os-partner:23776
BRANCH=none
TEST=Took detailed charging/discharging data and verified
that the actual profile matches the desired profile and that
the fast charging profile is actually faster than the
standard. See bug report for more info and data collected.

Change-Id: Ic11ab89e48afb73987b8013abf8b0564e1138156
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/212980
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
This commit is contained in:
Alec Berg
2014-08-18 16:25:12 -07:00
committed by chrome-internal-fetch
parent cf4abddca8
commit ccb45ff8a2
1 changed files with 51 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
driver/battery/samus.c
View File

@@ -46,7 +46,7 @@ const struct battery_info *battery_get_info(void)
#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
static int fast_charging_allowed;
static int fast_charging_allowed = 1;
/*
* This can override the smart battery's charging profile. To make a change,
@@ -58,6 +58,15 @@ static int fast_charging_allowed;
*/
int charger_profile_override(struct charge_state_data *curr)
{
/* temp in 0.1 deg C */
int temp_c = curr->batt.temperature - 2731;
/* keep track of last temperature range for hysteresis */
static enum {
TEMP_LOW,
TEMP_NORMAL,
TEMP_HIGH
} temp_range = TEMP_NORMAL;
/* We only want to override how we charge, nothing else. */
if (curr->state != ST_CHARGE)
return 0;
@@ -66,25 +75,48 @@ int charger_profile_override(struct charge_state_data *curr)
if (!fast_charging_allowed)
return 0;
/* Okay, impose our custom will */
curr->requested_current = 9000;
curr->requested_voltage = 8300;
if (curr->batt.current <= 6300) {
curr->requested_current = 6300;
curr->requested_voltage = 8400;
} else if (curr->batt.current <= 4500) {
curr->requested_current = 4500;
curr->requested_voltage = 8500;
} else if (curr->batt.current <= 2700) {
curr->requested_current = 2700;
/*
* Okay, impose our custom will:
* When battery is 15-45C:
* CC at 9515mA @ 8.3V
* CV at 8.3V until current drops to 4759mA
* CC at 4759mA @ 8.7V
* CV at 8.7V
*
* When battery is <15C:
* CC at 2854mA @ 8.7V
* CV at 8.7V
*
* When battery is >45C:
* CC at 6660mA @ 8.3V
* CV at 8.3V (when battery is hot we don't go to fully charged)
*
* Add 0.2 degrees of hysteresis.
*/
if (temp_c < 149)
temp_range = TEMP_LOW;
else if (temp_c > 151 && temp_c < 449)
temp_range = TEMP_NORMAL;
else if (temp_c > 451)
temp_range = TEMP_HIGH;
switch (temp_range) {
case TEMP_LOW:
curr->requested_current = 2854;
curr->requested_voltage = 8700;
} else if (curr->batt.current <= 475) {
/*
* Should we stop? If so, how do we start again?
* For now, just use the battery's profile.
*/
curr->requested_current = curr->batt.desired_current;
curr->requested_voltage = curr->batt.desired_voltage;
break;
case TEMP_NORMAL:
curr->requested_current = 9515;
curr->requested_voltage = 8300;
if (curr->batt.current <= 4759 && curr->batt.voltage >= 8250) {
curr->requested_current = 4759;
curr->requested_voltage = 8700;
}
break;
case TEMP_HIGH:
curr->requested_current = 6660;
curr->requested_voltage = 8300;
break;
}
return 0;