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power: pm8921-bms: fix calibration and UVLO issues

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The bms is not running a hkadc calibration before calculating the
first SOC. This causes accuracy issues with the power on SOC.

Also when the battery gets in the low voltage range, don't limit
the corrections. We have seen UVLO where even though the BMS was
calculating SOC quickly it was not lowering the SOC fast enough.
Skip limiting ocv change when battery is near cutoff voltage.

Change-Id: I07747546867dcc90ccf7cb353c4e7a2c2c42520d
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
This commit is contained in:
Abhijeet Dharmapurikar
2013-07-16 20:46:33 -07:00
parent 12faeed4ea
commit fdbd5c763e
1 changed files with 9 additions and 1 deletions
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drivers/power/pm8921-bms.c
+9 -1
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@@ -1970,6 +1970,11 @@ static int adjust_soc(struct pm8921_bms_chip *chip, int soc,
pr_debug("new delta ocv = %d\n", delta_ocv_uv);
}
if (wake_lock_active(&chip->low_voltage_wake_lock)) {
pr_debug("Low Voltage, apply only ibat limited corrections\n");
goto skip_limiting_corrections;
}
if (chip->last_ocv_uv > 3800000)
correction_limit_uv = the_chip->high_ocv_correction_limit_uv;
else
@@ -1986,6 +1991,7 @@ static int adjust_soc(struct pm8921_bms_chip *chip, int soc,
pr_debug("new delta ocv = %d\n", delta_ocv_uv);
}
skip_limiting_corrections:
chip->last_ocv_uv -= delta_ocv_uv;
if (chip->last_ocv_uv >= chip->max_voltage_uv)
@@ -2278,7 +2284,6 @@ static int calculate_state_of_charge(struct pm8921_bms_chip *chip,
int new_calculated_soc;
static int firsttime = 1;
calib_hkadc_check(chip, batt_temp);
calculate_soc_params(chip, raw, batt_temp, chargecycles,
&fcc_uah,
&unusable_charge_uah,
@@ -2426,6 +2431,7 @@ static int recalculate_soc(struct pm8921_bms_chip *chip)
get_batt_temp(chip, &batt_temp);
mutex_lock(&chip->last_ocv_uv_mutex);
calib_hkadc_check(chip, batt_temp);
read_soc_params_raw(chip, &raw, batt_temp);
soc = calculate_state_of_charge(chip, &raw,
@@ -2762,6 +2768,7 @@ void pm8921_bms_charging_began(void)
get_batt_temp(the_chip, &batt_temp);
mutex_lock(&the_chip->last_ocv_uv_mutex);
calib_hkadc_check(the_chip, batt_temp);
read_soc_params_raw(the_chip, &raw, batt_temp);
mutex_unlock(&the_chip->last_ocv_uv_mutex);
@@ -2907,6 +2914,7 @@ void pm8921_bms_charging_end(int is_battery_full)
mutex_lock(&the_chip->last_ocv_uv_mutex);
calib_hkadc_check(the_chip, batt_temp);
read_soc_params_raw(the_chip, &raw, batt_temp);
calculate_cc_uah(the_chip, raw.cc, &bms_end_cc_uah);