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Commit de5d42f1 authored by Nicholas Troast's avatar Nicholas Troast Committed by Harry Yang
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qpnp-fg-gen3: improve TTF accuracy towards EOC 



Currently the TTF is inaccurate near 100% SOC. Adjust the tau scale near
100% SOC and adjust the target full battery current to compensate for
the inaccuracy.

Change-Id: I2f6327fab7b71108a928e8c99107522c73c35e07
Signed-off-by: default avatarNicholas Troast <ntroast@codeaurora.org>
parent 9a3a6c36

drivers/power/supply/qcom/qpnp-fg-gen3.c

+9 −5
Original line number Diff line number Diff line
@@ -2285,7 +2285,6 @@ static void batt_avg_work(struct work_struct *work) 
			      msecs_to_jiffies(BATT_AVG_POLL_PERIOD_MS));

}



#define DECI_TAU_SCALE		13

#define HOURS_TO_SECONDS	3600

#define OCV_SLOPE_UV		10869

#define MILLI_UNIT		1000
@@ -2294,7 +2293,7 @@ static int fg_get_time_to_full(struct fg_chip *chip, int *val) 
{

	int rc, ibatt_avg, vbatt_avg, rbatt, msoc, ocv_cc2cv, full_soc,

		act_cap_uah;

	s32 i_cc2cv, soc_cc2cv, ln_val;

	s32 i_cc2cv, soc_cc2cv, ln_val, centi_tau_scale;

	s64 t_predicted_cc = 0, t_predicted_cv = 0;



	if (chip->bp.float_volt_uv <= 0) {
@@ -2417,15 +2416,20 @@ static int fg_get_time_to_full(struct fg_chip *chip, int *val) 


	/* CV estimate starts here */

	if (chip->charge_type >= POWER_SUPPLY_CHARGE_TYPE_TAPER)

		ln_val = ibatt_avg / abs(chip->dt.sys_term_curr_ma);

		ln_val = ibatt_avg / (abs(chip->dt.sys_term_curr_ma) + 200);

	else

		ln_val = i_cc2cv / abs(chip->dt.sys_term_curr_ma);

		ln_val = i_cc2cv / (abs(chip->dt.sys_term_curr_ma) + 200);



	if (msoc < 95)

		centi_tau_scale = 100;

	else

		centi_tau_scale = 20 * (100 - msoc);



	fg_dbg(chip, FG_TTF, "ln_in=%d\n", ln_val);

	rc = fg_lerp(fg_ln_table, ARRAY_SIZE(fg_ln_table), ln_val, &ln_val);

	fg_dbg(chip, FG_TTF, "ln_out=%d\n", ln_val);

	t_predicted_cv = div_s64((s64)act_cap_uah * rbatt, MICRO_UNIT);

	t_predicted_cv = div_s64(t_predicted_cv * DECI_TAU_SCALE, 10);

	t_predicted_cv = div_s64(t_predicted_cv * centi_tau_scale, 100);

	t_predicted_cv = div_s64(t_predicted_cv * ln_val, MILLI_UNIT);

	t_predicted_cv = div_s64(t_predicted_cv * HOURS_TO_SECONDS, MICRO_UNIT);

	fg_dbg(chip, FG_TTF, "t_predicted_cv=%lld\n", t_predicted_cv);