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Commit 811a8bd2 authored by Nicholas Troast's avatar Nicholas Troast
Browse files

power: qpnp-fg-gen3: optimize TTF for QNOVO 



QNOVO provides a table of expected charge current settings across the
charge cycle. Use this table to calculate the time it will take to
charge in each step. The sum of these steps is the total time it will
take to fully charge a battery.

Change-Id: I0ed48a2a63886531e761e7ce1d175a600060eaf8
Signed-off-by: default avatarNicholas Troast <ntroast@codeaurora.org>
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent e55198f9

drivers/power/supply/qcom/fg-core.h

+1 −0
Original line number Diff line number Diff line
@@ -233,6 +233,7 @@ enum esr_timer_config { 


enum ttf_mode {

	TTF_MODE_NORMAL = 0,

	TTF_MODE_QNOVO,

};



/* DT parameters for FG device */

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

+44 −1
Original line number Diff line number Diff line
@@ -2822,7 +2822,9 @@ module_param_cb(restart, &fg_restart_ops, &fg_restart, 0644); 
static int fg_get_time_to_full_locked(struct fg_chip *chip, int *val)

{

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

		i_cc2cv, soc_cc2cv, tau, divisor, iterm,

		i_cc2cv, soc_cc2cv, tau, divisor, iterm, ttf_mode,

		i, soc_per_step, msoc_this_step, msoc_next_step,

		ibatt_this_step, t_predicted_this_step,

		t_predicted_cv, t_predicted = 0;



	if (chip->bp.float_volt_uv <= 0) {
@@ -2848,6 +2850,18 @@ static int fg_get_time_to_full_locked(struct fg_chip *chip, int *val) 
		return 0;

	}



	if (is_qnovo_en(chip))

		ttf_mode = TTF_MODE_QNOVO;

	else

		ttf_mode = TTF_MODE_NORMAL;



	/* when switching TTF algorithms the TTF needs to be reset */

	if (chip->ttf.mode != ttf_mode) {

		fg_circ_buf_clr(&chip->ttf.ibatt);

		fg_circ_buf_clr(&chip->ttf.vbatt);

		chip->ttf.mode = ttf_mode;

	}



	/* at least 10 samples are required to produce a stable IBATT */

	if (chip->ttf.ibatt.size < 10) {

		*val = -1;
@@ -2907,6 +2921,12 @@ static int fg_get_time_to_full_locked(struct fg_chip *chip, int *val) 
		i_cc2cv = ibatt_avg * vbatt_avg /

			max(MILLI_UNIT, chip->bp.float_volt_uv / MILLI_UNIT);

		break;

	case TTF_MODE_QNOVO:

		i_cc2cv = min(

			chip->ttf.cc_step.arr[MAX_CC_STEPS - 1] / MILLI_UNIT,

			ibatt_avg * vbatt_avg /

			max(MILLI_UNIT, chip->bp.float_volt_uv / MILLI_UNIT));

		break;

	default:

		pr_err("TTF mode %d is not supported\n", chip->ttf.mode);

		break;
@@ -2931,6 +2951,29 @@ static int fg_get_time_to_full_locked(struct fg_chip *chip, int *val) 
		t_predicted = div_s64((s64)act_cap_mah * (soc_cc2cv - msoc) *

						HOURS_TO_SECONDS, divisor);

		break;

	case TTF_MODE_QNOVO:

		soc_per_step = 100 / MAX_CC_STEPS;

		for (i = msoc / soc_per_step; i < MAX_CC_STEPS - 1; ++i) {

			msoc_next_step = (i + 1) * soc_per_step;

			if (i == msoc / soc_per_step)

				msoc_this_step = msoc;

			else

				msoc_this_step = i * soc_per_step;



			/* scale ibatt by 85% to account for discharge pulses */

			ibatt_this_step = min(

					chip->ttf.cc_step.arr[i] / MILLI_UNIT,

					ibatt_avg) * 85 / 100;

			divisor = max(100, ibatt_this_step * 100);

			t_predicted_this_step = div_s64((s64)act_cap_mah *

					(msoc_next_step - msoc_this_step) *

					HOURS_TO_SECONDS, divisor);

			t_predicted += t_predicted_this_step;

			fg_dbg(chip, FG_TTF, "[%d, %d] ma=%d t=%d\n",

				msoc_this_step, msoc_next_step,

				ibatt_this_step, t_predicted_this_step);

		}

		break;

	default:

		pr_err("TTF mode %d is not supported\n", chip->ttf.mode);

		break;