Re: [PATCH v2 04/20] power: supply: bq25890: Reduce reported CONSTANT_CHARGE_CURRENT_MAX for low temperatures

Hans de Goede
2021-11-16T09:43:25Z

Hi,

On 11/14/21 18:03, Hans de Goede wrote:
> From: Yauhen Kharuzhy <jekhor@gmail.com>
>
> Take into account possible current reduction due to low-temperature when
> reading POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX. As described in
> the datasheet in cool (0-20° Celcius) conditions the current limit is
> decreased to 20% or 50% of ICHG field value depended on JEITA_ISET field.
>
> Also add NTC_FAULT field value to the debug message in
> bq25890_get_chip_state().
>
> Changed by Hans de Goede:
> - Fix reading F_CHG_FAULT instead of F_NTC_FIELD for state->ntc_fault
> - Only read JEITA_ISET field if necessary
> - Tweak commit message a bit
>
> Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> drivers/power/supply/bq25890_charger.c | 33 +++++++++++++++++++++++---
> 1 file changed, 30 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
> index b208cc2193b8..617a653221ab 100644
> --- a/drivers/power/supply/bq25890_charger.c
> +++ b/drivers/power/supply/bq25890_charger.c
> @@ -94,6 +94,7 @@ struct bq25890_state {
> u8 vsys_status;
> u8 boost_fault;
> u8 bat_fault;
> + u8 ntc_fault;
> };
>
> struct bq25890_device {
> @@ -383,6 +384,14 @@ enum bq25890_chrg_fault {
> CHRG_FAULT_TIMER_EXPIRED,
> };
>
> +enum bq25890_ntc_fault {
> + NTC_FAULT_NORMAL = 0,
> + NTC_FAULT_WARM = 2,
> + NTC_FAULT_COOL = 3,
> + NTC_FAULT_COLD = 5,
> + NTC_FAULT_HOT = 6,
> +};
> +
> static bool bq25890_is_adc_property(enum power_supply_property psp)
> {
> switch (psp) {
> @@ -474,6 +483,18 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
>
> case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
> +
> + /* When temperature is too low, charge current is decreased */
> + if (bq->state.ntc_fault == NTC_FAULT_COOL) {
> + ret = bq25890_field_read(bq, F_JEITA_ISET);
> + if (ret < 0)
> + return ret;
> +
> + if (ret)
> + val->intval /= 5;
> + else
> + val->intval /= 2;
> + }
> break;
>
> case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
> @@ -486,6 +507,10 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
> if (ret < 0)
> return ret;
>
> + ret = bq25890_field_read(bq, F_JEITA_VSET);
> + if (ret < 0)
> + return ret;
> +
> /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
> val->intval = 2304000 + ret * 20000;
> break;

Ugh, this should not be here. I guess this is a leftover from an attempt to
also apply temperature correction to the POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE
prop.

I'll drop this for v3 of the series. Note I'll first wait a week or so for
other feedback.

Regards,

Hans

> @@ -549,7 +574,8 @@ static int bq25890_get_chip_state(struct bq25890_device *bq,
> {F_VSYS_STAT, &state->vsys_status},
> {F_BOOST_FAULT, &state->boost_fault},
> {F_BAT_FAULT, &state->bat_fault},
> - {F_CHG_FAULT, &state->chrg_fault}
> + {F_CHG_FAULT, &state->chrg_fault},
> + {F_NTC_FAULT, &state->ntc_fault}
> };
>
> for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
> @@ -560,9 +586,10 @@ static int bq25890_get_chip_state(struct bq25890_device *bq,
> *state_fields[i].data = ret;
> }
>
> - dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
> + dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT/NTC=%d/%d/%d/%d\n",
> state->chrg_status, state->online, state->vsys_status,
> - state->chrg_fault, state->boost_fault, state->bat_fault);
> + state->chrg_fault, state->boost_fault, state->bat_fault,
> + state->ntc_fault);
>
> return 0;
> }
>