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power: supply: ab8500_fg: Account for line impedance 

We add the line impedance to the inner resistance determined
from the battery voltage or other means to improve the
capacity estimations.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Linus Walleij 2022-03-01 13:42:54 +01:00 committed by Sebastian Reichel
parent 8dc355748a
commit 1ae4a91c92
1 changed files with 9 additions and 0 deletions
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9
drivers/power/supply/ab8500_fg.c
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@ -213,6 +213,7 @@ struct ab8500_fg {
int init_cnt;
int low_bat_cnt;
int nbr_cceoc_irq_cnt;
u32 line_impedance_uohm;
bool recovery_needed;
bool high_curr_mode;
bool init_capacity;
@ -910,6 +911,9 @@ static int ab8500_fg_battery_resistance(struct ab8500_fg *di, int vbat_uncomp_uv
resistance = bi->factory_internal_resistance_uohm / 1000;
}
/* Compensate for line impedance */
resistance += (di->line_impedance_uohm / 1000);
dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
" fg resistance %d, total: %d (mOhm)\n",
__func__, di->bat_temp, resistance, di->bm->fg_res / 10,
@ -3098,6 +3102,11 @@ static int ab8500_fg_probe(struct platform_device *pdev)
return ret;
}
if (!of_property_read_u32(dev->of_node, "line-impedance-micro-ohms",
&di->line_impedance_uohm))
dev_info(dev, "line impedance: %u uOhm\n",
di->line_impedance_uohm);
psy_cfg.supplied_to = supply_interface;
psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
psy_cfg.drv_data = di;