This is a note to let you know that I've just added the patch titled
power: supply: max17042_battery: use VFSOC for capacity when no rsns
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
power-supply-max17042_battery-use-vfsoc-for-capacity-when-no-rsns.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 223a3b82834f036a62aa831f67cbf1f1d644c6e2 Mon Sep 17 00:00:00 2001
From: Henrik Grimler <henrik@xxxxxxxxxx>
Date: Wed, 29 Sep 2021 20:14:17 +0200
Subject: power: supply: max17042_battery: use VFSOC for capacity when no rsns
From: Henrik Grimler <henrik@xxxxxxxxxx>
commit 223a3b82834f036a62aa831f67cbf1f1d644c6e2 upstream.
On Galaxy S3 (i9300/i9305), which has the max17047 fuel gauge and no
current sense resistor (rsns), the RepSOC register does not provide an
accurate state of charge value. The reported value is wrong, and does
not change over time. VFSOC however, which uses the voltage fuel gauge
to determine the state of charge, always shows an accurate value.
For devices without current sense, VFSOC is already used for the
soc-alert (0x0003 is written to MiscCFG register), so with this change
the source of the alert and the PROP_CAPACITY value match.
Fixes: 359ab9f5b154 ("power_supply: Add MAX17042 Fuel Gauge Driver")
Cc: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
Suggested-by: Wolfgang Wiedmeyer <wolfgit@xxxxxxxxxxxx>
Signed-off-by: Henrik Grimler <henrik@xxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/power/supply/max17042_battery.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -246,7 +246,10 @@ static int max17042_get_property(struct
val->intval = data * 625 / 8;
break;
case POWER_SUPPLY_PROP_CAPACITY:
- ret = regmap_read(map, MAX17042_RepSOC, &data);
+ if (chip->pdata->enable_current_sense)
+ ret = regmap_read(map, MAX17042_RepSOC, &data);
+ else
+ ret = regmap_read(map, MAX17042_VFSOC, &data);
if (ret < 0)
return ret;
Patches currently in stable-queue which might be from henrik@xxxxxxxxxx are
queue-4.9/power-supply-max17042_battery-use-vfsoc-for-capacity-when-no-rsns.patch
