This is a note to let you know that I've just added the patch titled
power: supply: max17042_battery: Fix SOC threshold calc w/ no current sense
to the 4.19-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-fix-soc-threshold-calc.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 11dfce7f864ec26ab7f5da16b28caea9d0676d6b
Author: Artur Weber <aweber.kernel@xxxxxxxxx>
Date: Sat Aug 17 12:51:14 2024 +0200
power: supply: max17042_battery: Fix SOC threshold calc w/ no current sense
[ Upstream commit 3a3acf839b2cedf092bdd1ff65b0e9895df1656b ]
Commit 223a3b82834f ("power: supply: max17042_battery: use VFSOC for
capacity when no rsns") made it so that capacity on systems without
current sensing would be read from VFSOC instead of RepSOC. However,
the SOC threshold calculation still read RepSOC to get the SOC
regardless of the current sensing option state.
Fix this by applying the same conditional to determine which register
should be read.
This also seems to be the intended behavior as per the datasheet - SOC
alert config value in MiscCFG on setups without current sensing is set
to a value of 0b11, indicating SOC alerts being generated based on
VFSOC, instead of 0b00 which indicates SOC alerts being generated based
on RepSOC.
This fixes an issue on the Galaxy S3/Midas boards, where the alert
interrupt would be constantly retriggered, causing high CPU usage
on idle (around ~12%-15%).
Fixes: e5f3872d2044 ("max17042: Add support for signalling change in SOC")
Signed-off-by: Artur Weber <aweber.kernel@xxxxxxxxx>
Reviewed-by: Henrik Grimler <henrik@xxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240817-max17042-soc-threshold-fix-v1-1-72b45899c3cc@xxxxxxxxx
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
index 33fbb0fc952b4..6d3ad453e6092 100644
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -848,7 +848,10 @@ static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
/* program interrupt thesholds such that we should
* get interrupt for every 'off' perc change in the soc
*/
- regmap_read(map, MAX17042_RepSOC, &soc);
+ if (chip->pdata->enable_current_sense)
+ regmap_read(map, MAX17042_RepSOC, &soc);
+ else
+ regmap_read(map, MAX17042_VFSOC, &soc);
soc >>= 8;
soc_tr = (soc + off) << 8;
if (off < soc)
