The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 0cf48167b87e388fa1268c9fe6d2443ae7f43d8a Mon Sep 17 00:00:00 2001
From: Sebastian Krzyszkowiak sebastian.krzyszkowiak@puri.sm Date: Tue, 14 Sep 2021 14:18:05 +0200 Subject: [PATCH] power: supply: max17042_battery: Clear status bits in interrupt handler
The gauge requires us to clear the status bits manually for some alerts to be properly dismissed. Previously the IRQ was configured to react only on falling edge, which wasn't technically correct (the ALRT line is active low), but it had a happy side-effect of preventing interrupt storms on uncleared alerts from happening.
Fixes: 7fbf6b731bca ("power: supply: max17042: Do not enforce (incorrect) interrupt trigger type") Cc: stable@vger.kernel.org Signed-off-by: Sebastian Krzyszkowiak sebastian.krzyszkowiak@puri.sm Reviewed-by: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Signed-off-by: Sebastian Reichel sebastian.reichel@collabora.com
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c index 32f331480487..2eb61856f3e4 100644 --- a/drivers/power/supply/max17042_battery.c +++ b/drivers/power/supply/max17042_battery.c @@ -879,6 +879,10 @@ static irqreturn_t max17042_thread_handler(int id, void *dev) max17042_set_soc_threshold(chip, 1); }
+ /* we implicitly handle all alerts via power_supply_changed */ + regmap_clear_bits(chip->regmap, MAX17042_STATUS, + 0xFFFF & ~(STATUS_POR_BIT | STATUS_BST_BIT)); + power_supply_changed(chip->battery); return IRQ_HANDLED; }