This is a note to let you know that I've just added the patch titled
power: supply: bq27xxx: Ensure power_supply_changed() is called on current sign changes
to the 5.15-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-bq27xxx-ensure-power_supply_changed-is-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 35dfb547bb1a5458f9a9f6093b16890cb19ec9d1
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Sat Apr 15 20:23:37 2023 +0200
power: supply: bq27xxx: Ensure power_supply_changed() is called on current sign changes
[ Upstream commit 939a116142012926e25de0ea6b7e2f8d86a5f1b6 ]
On gauges where the current register is signed, there is no charging
flag in the flags register. So only checking flags will not result
in power_supply_changed() getting called when e.g. a charger is plugged
in and the current sign changes from negative (discharging) to
positive (charging).
This causes userspace's notion of the status to lag until userspace
does a poll.
And when a power_supply_leds.c LED trigger is used to indicate charging
status with a LED, this LED will lag until the capacity percentage
changes, which may take many minutes (because the LED trigger only is
updated on power_supply_changed() calls).
Fix this by calling bq27xxx_battery_current_and_status() on gauges with
a signed current register and checking if the status has changed.
Fixes: 297a533b3e62 ("bq27x00: Cache battery registers")
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 2fca4b9403ff9..e6d67655732aa 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -1836,6 +1836,7 @@ static int bq27xxx_battery_current_and_status(
static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
{
+ union power_supply_propval status = di->last_status;
struct bq27xxx_reg_cache cache = {0, };
bool has_singe_flag = di->opts & BQ27XXX_O_ZERO;
@@ -1860,14 +1861,24 @@ static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
cache.cycle_count = bq27xxx_battery_read_cyct(di);
+ /*
+ * On gauges with signed current reporting the current must be
+ * checked to detect charging <-> discharging status changes.
+ */
+ if (!(di->opts & BQ27XXX_O_ZERO))
+ bq27xxx_battery_current_and_status(di, NULL, &status, &cache);
+
/* We only have to read charge design full once */
if (di->charge_design_full <= 0)
di->charge_design_full = bq27xxx_battery_read_dcap(di);
}
if ((di->cache.capacity != cache.capacity) ||
- (di->cache.flags != cache.flags))
+ (di->cache.flags != cache.flags) ||
+ (di->last_status.intval != status.intval)) {
+ di->last_status.intval = status.intval;
power_supply_changed(di->bat);
+ }
if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
di->cache = cache;
diff --git a/include/linux/power/bq27xxx_battery.h b/include/linux/power/bq27xxx_battery.h
index e3322dad9c85c..7c8d65414a70a 100644
--- a/include/linux/power/bq27xxx_battery.h
+++ b/include/linux/power/bq27xxx_battery.h
@@ -2,6 +2,8 @@
#ifndef __LINUX_BQ27X00_BATTERY_H__
#define __LINUX_BQ27X00_BATTERY_H__
+#include <linux/power_supply.h>
+
enum bq27xxx_chip {
BQ27000 = 1, /* bq27000, bq27200 */
BQ27010, /* bq27010, bq27210 */
@@ -70,6 +72,7 @@ struct bq27xxx_device_info {
int charge_design_full;
bool removed;
unsigned long last_update;
+ union power_supply_propval last_status;
struct delayed_work work;
struct power_supply *bat;
struct list_head list;
