p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

power: supply: axp288_fuel_gauge: Optimize get_current() 

First check the discharge current, and when that is non 0 use that without
also checking the charge current (which will be 0 then). This makes
get_current() do only 1 i2c read instead of 2 when on battery.

This is esp. important given the pmic i2c bus mutex stuff used on boards
with an axp288 because the SoC's own punit also may access the axp288,
which makes i2c accesses more expensive then normal.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Hans de Goede 2017-12-26 13:59:12 +01:00 committed by Sebastian Reichel
parent 2b5a4b4bf2
commit ceb40831c9
1 changed files with 8 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/power/supply/axp288_fuel_gauge.c
View File

@ -386,24 +386,19 @@ static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
{
int ret, value = 0;
int charge, discharge;
int ret, discharge;
ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &charge);
if (ret < 0)
goto current_read_fail;
/* First check discharge current, so that we do only 1 read on bat. */
ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge);
if (ret < 0)
goto current_read_fail;
return ret;
if (charge > 0)
value = charge;
else if (discharge > 0)
value = -1 * discharge;
if (discharge > 0) {
*cur = -1 * discharge;
return 0;
}
*cur = value;
current_read_fail:
return ret;
return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur);
}
static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)