CONTROL1 bits can be modified from multiple tasks:
- charger_enable_otg_power (charger or pd task)
- charger_discharge_on_ac (host command or console)
- charger_enable/disable_psys (chipset task)
- print_amon_bmon (console)
Since we use I2C read, modify, then I2C write access pattern,
there is a small chance of races between these accesses:
let's protect them with a mutex.
Also, the current code sometimes uses charger_get_option/set_option
instead of manipulating CONTROL0 directly: fix those to regain
a bit of the extra code size caused by the mutex.
BRANCH=none
BUG=b:67029560
TEST=Flash lux, battery charges, amon works fine.
TEST=Flash elm, battery charges.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Change-Id: If375d9922db53dd582582bfa44d6218fe0b416ec
Reviewed-on: https://chromium-review.googlesource.com/848486
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
f14879eae1