lkml.org 
[lkml]   [2019]   [Feb]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/2] extcon: Intel Cherry Trail Whiskey Cove PMIC and external charger tweaks
Date
At implementation of charging support for Lenovo Yoga Book (Intel Cherry Trail
based with Whiskey Cove PMIC), two pitfalls were found:

- for detection of charger type by PMIC, bit 6 in the CHGRCTRL1 register
should be set in 0 (and set to 1 for Host mode). Pick up its definition
and logic from from Intel code drop[1];

- "#CHARGE ENABLE" signal of external charger (bq25892) in Yoga Book is
connected to one of PMIC outputs controlled by CHGDISCTRL register.
Enable charging at driver initialization. Pick up this from Lenovo's code
drop[2,3].

v2 changes:
- Disable HW control mode of CHGDISCTRL at driver probing and restore
initial state at exit.
- Switch CE output off if OTG host mode is enabled.
- Save and restore CHGRCTRL0 register also.

[1]. https://github.com/01org/ProductionKernelQuilts/uefi/cht-m1stable/patches/0001-power_supply-intel-pmic-ccsm-driver.patch
[2]. https://github.com/jekhor/yogabook-linux-android-kernel/blob/b7aa015ab794b516da7b6cb76e5e2d427e3b8b0c/drivers/power/bq2589x_charger.c#L2257
[3]. https://github.com/01org/ProductionKernelQuilts/uefi/cht-m1stable/patches/EM-Charger-Disable-battery-charging-in-S3-and-enable.patch

Yauhen Kharuzhy (2):
extcon-intel-cht-wc: Make charger detection co-existed with OTG host mode
extcon intel-cht-wc: Enable external charger

drivers/extcon/extcon-intel-cht-wc.c | 129 ++++++++++++++++++++++++++-
1 file changed, 127 insertions(+), 2 deletions(-)

--
2.20.1

\
 
 \ /
  Last update: 2019-02-19 22:25    [W:0.088 / U:26.696 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site