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
