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* [PATCH v2 0/2] extcon: Intel Cherry Trail Whiskey Cove PMIC and external charger tweaks
@ 2019-02-19 21:24 Yauhen Kharuzhy
  2019-02-19 21:24 ` [PATCH v2 1/2] extcon-intel-cht-wc: Make charger detection co-existed with OTG host mode Yauhen Kharuzhy
  2019-02-19 21:24 ` [PATCH v2 2/2] extcon intel-cht-wc: Enable external charger Yauhen Kharuzhy
  0 siblings, 2 replies; 9+ messages in thread
From: Yauhen Kharuzhy @ 2019-02-19 21:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: MyungJoo Ham, Chanwoo Choi, Hans de Goede, Andy Shevchenko,
	Yauhen Kharuzhy

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


^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2019-02-22  9:18 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-02-19 21:24 [PATCH v2 0/2] extcon: Intel Cherry Trail Whiskey Cove PMIC and external charger tweaks Yauhen Kharuzhy
2019-02-19 21:24 ` [PATCH v2 1/2] extcon-intel-cht-wc: Make charger detection co-existed with OTG host mode Yauhen Kharuzhy
2019-02-20 12:42   ` Andy Shevchenko
2019-02-20 20:46     ` Yauhen Kharuzhy
2019-02-19 21:24 ` [PATCH v2 2/2] extcon intel-cht-wc: Enable external charger Yauhen Kharuzhy
2019-02-20 13:08   ` Andy Shevchenko
2019-02-20 15:53   ` Hans de Goede
2019-02-20 21:24     ` Yauhen Kharuzhy
2019-02-22  9:18       ` Hans de Goede

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