On Sat 2020-04-11 14:09:02, Greg Kroah-Hartman wrote: > From: Hans de Goede <hdegoede@xxxxxxxxxx> > > commit 9c80662a74cd2a5d1113f5c69d027face963a556 upstream. > > Some HP Pavilion x2 10 models use an AXP288 for charging and fuel-gauge. > We use a native power_supply / PMIC driver in this case, because on most > models with an AXP288 the ACPI AC / Battery code is either completely > missing or relies on custom / proprietary ACPI OpRegions which Linux > does not implement. > > The native drivers mostly work fine, but there are 2 problems: > > 1. These model uses a Type-C connector for charging which the AXP288 does > not support. As long as a Type-A charger (which uses the USB data pins for > charger type detection) is used everything is fine. But if a Type-C > charger is used (such as the charger shipped with the device) then the > charger is not recognized. > > So we end up slowly discharging the device even though a charger is > connected, because we are limiting the current from the charger to 500mA. > To make things worse this happens with the device's official charger. > > Looking at the ACPI tables HP has "solved" the problem of the AXP288 not > being able to recognize Type-C chargers by simply always programming the > input-current-limit at 3000mA and relying on a Vhold setting of 4.7V > (normally 4.4V) to limit the current intake if the charger cannot handle > this. Hmm.. Drawing 3A from port designed for .5A... is not that a bit dangerous? It is certainly against the specs. I believe it will work okay 90% of time, but maybe something overheats or some fuse trips in the remaining cases. I believe I've seen fuse triping on USB port of my home router.. Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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