* Sebastian Reichel <sre@xxxxxxxxxx> [191020 20:35]: > Hi Tony, > > On Wed, Oct 16, 2019 at 03:18:17PM -0700, Tony Lindgren wrote: > > There have been some cases of droid4 battery bulging that seem to be > > related to being left connected to the charger for several weeks. > > > > It is suspected that the 4.35V charge voltage configured for the battery > > is too much in the long run, so lets limit the charge voltage to 4.2V. > > It could also be that the batteries are just getting old. > > > > We don't really want to just change the charge voltage to 4.2V as Android > > may have charged the battery to 4.35V as pointed out by Pavel Machek. > > > > To add checks for battery voltage, the driver needs to understand the > > voltage it's charging at, and also needs to better understand it's > > charger state. Right now it only understands connect and disconnect, > > while now we need to know also a connected state but not charging. > > > > So let's add better charger state handling with help of chrgcurr2 interrupt > > for detecting charge full and retry, and add a check for battery voltage > > before we start charging. And then we finally can lower the charge voltage > > to 4.2V. > > > > Note that we've been using the same register values as the Android distros > > on droid4, so it is suspected that the same problem also exists in Android. > > > > Cc: Pavel Machek <pavel@xxxxxx> > > Cc: Rob Herring <robh+dt@xxxxxxxxxx> > > Reported-by: Merlijn Wajer <merlijn@xxxxxxxxxx> > > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> > > --- > > > > If this looks OK, I would appreciate an immutable branch against v5.4-rc1 > > with just this patch in it for merge conflicts with v5.5 dts changes. > > Thanks, I queued this to power-supply's for-next branch using the following > signed immutable branch: > > https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git/tag/?h=psy-cpcap-charge-volt-limit-signed Thanks and sorry about that sparse issue it caused. Regards, Tony
