Re: [PATCH v3] power: supply: cros_charge-control: adopt EC charge state on probe

[Tzung-Bi Shih]

On Fri, Aug 28, 2026 at 09:23:15AM -0500, Matt DeVillier wrote:
> The driver previously always forced AUTO with no charge limits at
> probe, which discarded sustainer thresholds and modes set by firmware
> or firmware setup before the kernel loaded.
> 
> For command versions that support GET (v2+), read the EC state into
> the driver cache instead. Valid sustainer limits are adopted as AUTO
> with those thresholds: while the sustainer is active the EC may report
> IDLE or DISCHARGE as a transient hold/discharge step, which must not
> be exposed as inhibit-charge or force-discharge. Sustainer off
> (-1/-1) still maps to Linux "no limit" (0/100); other invalid limit
> pairs are remapped the same way with a warning and pushed back to
> the EC so the cache stays in sync.
> 
> If GET fails, fall back to the previous defaults and SET them on the
> EC. Command version 1 still cannot report state and keeps forcing a
> well-known configuration.
> 
> Signed-off-by: Matt DeVillier <matt.devillier@xxxxxxxxx>
> Acked-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx>

Reviewed-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>