linux-kernel - Re: [PATCH v2 5/6] arm64: dts: qcom: x1e80100-vivobook-s15: add charge limit nvmem

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Message-ID:
 <PR3P189MB102003218DCCE87EEB69A0E4E3C9A@PR3P189MB1020.EURP189.PROD.OUTLOOK.COM>
Date: Mon, 17 Nov 2025 16:44:41 +0100
From: Maud Spierings <maud_spierings@...mail.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 5/6] arm64: dts: qcom: x1e80100-vivobook-s15: add
 charge limit nvmem

On 11/17/25 16:35, Konrad Dybcio wrote:
> On 11/17/25 3:13 PM, Maud Spierings wrote:
>> Hi Konrad,
>>
>> On 11/17/25 13:59, Konrad Dybcio wrote:
>>> On 11/16/25 11:52 AM, Maud Spierings via B4 Relay wrote:
>>>> From: Maud Spierings <maud_spierings@...mail.com>
>>>>
>>>> Add nvmem cells for getting charge control thresholds if they have
>>>> been set previously.
>>>>
>>>> Signed-off-by: Maud Spierings <maud_spierings@...mail.com>
>>>> ---
>>>
>>> Have you verified that e.g.
>>>
>>> connecting the charger
>>> setting the charge threshold
>>> rebooting to windows
>>> rebooting to windows once more for good measure
>>> rebooting to linux
>>>
>>> still has the settings persist?
>>
>> Hmm I have tried several things but I can't seem to get the values to stick. I the spmi-sdam driver is compiled in, I am not quite sure if I might be missing something.
> 
> Hm, I wonder if Windows/UEFI overwrites these values or whether they're
> used by something else..
> 
> Can you set a threshold in windows and see if Linux can read back that
> data?

the values in /sys/class/power_supply/jada-jada/ are zero when rebooting 
from Windows into Linux after enabling charge limitting in the Asus 
application.

I remember my old vivobook (x86) also forgot its settings each boot, but 
given the nvmem cells that should not be happing here I guess. It is odd 
that there seems to be no collision between Windows and Linux. Maybe the 
Windows mechanism is doing the old trick of writing it in there every boot?

Kind regards,
Maud