Re: [PATCH] arm64: dts: qcom: sdm845-oneplus: add panel rails to simplefb

[Sam Day]

Hello Konrad,

On Saturday, 20 June 2026 at 1:11 AM, Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx> wrote:

> On 6/16/26 7:27 AM, Sam Day via B4 Relay wrote:
> > From: Sam Day <me@xxxxxxxxxxx>
> >
> > These regulators are marked regulator-boot-on, but that doesn't
> > guarantee they'll stay alive as long as the simplefb does. Adding the
> > explicit supplies ensures that booting with MDSS disabled doesn't
> > switch the panel off 30 seconds after boot.
> 
> Why would you boot without MDSS if you want the panel to function?

For my particular use-case [1] I'm trying to avoid taking over the display
hardware entirely, and use simplefb until kexecing into the real kernel. In
this case the user might halt in a pre-boot menu UI for a while.

I can also imagine this being similarly useful for "recovery kernel" use-cases
where again, it may not be desirable to assume control of MDSS/MDP/DSI blocks.

[1]: https://github.com/samcday/pocketboot

Regards,
-Sam

> 
> Konrad
>