Re: [PATCH] arm64: dts: qcom: sc8280xp: use refgen regulator for DSI

[Pengyu Luo]

On Sat, Feb 28, 2026 at 9:44 PM Dmitry Baryshkov
<dmitry.baryshkov@xxxxxxxxxxxxxxxx> wrote:
>
> On Sat, Feb 28, 2026 at 09:38:43PM +0800, Pengyu Luo wrote:
> > On Sat, Feb 28, 2026 at 9:13 PM Dmitry Baryshkov
> > <dmitry.baryshkov@xxxxxxxxxxxxxxxx> wrote:
> > >
> > > On Sat, Feb 28, 2026 at 08:54:30PM +0800, Pengyu Luo wrote:
> > > > Use it for the DSI controllers, since DSI nodes have been added.
> > > >
> > > > Signed-off-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
> > > > ---
> > > > This patch depends on the below series:
> > > > https://lore.kernel.org/linux-arm-msm/20260228101907.18043-1-mitltlatltl@xxxxxxxxx/
> > >
> > > Why was it not squashed into that series? I'd assume that DSI nodes are
> > > incomplete and are working "by luck" without the refgen supplies.
> > >
> >
> > I had completely forgotten about it until I found the patch when I was
> > sorting these old day unverified patches. At that time, I just sent
> > DSI patches. I will put it into DSI patches.
> >
> > Many platforms should work without refgen. Bootloder may have
> > initialized it and be untouched later? Once there was no refgen
> > regulator, my sdm845 phone worked.
>
> If there is no refgen driver, then the bootloader setup will continue to
> work since nobody touches it. If there is a refgen driver, then the
> kernel will shut it off during the bootup procedure.
>

Thanks for explaining this. I saw a similar thing on sm8750, I had to
reboot again and again to turn on the display once.

Best wishes,
Pengyu