linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory region as reserved

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Date:   Fri, 16 Jun 2023 12:22:43 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sdm845-db845c: Mark cont splash
 memory region as reserved

On Thu, 15 Jun 2023 at 22:56, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> On 15.06.2023 16:27, Amit Pundir wrote:
> > Adding a reserved memory region for the framebuffer memory
> > (the splash memory region set up by the bootloader).
> >
> > Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> > ---
> > v2: Updated commit message.
> >
> > There was some dicussion on v1 but it didn't go anywhere,
> > https://lore.kernel.org/linux-kernel/20230124182857.1524912-1-amit.pundir@linaro.org/T/#u.
> > The general consensus is that this memory should be freed and be
> > made resuable but that (releasing this piece of memory) has been
> > tried before and it is not trivial to return the reserved memory
> > node to the system RAM pool in this case.
> >
> >  arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > index e14fe9bbb386..10a06ee8e262 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > @@ -101,6 +101,14 @@ hdmi_con: endpoint {
> >               };
> >       };
> >
> > +     reserved-memory {
> > +             /* Cont splash region set up by the bootloader */
> > +             cont_splash_mem: framebuffer@...00000 {
> > +                     reg = <0x0 0x9d400000 0x0 0x2400000>;
> > +                     no-map;
> > +             };
> > +     };
> &mdss {
>         memory-region = <&cont_splash_mem>;
> };
>
> ?

Thank you. Updated in v3.

>
> Konrad
> > +
> >       lt9611_1v8: lt9611-vdd18-regulator {
> >               compatible = "regulator-fixed";
> >               regulator-name = "LT9611_1V8";