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

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Date:   Tue, 31 Jan 2023 13:06:12 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>
Cc:     Amit Pundir <amit.pundir@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory
 region as reserved

On Tue, 31 Jan 2023 at 12:54, Bryan O'Donoghue
<bryan.odonoghue@...aro.org> wrote:
>
> On 24/01/2023 18:28, Amit Pundir wrote:
> > Put cont splash memory region under the reserved-memory
> > as confirmed by the downstream code as well.
> >
> > Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> > ---
> >   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 f41c6d600ea8..2ae59432cbda 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> > @@ -100,6 +100,14 @@ 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;
> > +             };
> > +     };
> > +
> >       lt9611_1v8: lt9611-vdd18-regulator {
> >               compatible = "regulator-fixed";
> >               regulator-name = "LT9611_1V8";
>
> Doesn't this mean we loose 0x2400000 of DRAM for all rb3 platforms
> though ? About what 37 megabytes.. ?

I think this memory is further used for display memory allocation. So
we are not loosing it, but dedicating it to the framebuffer memory.


-- 
With best wishes
Dmitry