linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-xiaomi-beryllium-tianma: Add reserved memory region

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Message-ID: <CAMi1Hd2F0DZVU1dpju1C0MGfb59qnEyi3Lz3qY+sT=hFbycfZw@mail.gmail.com>
Date:   Fri, 27 Jan 2023 11:56:36 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Joel Selvaraj <joelselvaraj.oss@...il.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.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>,
        phone-devel <phone-devel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-xiaomi-beryllium-tianma: Add
 reserved memory region

On Thu, 26 Jan 2023 at 11:45, Joel Selvaraj <joelselvaraj.oss@...il.com> wrote:
>
> Hi Amit Pundir,
>
> I have a Poco F1 (EBBG) variant and I can confirm that the framebuffer
> address is same for the EBBG variant too.
>
> I did a quick check by running the following command based on this link[1]:
>
> xiber:~$ strings /dev/disk/by-partlabel/xbl_a | grep "Display Reserved"
>
> 0x9D400000, 0x02400000, "Display Reserved",  AddMem, MEM_RES,
> SYS_MEM_CAP, Reserv, WRITE_BACK_XN
>
> So I think it's safe to move this to sdm845-xiaomi-beryllium-common.dtsi

ACK. Sending v2 shortly.

>
> Regards,
> Joel Selvaraj
>
> [1]
> https://wiki.postmarketos.org/wiki/SDM845_Mainlining#Find_the_framebuffer_address
>
>
>
>
> On 24/01/23 12:32, Amit Pundir wrote:
> > Put cont splash memory region under the reserved-memory as
> > confirmed by the downstream code for Tianma variant as well.
> >
> > Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> > ---
> > This change should probably go in sdm845-xiaomi-beryllium-common but
> > I don't have EBBG variant's downstream code nor the device to test.
> >
> >  .../boot/dts/qcom/sdm845-xiaomi-beryllium-tianma.dts      | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium-tianma.dts b/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium-tianma.dts
> > index 8e176111e599..47cbf725b0e3 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium-tianma.dts
> > +++ b/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium-tianma.dts
> > @@ -7,6 +7,14 @@
> >  / {
> >       model = "Xiaomi Pocophone F1 (Tianma)";
> >       compatible = "xiaomi,beryllium", "qcom,sdm845";
> > +
> > +     reserved-memory {
> > +             /* Cont splash region set up by the bootloader */
> > +             cont_splash_mem: framebuffer@...00000 {
> > +                     reg = <0x0 0x9d400000 0x0 0x2400000>;
> > +                     no-map;
> > +             };
> > +     };
> >  };
> >
> >  &display_panel {