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References: <20211217125757.1193256-1-balbi@kernel.org>
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From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date:   Sat, 18 Dec 2021 03:24:10 +0300
Message-ID: <CAA8EJpoTGyWZRfHnEEMFLVn+JtUxJ7Lv+CL2arxVxU=2vWuHXg@mail.gmail.com>
Subject: Re: [RFC/patch 0/2] arm64: boot: dts: qcom: sm8150: enable
 framebuffer for Surface Duo
To:     Felipe Balbi <balbi@kernel.org>
Cc:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Rob Herring <robh+dt@kernel.org>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Felipe Balbi <felipe.balbi@microsoft.com>
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Hi,

On Fri, 17 Dec 2021 at 15:58, Felipe Balbi <balbi@kernel.org> wrote:
>
> From: Felipe Balbi <felipe.balbi@microsoft.com>
>
> Hi folks,
>
> I'm trying to enable the framebuffer on Microsoft Surface Duo. Looking
> through some internal docs, it came to my attention that the bootloader
> will fill up the framebuffer address and size to a memory node names
> splash_region. Adding the node, I can see the address of the
> framebuffer. Creating the relevant framebuffer device using
> simple-framebuffer, I can't see it working. Tried dd if=/dev/urandom
> of=/dev/fb0 and fb-test. None of which manage to get rid of what's
> already on the screen, put there by the bootloader (platform Logo).
>
> Wondering if any of you have seen a behavior such as this and how did
> you manage to get framebuffer working on SM8150 (I see at least Sony
> Xperia has the node).

What issues do you have with the DRM_MSM/DPU1 driver? I think it supports 8150.

>
> Felipe Balbi (2):
>   arm64: boot: dts: qcom: sm8150: add a label for reserved-memory
>   arm64: boot: dts: qcom: surface duo: add minimal framebuffer
>
>  .../dts/qcom/sm8150-microsoft-surface-duo.dts | 19 +++++++++++++++++++
>  arch/arm64/boot/dts/qcom/sm8150.dtsi          |  2 +-
>  2 files changed, 20 insertions(+), 1 deletion(-)
>
> --
> 2.34.1


-- 
With best wishes
Dmitry