linux-kernel - [RFC/patch 0/2] arm64: boot: dts: qcom: sm8150: enable framebuffer for Surface Duo

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Date:   Fri, 17 Dec 2021 14:57:55 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...rosoft.com>
Subject: [RFC/patch 0/2] arm64: boot: dts: qcom: sm8150: enable framebuffer for Surface Duo

From: Felipe Balbi <felipe.balbi@...rosoft.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).

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(-)

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2.34.1