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

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Date:   Sat, 18 Dec 2021 09:17:07 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC/patch 0/2] arm64: boot: dts: qcom: sm8150: enable
 framebuffer for Surface Duo


Hi,

Dmitry Baryshkov <dmitry.baryshkov@...aro.org> writes:
> Hi,
>
> On Fri, 17 Dec 2021 at 15:58, Felipe Balbi <balbi@...nel.org> wrote:
>>
>> 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).
>
> What issues do you have with the DRM_MSM/DPU1 driver? I think it supports 8150.

I haven't tried using it. I'll give it a shot next week.

-- 
balbi