linux-kernel - Re: [PATCH v2 09/13] arm64: dts: qcom: sdm845-lg-judyln: Add fb

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Message-ID: <6bc54f43-63c4-4523-9dfd-d74cdaceef58@minlexx.ru>
Date: Thu, 9 Oct 2025 21:02:19 +0300
From: Alexey Minnekhanov <alexeymin@...lexx.ru>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Paul Sajna <sajattack@...tmarketos.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, David Heidelberg <david@...t.cz>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
 Amir Dahan <system64fumo@...tonmail.com>,
 Christopher Brown <crispybrown@...il.com>
Subject: Re: [PATCH v2 09/13] arm64: dts: qcom: sdm845-lg-judyln: Add fb_panel
 dimensions

On 07.10.2025 16:55, Konrad Dybcio wrote:

> Would adding post-init-providers = <&real_panel> help?
> 
> Konrad

I suppose it should, as means to break devlink dependency, but I
personally haven't tried it yet.

It's easier to just have "msm" and "panel-*" modules in initramfs and
leave simpledrm node be with invalid scaling, because it doesn't live
long enough to display anything (maybe a fraction of a second) due to
being quickly replaced by msm drm framebuffer emulation.

Framebuffer-only display with proper scaling is only needed for devices
without display/panel drivers, perhaps temporarily during early porting
stage, so this all is minor issue.

Still would be nice to have a proper solution for this of course.

-- 
Regards,
Alexey Minnekhanov