linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sm7225-fairphone-fp4: Enable display and GPU

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Message-ID: <2zkiop7xg7w4vkpjpol25qna5wwbq4ja5o6iwuqh25m34k6mgd@aemrbzqgx2oe>
Date: Wed, 10 Jan 2024 12:23:21 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Sam Ravnborg <sam@...nborg.org>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, ~postmarketos/upstreaming@...ts.sr.ht, 
	phone-devel@...r.kernel.org, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sm7225-fairphone-fp4: Enable
 display and GPU

On Wed, Jan 10, 2024 at 12:00:23PM +0100, Luca Weiss wrote:
> On Wed Jan 10, 2024 at 11:58 AM CET, Konrad Dybcio wrote:
> >
> >
> > On 1/5/24 15:29, Luca Weiss wrote:
> > > Add the description for the display panel found on this phone and remove
> > > the simple-framebuffer that was in place until now
> >
> > Why? They should be able to coexist with a smooth-ish handoff
> 
> Does that work upstream? I'm aware that downstream can do this but
> thought this was still missing upstream.

It depends what you call smooth-ish I guess, but KMS handles the
handover just fine. You're likely to get a flicker during the transition
though.

Either way, the DT isn't the right place to choose, you should enable
both, and the distro will choose its policy through configuration.

Maxime

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