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

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Date: Wed, 10 Jan 2024 12:29:46 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Maxime Ripard <mripard@...nel.org>, Luca Weiss <luca.weiss@...rphone.com>
Cc: 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 1/10/24 12:23, Maxime Ripard wrote:
> 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.

Yes, the panel driver will assert the reset pin to get the hw
into a predictable state, so there will likely be a split
second of black or black+garbage.

Konrad