linux-kernel - Re: [PATCH v2 04/11] dt-bindings: display: panel: Describe Samsung SOFEF01-M DDIC

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Message-ID: <aVJpbJEymWWQLK6O@SoMainline.org>
Date: Mon, 29 Dec 2025 12:52:55 +0100
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: Linus Walleij <linusw@...nel.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, 
	Sam Ravnborg <sam@...nborg.org>, David Airlie <airlied@...il.com>, 
	Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Jessica Zhang <jesszhan0024@...il.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Simona Vetter <simona@...ll.ch>, 
	Casey Connolly <casey.connolly@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Simona Vetter <simona.vetter@...ll.ch>, 
	~postmarketos/upstreaming@...ts.sr.ht, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>, Martin Botka <martin.botka@...ainline.org>, 
	Jami Kettunen <jami.kettunen@...ainline.org>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Kuogee Hsieh <quic_khsieh@...cinc.com>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Konrad Dybcio <konrad.dybcio@....qualcomm.com>, 
	Konrad Dybcio <konradybcio@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>
Subject: Re: [PATCH v2 04/11] dt-bindings: display: panel: Describe Samsung
 SOFEF01-M DDIC

On 2025-12-26 18:38:56, Linus Walleij wrote:
> On Fri, Dec 26, 2025 at 2:48 PM Marijn Suijten
> <marijn.suijten@...ainline.org> wrote:
> > On 2025-12-26 14:25:04, Linus Walleij wrote:
> 
> > > They are clearly using the S0FEF01-M display controller.
> >
> > So you're implying or certain that these panel names here are always bundled
> > with exactly the same controller (making the SOFEF01 part "redundant" in the
> > compatible)?
> 
> Yes that's what I suspect.

Do you still want me to drop it from the compatible, but definitely keep it in
the driver filename unless we unify all of the drivers (hopefully in a later
patch)?

> > Also, divergence of the driver commands got significant with the last two panels
> > / three phones, though that might be down to vendor configuration/calibration.
> 
> That's kind of normal. The defaults suffice for a while, then engineers
> want to start poking at different voltages to the display to improve
> and tweak things.

Makes one wonder if the changes are down to the panel used, or vendor tuning
when they started using these panels in their phones.  To note, I think I booted
all these phones on the "original" SOFEF01 driver without problems, before
ultimately implementing all diverging commands because I don't know if they're
defaults, related to color tuning, timings, thermals, manufacturer tolerances or
anything else.

- Marijn