linux-kernel - Re: [PATCH v2 4/5] dt-bindings: display/msm: dsi-controller-main: Document dual panel property

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Message-ID: <CABymUCMn+USbm21agBZbe=JmV-FzLdVD4s0xgg0CPU=M9jvC9w@mail.gmail.com>
Date: Thu, 20 Feb 2025 23:40:03 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Krishna Manikandan <quic_mkrishn@...cinc.com>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/5] dt-bindings: display/msm: dsi-controller-main:
 Document dual panel property

Dmitry Baryshkov <dmitry.baryshkov@...aro.org> 于2025年2月20日周四 18:33写道：
>
> On Thu, Feb 20, 2025 at 06:07:55PM +0800, Jun Nie wrote:
> > The DSI interface can be connected to a panel that has a dual DSI channel,
> > or to two separate panels, each equipped with a single DSI channel. To
> > prevent the DSC configuration for the dual panel setup from disrupting the
> > current configuration of a single panel with a dual DSI channel, add a dual
> > panel property to support the use of two panels.
>
> Please use the terms from the standard. The "channel" is mostly used for
> the "Virtual Channel" or the "logical channel".

OK, will use DSI link for all later description.
>
> Also I don't follow how DSC configuration for a dual panel setup can
> disrupt current (?) configuration of a single panel.

For the disruption, Marijn mentioned it in the last post.
https://gitlab.freedesktop.org/drm/msm/-/issues/41#note_2411541

>
> >
> > Signed-off-by: Jun Nie <jun.nie@...aro.org>
> > ---
> >  .../devicetree/bindings/display/msm/dsi-controller-main.yaml      | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml b/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
> > index ffbd1dc9470e2091b477b0c88392d81802119f48..e3f2eabde27609a66d6d81fafcb14e1bc014613c 100644
> > --- a/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
> > +++ b/Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml
> > @@ -88,9 +88,15 @@ properties:
> >    qcom,dual-dsi-mode:
> >      type: boolean
> >      description: |
> > -      Indicates if the DSI controller is driving a panel which needs
> > +      Indicates if the DSI controller is driving display device which needs
>
> Unrelated change
>
> >        2 DSI links.
> >
> > +  qcom,dual-panel:
> > +    type: boolean
> > +    description: |
> > +      Indicates if the DSI controller is driving display device that composed
> > +      with 2 independent panels and needs 2 DSI links.
>
> How is tht different from qcom,dual-dsi-mode?

Your questioning is right. The dual panel case is a subset of
dual-dsi-mode, not parallel with
dual-dsi-mode. It is single panel with 2 DSI link by default, and 2
panel with 1 DSI link in
each panel if property dual-panel is present.
>
> > +
> >    qcom,master-dsi:
> >      type: boolean
> >      description: |
> >
> > --
> > 2.34.1
> >
>
> --
> With best wishes
> Dmitry