linux-kernel - Re: [PATCH 1/4] dt-bindings: display/msm: Redocument the dp-controller for QCS8300

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Message-ID: <yjt6wwzrufigpuotsspoolnnonkueyb6evk3gtrtb6zpceuinu@em3ry7pufabw>
Date: Wed, 19 Feb 2025 14:56:09 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...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>, Kuogee Hsieh <quic_khsieh@...cinc.com>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: display/msm: Redocument the
 dp-controller for QCS8300

On Wed, Feb 19, 2025 at 05:56:14PM +0800, Yongxing Mou wrote:
> 
> 
> On 2025/2/12 20:26, Dmitry Baryshkov wrote:
> > On Wed, 12 Feb 2025 at 12:54, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> > > 
> > > On 12/02/2025 11:41, Dmitry Baryshkov wrote:
> > > > On Wed, Feb 12, 2025 at 03:12:24PM +0800, Yongxing Mou wrote:
> > > > > We need to enable mst for qcs8300, dp0 controller will support 2 streams
> > > > > output. So not reuse sm8650 dp controller driver and will add a new driver
> > > > > patch for qcs8300 mst feature. Modify the corresponding dt-bingding file
> > > > > to compatible with the qcs8300-dp.
> > > > 
> > > > NAK for a different reason: QCS8300 is still compatible with SM8650.
> > > > Enable features instead of randomly reshuffle compats. In this case,
> > > > enable MST for both architectures.
> > > > 
> > > So the original patch was probably correct...
> > 
> > I have no idea. I'd let Yongxing Mou to comment on this. It would be
> > nice  instead of getting a lengthy explanation of obvious items to get
> > an answer to an actual question: is QCS8300 compatible with SM8650 or
> > not. In other words whether they can support the same number of MST
> > streams on each controller or not.
> > 
> Hi, in hardware, the SM8650's DP controller supports 2 INTFs, while the
> QCS8300's DP0 controller supports 4 INTFs.In sst mode, only one INTF will be
> used, they are same, but for MST, sm8650 supports 2 streams while qcs8300
> support 4 streams. Thanks.

So, they are not compatible. Please use separate compatible.

-- 
With best wishes
Dmitry