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

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Message-ID: <0171746e-1d3c-42e5-9cde-7dcf2708ffc3@quicinc.com>
Date: Wed, 19 Feb 2025 17:56:14 +0800
From: Yongxing Mou <quic_yongmou@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Krzysztof Kozlowski
	<krzk@...nel.org>
CC: 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 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.