linux-kernel - Re: [PATCH v2 05/16] dt-bindings: display/msm: dp-controller: Add SM8750

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Message-ID: <4e82404a-0ea5-4641-829a-bba666edd352@quicinc.com>
Date: Mon, 24 Feb 2025 10:59:06 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>
CC: Rob Clark <robdclark@...il.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>,
        Jonathan Marek
	<jonathan@...ek.ca>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Neil Armstrong
	<neil.armstrong@...aro.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>,
        "Srini
 Kandagatla" <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH v2 05/16] dt-bindings: display/msm: dp-controller: Add
 SM8750



On 2/19/2025 9:08 AM, Dmitry Baryshkov wrote:
> On Wed, Feb 19, 2025 at 06:02:20PM +0100, Krzysztof Kozlowski wrote:
>> On 17/02/2025 19:58, Dmitry Baryshkov wrote:
>>> On Mon, Feb 17, 2025 at 05:41:26PM +0100, Krzysztof Kozlowski wrote:
>>>> Add DisplayPort controller for Qualcomm SM8750 SoC which so far looks
>>>> fully compatible with earlier SM8650 variant.
>>>
>>> As that became a question for QCS8300, does SM8750 also support exactly
>>> two MST streams?
>>
>> v1.5 of DP (starting from SA8775p , then SM8650 and SM8750) support 4x
>> MST for DPTX0 and 2x MST for DPTX1.
>>
>> The DP in SM8650 and SM8750 are identical, according to datasheet (v1.5.1).
> 
> Hmm. This also means that QCS8300 is compatible with SM8650. I'll let
> Abhinav comment here.
> 

DP version by itself is not a good measure of whether the controller can 
support 4 streams or not.

Firstly, sm8650/sm8750 do not have a DPTX1 so we are only discussing 
about DP TX0.

Coming to the QCS8300 Vs sm8650/sm8750, even though the DP controller 
version is the same, there is no HW support for more than 2 streams on 
sm8650/sm8750 because there are no INTF blocks to drive 4 streams.

On sm8650/sm8750, only INTF_0 and INTF_3 can be used for DP. Hence 2 
streams.

Whereas on Monaco, we have INTF_0, INTF_3, INTF_6 and INTF_7 capable of 
driving DP. Hence 4 streams.

Let me know if there are more questions.

Thanks

Abhinav