linux-kernel - Re: [PATCH v2 00/38] drm/msm/dp: Add MST support for MSM chipsets

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Message-ID: <20250610083155.cag3de7l727zkcxf@umbar.lan>
Date: Tue, 10 Jun 2025 11:31:55 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongxing Mou <quic_yongmou@...cinc.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v2 00/38] drm/msm/dp: Add MST support for MSM chipsets

On Tue, Jun 10, 2025 at 12:31:40PM +0800, Yongxing Mou wrote:
> 
> 
> On 2025/6/10 0:07, Dmitry Baryshkov wrote:
> > On Mon, Jun 09, 2025 at 08:21:19PM +0800, Yongxing Mou wrote:
> > > Add support for Multi-stream transport for MSM chipsets that allow
> > > a single instance of DP controller to send multiple streams.
> > > 
> > > This series has been validated on sa8775p ride platform using multiple
> > > MST dongles and also daisy chain method on both DP0 and DP1 upto 1080P.
> > > 
> > > With 4x4K monitors, due to lack of layer mixers that combination will not
> > > work but this can be supported as well after some rework on the DPU side.
> > > 
> > > In addition, SST was re-validated with all these changes to ensure there
> > > were no regressions.
> > > 
> > > This patch series was made on top of:
> > > 
> > > [1] : https://patchwork.freedesktop.org/seriedds/142010/ (v2 to fix up HPD)
> > > 
> > > Bindings for the pixel clock for additional stream is available at :
> > > 
> > > [2] : https://patchwork.freedesktop.org/series/142016/
> > > 
> > > Overall, the patch series has been organized in the following way:
> > > 
> > > 1) First set are a couple of fixes made while debugging MST but applicable
> > > to SST as well so go ahead of everything else
> > > 2) Prepare the DP driver to get ready to handle multiple streams. This is the bulk
> > > of the work as current DP driver design had to be adjusted to make this happen.
> > > 3) Finally, new files to handle MST related operations
> > > 
> > > Validation was done on the latest linux-next on top of above changes and
> > > both FB console and weston compositors were validated with these changes.
> > 
> > I went about a halfway through the series. During that I noticed ignored
> > feedback, missing reviewer tags, invalid or strange authorship / SoB
> > tags, overgrown functions, one line wrappers, etc.
> > 
> > Please rebase on top of [3], review the patch series on your own,
> > removing / reworking all the bits that can catch my eye, implement the
> > feedback, ask questions where you don't understand it, etc. After that
> > please post v3. I'll most likely skip the rest of the patches for now.
> > 
> > [3] https://lore.kernel.org/dri-devel/20250518-fd-dp-audio-fixup-v6-0-2f0ec3ec000d@oss.qualcomm.com
> > 
> Hi, Dmitry, thanks for your reviewing very much. Actually i have reviewed
> all the comments on Patch v1. Sorry for not cleaning up everything as
> expected. I will address and discuss all the remaining items in the comments
> for Patch v2, and will follow up with Patch v3 accordingly.

Please discuss the items where they have been raised - either in v1 or
v2 thread.

>