linux-kernel - Re: [PATCH v8 00/15] drm/msm/dpu: Support quad pipe with dual-DSI

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Message-ID: <20250424103608.184295-1-mitltlatltl@gmail.com>
Date: Thu, 24 Apr 2025 18:36:07 +0800
From: Pengyu Luo <mitltlatltl@...il.com>
To: jun.nie@...aro.org
Cc: airlied@...il.com,
	dri-devel@...ts.freedesktop.org,
	freedreno@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	marijn.suijten@...ainline.org,
	mitltlatltl@...il.com,
	quic_abhinavk@...cinc.com,
	quic_jesszhan@...cinc.com,
	robdclark@...il.com,
	sean@...rly.run,
	simona@...ll.ch
Subject: Re: [PATCH v8 00/15] drm/msm/dpu: Support quad pipe with dual-DSI

On Wed, Apr 23, 2025 at 10:50 AM Jun Nie <jun.nie@...aro.org> wrote:
> Pengyu Luo <mitltlatltl@...il.com> 于2025年4月19日周六 02:34写道：
> >
> > On Mon, 03 Mar 2025 23:14:29 +0800 Jun Nie <jun.nie@...aro.org> wrote:
> > > 2 or more SSPPs and dual-DSI interface are need for super wide panel.
> > > And 4 DSC are preferred for power optimal in this case due to width
> > > limitation of SSPP and MDP clock rate constrain. This patch set
> > > extends number of pipes to 4 and revise related mixer blending logic
> > > to support quad pipe. All these changes depends on the virtual plane
> > > feature to split a super wide drm plane horizontally into 2 or more sub
> > > clip. Thus DMA of multiple SSPPs can share the effort of fetching the
> > > whole drm plane.
> > >
> > > The first pipe pair co-work with the first mixer pair to cover the left
> > > half of screen and 2nd pair of pipes and mixers are for the right half
> > > of screen. If a plane is only for the right half of screen, only one
> > > or two of pipes in the 2nd pipe pair are valid, and no SSPP or mixer is
> > > assinged for invalid pipe.
> > >
> > > For those panel that does not require quad-pipe, only 1 or 2 pipes in
> > > the 1st pipe pair will be used. There is no concept of right half of
> > > screen.
> > >
> > > For legacy non virtual plane mode, the first 1 or 2 pipes are used for
> > > the single SSPP and its multi-rect mode.
> > >
> > > To test bonded DSI on SM8650, the 5 patches for active-CTL improvement
> > > are needed:
> > > https://gitlab.freedesktop.org/lumag/msm/-/commits/dpu-4k?ref_type=heads
> > >
> >
> > [...]
> >
> > > base-commit: b44251a8c179381b9f3ed3aa49be04fe1d516903
> >
> > Hi, Jun. The display of my sm8650 device requires 4:4:2(lm, dsc, intf)
> > topology, I want to test this series, these patches can't be applied to
> > the latest linux-next tree, and I can't find the commit id in linux-next
> > or msm-next. Where can I fetch the tree?
> >
> > Best wishes,
> > Pengyu
>
> This is staging patch set. Code clean and formatting is still needed.
>
> https://gitlab.com/jun.nie/linux/-/tree/sm8650/v6.15-quadpipe-staging?ref_type=heads
>

Sory, it seems that this repo is private or internal for linaro, it is
unavailable in my end. Is it possible to set the repo publicly accessible?

BTW, I had tried it with linux-6.14-rc2 as you mentioned in changelog,
my display(PPC100HB1-1 binding with TDDI NT36532E) has the flag
`BL_UPDATE_DELAY_UNTIL_FIRST_FRAME`, if there is no frame, backlight
would refused to turn on. It turns out no frame is sent to display. I
checked encoder in debugfs(/sys/kernel/debug/dri/0/encoder-0/status),
found all frames underrun. Do you have any idea? Thanks in advance.

Best wishes,
Pengyu