linux-kernel - Re: [PATCH 2/3] drm/msm/dsi: support DSC configurations with slice_per

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Message-ID: <9cafccd5-35d4-46c5-aa57-1b0b8ec116e8@oss.qualcomm.com>
Date: Mon, 13 Oct 2025 12:39:41 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: 曹俊杰 <caojunjie650@...il.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Rob Clark
 <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Antonino Maniscalco <antomani103@...il.com>,
        Jonathan Marek <jonathan@...ek.ca>, Eugene Lepshy <fekz115@...il.com>,
        Jun Nie <jun.nie@...aro.org>, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 2/3] drm/msm/dsi: support DSC configurations with
 slice_per_pkt > 1

On 13/10/2025 04:52, 曹俊杰 wrote:
>  >Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com 
> <mailto:dmitry.baryshkov@....qualcomm.com>> 于2025年10月2日周四 10:04写道：
>  >On Wed, Oct 01, 2025 at 09:59:13PM +0800, Junjie Cao wrote:
>  >> From: Jun Nie <jun.nie@...aro.org <mailto:jun.nie@...aro.org>>
>  >>
>  >> Some panels support multiple slice to be sent in a single DSC 
> packet. And
>  >> this feature is a must for specific panels, such as JDI LPM026M648C. 
> Add a
>  >> dsc_slice_per_pkt member into struct mipi_dsi_device and support the
>  >> feature in msm mdss driver.
>  >>
>  >> Co-developed-by: Jonathan Marek <jonathan@...ek.ca 
> <mailto:jonathan@...ek.ca>>
>  >> Signed-off-by: Jonathan Marek <jonathan@...ek.ca 
> <mailto:jonathan@...ek.ca>>
>  >> Signed-off-by: Jun Nie <jun.nie@...aro.org <mailto:jun.nie@...aro.org>>
>  >> Signed-off-by: Junjie Cao <caojunjie650@...il.com 
> <mailto:caojunjie650@...il.com>>
>  >> ---
>  >>  drivers/gpu/drm/msm/dsi/dsi_host.c | 25 ++++++++++---------------
>  >>  include/drm/drm_mipi_dsi.h         |  2 ++
>  >>  2 files changed, 12 insertions(+), 15 deletions(-)
>  >
>  >Please extract the generic part, so that it can be merged through a
>  >generic tree.
>  >
> 
> Sorry, I don't get it.  The generic part, generic tree? Do you mean
> the drm tree? `slice_per_pkt >= 2` is seen on the panels of these
> tablets that are equipped with qcom chips. I don't know if these
> panels are used on other platforms, and if it is necessary to do it
> in drm.

There are two changes here:
- MIPI DSI header change
- msm DSI driver

I've asked to split it to those two commits so that he change for 
drm_mipi_dsi.h is more obvious for reviewers and so that it can be 
merged through a drm-misc tree (or through drm-msm tree provided it gets 
a necessary ack).


-- 
With best wishes
Dmitry