linux-kernel - Re: [PATCH 0/5] drm/msm/dp: Support multiple DP instances and add sc8180x

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Message-ID: <b9d0a85574230042940c7221dcf48ccf@codeaurora.org>
Date:   Fri, 30 Jul 2021 18:21:37 -0700
From:   abhinavk@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] drm/msm/dp: Support multiple DP instances and add
 sc8180x

Hi Bjorn

On 2021-07-24 21:24, Bjorn Andersson wrote:
> The current implementation supports a single DP instance and the DPU 
> code will
> only match it against INTF_DP instance 0. These patches extends this to 
> allow
> multiple DP instances and support for matching against DP instances 
> beyond 0.
> 
> This is based on v4 of Dmitry's work on multiple DSI interfaces:
> https://lore.kernel.org/linux-arm-msm/20210717124016.316020-1-dmitry.baryshkov@linaro.org/
> 
> With that in place add SC8180x DP and eDP controllers.

Thanks for posting the changes.

I dont have major concerns on the series as such apart from minor 
comments which i will post in a day or two
but I will check and get back if this has been validated on sc7280 
without any concerns.

One question i had is not directly related to this series but related to 
multi-DP in general.
Does audio work fine across both the DPs when both are connected?

The reason I ask this question is that, I dont know how two hdmi-codec 
instances are handled today.
So we will register twice with hdmi-codec so there should be two audio 
streams.

But I am not sure if this works correctly in todays design with 
hdmi-codec.

Any chance you had validated this?

> 
> Bjorn Andersson (5):
>   drm/msm/dp: Remove global g_dp_display variable
>   drm/msm/dp: Modify prototype of encoder based API
>   drm/msm/dp: Support up to 3 DP controllers
>   dt-bindings: msm/dp: Add SC8180x compatibles
>   drm/msm/dp: Add sc8180x DP controllers
> 
>  .../bindings/display/msm/dp-controller.yaml   |   2 +
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   |  17 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c       |  60 +++---
>  .../gpu/drm/msm/disp/msm_disp_snapshot_util.c |   8 +-
>  drivers/gpu/drm/msm/dp/dp_display.c           | 183 +++++++++++++-----
>  drivers/gpu/drm/msm/msm_drv.h                 |  33 ++--
>  6 files changed, 200 insertions(+), 103 deletions(-)