linux-kernel - Re: [PATCH v1 2/3] drm/msm/dp: decoupling dp->id out of dp controller_id at scxxxx_dp

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Message-ID: <CAA8EJpqB2KPyvFehK9WRGgiVnqvD24cz5BcHsw8a5PQ2Vs1oKA@mail.gmail.com>
Date:   Sat, 25 Jun 2022 03:28:26 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dianders@...omium.org, dri-devel@...ts.freedesktop.org,
        robdclark@...il.com, sean@...rly.run, vkoul@...nel.org,
        quic_aravindh@...cinc.com, quic_sbillaka@...cinc.com,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] drm/msm/dp: decoupling dp->id out of dp
 controller_id at scxxxx_dp_cfg table

On Sat, 25 Jun 2022 at 03:23, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
> On 6/24/2022 5:21 PM, Dmitry Baryshkov wrote:
> > On Sat, 25 Jun 2022 at 03:19, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
> >> How can I have eDP call dpu_encoder_init() before DP calls with
> >> _dpu_kms_initialize_displayport()?
> > Why do you want to do it? They are two different encoders.
>
> eDP is primary display which in normal case should be bring up first if
> DP is also presented.

I do not like the concept of primary display. It is the user, who must
decide which display is primary to him. I have seen people using just
external monitors and ignoring built-in eDP completely.

Also, why does the bring up order matters here? What do you gain by
bringing up eDP before the DP?

>
> We want eDP encoder  help functions be executed before DP.

Why?

-- 
With best wishes
Dmitry