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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Date:   Fri, 24 Jun 2022 18:02:50 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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 6/24/2022 5:46 PM, Dmitry Baryshkov wrote:
> On Sat, 25 Jun 2022 at 03:28, Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
>> 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.from

>> Also, why does the bring up order matters here? What do you gain by
>> bringing up eDP before the DP?
> I should probably rephrase my question to be more clear. How does
> changing the order of DP vs eDP bringup help you 'to fix screen
> corruption'.

it did fix the primary display correction issue if edp go first and i do 
not know the root cause yet.

We are still investigating it.

However I do think currently msm_dp_config sc7280_dp_cfg has issues need 
be addressed.



>