linux-kernel - RE: [PATCH v9 1/4] drm/msm/dp: Add eDP support via aux

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Date:   Tue, 26 Apr 2022 01:58:58 +0000
From:   "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>
To:     "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "robdclark@...il.com" <robdclark@...il.com>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        quic_kalyant <quic_kalyant@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "sean@...rly.run" <sean@...rly.run>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        quic_vproddut <quic_vproddut@...cinc.com>,
        "Aravind Venkateswaran (QUIC)" <quic_aravindh@...cinc.com>,
        "steev@...i.org" <steev@...i.org>
Subject: RE: [PATCH v9 1/4] drm/msm/dp: Add eDP support via aux_bus

Hi Stephen,

>>>> Quoting Sankeerth Billakanti (2022-04-22 02:11:03)
>>>>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
>>>>> b/drivers/gpu/drm/msm/dp/dp_display.c
>>>>> index d7a19d6..055681a 100644
>>>>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>>>>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>>>>
>>>> Some nitpicks
>>>>
>>>> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
>>>>
>>>>> @@ -1508,7 +1509,8 @@ void msm_dp_irq_postinstall(struct msm_dp
>>>>> *dp_display)
>>>>>
>>>>>          dp_hpd_event_setup(dp);
>>>>>
>>>>> -       dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
>>>>> +       if (!dp_display->is_edp)
>>>>> +               dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
>>>>
>>>> Did it turn out that in fact DP isn't ready still to setup even
>>>> after delaying the irq?
>>>>
>>>
>>> The host_init, config_hpd, phy_init and enable_irq are happening in
>modeset_init already for eDP.
>>> So, I am not scheduling the EV_HPD_INIT_SETUP event for eDP. I am not
>modifying the delay for DP.
>>
>> Cool. That didn't answer my question though. Why does DP still need
>> the delay? I thought recent changes made it unnecessary.
>
>I'd say that if it is not necessary, it should be changed in the separate commit.
>The question is valid nevertheless.
>

Yes, that is right. The delay is unnecessary with the recent changes.
Like Dmitry rightly suggested, we will remove the delay in a separate commit.

>
>--
>With best wishes
>Dmitry