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

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Date:   Mon, 25 Apr 2022 13:26:09 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...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_abhinavk@...cinc.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        Kuogee Hsieh <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>,
        "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        quic_vproddut <quic_vproddut@...cinc.com>,
        Aravind Venkateswaran <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

Quoting Sankeerth Billakanti (QUIC) (2022-04-25 02:39:43)
> 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.