linux-kernel - RE: [PATCH v9 2/4] drm/msm/dp: Support only IRQ

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Date:   Mon, 25 Apr 2022 13:27:05 -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 2/4] drm/msm/dp: Support only IRQ_HPD and REPLUG
 interrupts for eDP

Quoting Sankeerth Billakanti (QUIC) (2022-04-24 19:55:29)
> >Quoting Sankeerth Billakanti (2022-04-22 02:11:04)
> >
> >>  int dp_catalog_ctrl_get_interrupt(struct dp_catalog *dp_catalog) diff
> >> --git a/drivers/gpu/drm/msm/dp/dp_display.c
> >> b/drivers/gpu/drm/msm/dp/dp_display.c
> >> index 055681a..dea4de9 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> >> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> >> @@ -1096,6 +1097,13 @@ static void dp_display_config_hpd(struct
> >dp_display_private *dp)
> >>         dp_display_host_init(dp);
> >>         dp_catalog_ctrl_hpd_config(dp->catalog);
> >>
> >> +       /* Enable plug and unplug interrupts only for external DisplayPort */
> >> +       if (!dp->dp_display.is_edp)
> >> +               dp_catalog_hpd_config_intr(dp->catalog,
> >> +                               DP_DP_HPD_PLUG_INT_MASK |
> >> +                               DP_DP_HPD_UNPLUG_INT_MASK,
> >> +                               true);
> >> +
> >
> >It seems like only the plug and unplug is enabled for DP here. Is replug
> >enabled for eDP when it shouldn't be?
> >
>
> By default, all the interrupts are masked. This function is not executed for eDP
> anymore because the host_init, phy_init and enable_irq are all done from
> modeset_init for eDP with aux_bus. So, none of the eDP hpd interrupts are
> enabled or unmasked before pre-enable.
>
> The replug interrupt is unmasked for DP and eDP from the dp_hpd_plug_handle()
> and masked from dp_hpd_unplug_handle().

Why is replug enabled for eDP?