linux-kernel - Re: [PATCH v6 3/8] drm/msm/dp: Support only IRQ

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Date:   Thu, 31 Mar 2022 16:22:46 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Clark <robdclark@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        quic_kalyant <quic_kalyant@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        quic_vproddut <quic_vproddut@...cinc.com>,
        quic_aravindh@...cinc.com
Subject: Re: [PATCH v6 3/8] drm/msm/dp: Support only IRQ_HPD and REPLUG
 interrupts for eDP

Hi,

On Wed, Mar 30, 2022 at 9:03 AM Sankeerth Billakanti
<quic_sbillaka@...cinc.com> wrote:
>
> @@ -1374,6 +1382,12 @@ static int dp_pm_resume(struct device *dev)
>         dp_catalog_ctrl_hpd_config(dp->catalog);
>
>
> +       if (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_DisplayPort)
> +               dp_catalog_hpd_config_intr(dp->catalog,
> +                               DP_DP_HPD_PLUG_INT_MASK |
> +                               DP_DP_HPD_UNPLUG_INT_MASK,
> +                               true);
> +

nit: why are there two blank lines above?


> @@ -1639,6 +1653,9 @@ void dp_bridge_enable(struct drm_bridge *drm_bridge)
>                 return;
>         }
>
> +       if (dp->connector_type == DRM_MODE_CONNECTOR_eDP)
> +               dp_hpd_plug_handle(dp_display, 0);
> +

Should you add a "pre_enable" and do it there? That would make it more
symmetric with the fact that you have the countertpart in
"post_disable".


Overall: I'm probably not familiar enough with this code to give it a
full review. I'm hoping that Dmitry knows it well enough... ;-)


-Doug