linux-kernel - Re: [PATCH v3 3/7] drm/msm/dp: use drm_bridge_hpd

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Date:   Sat, 16 Sep 2023 03:41:46 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
        agross@...nel.org, andersson@...nel.org, quic_abhinavk@...cinc.com,
        quic_jesszhan@...cinc.com, quic_sbillaka@...cinc.com,
        marijn.suijten@...ainline.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/7] drm/msm/dp: use drm_bridge_hpd_notify() to report
 HPD status changes

On Sat, 16 Sept 2023 at 00:38, Kuogee Hsieh <quic_khsieh@...cinc.com> wrote:
>
> Currently DP driver use drm_helper_hpd_irq_event(), bypassing drm bridge
> framework, to report HPD status changes to user space frame work.
> Replace it with drm_bridge_hpd_notify() since DP driver is part of drm
> bridge.
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Also see the comment below.

> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 20 ++------------------
>  1 file changed, 2 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 18d16c7..59f9d85 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -356,26 +356,10 @@ static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
>                 (dp->link->sink_count == 0);
>  }
>
> -static void dp_display_send_hpd_event(struct msm_dp *dp_display)
> -{
> -       struct dp_display_private *dp;
> -       struct drm_connector *connector;
> -
> -       dp = container_of(dp_display, struct dp_display_private, dp_display);
> -
> -       connector = dp->dp_display.connector;
> -       drm_helper_hpd_irq_event(connector->dev);
> -}
> -
>  static int dp_display_send_hpd_notification(struct dp_display_private *dp,
>                                             bool hpd)
>  {
> -       if ((hpd && dp->dp_display.link_ready) ||
> -                       (!hpd && !dp->dp_display.link_ready)) {
> -               drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
> -                               (hpd ? "on" : "off"));
> -               return 0;
> -       }
> +       struct drm_bridge *bridge = dp->dp_display.bridge;
>
>         /* reset video pattern flag on disconnect */
>         if (!hpd)

Note, this part (resetting the video_test and setting of is_connected)
should be moved to the dp_bridge_hpd_notify() too. Please ignore this
comment if this is handled later in the series.

> @@ -385,7 +369,7 @@ static int dp_display_send_hpd_notification(struct dp_display_private *dp,
>
>         drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
>                         dp->dp_display.connector_type, hpd);
> -       dp_display_send_hpd_event(&dp->dp_display);
> +       drm_bridge_hpd_notify(bridge, dp->dp_display.link_ready);
>
>         return 0;
>  }
> --
> 2.7.4
>


-- 
With best wishes
Dmitry