linux-kernel - Re: [PATCH v2 2/3] drm/msm/dp: initialize audio

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Date:   Wed, 14 Apr 2021 14:22:49 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <khsieh@...eaurora.org>, robdclark@...il.com,
        sean@...rly.run
Cc:     tanmay@...eaurora.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, khsieh@...eaurora.org, airlied@...ux.ie,
        daniel@...ll.ch, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] drm/msm/dp: initialize audio_comp when audio starts

Quoting Kuogee Hsieh (2021-04-14 14:02:50)
> Initialize audio_comp when audio starts and wait for audio_comp at
> dp_display_disable(). This will take care of both dongle unplugged
> and display off (suspend) cases.
> 
> Changes in v2:
> -- add dp_display_start_audio()
> 
> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>

Looking better. Thanks!

> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 0ba71c7..8a69bcd 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -177,6 +177,14 @@ static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
>  
>         return 0;
>  }
> +void dp_display_start_audio(struct msm_dp *dp_display)

Please unstick this from previous function by adding a newline above.

> +{
> +       struct dp_display_private *dp;
> +
> +       dp = container_of(dp_display, struct dp_display_private, dp_display);
> +
> +       reinit_completion(&dp->audio_comp);
> +}
>  
>  void dp_display_signal_audio_complete(struct msm_dp *dp_display)
>  {
> @@ -648,10 +656,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
>         /* start sentinel checking in case of missing uevent */
>         dp_add_event(dp, EV_DISCONNECT_PENDING_TIMEOUT, 0, DP_TIMEOUT_5_SECOND);
>  
> -       /* signal the disconnect event early to ensure proper teardown */

This doesn't need to be done early anymore? Please mention why in the
commit text.

> -       reinit_completion(&dp->audio_comp);
> -       dp_display_handle_plugged_change(g_dp_display, false);
> -
>         dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK |
>                                         DP_DP_IRQ_HPD_INT_MASK, true);
>  
> @@ -894,7 +898,6 @@ static int dp_display_disable(struct dp_display_private *dp, u32 data)
>         /* wait only if audio was enabled */
>         if (dp_display->audio_enabled) {
>                 /* signal the disconnect event */
> -               reinit_completion(&dp->audio_comp);
>                 dp_display_handle_plugged_change(dp_display, false);
>                 if (!wait_for_completion_timeout(&dp->audio_comp,
>                                 HZ * 5))