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

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Message-ID: <645818ed642db192a252343199ecbcc5@codeaurora.org>
Date:   Thu, 15 Apr 2021 10:40:44 -0700
From:   khsieh@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     robdclark@...il.com, sean@...rly.run, tanmay@...eaurora.org,
        abhinavk@...eaurora.org, aravindh@...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

On 2021-04-14 14:22, Stephen Boyd wrote:
> 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.
> 
This is my mistake, it still need signal audio here, will fix it

>> -       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))