linux-kernel - Re: [PATCH 3/8] drm/ingenic: Use standard drm_atomic_helper_commit

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Message-Id: <ENEJXQ.6TCYILUOPORD@crapouillou.net>
Date:   Sun, 08 Aug 2021 22:09:14 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        "H . Nikolaus Schaller" <hns@...delico.com>,
        Paul Boddie <paul@...die.org.uk>, list@...ndingux.net,
        Sam Ravnborg <sam@...nborg.org>, linux-mips@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] drm/ingenic: Use standard
 drm_atomic_helper_commit_tail

Hi Christophe,

Le dim., août 8 2021 at 21:50:04 +0200, Christophe JAILLET 
<christophe.jaillet@...adoo.fr> a écrit :
> Le 08/08/2021 à 15:45, Paul Cercueil a écrit :
>> By making the CRTC's .vblank_enable() function return an error when 
>> it
>> is known that the hardware won't deliver a VBLANK, we can drop the
>> ingenic_drm_atomic_helper_commit_tail() function and use the standard
>> drm_atomic_helper_commit_tail() function instead.
>> 
>> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>> ---
>>   drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 28 
>> ++++-------------------
>>   1 file changed, 4 insertions(+), 24 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c 
>> b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> index bc71ba44ccf4..3ed7c27a8dde 100644
>> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> @@ -706,29 +706,6 @@ static int 
>> ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder,
>>   	}
>>   }
>>   -static void ingenic_drm_atomic_helper_commit_tail(struct 
>> drm_atomic_state *old_state)
>> -{
>> -	/*
>> -	 * Just your regular drm_atomic_helper_commit_tail(), but only 
>> calls
>> -	 * drm_atomic_helper_wait_for_vblanks() if priv->no_vblank.
>> -	 */
>> -	struct drm_device *dev = old_state->dev;
>> -	struct ingenic_drm *priv = drm_device_get_priv(dev);
>> -
>> -	drm_atomic_helper_commit_modeset_disables(dev, old_state);
>> -
>> -	drm_atomic_helper_commit_planes(dev, old_state, 0);
>> -
>> -	drm_atomic_helper_commit_modeset_enables(dev, old_state);
>> -
>> -	drm_atomic_helper_commit_hw_done(old_state);
>> -
>> -	if (!priv->no_vblank)
>> -		drm_atomic_helper_wait_for_vblanks(dev, old_state);
>> -
>> -	drm_atomic_helper_cleanup_planes(dev, old_state);
>> -}
>> 
> 
> Hi,
> if this function is removed, shouldn't:
>   static struct drm_mode_config_helper_funcs 
> ingenic_drm_mode_config_helpers = {
>   	.atomic_commit_tail = ingenic_drm_atomic_helper_commit_tail,
>   };
> be updated as well?
> 
> I've not seen it in the serie.

It is there though :) At the bottom of this very patch.

> Just my 2v.
> CJ

Cheers,
-Paul