linux-kernel - Re: [PATCH 4/4] drm/rockchip: vop2: Add missing call to crtc reset helper

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Message-ID: <1f20a832-6339-0feb-3647-cea7598e60be@kwiboo.se>
Date:   Wed, 21 Jun 2023 15:41:46 +0000 (UTC)
From:   Jonas Karlman <jonas@...boo.se>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Sandy Huang <hjc@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh@...nel.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Mark Yao <markyao0591@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] drm/rockchip: vop2: Add missing call to crtc reset
 helper

On 2023-06-21 10:11, Sascha Hauer wrote:
> On Tue, Jun 20, 2023 at 06:47:39AM +0000, Jonas Karlman wrote:
>> Add missing call to crtc reset helper to properly vblank reset.
>>
>> Also move vop2_crtc_reset and call vop2_crtc_destroy_state to simplify
>> and remove duplicated code.
>>
>> Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
>> Signed-off-by: Jonas Karlman <jonas@...boo.se>
>> ---
>>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 28 ++++++++------------
>>  1 file changed, 11 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>> index f725487d02ef..1be84fe0208f 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>> @@ -2080,23 +2080,6 @@ static const struct drm_crtc_helper_funcs vop2_crtc_helper_funcs = {
>>  	.atomic_disable = vop2_crtc_atomic_disable,
>>  };
>>  
>> -static void vop2_crtc_reset(struct drm_crtc *crtc)
>> -{
>> -	struct rockchip_crtc_state *vcstate = to_rockchip_crtc_state(crtc->state);
>> -
>> -	if (crtc->state) {
>> -		__drm_atomic_helper_crtc_destroy_state(crtc->state);
>> -		kfree(vcstate);
>> -	}
>> -
>> -	vcstate = kzalloc(sizeof(*vcstate), GFP_KERNEL);
>> -	if (!vcstate)
>> -		return;
>> -
>> -	crtc->state = &vcstate->base;
>> -	crtc->state->crtc = crtc;
>> -}
>> -
>>  static struct drm_crtc_state *vop2_crtc_duplicate_state(struct drm_crtc *crtc)
>>  {
>>  	struct rockchip_crtc_state *vcstate;
>> @@ -2123,6 +2106,17 @@ static void vop2_crtc_destroy_state(struct drm_crtc *crtc,
>>  	kfree(vcstate);
>>  }
>>  
>> +static void vop2_crtc_reset(struct drm_crtc *crtc)
>> +{
>> +	struct rockchip_crtc_state *vcstate =
>> +		kzalloc(sizeof(*vcstate), GFP_KERNEL);
>> +
>> +	if (crtc->state)
>> +		vop2_crtc_destroy_state(crtc, crtc->state);
>> +
>> +	__drm_atomic_helper_crtc_reset(crtc, &vcstate->base);
>> +}
> 
> You missed to check for allocation failures before using vcstate.

Good catch, I will fix for both vop and vop2 driver in v2.

Regards,
Jonas

> 
> Sascha
>