linux-kernel - Re: [PATCH v2 4/6] drm/msm: Issue queued events when disabling crtc

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Message-ID: <0d69abf7-c425-2bd1-ef66-de465c46896d@codeaurora.org>
Date:   Mon, 2 Apr 2018 10:53:15 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Sean Paul <seanpaul@...omium.org>, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     robdclark@...il.com, hoegsberg@...omium.org, jsanka@...eaurora.org,
        abhinavk@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] drm/msm: Issue queued events when disabling crtc



On Thursday 29 March 2018 12:36 AM, Sean Paul wrote:
> Ensure that any queued events are issued when disabling the crtc. This
> avoids timeouts when we come back and wait for dependencies (like the
> previous frame's flip_done).

Reviewed-by: Archit Taneja <architt@...eaurora.org>

> 
> Changes in v2:
> - None
> 
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> ---
>   drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> index 76b96081916f..10271359789e 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> @@ -430,6 +430,7 @@ static void mdp5_crtc_atomic_disable(struct drm_crtc *crtc,
>   	struct mdp5_crtc_state *mdp5_cstate = to_mdp5_crtc_state(crtc->state);
>   	struct mdp5_kms *mdp5_kms = get_kms(crtc);
>   	struct device *dev = &mdp5_kms->pdev->dev;
> +	unsigned long flags;
>   
>   	DBG("%s", crtc->name);
>   
> @@ -445,6 +446,14 @@ static void mdp5_crtc_atomic_disable(struct drm_crtc *crtc,
>   	mdp_irq_unregister(&mdp5_kms->base, &mdp5_crtc->err);
>   	pm_runtime_put_sync(dev);
>   
> +	if (crtc->state->event && !crtc->state->active) {
> +		WARN_ON(mdp5_crtc->event);
> +		spin_lock_irqsave(&mdp5_kms->dev->event_lock, flags);
> +		drm_crtc_send_vblank_event(crtc, crtc->state->event);
> +		crtc->state->event = NULL;
> +		spin_unlock_irqrestore(&mdp5_kms->dev->event_lock, flags);
> +	}
> +
>   	mdp5_crtc->enabled = false;
>   }
>   
>