Re: [PATCH v2 17/24] drm/msm: dpu: Move pm_runtime_(get|put) from vblank_enable

[Jeykumar Sankaran <jsanka@codeaurora.org>]

On 2018-11-16 10:42, Sean Paul wrote:
> From: Sean Paul <seanpaul@chromium.org>
> 
> There are 4 times that _dpu_crtc_vblank_enable_no_lock() is called:
> 
> 1- crtc enable
> 2- crtc disable
> 3- crtc vblank enable
> 4- crtc vblank disable
> 
> When we enable or disable the crtc, we call drm_crtc_vblank_on and
> drm_crtc_vblank_off respectively. That will gate vblank enables and
> disables to only being called when the crtc is active. That means that
> we can just enable/disable pm runtime in crtc enable/disable. This will
> be beneficial in trying to eliminate blocking calls from the vblank 
> call
> chain.
> 
> Changes in v2:
> - None
> 
> Signed-off-by: Sean Paul <seanpaul@chromium.org>

Reviewed-by: Jeykumar Sankaran <jsanka@codeaurora.org>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index cd0a0bea4335..c49aaf412b6e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -769,8 +769,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
>  	struct drm_encoder *enc;
> 
>  	if (enable) {
> -		pm_runtime_get_sync(dev->dev);
> -
>  		list_for_each_entry(enc, &dev->mode_config.encoder_list,
> head) {
>  			if (enc->crtc != crtc)
>  				continue;
> @@ -793,8 +791,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
> 
>  			dpu_encoder_register_vblank_callback(enc, NULL,
> NULL);
>  		}
> -
> -		pm_runtime_put_sync(dev->dev);
>  	}
>  }
> 
> @@ -891,6 +887,8 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
>  		crtc->state->event = NULL;
>  		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
>  	}
> +
> +	pm_runtime_put_sync(crtc->dev->dev);
>  }
> 
>  static void dpu_crtc_enable(struct drm_crtc *crtc,
> @@ -906,6 +904,8 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>  	}
>  	priv = crtc->dev->dev_private;
> 
> +	pm_runtime_get_sync(crtc->dev->dev);
> +
>  	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
>  	dpu_crtc = to_dpu_crtc(crtc);

-- 
Jeykumar S
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