linux-kernel - Re: [PATCH v2 4/6] drm/atomic: Don't skip drm_bridge_*() calls if !drm_encoder_helper

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Date:	Wed, 11 May 2016 18:55:04 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Noralf Trønnes <noralf@...nnes.org>
Cc:	dri-devel@...ts.freedesktop.org, daniel@...ll.ch,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] drm/atomic: Don't skip drm_bridge_*() calls if
 !drm_encoder_helper_funcs

On Wed, May 11, 2016 at 06:09:20PM +0200, Noralf Trønnes wrote:
> Don't skip drm_bridge_*() calls if encoder->helper_private is NULL.
> 
> Signed-off-by: Noralf Trønnes <noralf@...nnes.org>

Applied to drm-misc, thanks.
-Daniel

> ---
>  drivers/gpu/drm/drm_atomic_helper.c | 39 ++++++++++++++++---------------------
>  1 file changed, 17 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 027b227..46a3201 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -384,8 +384,6 @@ mode_fixup(struct drm_atomic_state *state)
>  		 */
>  		encoder = conn_state->best_encoder;
>  		funcs = encoder->helper_private;
> -		if (!funcs)
> -			continue;
>  
>  		ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode,
>  				&crtc_state->adjusted_mode);
> @@ -394,7 +392,7 @@ mode_fixup(struct drm_atomic_state *state)
>  			return -EINVAL;
>  		}
>  
> -		if (funcs->atomic_check) {
> +		if (funcs && funcs->atomic_check) {
>  			ret = funcs->atomic_check(encoder, crtc_state,
>  						  conn_state);
>  			if (ret) {
> @@ -402,7 +400,7 @@ mode_fixup(struct drm_atomic_state *state)
>  						 encoder->base.id, encoder->name);
>  				return ret;
>  			}
> -		} else if (funcs->mode_fixup) {
> +		} else if (funcs && funcs->mode_fixup) {
>  			ret = funcs->mode_fixup(encoder, &crtc_state->mode,
>  						&crtc_state->adjusted_mode);
>  			if (!ret) {
> @@ -696,8 +694,6 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
>  			continue;
>  
>  		funcs = encoder->helper_private;
> -		if (!funcs)
> -			continue;
>  
>  		DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
>  				 encoder->base.id, encoder->name);
> @@ -709,12 +705,14 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
>  		drm_bridge_disable(encoder->bridge);
>  
>  		/* Right function depends upon target state. */
> -		if (connector->state->crtc && funcs->prepare)
> -			funcs->prepare(encoder);
> -		else if (funcs->disable)
> -			funcs->disable(encoder);
> -		else if (funcs->dpms)
> -			funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
> +		if (funcs) {
> +			if (connector->state->crtc && funcs->prepare)
> +				funcs->prepare(encoder);
> +			else if (funcs->disable)
> +				funcs->disable(encoder);
> +			else if (funcs->dpms)
> +				funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
> +		}
>  
>  		drm_bridge_post_disable(encoder->bridge);
>  	}
> @@ -861,9 +859,6 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
>  
>  		encoder = connector->state->best_encoder;
>  		funcs = encoder->helper_private;
> -		if (!funcs)
> -			continue;
> -
>  		new_crtc_state = connector->state->crtc->state;
>  		mode = &new_crtc_state->mode;
>  		adjusted_mode = &new_crtc_state->adjusted_mode;
> @@ -878,7 +873,7 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
>  		 * Each encoder has at most one connector (since we always steal
>  		 * it away), so we won't call mode_set hooks twice.
>  		 */
> -		if (funcs->mode_set)
> +		if (funcs && funcs->mode_set)
>  			funcs->mode_set(encoder, mode, adjusted_mode);
>  
>  		drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
> @@ -969,8 +964,6 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
>  
>  		encoder = connector->state->best_encoder;
>  		funcs = encoder->helper_private;
> -		if (!funcs)
> -			continue;
>  
>  		DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
>  				 encoder->base.id, encoder->name);
> @@ -981,10 +974,12 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
>  		 */
>  		drm_bridge_pre_enable(encoder->bridge);
>  
> -		if (funcs->enable)
> -			funcs->enable(encoder);
> -		else if (funcs->commit)
> -			funcs->commit(encoder);
> +		if (funcs) {
> +			if (funcs->enable)
> +				funcs->enable(encoder);
> +			else if (funcs->commit)
> +				funcs->commit(encoder);
> +		}
>  
>  		drm_bridge_enable(encoder->bridge);
>  	}
> -- 
> 2.8.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch