linux-kernel - Re: [PATCH] drm/sti: clean up after drm_atomic_helper

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Date:   Mon, 15 Oct 2018 10:00:33 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     airlied@...ux.ie, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/sti: clean up after drm_atomic_helper_shutdown rework

On Fri, Oct 12, 2018 at 11:46:39AM +0200, Benjamin Gaignard wrote:
> Since drm_atomic_helper_shutdown() rework it is possible to do additional
> clean up in sti driver: custom plane destroy functions become useless and
> clean up encoder is no more needed.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> ---
>  drivers/gpu/drm/sti/sti_cursor.c |  9 +--------
>  drivers/gpu/drm/sti/sti_gdp.c    |  9 +--------
>  drivers/gpu/drm/sti/sti_hqvdp.c  |  9 +--------
>  drivers/gpu/drm/sti/sti_tvout.c  | 24 ------------------------
>  4 files changed, 3 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sti/sti_cursor.c b/drivers/gpu/drm/sti/sti_cursor.c
> index bc908453ffb3..e1ba253055c7 100644
> --- a/drivers/gpu/drm/sti/sti_cursor.c
> +++ b/drivers/gpu/drm/sti/sti_cursor.c
> @@ -328,13 +328,6 @@ static const struct drm_plane_helper_funcs sti_cursor_helpers_funcs = {
>  	.atomic_disable = sti_cursor_atomic_disable,
>  };
>  
> -static void sti_cursor_destroy(struct drm_plane *drm_plane)
> -{
> -	DRM_DEBUG_DRIVER("\n");
> -
> -	drm_plane_cleanup(drm_plane);
> -}
> -
>  static int sti_cursor_late_register(struct drm_plane *drm_plane)
>  {
>  	struct sti_plane *plane = to_sti_plane(drm_plane);
> @@ -346,7 +339,7 @@ static int sti_cursor_late_register(struct drm_plane *drm_plane)
>  static const struct drm_plane_funcs sti_cursor_plane_helpers_funcs = {
>  	.update_plane = drm_atomic_helper_update_plane,
>  	.disable_plane = drm_atomic_helper_disable_plane,
> -	.destroy = sti_cursor_destroy,
> +	.destroy = drm_plane_cleanup,
>  	.reset = sti_plane_reset,
>  	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> diff --git a/drivers/gpu/drm/sti/sti_gdp.c b/drivers/gpu/drm/sti/sti_gdp.c
> index 3c19614d3f75..87b50451afd7 100644
> --- a/drivers/gpu/drm/sti/sti_gdp.c
> +++ b/drivers/gpu/drm/sti/sti_gdp.c
> @@ -879,13 +879,6 @@ static const struct drm_plane_helper_funcs sti_gdp_helpers_funcs = {
>  	.atomic_disable = sti_gdp_atomic_disable,
>  };
>  
> -static void sti_gdp_destroy(struct drm_plane *drm_plane)
> -{
> -	DRM_DEBUG_DRIVER("\n");
> -
> -	drm_plane_cleanup(drm_plane);
> -}
> -
>  static int sti_gdp_late_register(struct drm_plane *drm_plane)
>  {
>  	struct sti_plane *plane = to_sti_plane(drm_plane);
> @@ -897,7 +890,7 @@ static int sti_gdp_late_register(struct drm_plane *drm_plane)
>  static const struct drm_plane_funcs sti_gdp_plane_helpers_funcs = {
>  	.update_plane = drm_atomic_helper_update_plane,
>  	.disable_plane = drm_atomic_helper_disable_plane,
> -	.destroy = sti_gdp_destroy,
> +	.destroy = drm_plane_cleanup,
>  	.reset = sti_plane_reset,
>  	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> diff --git a/drivers/gpu/drm/sti/sti_hqvdp.c b/drivers/gpu/drm/sti/sti_hqvdp.c
> index 23565f52dd71..065a5b08a702 100644
> --- a/drivers/gpu/drm/sti/sti_hqvdp.c
> +++ b/drivers/gpu/drm/sti/sti_hqvdp.c
> @@ -1256,13 +1256,6 @@ static const struct drm_plane_helper_funcs sti_hqvdp_helpers_funcs = {
>  	.atomic_disable = sti_hqvdp_atomic_disable,
>  };
>  
> -static void sti_hqvdp_destroy(struct drm_plane *drm_plane)
> -{
> -	DRM_DEBUG_DRIVER("\n");
> -
> -	drm_plane_cleanup(drm_plane);
> -}
> -
>  static int sti_hqvdp_late_register(struct drm_plane *drm_plane)
>  {
>  	struct sti_plane *plane = to_sti_plane(drm_plane);
> @@ -1274,7 +1267,7 @@ static int sti_hqvdp_late_register(struct drm_plane *drm_plane)
>  static const struct drm_plane_funcs sti_hqvdp_plane_helpers_funcs = {
>  	.update_plane = drm_atomic_helper_update_plane,
>  	.disable_plane = drm_atomic_helper_disable_plane,
> -	.destroy = sti_hqvdp_destroy,
> +	.destroy = drm_plane_cleanup,
>  	.reset = sti_plane_reset,
>  	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> diff --git a/drivers/gpu/drm/sti/sti_tvout.c b/drivers/gpu/drm/sti/sti_tvout.c
> index ea4a3b87fa55..4dc3b2ec40eb 100644
> --- a/drivers/gpu/drm/sti/sti_tvout.c
> +++ b/drivers/gpu/drm/sti/sti_tvout.c
> @@ -788,21 +788,6 @@ static void sti_tvout_create_encoders(struct drm_device *dev,
>  	tvout->dvo = sti_tvout_create_dvo_encoder(dev, tvout);
>  }
>  
> -static void sti_tvout_destroy_encoders(struct sti_tvout *tvout)
> -{
> -	if (tvout->hdmi)
> -		drm_encoder_cleanup(tvout->hdmi);
> -	tvout->hdmi = NULL;
> -
> -	if (tvout->hda)
> -		drm_encoder_cleanup(tvout->hda);
> -	tvout->hda = NULL;
> -
> -	if (tvout->dvo)
> -		drm_encoder_cleanup(tvout->dvo);
> -	tvout->dvo = NULL;
> -}
> -
>  static int sti_tvout_bind(struct device *dev, struct device *master, void *data)
>  {
>  	struct sti_tvout *tvout = dev_get_drvdata(dev);
> @@ -815,17 +800,8 @@ static int sti_tvout_bind(struct device *dev, struct device *master, void *data)
>  	return 0;
>  }
>  
> -static void sti_tvout_unbind(struct device *dev, struct device *master,
> -	void *data)
> -{
> -	struct sti_tvout *tvout = dev_get_drvdata(dev);
> -
> -	sti_tvout_destroy_encoders(tvout);
> -}
> -
>  static const struct component_ops sti_tvout_ops = {
>  	.bind	= sti_tvout_bind,
> -	.unbind	= sti_tvout_unbind,

Hm, this here looks strange now. I'd put a comment somewhere that
master_ops->unbind cleans up everything. Either way:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

>  };
>  
>  static int sti_tvout_probe(struct platform_device *pdev)
> -- 
> 2.15.0
> 

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