linux-kernel - Re: [PATCH 3/8] drm/sun4i: sun4i_layer: Add a custom plane state

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Message-ID: <c1e2f2eb-2871-2220-f5f6-6fa23fc9be59@baylibre.com>
Date:   Wed, 13 Dec 2017 17:05:41 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        thomas@...sch.nl
Subject: Re: [PATCH 3/8] drm/sun4i: sun4i_layer: Add a custom plane state

On 13/12/2017 16:33, Maxime Ripard wrote:
> We will need to store some additional data in the future to the state.
> Create a custom plane state that will embed those data, in order to store
> the pipe or whether or not that plane should use the frontend.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_layer.c | 48 ++++++++++++++++++++++++++++--
>  drivers/gpu/drm/sun4i/sun4i_layer.h | 10 ++++++-
>  2 files changed, 55 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
> index 7bddf12548d3..c3afcf888906 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> @@ -25,6 +25,48 @@ struct sun4i_plane_desc {
>  	       uint32_t                nformats;
>  };
>  
> +static void sun4i_backend_layer_reset(struct drm_plane *plane)
> +{
> +	struct sun4i_layer_state *state;
> +
> +	if (plane->state) {
> +		state = state_to_sun4i_layer_state(plane->state);
> +
> +		__drm_atomic_helper_plane_destroy_state(&state->state);

Maybe a blank line here ?

> +		kfree(state);
> +		plane->state = NULL;
> +	}
> +
> +	state = kzalloc(sizeof(*state), GFP_KERNEL);
> +	if (state) {
> +		plane->state = &state->state;
> +		plane->state->plane = plane;
> +	}
> +}
> +
> +static struct drm_plane_state *
> +sun4i_backend_layer_duplicate_state(struct drm_plane *plane)
> +{
> +	struct sun4i_layer_state *copy;
> +
> +	copy = kzalloc(sizeof(*copy), GFP_KERNEL);
> +	if (!copy)
> +		return NULL;
> +
> +	__drm_atomic_helper_plane_duplicate_state(plane, &copy->state);
> +
> +	return &copy->state;
> +}
> +
> +static void sun4i_backend_layer_destroy_state(struct drm_plane *plane,
> +					      struct drm_plane_state *state)
> +{
> +	struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(state);
> +
> +	__drm_atomic_helper_plane_destroy_state(state);

You can add a blank line here

> +	kfree(s_state);
> +}
> +
>  static void sun4i_backend_layer_atomic_disable(struct drm_plane *plane,
>  					       struct drm_plane_state *old_state)
>  {
> @@ -52,11 +94,11 @@ static const struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
>  };
>  
>  static const struct drm_plane_funcs sun4i_backend_layer_funcs = {
> -	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> -	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
> +	.atomic_destroy_state	= sun4i_backend_layer_destroy_state,
> +	.atomic_duplicate_state	= sun4i_backend_layer_duplicate_state,
>  	.destroy		= drm_plane_cleanup,
>  	.disable_plane		= drm_atomic_helper_disable_plane,
> -	.reset			= drm_atomic_helper_plane_reset,
> +	.reset			= sun4i_backend_layer_reset,
>  	.update_plane		= drm_atomic_helper_update_plane,
>  };
>  
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h b/drivers/gpu/drm/sun4i/sun4i_layer.h
> index 4e84f438b346..d2c19348d1b0 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
> @@ -22,12 +22,22 @@ struct sun4i_layer {
>  	int			id;
>  };
>  
> +struct sun4i_layer_state {
> +	struct drm_plane_state	state;
> +};
> +
>  static inline struct sun4i_layer *
>  plane_to_sun4i_layer(struct drm_plane *plane)
>  {
>  	return container_of(plane, struct sun4i_layer, plane);
>  }
>  
> +static inline struct sun4i_layer_state *
> +state_to_sun4i_layer_state(struct drm_plane_state *state)
> +{
> +	return container_of(state, struct sun4i_layer_state, state);
> +}
> +
>  struct drm_plane **sun4i_layers_init(struct drm_device *drm,
>  				     struct sunxi_engine *engine);
>  
> 

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>