Re: [PATCH 01/10] drm/atomic: Add __drm_atomic_helper_plane_reset

From: Ayan Halder <ayan.halder@arm.com>
To: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Cc: alexandre.belloni@bootlin.com, airlied@linux.ie,
	liviu.dudau@arm.com, dri-devel@lists.freedesktop.org,
	laurent.pinchart@ideasonboard.com, thellstrom@vmware.com,
	krzk@kernel.org, maxime.ripard@bootlin.com, wens@csie.org,
	kgene@kernel.org, malidp@foss.arm.com,
	linux-graphics-maintainer@vmware.com, sunpeng.li@amd.com,
	boris.brezillon@bootlin.com, linux-samsung-soc@vger.kernel.org,
	nd@arm.com, Tony.Cheng@amd.com,
	linux-arm-kernel@lists.infradead.org, sw0312.kim@samsung.com,
	nicolas.ferre@microchip.com, shirish.s@amd.com,
	kyungmin.park@samsung.com, alexander.deucher@amd.com,
	christian.koenig@amd.com
Subject: Re: [PATCH 01/10] drm/atomic: Add  __drm_atomic_helper_plane_reset
Date: Mon, 23 Jul 2018 10:37:57 +0100	[thread overview]
Message-ID: <20180723093757.GB26447@arm.com> (raw)
In-Reply-To: <20180720211509.23605-2-alexandru-cosmin.gheorghe@arm.com>

On Fri, Jul 20, 2018 at 10:15:00PM +0100, Alexandru Gheorghe wrote:
> There are a lot of drivers that subclass drm_plane_state, all of them
> duplicate the code that links toghether the plane with plane_state.
> 
> On top of that, drivers that enable core properties also have to
> duplicate the code for initializing the properties to their default
> values, which in all cases are the same as the defaults from core.
> 
> Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
> ---
>  drivers/gpu/drm/drm_atomic_helper.c | 32 +++++++++++++++++++++--------
>  include/drm/drm_atomic_helper.h     |  2 ++
>  2 files changed, 25 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 8008a7de2e10..e1c6f101652e 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -3507,6 +3507,28 @@ void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
>  }
>  EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
>  
> +/**
> + * __drm_atomic_helper_plane_reset - resets planes state to default values
> + * @plane: plane object
> + * @new_state: atomic plane state
> + *
> + * Initializes plane state to default. This is useful for drivers that subclass
> + * the plane state.
> + */
> +void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
> +				     struct drm_plane_state *state)
> +{
> +	if (state) {
> +		state->plane = plane;
> +		state->rotation = DRM_MODE_ROTATE_0;
> +		/* Reset the alpha value to fully opaque if it matters */
> +		if (plane->alpha_property)
> +			state->alpha = plane->alpha_property->values[1];
> +	}
> +	plane->state = state;
> +}
> +EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);
> +
>  /**
>   * drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes
>   * @plane: drm plane
> @@ -3521,15 +3543,7 @@ void drm_atomic_helper_plane_reset(struct drm_plane *plane)
>  
>  	kfree(plane->state);
>  	plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
> -
> -	if (plane->state) {
> -		plane->state->plane = plane;
> -		plane->state->rotation = DRM_MODE_ROTATE_0;
> -
> -		/* Reset the alpha value to fully opaque if it matters */
> -		if (plane->alpha_property)
> -			plane->state->alpha = plane->alpha_property->values[1];
> -	}
> +	__drm_atomic_helper_plane_reset(plane, plane->state);
>  }
>  EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
>  
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index 26aaba58d6ce..2dd40c761dfd 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -155,6 +155,8 @@ void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state);
>  void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
>  					  struct drm_crtc_state *state);
>  
> +void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
> +				     struct drm_plane_state *state);
>  void drm_atomic_helper_plane_reset(struct drm_plane *plane);
>  void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
>  					       struct drm_plane_state *state);
> -- 
> 2.18.0
> 
With my limited knowledge on DRM, this looks OK to me:-
Reviewed-by :- Ayan Kumar halder <ayan.halder@arm.com>
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