[PATCH] drm: mali-dp: add custom plane ->reset hook

[PATCH] drm: mali-dp: add custom plane ->reset hook

[Mihail Atanassov]

The reset hook needs to allocate space for a
malidp_plane_state, which is larger than drm_plane_state.
Otherwise, the hook is identical to the default one.

Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>
---
 drivers/gpu/drm/arm/malidp_planes.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
index eff2fe4..686ff86 100644
--- a/drivers/gpu/drm/arm/malidp_planes.c
+++ b/drivers/gpu/drm/arm/malidp_planes.c
@@ -58,6 +58,27 @@ static void malidp_de_plane_destroy(struct drm_plane *plane)
 	devm_kfree(plane->dev->dev, mp);
 }
 
+/*
+ * Replicate what the default ->reset hook does: free the state pointer and
+ * allocate a new empty object. We just need enough space to store
+ * a malidp_plane_state instead of a drm_plane_state.
+ */
+static void malidp_plane_reset(struct drm_plane *plane)
+{
+	struct malidp_plane_state *state = to_malidp_plane_state(plane->state);
+
+	if (state)
+		__drm_atomic_helper_plane_destroy_state(&state->base);
+	kfree(state);
+	plane->state = NULL;
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (state) {
+		state->base.plane = plane;
+		state->base.rotation = DRM_ROTATE_0;
+		plane->state = &state->base;
+	}
+}
+
 static struct
 drm_plane_state *malidp_duplicate_plane_state(struct drm_plane *plane)
 {
@@ -92,7 +113,7 @@ static void malidp_destroy_plane_state(struct drm_plane *plane,
 	.disable_plane = drm_atomic_helper_disable_plane,
 	.set_property = drm_atomic_helper_plane_set_property,
 	.destroy = malidp_de_plane_destroy,
-	.reset = drm_atomic_helper_plane_reset,
+	.reset = malidp_plane_reset,
 	.atomic_duplicate_state = malidp_duplicate_plane_state,
 	.atomic_destroy_state = malidp_destroy_plane_state,
 };
-- 
1.9.1

Re: [PATCH] drm: mali-dp: add custom plane ->reset hook

[Liviu Dudau]

On Mon, Jan 30, 2017 at 03:42:26PM +0000, Mihail Atanassov wrote:
> The reset hook needs to allocate space for a
> malidp_plane_state, which is larger than drm_plane_state.
> Otherwise, the hook is identical to the default one.
> 
> Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>

Acked-by: Liviu Dudau <liviu.dudau@arm.com>

Thanks,
Liviu

> ---
>  drivers/gpu/drm/arm/malidp_planes.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
> index eff2fe4..686ff86 100644
> --- a/drivers/gpu/drm/arm/malidp_planes.c
> +++ b/drivers/gpu/drm/arm/malidp_planes.c
> @@ -58,6 +58,27 @@ static void malidp_de_plane_destroy(struct drm_plane *plane)
>  	devm_kfree(plane->dev->dev, mp);
>  }
>  
> +/*
> + * Replicate what the default ->reset hook does: free the state pointer and
> + * allocate a new empty object. We just need enough space to store
> + * a malidp_plane_state instead of a drm_plane_state.
> + */
> +static void malidp_plane_reset(struct drm_plane *plane)
> +{
> +	struct malidp_plane_state *state = to_malidp_plane_state(plane->state);
> +
> +	if (state)
> +		__drm_atomic_helper_plane_destroy_state(&state->base);
> +	kfree(state);
> +	plane->state = NULL;
> +	state = kzalloc(sizeof(*state), GFP_KERNEL);
> +	if (state) {
> +		state->base.plane = plane;
> +		state->base.rotation = DRM_ROTATE_0;
> +		plane->state = &state->base;
> +	}
> +}
> +
>  static struct
>  drm_plane_state *malidp_duplicate_plane_state(struct drm_plane *plane)
>  {
> @@ -92,7 +113,7 @@ static void malidp_destroy_plane_state(struct drm_plane *plane,
>  	.disable_plane = drm_atomic_helper_disable_plane,
>  	.set_property = drm_atomic_helper_plane_set_property,
>  	.destroy = malidp_de_plane_destroy,
> -	.reset = drm_atomic_helper_plane_reset,
> +	.reset = malidp_plane_reset,
>  	.atomic_duplicate_state = malidp_duplicate_plane_state,
>  	.atomic_destroy_state = malidp_destroy_plane_state,
>  };
> -- 
> 1.9.1
> 

-- 
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