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SubjectRe: [PATCH v2 14/19] drm/sun4i: backend: Add support for zpos
On Mon, Jan 22, 2018 at 6:35 PM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> Our various planes have a configurable zpos, that combined with the pipes
> allow to configure the composition.
>
> Since the interaction between the pipes, zpos and alphas framebuffers are

^^^ is

> not trivials, let's just enable the zpos as an immutable property for now,

^^^^^^^ trivial

> and use that zpos in our atomic_update part.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> ---
> drivers/gpu/drm/sun4i/sun4i_backend.c | 15 +++++++++++++++
> drivers/gpu/drm/sun4i/sun4i_backend.h | 2 ++
> drivers/gpu/drm/sun4i/sun4i_framebuffer.c | 4 ++++
> drivers/gpu/drm/sun4i/sun4i_layer.c | 3 +++
> 4 files changed, 24 insertions(+)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index a18c86a15748..c4986054909b 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -272,6 +272,21 @@ int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
> return 0;
> }
>
> +int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer,
> + struct drm_plane *plane)
> +{
> + struct drm_plane_state *state = plane->state;
> + unsigned int priority = state->normalized_zpos;
> +
> + DRM_DEBUG_DRIVER("Setting layer %d priority to %d\n", layer, priority);

You might want to make the statement less ambiguous, like

"Setting layer %d's priority ..."

Otherwise,

Reviewed-by: Chen-Yu Tsai <wens@csie.org>

> +
> + regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
> + SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK,
> + SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority));
> +
> + return 0;
> +}
> +
> static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state)
> {
> u16 src_h = state->src_h >> 16;
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h
> index 1ca8b7db6807..04a4f11b87a8 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
> @@ -182,5 +182,7 @@ int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
> int layer, struct drm_plane *plane);
> int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend,
> int layer, uint32_t in_fmt);
> +int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend,
> + int layer, struct drm_plane *plane);
>
> #endif /* _SUN4I_BACKEND_H_ */
> diff --git a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
> index e68004844abe..5b3986437a50 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
> @@ -35,6 +35,10 @@ static int sun4i_de_atomic_check(struct drm_device *dev,
> if (ret)
> return ret;
>
> + ret = drm_atomic_normalize_zpos(dev, state);
> + if (ret)
> + return ret;
> +
> return drm_atomic_helper_check_planes(dev, state);
> }
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
> index 03549646528a..fbf25d59cf88 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> @@ -115,6 +115,7 @@ static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
> }
>
> sun4i_backend_update_layer_coord(backend, layer->id, plane);
> + sun4i_backend_update_layer_zpos(backend, layer->id, plane);
> sun4i_backend_layer_enable(backend, layer->id, true);
> }
>
> @@ -237,6 +238,8 @@ struct drm_plane **sun4i_layers_init(struct drm_device *drm,
> return ERR_CAST(layer);
> };
>
> + drm_plane_create_zpos_immutable_property(&layer->plane, i);
> +
> DRM_DEBUG_DRIVER("Assigning %s plane to pipe %d\n",
> i ? "overlay" : "primary", plane->pipe);
> regmap_update_bits(engine->regs, SUN4I_BACKEND_ATTCTL_REG0(i),
> --
> git-series 0.9.1

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