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* Copyright (C) 2015 Free Electrons
* Copyright (C) 2015 NextThing Co
* Maxime Ripard <>
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_plane_helper.h>
#include <drm/drmP.h>
#include "sun4i_backend.h"
#include "sun4i_drv.h"
#include "sun4i_layer.h"
#define SUN4I_NUM_LAYERS 2
static int sun4i_backend_layer_atomic_check(struct drm_plane *plane,
struct drm_plane_state *state)
return 0;
static void sun4i_backend_layer_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *old_state)
struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
struct sun4i_drv *drv = layer->drv;
struct sun4i_backend *backend = drv->backend;
sun4i_backend_layer_enable(backend, layer->id, false);
static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
struct drm_plane_state *old_state)
struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
struct sun4i_drv *drv = layer->drv;
struct sun4i_backend *backend = drv->backend;
sun4i_backend_update_layer_coord(backend, layer->id, plane);
sun4i_backend_update_layer_formats(backend, layer->id, plane);
sun4i_backend_update_layer_buffer(backend, layer->id, plane);
sun4i_backend_layer_enable(backend, layer->id, true);
static struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
.atomic_check = sun4i_backend_layer_atomic_check,
.atomic_disable = sun4i_backend_layer_atomic_disable,
.atomic_update = sun4i_backend_layer_atomic_update,
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,
.destroy = drm_plane_cleanup,
.disable_plane = drm_atomic_helper_disable_plane,
.reset = drm_atomic_helper_plane_reset,
.update_plane = drm_atomic_helper_update_plane,
static const uint32_t sun4i_backend_layer_formats[] = {
static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
enum drm_plane_type type)
struct sun4i_drv *drv = drm->dev_private;
struct sun4i_layer *layer;
int ret;
layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
if (!layer)
return ERR_PTR(-ENOMEM);
ret = drm_universal_plane_init(drm, &layer->plane, BIT(0),
if (ret) {
dev_err(drm->dev, "Couldn't initialize layer\n");
return ERR_PTR(ret);
layer->drv = drv;
drv->primary = &layer->plane;
return layer;
struct sun4i_layer **sun4i_layers_init(struct drm_device *drm)
struct sun4i_drv *drv = drm->dev_private;
struct sun4i_layer **layers;
int i;
layers = devm_kcalloc(drm->dev, SUN4I_NUM_LAYERS, sizeof(**layers),
if (!layers)
return ERR_PTR(-ENOMEM);
* The hardware is a bit unusual here.
* Even though it supports 4 layers, it does the composition
* in two separate steps.
* The first one is assigning a layer to one of its two
* pipes. If more that 1 layer is assigned to the same pipe,
* and if pixels overlaps, the pipe will take the pixel from
* the layer with the highest priority.
* The second step is the actual alpha blending, that takes
* the two pipes as input, and uses the eventual alpha
* component to do the transparency between the two.
* This two steps scenario makes us unable to guarantee a
* robust alpha blending between the 4 layers in all
* situations. So we just expose two layers, one per pipe. On
* SoCs that support it, sprites could fill the need for more
* layers.
for (i = 0; i < SUN4I_NUM_LAYERS; i++) {
enum drm_plane_type type = (i == 0)
struct sun4i_layer *layer = layers[i];
layer = sun4i_layer_init_one(drm, type);
if (IS_ERR(layer)) {
dev_err(drm->dev, "Couldn't initialize %s plane\n",
i ? "overlay" : "primary");
return ERR_CAST(layer);
DRM_DEBUG_DRIVER("Assigning %s plane to pipe %d\n",
i ? "overlay" : "primary", i);
regmap_update_bits(drv->backend->regs, SUN4I_BACKEND_ATTCTL_REG0(i),
layer->id = i;
return layers;