Release 4.7 drivers/gpu/drm/sun4i/sun4i_layer.c
/*
* Copyright (C) 2015 Free Electrons
* Copyright (C) 2015 NextThing Co
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* 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;
}
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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);
}
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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);
}
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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[] = {
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB8888,
DRM_FORMAT_RGB888,
};
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),
&sun4i_backend_layer_funcs,
sun4i_backend_layer_formats,
ARRAY_SIZE(sun4i_backend_layer_formats),
type,
NULL);
if (ret) {
dev_err(drm->dev, "Couldn't initialize layer\n");
return ERR_PTR(ret);
}
drm_plane_helper_add(&layer->plane,
&sun4i_backend_layer_helper_funcs);
layer->drv = drv;
if (type == DRM_PLANE_TYPE_PRIMARY)
drv->primary = &layer->plane;
return layer;
}
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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),
GFP_KERNEL);
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)
? DRM_PLANE_TYPE_PRIMARY
: DRM_PLANE_TYPE_OVERLAY;
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),
SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK,
SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(i));
layer->id = i;
};
return layers;
}
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