Quelle  sun4i_layer.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2015 Free Electrons
 * Copyright (C) 2015 NextThing Co
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_gem_atomic_helper.h>

#include "sun4i_backend.h"
#include "sun4i_frontend.h"
#include "sun4i_layer.h"
#include "sunxi_engine.h"

static void sun4i_backend_layer_reset(struct drm_plane *plane)
{
 struct sun4i_layer_state *state;

 if (plane->state) {
  state = state_to_sun4i_layer_state(plane->state);

  __drm_atomic_helper_plane_destroy_state(&state->state);

  kfree(state);
  plane->state = NULL;
 }

 state = kzalloc(sizeof(*state), GFP_KERNEL);
 if (state)
  __drm_atomic_helper_plane_reset(plane, &state->state);
}

static struct drm_plane_state *
sun4i_backend_layer_duplicate_state(struct drm_plane *plane)
{
 struct sun4i_layer_state *orig = state_to_sun4i_layer_state(plane->state);
 struct sun4i_layer_state *copy;

 copy = kzalloc(sizeof(*copy), GFP_KERNEL);
 if (!copy)
  return NULL;

 __drm_atomic_helper_plane_duplicate_state(plane, ©->state);
 copy->uses_frontend = orig->uses_frontend;

 return ©->state;
}

static void sun4i_backend_layer_destroy_state(struct drm_plane *plane,
           struct drm_plane_state *state)
{
 struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(state);

 __drm_atomic_helper_plane_destroy_state(state);

 kfree(s_state);
}

static void sun4i_backend_layer_atomic_disable(struct drm_plane *plane,
            struct drm_atomic_state *state)
{
 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
            plane);
 struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(old_state);
 struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
 struct sun4i_backend *backend = layer->backend;

 sun4i_backend_layer_enable(backend, layer->id, false);

 if (layer_state->uses_frontend) {
  unsigned long flags;

  spin_lock_irqsave(&backend->frontend_lock, flags);
  backend->frontend_teardown = true;
  spin_unlock_irqrestore(&backend->frontend_lock, flags);
 }
}

static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
           struct drm_atomic_state *state)
{
 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
            plane);
 struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(new_state);
 struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
 struct sun4i_backend *backend = layer->backend;
 struct sun4i_frontend *frontend = backend->frontend;

 sun4i_backend_cleanup_layer(backend, layer->id);

 if (layer_state->uses_frontend) {
  sun4i_frontend_init(frontend);
  sun4i_frontend_update_coord(frontend, plane);
  sun4i_frontend_update_buffer(frontend, plane);
  sun4i_frontend_update_formats(frontend, plane,
           DRM_FORMAT_XRGB8888);
  sun4i_backend_update_layer_frontend(backend, layer->id,
          DRM_FORMAT_XRGB8888);
  sun4i_frontend_enable(frontend);
 } else {
  sun4i_backend_update_layer_formats(backend, layer->id, plane);
  sun4i_backend_update_layer_buffer(backend, layer->id, 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);
}

static bool sun4i_layer_format_mod_supported(struct drm_plane *plane,
          uint32_t format, uint64_t modifier)
{
 struct sun4i_layer *layer = plane_to_sun4i_layer(plane);

 if (IS_ERR_OR_NULL(layer->backend->frontend))
  return sun4i_backend_format_is_supported(format, modifier);

 return sun4i_backend_format_is_supported(format, modifier) ||
        sun4i_frontend_format_is_supported(format, modifier);
}

static const struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
 .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 = sun4i_backend_layer_destroy_state,
 .atomic_duplicate_state = sun4i_backend_layer_duplicate_state,
 .destroy  = drm_plane_cleanup,
 .disable_plane  = drm_atomic_helper_disable_plane,
 .reset   = sun4i_backend_layer_reset,
 .update_plane  = drm_atomic_helper_update_plane,
 .format_mod_supported = sun4i_layer_format_mod_supported,
};

static const uint32_t sun4i_layer_formats[] = {
 DRM_FORMAT_ARGB8888,
 DRM_FORMAT_ARGB4444,
 DRM_FORMAT_ARGB1555,
 DRM_FORMAT_BGRX8888,
 DRM_FORMAT_RGBA5551,
 DRM_FORMAT_RGBA4444,
 DRM_FORMAT_RGB888,
 DRM_FORMAT_RGB565,
 DRM_FORMAT_NV12,
 DRM_FORMAT_NV16,
 DRM_FORMAT_NV21,
 DRM_FORMAT_NV61,
 DRM_FORMAT_UYVY,
 DRM_FORMAT_VYUY,
 DRM_FORMAT_XRGB8888,
 DRM_FORMAT_YUV411,
 DRM_FORMAT_YUV420,
 DRM_FORMAT_YUV422,
 DRM_FORMAT_YUV444,
 DRM_FORMAT_YUYV,
 DRM_FORMAT_YVU411,
 DRM_FORMAT_YVU420,
 DRM_FORMAT_YVU422,
 DRM_FORMAT_YVU444,
 DRM_FORMAT_YVYU,
};

static const uint32_t sun4i_backend_layer_formats[] = {
 DRM_FORMAT_ARGB8888,
 DRM_FORMAT_ARGB4444,
 DRM_FORMAT_ARGB1555,
 DRM_FORMAT_RGBA5551,
 DRM_FORMAT_RGBA4444,
 DRM_FORMAT_RGB888,
 DRM_FORMAT_RGB565,
 DRM_FORMAT_UYVY,
 DRM_FORMAT_VYUY,
 DRM_FORMAT_XRGB8888,
 DRM_FORMAT_YUYV,
 DRM_FORMAT_YVYU,
};

static const uint64_t sun4i_layer_modifiers[] = {
 DRM_FORMAT_MOD_LINEAR,
 DRM_FORMAT_MOD_ALLWINNER_TILED,
 DRM_FORMAT_MOD_INVALID
};

static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
      struct sun4i_backend *backend,
      enum drm_plane_type type,
      unsigned int id)
{
 const uint64_t *modifiers = sun4i_layer_modifiers;
 const uint32_t *formats = sun4i_layer_formats;
 unsigned int formats_len = ARRAY_SIZE(sun4i_layer_formats);
 struct sun4i_layer *layer;
 int ret;

 layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
 if (!layer)
  return ERR_PTR(-ENOMEM);

 layer->id = id;
 layer->backend = backend;

 if (IS_ERR_OR_NULL(backend->frontend)) {
  formats = sun4i_backend_layer_formats;
  formats_len = ARRAY_SIZE(sun4i_backend_layer_formats);
  modifiers = NULL;
 }

 /* possible crtcs are set later */
 ret = drm_universal_plane_init(drm, &layer->plane, 0,
           &sun4i_backend_layer_funcs,
           formats, formats_len,
           modifiers, 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);

 drm_plane_create_alpha_property(&layer->plane);
 drm_plane_create_zpos_property(&layer->plane, layer->id,
           0, SUN4I_BACKEND_NUM_LAYERS - 1);

 return layer;
}

struct drm_plane **sun4i_layers_init(struct drm_device *drm,
         struct sunxi_engine *engine)
{
 struct drm_plane **planes;
 struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
 int i;

 /* We need to have a sentinel at the need, hence the overallocation */
 planes = devm_kcalloc(drm->dev, SUN4I_BACKEND_NUM_LAYERS + 1,
         sizeof(*planes), GFP_KERNEL);
 if (!planes)
  return ERR_PTR(-ENOMEM);

 for (i = 0; i < SUN4I_BACKEND_NUM_LAYERS; i++) {
  enum drm_plane_type type = i ? DRM_PLANE_TYPE_OVERLAY : DRM_PLANE_TYPE_PRIMARY;
  struct sun4i_layer *layer;

  layer = sun4i_layer_init_one(drm, backend, type, i);
  if (IS_ERR(layer)) {
   dev_err(drm->dev, "Couldn't initialize %s plane\n",
    i ? "overlay" : "primary");
   return ERR_CAST(layer);
  }

  planes[i] = &layer->plane;
 }

 return planes;
}