drivers/gpu/drm/exynos/exynos_drm_fb.c

   1 /* exynos_drm_fb.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_fb_helper.h>
  19 #include <drm/drm_atomic.h>
  20 #include <drm/drm_atomic_helper.h>
  21 #include <uapi/drm/exynos_drm.h>
  22
  23 #include "exynos_drm_drv.h"
  24 #include "exynos_drm_fb.h"
  25 #include "exynos_drm_fbdev.h"
  26 #include "exynos_drm_gem.h"
  27 #include "exynos_drm_iommu.h"
  28 #include "exynos_drm_crtc.h"
  29
  30 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  31
  32 /*
  33  * exynos specific framebuffer structure.
  34  *
  35  * @fb: drm framebuffer obejct.
  36  * @buf_cnt: a buffer count to drm framebuffer.
  37  * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
  38  */
  39 struct exynos_drm_fb {
  40         struct drm_framebuffer          fb;
  41         unsigned int                    buf_cnt;
  42         struct exynos_drm_gem_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  43 };
  44
  45 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  46                                 struct exynos_drm_gem_obj *exynos_gem_obj)
  47 {
  48         unsigned int flags;
  49
  50         /*
  51          * if exynos drm driver supports iommu then framebuffer can use
  52          * all the buffer types.
  53          */
  54         if (is_drm_iommu_supported(drm_dev))
  55                 return 0;
  56
  57         flags = exynos_gem_obj->flags;
  58
  59         /*
  60          * without iommu support, not support physically non-continuous memory
  61          * for framebuffer.
  62          */
  63         if (IS_NONCONTIG_BUFFER(flags)) {
  64                 DRM_ERROR("cannot use this gem memory type for fb.\n");
  65                 return -EINVAL;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  72 {
  73         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  74         unsigned int i;
  75
  76         /* make sure that overlay data are updated before relesing fb. */
  77         exynos_drm_crtc_complete_scanout(fb);
  78
  79         drm_framebuffer_cleanup(fb);
  80
  81         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  82                 struct drm_gem_object *obj;
  83
  84                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  85                         continue;
  86
  87                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  88                 drm_gem_object_unreference_unlocked(obj);
  89         }
  90
  91         kfree(exynos_fb);
  92         exynos_fb = NULL;
  93 }
  94
  95 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  96                                         struct drm_file *file_priv,
  97                                         unsigned int *handle)
  98 {
  99         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 100
 101         /* This fb should have only one gem object. */
 102         if (WARN_ON(exynos_fb->buf_cnt != 1))
 103                 return -EINVAL;
 104
 105         return drm_gem_handle_create(file_priv,
 106                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 107 }
 108
 109 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 110                                 struct drm_file *file_priv, unsigned flags,
 111                                 unsigned color, struct drm_clip_rect *clips,
 112                                 unsigned num_clips)
 113 {
 114         /* TODO */
 115
 116         return 0;
 117 }
 118
 119 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 120         .destroy        = exynos_drm_fb_destroy,
 121         .create_handle  = exynos_drm_fb_create_handle,
 122         .dirty          = exynos_drm_fb_dirty,
 123 };
 124
 125 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 126                                                 unsigned int cnt)
 127 {
 128         struct exynos_drm_fb *exynos_fb;
 129
 130         exynos_fb = to_exynos_fb(fb);
 131
 132         exynos_fb->buf_cnt = cnt;
 133 }
 134
 135 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 136 {
 137         struct exynos_drm_fb *exynos_fb;
 138
 139         exynos_fb = to_exynos_fb(fb);
 140
 141         return exynos_fb->buf_cnt;
 142 }
 143
 144 struct drm_framebuffer *
 145 exynos_drm_framebuffer_init(struct drm_device *dev,
 146                             struct drm_mode_fb_cmd2 *mode_cmd,
 147                             struct drm_gem_object *obj)
 148 {
 149         struct exynos_drm_fb *exynos_fb;
 150         struct exynos_drm_gem_obj *exynos_gem_obj;
 151         int ret;
 152
 153         exynos_gem_obj = to_exynos_gem_obj(obj);
 154
 155         ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 156         if (ret < 0)
 157                 return ERR_PTR(ret);
 158
 159         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 160         if (!exynos_fb)
 161                 return ERR_PTR(-ENOMEM);
 162
 163         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 164         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 165
 166         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 167         if (ret) {
 168                 kfree(exynos_fb);
 169                 DRM_ERROR("failed to initialize framebuffer\n");
 170                 return ERR_PTR(ret);
 171         }
 172
 173         return &exynos_fb->fb;
 174 }
 175
 176 static struct drm_framebuffer *
 177 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 178                       struct drm_mode_fb_cmd2 *mode_cmd)
 179 {
 180         struct drm_gem_object *obj;
 181         struct exynos_drm_gem_obj *exynos_gem_obj;
 182         struct exynos_drm_fb *exynos_fb;
 183         int i, ret;
 184
 185         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 186         if (!exynos_fb)
 187                 return ERR_PTR(-ENOMEM);
 188
 189         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 190         if (!obj) {
 191                 DRM_ERROR("failed to lookup gem object\n");
 192                 ret = -ENOENT;
 193                 goto err_free;
 194         }
 195
 196         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 197         exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
 198         exynos_fb->buf_cnt = drm_format_num_planes(mode_cmd->pixel_format);
 199
 200         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 201
 202         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 203                 obj = drm_gem_object_lookup(dev, file_priv,
 204                                 mode_cmd->handles[i]);
 205                 if (!obj) {
 206                         DRM_ERROR("failed to lookup gem object\n");
 207                         ret = -ENOENT;
 208                         exynos_fb->buf_cnt = i;
 209                         goto err_unreference;
 210                 }
 211
 212                 exynos_gem_obj = to_exynos_gem_obj(obj);
 213                 exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;
 214
 215                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 216                 if (ret < 0)
 217                         goto err_unreference;
 218         }
 219
 220         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 221         if (ret) {
 222                 DRM_ERROR("failed to init framebuffer.\n");
 223                 goto err_unreference;
 224         }
 225
 226         return &exynos_fb->fb;
 227
 228 err_unreference:
 229         for (i = 0; i < exynos_fb->buf_cnt; i++) {
 230                 struct drm_gem_object *obj;
 231
 232                 obj = &exynos_fb->exynos_gem_obj[i]->base;
 233                 if (obj)
 234                         drm_gem_object_unreference_unlocked(obj);
 235         }
 236 err_free:
 237         kfree(exynos_fb);
 238         return ERR_PTR(ret);
 239 }
 240
 241 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 242                                                 int index)
 243 {
 244         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 245         struct exynos_drm_gem_buf *buffer;
 246
 247         if (index >= MAX_FB_BUFFER)
 248                 return NULL;
 249
 250         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 251         if (!buffer)
 252                 return NULL;
 253
 254         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
 255
 256         return buffer;
 257 }
 258
 259 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 260 {
 261         struct exynos_drm_private *private = dev->dev_private;
 262         struct drm_fb_helper *fb_helper = private->fb_helper;
 263
 264         if (fb_helper)
 265                 drm_fb_helper_hotplug_event(fb_helper);
 266         else
 267                 exynos_drm_fbdev_init(dev);
 268 }
 269
 270 static int exynos_atomic_commit(struct drm_device *dev,
 271                                 struct drm_atomic_state *state,
 272                                 bool async)
 273 {
 274         int ret;
 275
 276         ret = drm_atomic_helper_prepare_planes(dev, state);
 277         if (ret)
 278                 return ret;
 279
 280         /* This is the point of no return */
 281
 282         drm_atomic_helper_swap_state(dev, state);
 283
 284         drm_atomic_helper_commit_modeset_disables(dev, state);
 285
 286         drm_atomic_helper_commit_modeset_enables(dev, state);
 287
 288         /*
 289          * Exynos can't update planes with CRTCs and encoders disabled,
 290          * its updates routines, specially for FIMD, requires the clocks
 291          * to be enabled. So it is necessary to handle the modeset operations
 292          * *before* the commit_planes() step, this way it will always
 293          * have the relevant clocks enabled to perform the update.
 294          */
 295
 296         drm_atomic_helper_commit_planes(dev, state);
 297
 298         drm_atomic_helper_cleanup_planes(dev, state);
 299
 300         drm_atomic_state_free(state);
 301
 302         return 0;
 303 }
 304
 305 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 306         .fb_create = exynos_user_fb_create,
 307         .output_poll_changed = exynos_drm_output_poll_changed,
 308         .atomic_check = drm_atomic_helper_check,
 309         .atomic_commit = exynos_atomic_commit,
 310 };
 311
 312 void exynos_drm_mode_config_init(struct drm_device *dev)
 313 {
 314         dev->mode_config.min_width = 0;
 315         dev->mode_config.min_height = 0;
 316
 317         /*
 318          * set max width and height as default value(4096x4096).
 319          * this value would be used to check framebuffer size limitation
 320          * at drm_mode_addfb().
 321          */
 322         dev->mode_config.max_width = 4096;
 323         dev->mode_config.max_height = 4096;
 324
 325         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 326 }