drivers/gpu/drm/sun4i/sun4i_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2015 Free Electrons
   4  * Copyright (C) 2015 NextThing Co
   5  *
   6  * Maxime Ripard <maxime.ripard@free-electrons.com>
   7  */
   8
   9 #include <linux/component.h>
  10 #include <linux/kfifo.h>
  11 #include <linux/module.h>
  12 #include <linux/of_graph.h>
  13 #include <linux/of_reserved_mem.h>
  14 #include <linux/platform_device.h>
  15
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_drv.h>
  18 #include <drm/drm_fb_cma_helper.h>
  19 #include <drm/drm_fb_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_of.h>
  22 #include <drm/drm_probe_helper.h>
  23 #include <drm/drm_vblank.h>
  24
  25 #include "sun4i_drv.h"
  26 #include "sun4i_frontend.h"
  27 #include "sun4i_framebuffer.h"
  28 #include "sun4i_tcon.h"
  29 #include "sun8i_tcon_top.h"
  30
  31 static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
  32                                      struct drm_device *drm,
  33                                      struct drm_mode_create_dumb *args)
  34 {
  35         /* The hardware only allows even pitches for YUV buffers. */
  36         args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
  37
  38         return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
  39 }
  40
  41 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
  42
  43 static struct drm_driver sun4i_drv_driver = {
  44         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  45
  46         /* Generic Operations */
  47         .fops                   = &sun4i_drv_fops,
  48         .name                   = "sun4i-drm",
  49         .desc                   = "Allwinner sun4i Display Engine",
  50         .date                   = "20150629",
  51         .major                  = 1,
  52         .minor                  = 0,
  53
  54         /* GEM Operations */
  55         DRM_GEM_CMA_VMAP_DRIVER_OPS,
  56         .dumb_create            = drm_sun4i_gem_dumb_create,
  57 };
  58
  59 static int sun4i_drv_bind(struct device *dev)
  60 {
  61         struct drm_device *drm;
  62         struct sun4i_drv *drv;
  63         int ret;
  64
  65         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  66         if (IS_ERR(drm))
  67                 return PTR_ERR(drm);
  68
  69         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  70         if (!drv) {
  71                 ret = -ENOMEM;
  72                 goto free_drm;
  73         }
  74
  75         dev_set_drvdata(dev, drm);
  76         drm->dev_private = drv;
  77         INIT_LIST_HEAD(&drv->frontend_list);
  78         INIT_LIST_HEAD(&drv->engine_list);
  79         INIT_LIST_HEAD(&drv->tcon_list);
  80
  81         ret = of_reserved_mem_device_init(dev);
  82         if (ret && ret != -ENODEV) {
  83                 dev_err(drm->dev, "Couldn't claim our memory region\n");
  84                 goto free_drm;
  85         }
  86
  87         drm_mode_config_init(drm);
  88         drm->mode_config.allow_fb_modifiers = true;
  89
  90         ret = component_bind_all(drm->dev, drm);
  91         if (ret) {
  92                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
  93                 goto cleanup_mode_config;
  94         }
  95
  96         /* drm_vblank_init calls kcalloc, which can fail */
  97         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
  98         if (ret)
  99                 goto cleanup_mode_config;
 100
 101         drm->irq_enabled = true;
 102
 103         /* Remove early framebuffers (ie. simplefb) */
 104         drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 105
 106         sun4i_framebuffer_init(drm);
 107
 108         /* Enable connectors polling */
 109         drm_kms_helper_poll_init(drm);
 110
 111         ret = drm_dev_register(drm, 0);
 112         if (ret)
 113                 goto finish_poll;
 114
 115         drm_fbdev_generic_setup(drm, 32);
 116
 117         return 0;
 118
 119 finish_poll:
 120         drm_kms_helper_poll_fini(drm);
 121 cleanup_mode_config:
 122         drm_mode_config_cleanup(drm);
 123         of_reserved_mem_device_release(dev);
 124 free_drm:
 125         drm_dev_put(drm);
 126         return ret;
 127 }
 128
 129 static void sun4i_drv_unbind(struct device *dev)
 130 {
 131         struct drm_device *drm = dev_get_drvdata(dev);
 132
 133         drm_dev_unregister(drm);
 134         drm_kms_helper_poll_fini(drm);
 135         drm_atomic_helper_shutdown(drm);
 136         drm_mode_config_cleanup(drm);
 137
 138         component_unbind_all(dev, NULL);
 139         of_reserved_mem_device_release(dev);
 140
 141         drm_dev_put(drm);
 142 }
 143
 144 static const struct component_master_ops sun4i_drv_master_ops = {
 145         .bind   = sun4i_drv_bind,
 146         .unbind = sun4i_drv_unbind,
 147 };
 148
 149 static bool sun4i_drv_node_is_connector(struct device_node *node)
 150 {
 151         return of_device_is_compatible(node, "hdmi-connector");
 152 }
 153
 154 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 155 {
 156         return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
 157                 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 158                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 159                 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
 160                 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
 161                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
 162                 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
 163 }
 164
 165 static bool sun4i_drv_node_is_deu(struct device_node *node)
 166 {
 167         return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
 168 }
 169
 170 static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
 171 {
 172         if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
 173                 return !!of_match_node(sun4i_frontend_of_table, node);
 174
 175         return false;
 176 }
 177
 178 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 179 {
 180         return !!of_match_node(sun4i_tcon_of_table, node);
 181 }
 182
 183 static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
 184 {
 185         const struct of_device_id *match;
 186
 187         match = of_match_node(sun4i_tcon_of_table, node);
 188         if (match) {
 189                 struct sun4i_tcon_quirks *quirks;
 190
 191                 quirks = (struct sun4i_tcon_quirks *)match->data;
 192
 193                 return quirks->has_channel_0;
 194         }
 195
 196         return false;
 197 }
 198
 199 static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 200 {
 201         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
 202                 !!of_match_node(sun8i_tcon_top_of_table, node);
 203 }
 204
 205 static int compare_of(struct device *dev, void *data)
 206 {
 207         DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
 208                          dev->of_node,
 209                          data);
 210
 211         return dev->of_node == data;
 212 }
 213
 214 /*
 215  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 216  * crtcs from the device tree using of_graph. For the results to be
 217  * correct, encoders must be probed/bound after _all_ crtcs have been
 218  * created. The existing code uses a depth first recursive traversal
 219  * of the of_graph, which means the encoders downstream of the TCON
 220  * get add right after the first TCON. The second TCON or CRTC will
 221  * never be properly associated with encoders connected to it.
 222  *
 223  * Also, in a dual display pipeline setup, both frontends can feed
 224  * either backend, and both backends can feed either TCON, we want
 225  * all components of the same type to be added before the next type
 226  * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 227  * i.e. components of the same type are at the same depth when counted
 228  * from the frontend. The only exception is the third pipeline in
 229  * the A80 SoC, which we do not support anyway.
 230  *
 231  * Hence we can use a breadth first search traversal order to add
 232  * components. We do not need to check for duplicates. The component
 233  * matching system handles this for us.
 234  */
 235 struct endpoint_list {
 236         DECLARE_KFIFO(fifo, struct device_node *, 16);
 237 };
 238
 239 static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 240                                          struct device_node *node,
 241                                          int port_id)
 242 {
 243         struct device_node *ep, *remote, *port;
 244
 245         port = of_graph_get_port_by_id(node, port_id);
 246         if (!port) {
 247                 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
 248                 return;
 249         }
 250
 251         for_each_available_child_of_node(port, ep) {
 252                 remote = of_graph_get_remote_port_parent(ep);
 253                 if (!remote) {
 254                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 255                         continue;
 256                 }
 257
 258                 if (sun4i_drv_node_is_tcon(node)) {
 259                         /*
 260                          * TCON TOP is always probed before TCON. However, TCON
 261                          * points back to TCON TOP when it is source for HDMI.
 262                          * We have to skip it here to prevent infinite looping
 263                          * between TCON TOP and TCON.
 264                          */
 265                         if (sun4i_drv_node_is_tcon_top(remote)) {
 266                                 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
 267                                 of_node_put(remote);
 268                                 continue;
 269                         }
 270
 271                         /*
 272                          * If the node is our TCON with channel 0, the first
 273                          * port is used for panel or bridges, and will not be
 274                          * part of the component framework.
 275                          */
 276                         if (sun4i_drv_node_is_tcon_with_ch0(node)) {
 277                                 struct of_endpoint endpoint;
 278
 279                                 if (of_graph_parse_endpoint(ep, &endpoint)) {
 280                                         DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 281                                         of_node_put(remote);
 282                                         continue;
 283                                 }
 284
 285                                 if (!endpoint.id) {
 286                                         DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 287                                         of_node_put(remote);
 288                                         continue;
 289                                 }
 290                         }
 291                 }
 292
 293                 kfifo_put(&list->fifo, remote);
 294         }
 295 }
 296
 297 static int sun4i_drv_add_endpoints(struct device *dev,
 298                                    struct endpoint_list *list,
 299                                    struct component_match **match,
 300                                    struct device_node *node)
 301 {
 302         int count = 0;
 303
 304         /*
 305          * The frontend has been disabled in some of our old device
 306          * trees. If we find a node that is the frontend and is
 307          * disabled, we should just follow through and parse its
 308          * child, but without adding it to the component list.
 309          * Otherwise, we obviously want to add it to the list.
 310          */
 311         if (!sun4i_drv_node_is_frontend(node) &&
 312             !of_device_is_available(node))
 313                 return 0;
 314
 315         /*
 316          * The connectors will be the last nodes in our pipeline, we
 317          * can just bail out.
 318          */
 319         if (sun4i_drv_node_is_connector(node))
 320                 return 0;
 321
 322         /*
 323          * If the device is either just a regular device, or an
 324          * enabled frontend supported by the driver, we add it to our
 325          * component list.
 326          */
 327         if (!(sun4i_drv_node_is_frontend(node) ||
 328               sun4i_drv_node_is_deu(node)) ||
 329             (sun4i_drv_node_is_supported_frontend(node) &&
 330              of_device_is_available(node))) {
 331                 /* Add current component */
 332                 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
 333                 drm_of_component_match_add(dev, match, compare_of, node);
 334                 count++;
 335         }
 336
 337         /* each node has at least one output */
 338         sun4i_drv_traverse_endpoints(list, node, 1);
 339
 340         /* TCON TOP has second and third output */
 341         if (sun4i_drv_node_is_tcon_top(node)) {
 342                 sun4i_drv_traverse_endpoints(list, node, 3);
 343                 sun4i_drv_traverse_endpoints(list, node, 5);
 344         }
 345
 346         return count;
 347 }
 348
 349 #ifdef CONFIG_PM_SLEEP
 350 static int sun4i_drv_drm_sys_suspend(struct device *dev)
 351 {
 352         struct drm_device *drm = dev_get_drvdata(dev);
 353
 354         return drm_mode_config_helper_suspend(drm);
 355 }
 356
 357 static int sun4i_drv_drm_sys_resume(struct device *dev)
 358 {
 359         struct drm_device *drm = dev_get_drvdata(dev);
 360
 361         return drm_mode_config_helper_resume(drm);
 362 }
 363 #endif
 364
 365 static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
 366         SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
 367                                 sun4i_drv_drm_sys_resume)
 368 };
 369
 370 static int sun4i_drv_probe(struct platform_device *pdev)
 371 {
 372         struct component_match *match = NULL;
 373         struct device_node *np = pdev->dev.of_node, *endpoint;
 374         struct endpoint_list list;
 375         int i, ret, count = 0;
 376
 377         INIT_KFIFO(list.fifo);
 378
 379         for (i = 0;; i++) {
 380                 struct device_node *pipeline = of_parse_phandle(np,
 381                                                                 "allwinner,pipelines",
 382                                                                 i);
 383                 if (!pipeline)
 384                         break;
 385
 386                 kfifo_put(&list.fifo, pipeline);
 387         }
 388
 389         while (kfifo_get(&list.fifo, &endpoint)) {
 390                 /* process this endpoint */
 391                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 392                                               endpoint);
 393
 394                 /* sun4i_drv_add_endpoints can fail to allocate memory */
 395                 if (ret < 0)
 396                         return ret;
 397
 398                 count += ret;
 399         }
 400
 401         if (count)
 402                 return component_master_add_with_match(&pdev->dev,
 403                                                        &sun4i_drv_master_ops,
 404                                                        match);
 405         else
 406                 return 0;
 407 }
 408
 409 static int sun4i_drv_remove(struct platform_device *pdev)
 410 {
 411         component_master_del(&pdev->dev, &sun4i_drv_master_ops);
 412
 413         return 0;
 414 }
 415
 416 static const struct of_device_id sun4i_drv_of_table[] = {
 417         { .compatible = "allwinner,sun4i-a10-display-engine" },
 418         { .compatible = "allwinner,sun5i-a10s-display-engine" },
 419         { .compatible = "allwinner,sun5i-a13-display-engine" },
 420         { .compatible = "allwinner,sun6i-a31-display-engine" },
 421         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 422         { .compatible = "allwinner,sun7i-a20-display-engine" },
 423         { .compatible = "allwinner,sun8i-a23-display-engine" },
 424         { .compatible = "allwinner,sun8i-a33-display-engine" },
 425         { .compatible = "allwinner,sun8i-a83t-display-engine" },
 426         { .compatible = "allwinner,sun8i-h3-display-engine" },
 427         { .compatible = "allwinner,sun8i-r40-display-engine" },
 428         { .compatible = "allwinner,sun8i-v3s-display-engine" },
 429         { .compatible = "allwinner,sun9i-a80-display-engine" },
 430         { .compatible = "allwinner,sun50i-a64-display-engine" },
 431         { .compatible = "allwinner,sun50i-h6-display-engine" },
 432         { }
 433 };
 434 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 435
 436 static struct platform_driver sun4i_drv_platform_driver = {
 437         .probe          = sun4i_drv_probe,
 438         .remove         = sun4i_drv_remove,
 439         .driver         = {
 440                 .name           = "sun4i-drm",
 441                 .of_match_table = sun4i_drv_of_table,
 442                 .pm = &sun4i_drv_drm_pm_ops,
 443         },
 444 };
 445 module_platform_driver(sun4i_drv_platform_driver);
 446
 447 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 448 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 449 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 450 MODULE_LICENSE("GPL");