drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 /*
   4  * Copyright 2020 NXP
   5  */
   6
   7 #include <linux/firmware/imx/svc/misc.h>
   8 #include <linux/media-bus-format.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/regmap.h>
  17
  18 #include <drm/drm_atomic_state_helper.h>
  19 #include <drm/drm_bridge.h>
  20 #include <drm/drm_of.h>
  21 #include <drm/drm_print.h>
  22
  23 #include <dt-bindings/firmware/imx/rsrc.h>
  24
  25 #define PXL2DPI_CTRL    0x40
  26 #define  CFG1_16BIT     0x0
  27 #define  CFG2_16BIT     0x1
  28 #define  CFG3_16BIT     0x2
  29 #define  CFG1_18BIT     0x3
  30 #define  CFG2_18BIT     0x4
  31 #define  CFG_24BIT      0x5
  32
  33 #define DRIVER_NAME     "imx8qxp-pxl2dpi"
  34
  35 struct imx8qxp_pxl2dpi {
  36         struct regmap *regmap;
  37         struct drm_bridge bridge;
  38         struct drm_bridge *next_bridge;
  39         struct drm_bridge *companion;
  40         struct device *dev;
  41         struct imx_sc_ipc *ipc_handle;
  42         u32 sc_resource;
  43         u32 in_bus_format;
  44         u32 out_bus_format;
  45         u32 pl_sel;
  46 };
  47
  48 #define bridge_to_p2d(b)        container_of(b, struct imx8qxp_pxl2dpi, bridge)
  49
  50 static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
  51                                          enum drm_bridge_attach_flags flags)
  52 {
  53         struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
  54
  55         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
  56                 DRM_DEV_ERROR(p2d->dev,
  57                               "do not support creating a drm_connector\n");
  58                 return -EINVAL;
  59         }
  60
  61         if (!bridge->encoder) {
  62                 DRM_DEV_ERROR(p2d->dev, "missing encoder\n");
  63                 return -ENODEV;
  64         }
  65
  66         return drm_bridge_attach(bridge->encoder,
  67                                  p2d->next_bridge, bridge,
  68                                  DRM_BRIDGE_ATTACH_NO_CONNECTOR);
  69 }
  70
  71 static int
  72 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
  73                                     struct drm_bridge_state *bridge_state,
  74                                     struct drm_crtc_state *crtc_state,
  75                                     struct drm_connector_state *conn_state)
  76 {
  77         struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
  78
  79         p2d->in_bus_format = bridge_state->input_bus_cfg.format;
  80         p2d->out_bus_format = bridge_state->output_bus_cfg.format;
  81
  82         return 0;
  83 }
  84
  85 static void
  86 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
  87                                 const struct drm_display_mode *mode,
  88                                 const struct drm_display_mode *adjusted_mode)
  89 {
  90         struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
  91         struct imx8qxp_pxl2dpi *companion_p2d;
  92         int ret;
  93
  94         ret = pm_runtime_get_sync(p2d->dev);
  95         if (ret < 0)
  96                 DRM_DEV_ERROR(p2d->dev,
  97                               "failed to get runtime PM sync: %d\n", ret);
  98
  99         ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
 100                                       IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
 101         if (ret)
 102                 DRM_DEV_ERROR(p2d->dev,
 103                               "failed to set pixel link selection(%u): %d\n",
 104                                                         p2d->pl_sel, ret);
 105
 106         switch (p2d->out_bus_format) {
 107         case MEDIA_BUS_FMT_RGB888_1X24:
 108                 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
 109                 break;
 110         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 111                 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
 112                 break;
 113         default:
 114                 DRM_DEV_ERROR(p2d->dev,
 115                               "unsupported output bus format 0x%08x\n",
 116                                                         p2d->out_bus_format);
 117         }
 118
 119         if (p2d->companion) {
 120                 companion_p2d = bridge_to_p2d(p2d->companion);
 121
 122                 companion_p2d->in_bus_format = p2d->in_bus_format;
 123                 companion_p2d->out_bus_format = p2d->out_bus_format;
 124
 125                 p2d->companion->funcs->mode_set(p2d->companion, mode,
 126                                                         adjusted_mode);
 127         }
 128 }
 129
 130 static void
 131 imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
 132                                       struct drm_bridge_state *old_bridge_state)
 133 {
 134         struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
 135         int ret;
 136
 137         ret = pm_runtime_put(p2d->dev);
 138         if (ret < 0)
 139                 DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
 140
 141         if (p2d->companion)
 142                 p2d->companion->funcs->atomic_disable(p2d->companion,
 143                                                         old_bridge_state);
 144 }
 145
 146 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
 147         MEDIA_BUS_FMT_RGB888_1X24,
 148         MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
 149 };
 150
 151 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
 152 {
 153         int i;
 154
 155         for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
 156                 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
 157                         return true;
 158         }
 159
 160         return false;
 161 }
 162
 163 static u32 *
 164 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 165                                                  struct drm_bridge_state *bridge_state,
 166                                                  struct drm_crtc_state *crtc_state,
 167                                                  struct drm_connector_state *conn_state,
 168                                                  u32 output_fmt,
 169                                                  unsigned int *num_input_fmts)
 170 {
 171         u32 *input_fmts;
 172
 173         if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
 174                 return NULL;
 175
 176         *num_input_fmts = 1;
 177
 178         input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
 179         if (!input_fmts)
 180                 return NULL;
 181
 182         switch (output_fmt) {
 183         case MEDIA_BUS_FMT_RGB888_1X24:
 184                 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
 185                 break;
 186         case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
 187                 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
 188                 break;
 189         default:
 190                 kfree(input_fmts);
 191                 input_fmts = NULL;
 192                 break;
 193         }
 194
 195         return input_fmts;
 196 }
 197
 198 static u32 *
 199 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
 200                                                   struct drm_bridge_state *bridge_state,
 201                                                   struct drm_crtc_state *crtc_state,
 202                                                   struct drm_connector_state *conn_state,
 203                                                   unsigned int *num_output_fmts)
 204 {
 205         *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
 206         return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
 207                         sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
 208 }
 209
 210 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
 211         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 212         .atomic_destroy_state   = drm_atomic_helper_bridge_destroy_state,
 213         .atomic_reset           = drm_atomic_helper_bridge_reset,
 214         .attach                 = imx8qxp_pxl2dpi_bridge_attach,
 215         .atomic_check           = imx8qxp_pxl2dpi_bridge_atomic_check,
 216         .mode_set               = imx8qxp_pxl2dpi_bridge_mode_set,
 217         .atomic_disable         = imx8qxp_pxl2dpi_bridge_atomic_disable,
 218         .atomic_get_input_bus_fmts =
 219                         imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
 220         .atomic_get_output_bus_fmts =
 221                         imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
 222 };
 223
 224 static struct device_node *
 225 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
 226                                            u32 port_id)
 227 {
 228         struct device_node *port, *ep;
 229         int ep_cnt;
 230
 231         port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
 232         if (!port) {
 233                 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
 234                 return ERR_PTR(-ENODEV);
 235         }
 236
 237         ep_cnt = of_get_available_child_count(port);
 238         if (ep_cnt == 0) {
 239                 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
 240                               port_id);
 241                 ep = ERR_PTR(-ENODEV);
 242                 goto out;
 243         } else if (ep_cnt > 1) {
 244                 DRM_DEV_ERROR(p2d->dev,
 245                               "invalid available endpoints of port@%u\n",
 246                               port_id);
 247                 ep = ERR_PTR(-EINVAL);
 248                 goto out;
 249         }
 250
 251         ep = of_get_next_available_child(port, NULL);
 252         if (!ep) {
 253                 DRM_DEV_ERROR(p2d->dev,
 254                               "failed to get available endpoint of port@%u\n",
 255                               port_id);
 256                 ep = ERR_PTR(-ENODEV);
 257                 goto out;
 258         }
 259 out:
 260         of_node_put(port);
 261         return ep;
 262 }
 263
 264 static struct drm_bridge *
 265 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
 266 {
 267         struct device_node *ep, *remote;
 268         struct drm_bridge *next_bridge;
 269         int ret;
 270
 271         ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
 272         if (IS_ERR(ep)) {
 273                 ret = PTR_ERR(ep);
 274                 return ERR_PTR(ret);
 275         }
 276
 277         remote = of_graph_get_remote_port_parent(ep);
 278         if (!remote || !of_device_is_available(remote)) {
 279                 DRM_DEV_ERROR(p2d->dev, "no available remote\n");
 280                 next_bridge = ERR_PTR(-ENODEV);
 281                 goto out;
 282         } else if (!of_device_is_available(remote->parent)) {
 283                 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
 284                 next_bridge = ERR_PTR(-ENODEV);
 285                 goto out;
 286         }
 287
 288         next_bridge = of_drm_find_bridge(remote);
 289         if (!next_bridge) {
 290                 next_bridge = ERR_PTR(-EPROBE_DEFER);
 291                 goto out;
 292         }
 293 out:
 294         of_node_put(remote);
 295         of_node_put(ep);
 296
 297         return next_bridge;
 298 }
 299
 300 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
 301 {
 302         struct device_node *ep;
 303         struct of_endpoint endpoint;
 304         int ret;
 305
 306         ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
 307         if (IS_ERR(ep))
 308                 return PTR_ERR(ep);
 309
 310         ret = of_graph_parse_endpoint(ep, &endpoint);
 311         if (ret) {
 312                 DRM_DEV_ERROR(p2d->dev,
 313                               "failed to parse endpoint of port@0: %d\n", ret);
 314                 goto out;
 315         }
 316
 317         p2d->pl_sel = endpoint.id;
 318 out:
 319         of_node_put(ep);
 320
 321         return ret;
 322 }
 323
 324 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
 325 {
 326         struct imx8qxp_pxl2dpi *companion_p2d;
 327         struct device *dev = p2d->dev;
 328         struct device_node *companion;
 329         struct device_node *port1, *port2;
 330         const struct of_device_id *match;
 331         int dual_link;
 332         int ret = 0;
 333
 334         /* Locate the companion PXL2DPI for dual-link operation, if any. */
 335         companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
 336         if (!companion)
 337                 return 0;
 338
 339         if (!of_device_is_available(companion)) {
 340                 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
 341                 ret = -ENODEV;
 342                 goto out;
 343         }
 344
 345         /*
 346          * Sanity check: the companion bridge must have the same compatible
 347          * string.
 348          */
 349         match = of_match_device(dev->driver->of_match_table, dev);
 350         if (!of_device_is_compatible(companion, match->compatible)) {
 351                 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
 352                 ret = -ENXIO;
 353                 goto out;
 354         }
 355
 356         p2d->companion = of_drm_find_bridge(companion);
 357         if (!p2d->companion) {
 358                 ret = -EPROBE_DEFER;
 359                 DRM_DEV_DEBUG_DRIVER(p2d->dev,
 360                                      "failed to find companion bridge: %d\n",
 361                                      ret);
 362                 goto out;
 363         }
 364
 365         companion_p2d = bridge_to_p2d(p2d->companion);
 366
 367         /*
 368          * We need to work out if the sink is expecting us to function in
 369          * dual-link mode.  We do this by looking at the DT port nodes that
 370          * the next bridges are connected to.  If they are marked as expecting
 371          * even pixels and odd pixels than we need to use the companion PXL2DPI.
 372          */
 373         port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
 374         port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
 375         dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
 376         of_node_put(port1);
 377         of_node_put(port2);
 378
 379         if (dual_link < 0) {
 380                 ret = dual_link;
 381                 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
 382                               ret);
 383                 goto out;
 384         }
 385
 386         DRM_DEV_DEBUG_DRIVER(dev,
 387                              "dual-link configuration detected (companion bridge %pOF)\n",
 388                              companion);
 389 out:
 390         of_node_put(companion);
 391         return ret;
 392 }
 393
 394 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
 395 {
 396         struct imx8qxp_pxl2dpi *p2d;
 397         struct device *dev = &pdev->dev;
 398         struct device_node *np = dev->of_node;
 399         int ret;
 400
 401         p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
 402         if (!p2d)
 403                 return -ENOMEM;
 404
 405         p2d->regmap = syscon_node_to_regmap(np->parent);
 406         if (IS_ERR(p2d->regmap)) {
 407                 ret = PTR_ERR(p2d->regmap);
 408                 if (ret != -EPROBE_DEFER)
 409                         DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
 410                 return ret;
 411         }
 412
 413         ret = imx_scu_get_handle(&p2d->ipc_handle);
 414         if (ret) {
 415                 if (ret != -EPROBE_DEFER)
 416                         DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
 417                                       ret);
 418                 return ret;
 419         }
 420
 421         p2d->dev = dev;
 422
 423         ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
 424         if (ret) {
 425                 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
 426                 return ret;
 427         }
 428
 429         p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
 430         if (IS_ERR(p2d->next_bridge)) {
 431                 ret = PTR_ERR(p2d->next_bridge);
 432                 if (ret != -EPROBE_DEFER)
 433                         DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
 434                                       ret);
 435                 return ret;
 436         }
 437
 438         ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
 439         if (ret)
 440                 return ret;
 441
 442         ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
 443         if (ret)
 444                 return ret;
 445
 446         platform_set_drvdata(pdev, p2d);
 447         pm_runtime_enable(dev);
 448
 449         p2d->bridge.driver_private = p2d;
 450         p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
 451         p2d->bridge.of_node = np;
 452
 453         drm_bridge_add(&p2d->bridge);
 454
 455         return ret;
 456 }
 457
 458 static int imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
 459 {
 460         struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
 461
 462         drm_bridge_remove(&p2d->bridge);
 463
 464         pm_runtime_disable(&pdev->dev);
 465
 466         return 0;
 467 }
 468
 469 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
 470         { .compatible = "fsl,imx8qxp-pxl2dpi", },
 471         { /* sentinel */ }
 472 };
 473 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
 474
 475 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
 476         .probe  = imx8qxp_pxl2dpi_bridge_probe,
 477         .remove = imx8qxp_pxl2dpi_bridge_remove,
 478         .driver = {
 479                 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
 480                 .name = DRIVER_NAME,
 481         },
 482 };
 483 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
 484
 485 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
 486 MODULE_AUTHOR("Liu Ying <[email protected]>");
 487 MODULE_LICENSE("GPL v2");
 488 MODULE_ALIAS("platform:" DRIVER_NAME);