drivers/gpu/drm/imx/parallel-display.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * i.MX drm driver - parallel display implementation
   4  *
   5  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   6  */
   7
   8 #include <linux/component.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/videodev2.h>
  12
  13 #include <video/of_display_timing.h>
  14
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_bridge.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_of.h>
  19 #include <drm/drm_panel.h>
  20 #include <drm/drm_probe_helper.h>
  21
  22 #include "imx-drm.h"
  23
  24 struct imx_parallel_display {
  25         struct drm_connector connector;
  26         struct drm_encoder encoder;
  27         struct drm_bridge bridge;
  28         struct device *dev;
  29         void *edid;
  30         int edid_len;
  31         u32 bus_format;
  32         u32 bus_flags;
  33         struct drm_display_mode mode;
  34         struct drm_panel *panel;
  35         struct drm_bridge *next_bridge;
  36 };
  37
  38 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
  39 {
  40         return container_of(c, struct imx_parallel_display, connector);
  41 }
  42
  43 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
  44 {
  45         return container_of(e, struct imx_parallel_display, encoder);
  46 }
  47
  48 static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
  49 {
  50         return container_of(b, struct imx_parallel_display, bridge);
  51 }
  52
  53 static int imx_pd_connector_get_modes(struct drm_connector *connector)
  54 {
  55         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  56         struct device_node *np = imxpd->dev->of_node;
  57         int num_modes;
  58
  59         num_modes = drm_panel_get_modes(imxpd->panel, connector);
  60         if (num_modes > 0)
  61                 return num_modes;
  62
  63         if (imxpd->edid) {
  64                 drm_connector_update_edid_property(connector, imxpd->edid);
  65                 num_modes = drm_add_edid_modes(connector, imxpd->edid);
  66         }
  67
  68         if (np) {
  69                 struct drm_display_mode *mode = drm_mode_create(connector->dev);
  70                 int ret;
  71
  72                 if (!mode)
  73                         return -EINVAL;
  74
  75                 ret = of_get_drm_display_mode(np, &imxpd->mode,
  76                                               &imxpd->bus_flags,
  77                                               OF_USE_NATIVE_MODE);
  78                 if (ret)
  79                         return ret;
  80
  81                 drm_mode_copy(mode, &imxpd->mode);
  82                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
  83                 drm_mode_probed_add(connector, mode);
  84                 num_modes++;
  85         }
  86
  87         return num_modes;
  88 }
  89
  90 static struct drm_encoder *imx_pd_connector_best_encoder(
  91                 struct drm_connector *connector)
  92 {
  93         struct imx_parallel_display *imxpd = con_to_imxpd(connector);
  94
  95         return &imxpd->encoder;
  96 }
  97
  98 static void imx_pd_bridge_enable(struct drm_bridge *bridge)
  99 {
 100         struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 101
 102         drm_panel_prepare(imxpd->panel);
 103         drm_panel_enable(imxpd->panel);
 104 }
 105
 106 static void imx_pd_bridge_disable(struct drm_bridge *bridge)
 107 {
 108         struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 109
 110         drm_panel_disable(imxpd->panel);
 111         drm_panel_unprepare(imxpd->panel);
 112 }
 113
 114 static const u32 imx_pd_bus_fmts[] = {
 115         MEDIA_BUS_FMT_RGB888_1X24,
 116         MEDIA_BUS_FMT_BGR888_1X24,
 117         MEDIA_BUS_FMT_GBR888_1X24,
 118         MEDIA_BUS_FMT_RGB666_1X18,
 119         MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
 120         MEDIA_BUS_FMT_RGB565_1X16,
 121 };
 122
 123 static u32 *
 124 imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
 125                                          struct drm_bridge_state *bridge_state,
 126                                          struct drm_crtc_state *crtc_state,
 127                                          struct drm_connector_state *conn_state,
 128                                          unsigned int *num_output_fmts)
 129 {
 130         struct drm_display_info *di = &conn_state->connector->display_info;
 131         struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 132         u32 *output_fmts;
 133
 134         if (!imxpd->bus_format && !di->num_bus_formats) {
 135                 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
 136                 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
 137                                GFP_KERNEL);
 138         }
 139
 140         *num_output_fmts = 1;
 141         output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
 142         if (!output_fmts)
 143                 return NULL;
 144
 145         if (!imxpd->bus_format && di->num_bus_formats)
 146                 output_fmts[0] = di->bus_formats[0];
 147         else
 148                 output_fmts[0] = imxpd->bus_format;
 149
 150         return output_fmts;
 151 }
 152
 153 static bool imx_pd_format_supported(u32 output_fmt)
 154 {
 155         unsigned int i;
 156
 157         for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
 158                 if (imx_pd_bus_fmts[i] == output_fmt)
 159                         return true;
 160         }
 161
 162         return false;
 163 }
 164
 165 static u32 *
 166 imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 167                                         struct drm_bridge_state *bridge_state,
 168                                         struct drm_crtc_state *crtc_state,
 169                                         struct drm_connector_state *conn_state,
 170                                         u32 output_fmt,
 171                                         unsigned int *num_input_fmts)
 172 {
 173         struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 174         u32 *input_fmts;
 175
 176         /*
 177          * If the next bridge does not support bus format negotiation, let's
 178          * use the static bus format definition (imxpd->bus_format) if it's
 179          * specified, RGB888 when it's not.
 180          */
 181         if (output_fmt == MEDIA_BUS_FMT_FIXED)
 182                 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
 183
 184         /* Now make sure the requested output format is supported. */
 185         if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
 186             !imx_pd_format_supported(output_fmt)) {
 187                 *num_input_fmts = 0;
 188                 return NULL;
 189         }
 190
 191         *num_input_fmts = 1;
 192         input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
 193         if (!input_fmts)
 194                 return NULL;
 195
 196         input_fmts[0] = output_fmt;
 197         return input_fmts;
 198 }
 199
 200 static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
 201                                       struct drm_bridge_state *bridge_state,
 202                                       struct drm_crtc_state *crtc_state,
 203                                       struct drm_connector_state *conn_state)
 204 {
 205         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 206         struct drm_display_info *di = &conn_state->connector->display_info;
 207         struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
 208         struct drm_bridge_state *next_bridge_state = NULL;
 209         struct drm_bridge *next_bridge;
 210         u32 bus_flags, bus_fmt;
 211
 212         next_bridge = drm_bridge_get_next_bridge(bridge);
 213         if (next_bridge)
 214                 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
 215                                                                     next_bridge);
 216
 217         if (next_bridge_state)
 218                 bus_flags = next_bridge_state->input_bus_cfg.flags;
 219         else if (!imxpd->bus_format && di->num_bus_formats)
 220                 bus_flags = di->bus_flags;
 221         else
 222                 bus_flags = imxpd->bus_flags;
 223
 224         bus_fmt = bridge_state->input_bus_cfg.format;
 225         if (!imx_pd_format_supported(bus_fmt))
 226                 return -EINVAL;
 227
 228         if (bus_flags &
 229             ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
 230               DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
 231               DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
 232                 dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
 233                 return -EINVAL;
 234         }
 235
 236         bridge_state->output_bus_cfg.flags = bus_flags;
 237         bridge_state->input_bus_cfg.flags = bus_flags;
 238         imx_crtc_state->bus_flags = bus_flags;
 239         imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
 240         imx_crtc_state->di_hsync_pin = 2;
 241         imx_crtc_state->di_vsync_pin = 3;
 242
 243         return 0;
 244 }
 245
 246 static const struct drm_connector_funcs imx_pd_connector_funcs = {
 247         .fill_modes = drm_helper_probe_single_connector_modes,
 248         .destroy = imx_drm_connector_destroy,
 249         .reset = drm_atomic_helper_connector_reset,
 250         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 251         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 252 };
 253
 254 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 255         .get_modes = imx_pd_connector_get_modes,
 256         .best_encoder = imx_pd_connector_best_encoder,
 257 };
 258
 259 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
 260         .destroy = imx_drm_encoder_destroy,
 261 };
 262
 263 static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
 264         .enable = imx_pd_bridge_enable,
 265         .disable = imx_pd_bridge_disable,
 266         .atomic_reset = drm_atomic_helper_bridge_reset,
 267         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 268         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 269         .atomic_check = imx_pd_bridge_atomic_check,
 270         .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
 271         .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
 272 };
 273
 274 static int imx_pd_register(struct drm_device *drm,
 275         struct imx_parallel_display *imxpd)
 276 {
 277         struct drm_encoder *encoder = &imxpd->encoder;
 278         int ret;
 279
 280         ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
 281         if (ret)
 282                 return ret;
 283
 284         /* set the connector's dpms to OFF so that
 285          * drm_helper_connector_dpms() won't return
 286          * immediately since the current state is ON
 287          * at this point.
 288          */
 289         imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
 290
 291         drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
 292                          DRM_MODE_ENCODER_NONE, NULL);
 293
 294         imxpd->bridge.funcs = &imx_pd_bridge_funcs;
 295         drm_bridge_attach(encoder, &imxpd->bridge, NULL, 0);
 296
 297         if (!imxpd->next_bridge) {
 298                 drm_connector_helper_add(&imxpd->connector,
 299                                 &imx_pd_connector_helper_funcs);
 300                 drm_connector_init(drm, &imxpd->connector,
 301                                    &imx_pd_connector_funcs,
 302                                    DRM_MODE_CONNECTOR_DPI);
 303         }
 304
 305         if (imxpd->panel)
 306                 drm_panel_attach(imxpd->panel, &imxpd->connector);
 307
 308         if (imxpd->next_bridge) {
 309                 ret = drm_bridge_attach(encoder, imxpd->next_bridge,
 310                                         &imxpd->bridge, 0);
 311                 if (ret < 0) {
 312                         dev_err(imxpd->dev, "failed to attach bridge: %d\n",
 313                                 ret);
 314                         return ret;
 315                 }
 316         } else {
 317                 drm_connector_attach_encoder(&imxpd->connector, encoder);
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 324 {
 325         struct drm_device *drm = data;
 326         struct device_node *np = dev->of_node;
 327         const u8 *edidp;
 328         struct imx_parallel_display *imxpd;
 329         int ret;
 330         u32 bus_format = 0;
 331         const char *fmt;
 332
 333         imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
 334         if (!imxpd)
 335                 return -ENOMEM;
 336
 337         edidp = of_get_property(np, "edid", &imxpd->edid_len);
 338         if (edidp)
 339                 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
 340
 341         ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 342         if (!ret) {
 343                 if (!strcmp(fmt, "rgb24"))
 344                         bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 345                 else if (!strcmp(fmt, "rgb565"))
 346                         bus_format = MEDIA_BUS_FMT_RGB565_1X16;
 347                 else if (!strcmp(fmt, "bgr666"))
 348                         bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 349                 else if (!strcmp(fmt, "lvds666"))
 350                         bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 351         }
 352         imxpd->bus_format = bus_format;
 353
 354         /* port@1 is the output port */
 355         ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
 356                                           &imxpd->next_bridge);
 357         if (ret && ret != -ENODEV)
 358                 return ret;
 359
 360         imxpd->dev = dev;
 361
 362         ret = imx_pd_register(drm, imxpd);
 363         if (ret)
 364                 return ret;
 365
 366         dev_set_drvdata(dev, imxpd);
 367
 368         return 0;
 369 }
 370
 371 static void imx_pd_unbind(struct device *dev, struct device *master,
 372         void *data)
 373 {
 374         struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 375
 376         if (imxpd->panel)
 377                 drm_panel_detach(imxpd->panel);
 378
 379         kfree(imxpd->edid);
 380 }
 381
 382 static const struct component_ops imx_pd_ops = {
 383         .bind   = imx_pd_bind,
 384         .unbind = imx_pd_unbind,
 385 };
 386
 387 static int imx_pd_probe(struct platform_device *pdev)
 388 {
 389         return component_add(&pdev->dev, &imx_pd_ops);
 390 }
 391
 392 static int imx_pd_remove(struct platform_device *pdev)
 393 {
 394         component_del(&pdev->dev, &imx_pd_ops);
 395
 396         return 0;
 397 }
 398
 399 static const struct of_device_id imx_pd_dt_ids[] = {
 400         { .compatible = "fsl,imx-parallel-display", },
 401         { /* sentinel */ }
 402 };
 403 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
 404
 405 static struct platform_driver imx_pd_driver = {
 406         .probe          = imx_pd_probe,
 407         .remove         = imx_pd_remove,
 408         .driver         = {
 409                 .of_match_table = imx_pd_dt_ids,
 410                 .name   = "imx-parallel-display",
 411         },
 412 };
 413
 414 module_platform_driver(imx_pd_driver);
 415
 416 MODULE_DESCRIPTION("i.MX parallel display driver");
 417 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 418 MODULE_LICENSE("GPL");
 419 MODULE_ALIAS("platform:imx-parallel-display");