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