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