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