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