drivers/gpu/drm/tilcdc/tilcdc_panel.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Texas Instruments
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <linux/backlight.h>
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/pinctrl/consumer.h>
  10 #include <linux/platform_device.h>
  11
  12 #include <video/display_timing.h>
  13 #include <video/of_display_timing.h>
  14 #include <video/videomode.h>
  15
  16 #include <drm/drm_atomic_state_helper.h>
  17 #include <drm/drm_connector.h>
  18 #include <drm/drm_modeset_helper_vtables.h>
  19 #include <drm/drm_probe_helper.h>
  20 #include <drm/drm_simple_kms_helper.h>
  21
  22 #include "tilcdc_drv.h"
  23 #include "tilcdc_panel.h"
  24
  25 struct panel_module {
  26         struct tilcdc_module base;
  27         struct tilcdc_panel_info *info;
  28         struct display_timings *timings;
  29         struct backlight_device *backlight;
  30         struct gpio_desc *enable_gpio;
  31 };
  32 #define to_panel_module(x) container_of(x, struct panel_module, base)
  33
  34
  35 /*
  36  * Encoder:
  37  */
  38
  39 struct panel_encoder {
  40         struct drm_encoder base;
  41         struct panel_module *mod;
  42 };
  43 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  44
  45 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  46 {
  47         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  48         struct backlight_device *backlight = panel_encoder->mod->backlight;
  49         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  50
  51         if (backlight) {
  52                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  53                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  54                 backlight_update_status(backlight);
  55         }
  56
  57         if (gpio)
  58                 gpiod_set_value_cansleep(gpio,
  59                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  60 }
  61
  62 static void panel_encoder_prepare(struct drm_encoder *encoder)
  63 {
  64         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  65 }
  66
  67 static void panel_encoder_commit(struct drm_encoder *encoder)
  68 {
  69         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  70 }
  71
  72 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  73                 struct drm_display_mode *mode,
  74                 struct drm_display_mode *adjusted_mode)
  75 {
  76         /* nothing needed */
  77 }
  78
  79 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  80                 .dpms           = panel_encoder_dpms,
  81                 .prepare        = panel_encoder_prepare,
  82                 .commit         = panel_encoder_commit,
  83                 .mode_set       = panel_encoder_mode_set,
  84 };
  85
  86 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
  87                 struct panel_module *mod)
  88 {
  89         struct panel_encoder *panel_encoder;
  90         struct drm_encoder *encoder;
  91         int ret;
  92
  93         panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
  94                                      GFP_KERNEL);
  95         if (!panel_encoder)
  96                 return NULL;
  97
  98         panel_encoder->mod = mod;
  99
 100         encoder = &panel_encoder->base;
 101         encoder->possible_crtcs = 1;
 102
 103         ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 104         if (ret < 0)
 105                 goto fail;
 106
 107         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 108
 109         return encoder;
 110
 111 fail:
 112         drm_encoder_cleanup(encoder);
 113         return NULL;
 114 }
 115
 116 /*
 117  * Connector:
 118  */
 119
 120 struct panel_connector {
 121         struct drm_connector base;
 122
 123         struct drm_encoder *encoder;  /* our connected encoder */
 124         struct panel_module *mod;
 125 };
 126 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 127
 128
 129 static void panel_connector_destroy(struct drm_connector *connector)
 130 {
 131         drm_connector_unregister(connector);
 132         drm_connector_cleanup(connector);
 133 }
 134
 135 static int panel_connector_get_modes(struct drm_connector *connector)
 136 {
 137         struct drm_device *dev = connector->dev;
 138         struct panel_connector *panel_connector = to_panel_connector(connector);
 139         struct display_timings *timings = panel_connector->mod->timings;
 140         int i;
 141
 142         for (i = 0; i < timings->num_timings; i++) {
 143                 struct drm_display_mode *mode;
 144                 struct videomode vm;
 145
 146                 if (videomode_from_timings(timings, &vm, i))
 147                         break;
 148
 149                 mode = drm_mode_create(dev);
 150                 if (!mode)
 151                         break;
 152
 153                 drm_display_mode_from_videomode(&vm, mode);
 154
 155                 mode->type = DRM_MODE_TYPE_DRIVER;
 156
 157                 if (timings->native_mode == i)
 158                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 159
 160                 drm_mode_set_name(mode);
 161                 drm_mode_probed_add(connector, mode);
 162         }
 163
 164         return i;
 165 }
 166
 167 static struct drm_encoder *panel_connector_best_encoder(
 168                 struct drm_connector *connector)
 169 {
 170         struct panel_connector *panel_connector = to_panel_connector(connector);
 171         return panel_connector->encoder;
 172 }
 173
 174 static const struct drm_connector_funcs panel_connector_funcs = {
 175         .destroy            = panel_connector_destroy,
 176         .fill_modes         = drm_helper_probe_single_connector_modes,
 177         .reset              = drm_atomic_helper_connector_reset,
 178         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 179         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 180 };
 181
 182 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 183         .get_modes          = panel_connector_get_modes,
 184         .best_encoder       = panel_connector_best_encoder,
 185 };
 186
 187 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 188                 struct panel_module *mod, struct drm_encoder *encoder)
 189 {
 190         struct panel_connector *panel_connector;
 191         struct drm_connector *connector;
 192         int ret;
 193
 194         panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 195                                        GFP_KERNEL);
 196         if (!panel_connector)
 197                 return NULL;
 198
 199         panel_connector->encoder = encoder;
 200         panel_connector->mod = mod;
 201
 202         connector = &panel_connector->base;
 203
 204         drm_connector_init(dev, connector, &panel_connector_funcs,
 205                         DRM_MODE_CONNECTOR_LVDS);
 206         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 207
 208         connector->interlace_allowed = 0;
 209         connector->doublescan_allowed = 0;
 210
 211         ret = drm_connector_attach_encoder(connector, encoder);
 212         if (ret)
 213                 goto fail;
 214
 215         return connector;
 216
 217 fail:
 218         panel_connector_destroy(connector);
 219         return NULL;
 220 }
 221
 222 /*
 223  * Module:
 224  */
 225
 226 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 227 {
 228         struct panel_module *panel_mod = to_panel_module(mod);
 229         struct tilcdc_drm_private *priv = dev->dev_private;
 230         struct drm_encoder *encoder;
 231         struct drm_connector *connector;
 232
 233         encoder = panel_encoder_create(dev, panel_mod);
 234         if (!encoder)
 235                 return -ENOMEM;
 236
 237         connector = panel_connector_create(dev, panel_mod, encoder);
 238         if (!connector)
 239                 return -ENOMEM;
 240
 241         priv->encoders[priv->num_encoders++] = encoder;
 242         priv->connectors[priv->num_connectors++] = connector;
 243
 244         tilcdc_crtc_set_panel_info(priv->crtc,
 245                                    to_panel_encoder(encoder)->mod->info);
 246
 247         return 0;
 248 }
 249
 250 static const struct tilcdc_module_ops panel_module_ops = {
 251                 .modeset_init = panel_modeset_init,
 252 };
 253
 254 /*
 255  * Device:
 256  */
 257
 258 /* maybe move this somewhere common if it is needed by other outputs? */
 259 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 260 {
 261         struct device_node *info_np;
 262         struct tilcdc_panel_info *info;
 263         int ret = 0;
 264
 265         if (!np) {
 266                 pr_err("%s: no devicenode given\n", __func__);
 267                 return NULL;
 268         }
 269
 270         info_np = of_get_child_by_name(np, "panel-info");
 271         if (!info_np) {
 272                 pr_err("%s: could not find panel-info node\n", __func__);
 273                 return NULL;
 274         }
 275
 276         info = kzalloc(sizeof(*info), GFP_KERNEL);
 277         if (!info)
 278                 goto put_node;
 279
 280         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 281         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 282         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 283         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 284         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 285         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 286         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 287         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 288         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 289
 290         /* optional: */
 291         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 292         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 293
 294         if (ret) {
 295                 pr_err("%s: error reading panel-info properties\n", __func__);
 296                 kfree(info);
 297                 info = NULL;
 298         }
 299
 300 put_node:
 301         of_node_put(info_np);
 302         return info;
 303 }
 304
 305 static int panel_probe(struct platform_device *pdev)
 306 {
 307         struct device_node *node = pdev->dev.of_node;
 308         struct backlight_device *backlight;
 309         struct panel_module *panel_mod;
 310         struct tilcdc_module *mod;
 311         struct pinctrl *pinctrl;
 312         int ret;
 313
 314         /* bail out early if no DT data: */
 315         if (!node) {
 316                 dev_err(&pdev->dev, "device-tree data is missing\n");
 317                 return -ENXIO;
 318         }
 319
 320         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 321         if (!panel_mod)
 322                 return -ENOMEM;
 323
 324         backlight = devm_of_find_backlight(&pdev->dev);
 325         if (IS_ERR(backlight))
 326                 return PTR_ERR(backlight);
 327         panel_mod->backlight = backlight;
 328
 329         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 330                                                          GPIOD_OUT_LOW);
 331         if (IS_ERR(panel_mod->enable_gpio)) {
 332                 ret = PTR_ERR(panel_mod->enable_gpio);
 333                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 334                 goto fail_backlight;
 335         }
 336
 337         if (panel_mod->enable_gpio)
 338                 dev_info(&pdev->dev, "found enable GPIO\n");
 339
 340         mod = &panel_mod->base;
 341         pdev->dev.platform_data = mod;
 342
 343         tilcdc_module_init(mod, "panel", &panel_module_ops);
 344
 345         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 346         if (IS_ERR(pinctrl))
 347                 dev_warn(&pdev->dev, "pins are not configured\n");
 348
 349         panel_mod->timings = of_get_display_timings(node);
 350         if (!panel_mod->timings) {
 351                 dev_err(&pdev->dev, "could not get panel timings\n");
 352                 ret = -EINVAL;
 353                 goto fail_free;
 354         }
 355
 356         panel_mod->info = of_get_panel_info(node);
 357         if (!panel_mod->info) {
 358                 dev_err(&pdev->dev, "could not get panel info\n");
 359                 ret = -EINVAL;
 360                 goto fail_timings;
 361         }
 362
 363         return 0;
 364
 365 fail_timings:
 366         display_timings_release(panel_mod->timings);
 367
 368 fail_free:
 369         tilcdc_module_cleanup(mod);
 370
 371 fail_backlight:
 372         if (panel_mod->backlight)
 373                 put_device(&panel_mod->backlight->dev);
 374         return ret;
 375 }
 376
 377 static int panel_remove(struct platform_device *pdev)
 378 {
 379         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 380         struct panel_module *panel_mod = to_panel_module(mod);
 381         struct backlight_device *backlight = panel_mod->backlight;
 382
 383         if (backlight)
 384                 put_device(&backlight->dev);
 385
 386         display_timings_release(panel_mod->timings);
 387
 388         tilcdc_module_cleanup(mod);
 389         kfree(panel_mod->info);
 390
 391         return 0;
 392 }
 393
 394 static const struct of_device_id panel_of_match[] = {
 395                 { .compatible = "ti,tilcdc,panel", },
 396                 { },
 397 };
 398
 399 static struct platform_driver panel_driver = {
 400         .probe = panel_probe,
 401         .remove = panel_remove,
 402         .driver = {
 403                 .name = "tilcdc-panel",
 404                 .of_match_table = panel_of_match,
 405         },
 406 };
 407
 408 int __init tilcdc_panel_init(void)
 409 {
 410         return platform_driver_register(&panel_driver);
 411 }
 412
 413 void __exit tilcdc_panel_fini(void)
 414 {
 415         platform_driver_unregister(&panel_driver);
 416 }