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/gpio/consumer.h>
   8 #include <linux/pinctrl/consumer.h>
   9 #include <linux/platform_device.h>
  10
  11 #include <video/display_timing.h>
  12 #include <video/of_display_timing.h>
  13 #include <video/videomode.h>
  14
  15 #include <drm/drm_atomic_state_helper.h>
  16 #include <drm/drm_connector.h>
  17 #include <drm/drm_modeset_helper_vtables.h>
  18 #include <drm/drm_probe_helper.h>
  19 #include <drm/drm_simple_kms_helper.h>
  20
  21 #include "tilcdc_drv.h"
  22 #include "tilcdc_panel.h"
  23
  24 struct panel_module {
  25         struct tilcdc_module base;
  26         struct tilcdc_panel_info *info;
  27         struct display_timings *timings;
  28         struct backlight_device *backlight;
  29         struct gpio_desc *enable_gpio;
  30 };
  31 #define to_panel_module(x) container_of(x, struct panel_module, base)
  32
  33
  34 /*
  35  * Encoder:
  36  */
  37
  38 struct panel_encoder {
  39         struct drm_encoder base;
  40         struct panel_module *mod;
  41 };
  42 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  43
  44 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  45 {
  46         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  47         struct backlight_device *backlight = panel_encoder->mod->backlight;
  48         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  49
  50         if (backlight) {
  51                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  52                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  53                 backlight_update_status(backlight);
  54         }
  55
  56         if (gpio)
  57                 gpiod_set_value_cansleep(gpio,
  58                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  59 }
  60
  61 static void panel_encoder_prepare(struct drm_encoder *encoder)
  62 {
  63         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  64 }
  65
  66 static void panel_encoder_commit(struct drm_encoder *encoder)
  67 {
  68         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  69 }
  70
  71 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  72                 struct drm_display_mode *mode,
  73                 struct drm_display_mode *adjusted_mode)
  74 {
  75         /* nothing needed */
  76 }
  77
  78 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  79                 .dpms           = panel_encoder_dpms,
  80                 .prepare        = panel_encoder_prepare,
  81                 .commit         = panel_encoder_commit,
  82                 .mode_set       = panel_encoder_mode_set,
  83 };
  84
  85 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
  86                 struct panel_module *mod)
  87 {
  88         struct panel_encoder *panel_encoder;
  89         struct drm_encoder *encoder;
  90         int ret;
  91
  92         panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
  93                                      GFP_KERNEL);
  94         if (!panel_encoder)
  95                 return NULL;
  96
  97         panel_encoder->mod = mod;
  98
  99         encoder = &panel_encoder->base;
 100         encoder->possible_crtcs = 1;
 101
 102         ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
 103         if (ret < 0)
 104                 goto fail;
 105
 106         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 107
 108         return encoder;
 109
 110 fail:
 111         drm_encoder_cleanup(encoder);
 112         return NULL;
 113 }
 114
 115 /*
 116  * Connector:
 117  */
 118
 119 struct panel_connector {
 120         struct drm_connector base;
 121
 122         struct drm_encoder *encoder;  /* our connected encoder */
 123         struct panel_module *mod;
 124 };
 125 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 126
 127
 128 static void panel_connector_destroy(struct drm_connector *connector)
 129 {
 130         drm_connector_unregister(connector);
 131         drm_connector_cleanup(connector);
 132 }
 133
 134 static int panel_connector_get_modes(struct drm_connector *connector)
 135 {
 136         struct drm_device *dev = connector->dev;
 137         struct panel_connector *panel_connector = to_panel_connector(connector);
 138         struct display_timings *timings = panel_connector->mod->timings;
 139         int i;
 140
 141         for (i = 0; i < timings->num_timings; i++) {
 142                 struct drm_display_mode *mode = drm_mode_create(dev);
 143                 struct videomode vm;
 144
 145                 if (videomode_from_timings(timings, &vm, i))
 146                         break;
 147
 148                 drm_display_mode_from_videomode(&vm, mode);
 149
 150                 mode->type = DRM_MODE_TYPE_DRIVER;
 151
 152                 if (timings->native_mode == i)
 153                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 154
 155                 drm_mode_set_name(mode);
 156                 drm_mode_probed_add(connector, mode);
 157         }
 158
 159         return i;
 160 }
 161
 162 static struct drm_encoder *panel_connector_best_encoder(
 163                 struct drm_connector *connector)
 164 {
 165         struct panel_connector *panel_connector = to_panel_connector(connector);
 166         return panel_connector->encoder;
 167 }
 168
 169 static const struct drm_connector_funcs panel_connector_funcs = {
 170         .destroy            = panel_connector_destroy,
 171         .fill_modes         = drm_helper_probe_single_connector_modes,
 172         .reset              = drm_atomic_helper_connector_reset,
 173         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 174         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 175 };
 176
 177 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 178         .get_modes          = panel_connector_get_modes,
 179         .best_encoder       = panel_connector_best_encoder,
 180 };
 181
 182 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 183                 struct panel_module *mod, struct drm_encoder *encoder)
 184 {
 185         struct panel_connector *panel_connector;
 186         struct drm_connector *connector;
 187         int ret;
 188
 189         panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 190                                        GFP_KERNEL);
 191         if (!panel_connector)
 192                 return NULL;
 193
 194         panel_connector->encoder = encoder;
 195         panel_connector->mod = mod;
 196
 197         connector = &panel_connector->base;
 198
 199         drm_connector_init(dev, connector, &panel_connector_funcs,
 200                         DRM_MODE_CONNECTOR_LVDS);
 201         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 202
 203         connector->interlace_allowed = 0;
 204         connector->doublescan_allowed = 0;
 205
 206         ret = drm_connector_attach_encoder(connector, encoder);
 207         if (ret)
 208                 goto fail;
 209
 210         return connector;
 211
 212 fail:
 213         panel_connector_destroy(connector);
 214         return NULL;
 215 }
 216
 217 /*
 218  * Module:
 219  */
 220
 221 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 222 {
 223         struct panel_module *panel_mod = to_panel_module(mod);
 224         struct tilcdc_drm_private *priv = dev->dev_private;
 225         struct drm_encoder *encoder;
 226         struct drm_connector *connector;
 227
 228         encoder = panel_encoder_create(dev, panel_mod);
 229         if (!encoder)
 230                 return -ENOMEM;
 231
 232         connector = panel_connector_create(dev, panel_mod, encoder);
 233         if (!connector)
 234                 return -ENOMEM;
 235
 236         priv->encoders[priv->num_encoders++] = encoder;
 237         priv->connectors[priv->num_connectors++] = connector;
 238
 239         tilcdc_crtc_set_panel_info(priv->crtc,
 240                                    to_panel_encoder(encoder)->mod->info);
 241
 242         return 0;
 243 }
 244
 245 static const struct tilcdc_module_ops panel_module_ops = {
 246                 .modeset_init = panel_modeset_init,
 247 };
 248
 249 /*
 250  * Device:
 251  */
 252
 253 /* maybe move this somewhere common if it is needed by other outputs? */
 254 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 255 {
 256         struct device_node *info_np;
 257         struct tilcdc_panel_info *info;
 258         int ret = 0;
 259
 260         if (!np) {
 261                 pr_err("%s: no devicenode given\n", __func__);
 262                 return NULL;
 263         }
 264
 265         info_np = of_get_child_by_name(np, "panel-info");
 266         if (!info_np) {
 267                 pr_err("%s: could not find panel-info node\n", __func__);
 268                 return NULL;
 269         }
 270
 271         info = kzalloc(sizeof(*info), GFP_KERNEL);
 272         if (!info)
 273                 goto put_node;
 274
 275         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 276         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 277         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 278         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 279         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 280         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 281         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 282         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 283         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 284
 285         /* optional: */
 286         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 287         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 288
 289         if (ret) {
 290                 pr_err("%s: error reading panel-info properties\n", __func__);
 291                 kfree(info);
 292                 info = NULL;
 293         }
 294
 295 put_node:
 296         of_node_put(info_np);
 297         return info;
 298 }
 299
 300 static int panel_probe(struct platform_device *pdev)
 301 {
 302         struct device_node *bl_node, *node = pdev->dev.of_node;
 303         struct panel_module *panel_mod;
 304         struct tilcdc_module *mod;
 305         struct pinctrl *pinctrl;
 306         int ret;
 307
 308         /* bail out early if no DT data: */
 309         if (!node) {
 310                 dev_err(&pdev->dev, "device-tree data is missing\n");
 311                 return -ENXIO;
 312         }
 313
 314         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 315         if (!panel_mod)
 316                 return -ENOMEM;
 317
 318         bl_node = of_parse_phandle(node, "backlight", 0);
 319         if (bl_node) {
 320                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 321                 of_node_put(bl_node);
 322
 323                 if (!panel_mod->backlight)
 324                         return -EPROBE_DEFER;
 325
 326                 dev_info(&pdev->dev, "found backlight\n");
 327         }
 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 struct platform_driver panel_driver = {
 400         .probe = panel_probe,
 401         .remove = panel_remove,
 402         .driver = {
 403                 .owner = THIS_MODULE,
 404                 .name = "tilcdc-panel",
 405                 .of_match_table = panel_of_match,
 406         },
 407 };
 408
 409 int __init tilcdc_panel_init(void)
 410 {
 411         return platform_driver_register(&panel_driver);
 412 }
 413
 414 void __exit tilcdc_panel_fini(void)
 415 {
 416         platform_driver_unregister(&panel_driver);
 417 }