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 <robdclark@gmail.com>
   5  */
   6
   7 #include <linux/pinctrl/pinmux.h>
   8 #include <linux/pinctrl/consumer.h>
   9 #include <linux/backlight.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <video/display_timing.h>
  12 #include <video/of_display_timing.h>
  13 #include <video/videomode.h>
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_probe_helper.h>
  16
  17 #include "tilcdc_drv.h"
  18 #include "tilcdc_panel.h"
  19
  20 struct panel_module {
  21         struct tilcdc_module base;
  22         struct tilcdc_panel_info *info;
  23         struct display_timings *timings;
  24         struct backlight_device *backlight;
  25         struct gpio_desc *enable_gpio;
  26 };
  27 #define to_panel_module(x) container_of(x, struct panel_module, base)
  28
  29
  30 /*
  31  * Encoder:
  32  */
  33
  34 struct panel_encoder {
  35         struct drm_encoder base;
  36         struct panel_module *mod;
  37 };
  38 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  39
  40 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  41 {
  42         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  43         struct backlight_device *backlight = panel_encoder->mod->backlight;
  44         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  45
  46         if (backlight) {
  47                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  48                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  49                 backlight_update_status(backlight);
  50         }
  51
  52         if (gpio)
  53                 gpiod_set_value_cansleep(gpio,
  54                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  55 }
  56
  57 static void panel_encoder_prepare(struct drm_encoder *encoder)
  58 {
  59         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  60 }
  61
  62 static void panel_encoder_commit(struct drm_encoder *encoder)
  63 {
  64         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  65 }
  66
  67 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  68                 struct drm_display_mode *mode,
  69                 struct drm_display_mode *adjusted_mode)
  70 {
  71         /* nothing needed */
  72 }
  73
  74 static const struct drm_encoder_funcs panel_encoder_funcs = {
  75                 .destroy        = drm_encoder_cleanup,
  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_encoder_init(dev, encoder, &panel_encoder_funcs,
 103                         DRM_MODE_ENCODER_LVDS, NULL);
 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 = drm_mode_create(dev);
 144                 struct videomode vm;
 145
 146                 if (videomode_from_timings(timings, &vm, i))
 147                         break;
 148
 149                 drm_display_mode_from_videomode(&vm, mode);
 150
 151                 mode->type = DRM_MODE_TYPE_DRIVER;
 152
 153                 if (timings->native_mode == i)
 154                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 155
 156                 drm_mode_set_name(mode);
 157                 drm_mode_probed_add(connector, mode);
 158         }
 159
 160         return i;
 161 }
 162
 163 static int panel_connector_mode_valid(struct drm_connector *connector,
 164                   struct drm_display_mode *mode)
 165 {
 166         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 167         /* our only constraints are what the crtc can generate: */
 168         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 169 }
 170
 171 static struct drm_encoder *panel_connector_best_encoder(
 172                 struct drm_connector *connector)
 173 {
 174         struct panel_connector *panel_connector = to_panel_connector(connector);
 175         return panel_connector->encoder;
 176 }
 177
 178 static const struct drm_connector_funcs panel_connector_funcs = {
 179         .destroy            = panel_connector_destroy,
 180         .fill_modes         = drm_helper_probe_single_connector_modes,
 181         .reset              = drm_atomic_helper_connector_reset,
 182         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 183         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 184 };
 185
 186 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 187         .get_modes          = panel_connector_get_modes,
 188         .mode_valid         = panel_connector_mode_valid,
 189         .best_encoder       = panel_connector_best_encoder,
 190 };
 191
 192 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 193                 struct panel_module *mod, struct drm_encoder *encoder)
 194 {
 195         struct panel_connector *panel_connector;
 196         struct drm_connector *connector;
 197         int ret;
 198
 199         panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 200                                        GFP_KERNEL);
 201         if (!panel_connector)
 202                 return NULL;
 203
 204         panel_connector->encoder = encoder;
 205         panel_connector->mod = mod;
 206
 207         connector = &panel_connector->base;
 208
 209         drm_connector_init(dev, connector, &panel_connector_funcs,
 210                         DRM_MODE_CONNECTOR_LVDS);
 211         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 212
 213         connector->interlace_allowed = 0;
 214         connector->doublescan_allowed = 0;
 215
 216         ret = drm_connector_attach_encoder(connector, encoder);
 217         if (ret)
 218                 goto fail;
 219
 220         return connector;
 221
 222 fail:
 223         panel_connector_destroy(connector);
 224         return NULL;
 225 }
 226
 227 /*
 228  * Module:
 229  */
 230
 231 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 232 {
 233         struct panel_module *panel_mod = to_panel_module(mod);
 234         struct tilcdc_drm_private *priv = dev->dev_private;
 235         struct drm_encoder *encoder;
 236         struct drm_connector *connector;
 237
 238         encoder = panel_encoder_create(dev, panel_mod);
 239         if (!encoder)
 240                 return -ENOMEM;
 241
 242         connector = panel_connector_create(dev, panel_mod, encoder);
 243         if (!connector)
 244                 return -ENOMEM;
 245
 246         priv->encoders[priv->num_encoders++] = encoder;
 247         priv->connectors[priv->num_connectors++] = connector;
 248
 249         tilcdc_crtc_set_panel_info(priv->crtc,
 250                                    to_panel_encoder(encoder)->mod->info);
 251
 252         return 0;
 253 }
 254
 255 static const struct tilcdc_module_ops panel_module_ops = {
 256                 .modeset_init = panel_modeset_init,
 257 };
 258
 259 /*
 260  * Device:
 261  */
 262
 263 /* maybe move this somewhere common if it is needed by other outputs? */
 264 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 265 {
 266         struct device_node *info_np;
 267         struct tilcdc_panel_info *info;
 268         int ret = 0;
 269
 270         if (!np) {
 271                 pr_err("%s: no devicenode given\n", __func__);
 272                 return NULL;
 273         }
 274
 275         info_np = of_get_child_by_name(np, "panel-info");
 276         if (!info_np) {
 277                 pr_err("%s: could not find panel-info node\n", __func__);
 278                 return NULL;
 279         }
 280
 281         info = kzalloc(sizeof(*info), GFP_KERNEL);
 282         if (!info)
 283                 goto put_node;
 284
 285         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 286         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 287         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 288         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 289         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 290         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 291         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 292         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 293         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 294
 295         /* optional: */
 296         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 297         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 298
 299         if (ret) {
 300                 pr_err("%s: error reading panel-info properties\n", __func__);
 301                 kfree(info);
 302                 info = NULL;
 303         }
 304
 305 put_node:
 306         of_node_put(info_np);
 307         return info;
 308 }
 309
 310 static int panel_probe(struct platform_device *pdev)
 311 {
 312         struct device_node *bl_node, *node = pdev->dev.of_node;
 313         struct panel_module *panel_mod;
 314         struct tilcdc_module *mod;
 315         struct pinctrl *pinctrl;
 316         int ret;
 317
 318         /* bail out early if no DT data: */
 319         if (!node) {
 320                 dev_err(&pdev->dev, "device-tree data is missing\n");
 321                 return -ENXIO;
 322         }
 323
 324         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 325         if (!panel_mod)
 326                 return -ENOMEM;
 327
 328         bl_node = of_parse_phandle(node, "backlight", 0);
 329         if (bl_node) {
 330                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 331                 of_node_put(bl_node);
 332
 333                 if (!panel_mod->backlight)
 334                         return -EPROBE_DEFER;
 335
 336                 dev_info(&pdev->dev, "found backlight\n");
 337         }
 338
 339         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 340                                                          GPIOD_OUT_LOW);
 341         if (IS_ERR(panel_mod->enable_gpio)) {
 342                 ret = PTR_ERR(panel_mod->enable_gpio);
 343                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 344                 goto fail_backlight;
 345         }
 346
 347         if (panel_mod->enable_gpio)
 348                 dev_info(&pdev->dev, "found enable GPIO\n");
 349
 350         mod = &panel_mod->base;
 351         pdev->dev.platform_data = mod;
 352
 353         tilcdc_module_init(mod, "panel", &panel_module_ops);
 354
 355         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 356         if (IS_ERR(pinctrl))
 357                 dev_warn(&pdev->dev, "pins are not configured\n");
 358
 359         panel_mod->timings = of_get_display_timings(node);
 360         if (!panel_mod->timings) {
 361                 dev_err(&pdev->dev, "could not get panel timings\n");
 362                 ret = -EINVAL;
 363                 goto fail_free;
 364         }
 365
 366         panel_mod->info = of_get_panel_info(node);
 367         if (!panel_mod->info) {
 368                 dev_err(&pdev->dev, "could not get panel info\n");
 369                 ret = -EINVAL;
 370                 goto fail_timings;
 371         }
 372
 373         return 0;
 374
 375 fail_timings:
 376         display_timings_release(panel_mod->timings);
 377
 378 fail_free:
 379         tilcdc_module_cleanup(mod);
 380
 381 fail_backlight:
 382         if (panel_mod->backlight)
 383                 put_device(&panel_mod->backlight->dev);
 384         return ret;
 385 }
 386
 387 static int panel_remove(struct platform_device *pdev)
 388 {
 389         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 390         struct panel_module *panel_mod = to_panel_module(mod);
 391         struct backlight_device *backlight = panel_mod->backlight;
 392
 393         if (backlight)
 394                 put_device(&backlight->dev);
 395
 396         display_timings_release(panel_mod->timings);
 397
 398         tilcdc_module_cleanup(mod);
 399         kfree(panel_mod->info);
 400
 401         return 0;
 402 }
 403
 404 static const struct of_device_id panel_of_match[] = {
 405                 { .compatible = "ti,tilcdc,panel", },
 406                 { },
 407 };
 408
 409 struct platform_driver panel_driver = {
 410         .probe = panel_probe,
 411         .remove = panel_remove,
 412         .driver = {
 413                 .owner = THIS_MODULE,
 414                 .name = "tilcdc-panel",
 415                 .of_match_table = panel_of_match,
 416         },
 417 };
 418
 419 int __init tilcdc_panel_init(void)
 420 {
 421         return platform_driver_register(&panel_driver);
 422 }
 423
 424 void __exit tilcdc_panel_fini(void)
 425 {
 426         platform_driver_unregister(&panel_driver);
 427 }