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/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;
 143                 struct videomode vm;
 144
 145                 if (videomode_from_timings(timings, &vm, i))
 146                         break;
 147
 148                 mode = drm_mode_create(dev);
 149                 if (!mode)
 150                         break;
 151
 152                 drm_display_mode_from_videomode(&vm, mode);
 153
 154                 mode->type = DRM_MODE_TYPE_DRIVER;
 155
 156                 if (timings->native_mode == i)
 157                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 158
 159                 drm_mode_set_name(mode);
 160                 drm_mode_probed_add(connector, mode);
 161         }
 162
 163         return i;
 164 }
 165
 166 static struct drm_encoder *panel_connector_best_encoder(
 167                 struct drm_connector *connector)
 168 {
 169         struct panel_connector *panel_connector = to_panel_connector(connector);
 170         return panel_connector->encoder;
 171 }
 172
 173 static const struct drm_connector_funcs panel_connector_funcs = {
 174         .destroy            = panel_connector_destroy,
 175         .fill_modes         = drm_helper_probe_single_connector_modes,
 176         .reset              = drm_atomic_helper_connector_reset,
 177         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 178         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 179 };
 180
 181 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 182         .get_modes          = panel_connector_get_modes,
 183         .best_encoder       = panel_connector_best_encoder,
 184 };
 185
 186 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 187                 struct panel_module *mod, struct drm_encoder *encoder)
 188 {
 189         struct panel_connector *panel_connector;
 190         struct drm_connector *connector;
 191         int ret;
 192
 193         panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 194                                        GFP_KERNEL);
 195         if (!panel_connector)
 196                 return NULL;
 197
 198         panel_connector->encoder = encoder;
 199         panel_connector->mod = mod;
 200
 201         connector = &panel_connector->base;
 202
 203         drm_connector_init(dev, connector, &panel_connector_funcs,
 204                         DRM_MODE_CONNECTOR_LVDS);
 205         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 206
 207         connector->interlace_allowed = 0;
 208         connector->doublescan_allowed = 0;
 209
 210         ret = drm_connector_attach_encoder(connector, encoder);
 211         if (ret)
 212                 goto fail;
 213
 214         return connector;
 215
 216 fail:
 217         panel_connector_destroy(connector);
 218         return NULL;
 219 }
 220
 221 /*
 222  * Module:
 223  */
 224
 225 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 226 {
 227         struct panel_module *panel_mod = to_panel_module(mod);
 228         struct tilcdc_drm_private *priv = dev->dev_private;
 229         struct drm_encoder *encoder;
 230         struct drm_connector *connector;
 231
 232         encoder = panel_encoder_create(dev, panel_mod);
 233         if (!encoder)
 234                 return -ENOMEM;
 235
 236         connector = panel_connector_create(dev, panel_mod, encoder);
 237         if (!connector)
 238                 return -ENOMEM;
 239
 240         priv->encoders[priv->num_encoders++] = encoder;
 241         priv->connectors[priv->num_connectors++] = connector;
 242
 243         tilcdc_crtc_set_panel_info(priv->crtc,
 244                                    to_panel_encoder(encoder)->mod->info);
 245
 246         return 0;
 247 }
 248
 249 static const struct tilcdc_module_ops panel_module_ops = {
 250                 .modeset_init = panel_modeset_init,
 251 };
 252
 253 /*
 254  * Device:
 255  */
 256
 257 /* maybe move this somewhere common if it is needed by other outputs? */
 258 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 259 {
 260         struct device_node *info_np;
 261         struct tilcdc_panel_info *info;
 262         int ret = 0;
 263
 264         if (!np) {
 265                 pr_err("%s: no devicenode given\n", __func__);
 266                 return NULL;
 267         }
 268
 269         info_np = of_get_child_by_name(np, "panel-info");
 270         if (!info_np) {
 271                 pr_err("%s: could not find panel-info node\n", __func__);
 272                 return NULL;
 273         }
 274
 275         info = kzalloc(sizeof(*info), GFP_KERNEL);
 276         if (!info)
 277                 goto put_node;
 278
 279         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 280         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 281         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 282         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 283         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 284         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 285         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 286         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 287         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 288
 289         /* optional: */
 290         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 291         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 292
 293         if (ret) {
 294                 pr_err("%s: error reading panel-info properties\n", __func__);
 295                 kfree(info);
 296                 info = NULL;
 297         }
 298
 299 put_node:
 300         of_node_put(info_np);
 301         return info;
 302 }
 303
 304 static int panel_probe(struct platform_device *pdev)
 305 {
 306         struct device_node *node = pdev->dev.of_node;
 307         struct backlight_device *backlight;
 308         struct panel_module *panel_mod;
 309         struct tilcdc_module *mod;
 310         struct pinctrl *pinctrl;
 311         int ret;
 312
 313         /* bail out early if no DT data: */
 314         if (!node) {
 315                 dev_err(&pdev->dev, "device-tree data is missing\n");
 316                 return -ENXIO;
 317         }
 318
 319         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 320         if (!panel_mod)
 321                 return -ENOMEM;
 322
 323         backlight = devm_of_find_backlight(&pdev->dev);
 324         if (IS_ERR(backlight))
 325                 return PTR_ERR(backlight);
 326         panel_mod->backlight = backlight;
 327
 328         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 329                                                          GPIOD_OUT_LOW);
 330         if (IS_ERR(panel_mod->enable_gpio)) {
 331                 ret = PTR_ERR(panel_mod->enable_gpio);
 332                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 333                 goto fail_backlight;
 334         }
 335
 336         if (panel_mod->enable_gpio)
 337                 dev_info(&pdev->dev, "found enable GPIO\n");
 338
 339         mod = &panel_mod->base;
 340         pdev->dev.platform_data = mod;
 341
 342         tilcdc_module_init(mod, "panel", &panel_module_ops);
 343
 344         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 345         if (IS_ERR(pinctrl))
 346                 dev_warn(&pdev->dev, "pins are not configured\n");
 347
 348         panel_mod->timings = of_get_display_timings(node);
 349         if (!panel_mod->timings) {
 350                 dev_err(&pdev->dev, "could not get panel timings\n");
 351                 ret = -EINVAL;
 352                 goto fail_free;
 353         }
 354
 355         panel_mod->info = of_get_panel_info(node);
 356         if (!panel_mod->info) {
 357                 dev_err(&pdev->dev, "could not get panel info\n");
 358                 ret = -EINVAL;
 359                 goto fail_timings;
 360         }
 361
 362         return 0;
 363
 364 fail_timings:
 365         display_timings_release(panel_mod->timings);
 366
 367 fail_free:
 368         tilcdc_module_cleanup(mod);
 369
 370 fail_backlight:
 371         if (panel_mod->backlight)
 372                 put_device(&panel_mod->backlight->dev);
 373         return ret;
 374 }
 375
 376 static int panel_remove(struct platform_device *pdev)
 377 {
 378         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 379         struct panel_module *panel_mod = to_panel_module(mod);
 380         struct backlight_device *backlight = panel_mod->backlight;
 381
 382         if (backlight)
 383                 put_device(&backlight->dev);
 384
 385         display_timings_release(panel_mod->timings);
 386
 387         tilcdc_module_cleanup(mod);
 388         kfree(panel_mod->info);
 389
 390         return 0;
 391 }
 392
 393 static const struct of_device_id panel_of_match[] = {
 394                 { .compatible = "ti,tilcdc,panel", },
 395                 { },
 396 };
 397
 398 static struct platform_driver panel_driver = {
 399         .probe = panel_probe,
 400         .remove = panel_remove,
 401         .driver = {
 402                 .name = "tilcdc-panel",
 403                 .of_match_table = panel_of_match,
 404         },
 405 };
 406
 407 int __init tilcdc_panel_init(void)
 408 {
 409         return platform_driver_register(&panel_driver);
 410 }
 411
 412 void __exit tilcdc_panel_fini(void)
 413 {
 414         platform_driver_unregister(&panel_driver);
 415 }