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
  20 #include "tilcdc_drv.h"
  21 #include "tilcdc_panel.h"
  22
  23 struct panel_module {
  24         struct tilcdc_module base;
  25         struct tilcdc_panel_info *info;
  26         struct display_timings *timings;
  27         struct backlight_device *backlight;
  28         struct gpio_desc *enable_gpio;
  29 };
  30 #define to_panel_module(x) container_of(x, struct panel_module, base)
  31
  32
  33 /*
  34  * Encoder:
  35  */
  36
  37 struct panel_encoder {
  38         struct drm_encoder base;
  39         struct panel_module *mod;
  40 };
  41 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  42
  43 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  44 {
  45         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  46         struct backlight_device *backlight = panel_encoder->mod->backlight;
  47         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  48
  49         if (backlight) {
  50                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  51                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  52                 backlight_update_status(backlight);
  53         }
  54
  55         if (gpio)
  56                 gpiod_set_value_cansleep(gpio,
  57                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  58 }
  59
  60 static void panel_encoder_prepare(struct drm_encoder *encoder)
  61 {
  62         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  63 }
  64
  65 static void panel_encoder_commit(struct drm_encoder *encoder)
  66 {
  67         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  68 }
  69
  70 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  71                 struct drm_display_mode *mode,
  72                 struct drm_display_mode *adjusted_mode)
  73 {
  74         /* nothing needed */
  75 }
  76
  77 static const struct drm_encoder_funcs panel_encoder_funcs = {
  78                 .destroy        = drm_encoder_cleanup,
  79 };
  80
  81 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  82                 .dpms           = panel_encoder_dpms,
  83                 .prepare        = panel_encoder_prepare,
  84                 .commit         = panel_encoder_commit,
  85                 .mode_set       = panel_encoder_mode_set,
  86 };
  87
  88 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
  89                 struct panel_module *mod)
  90 {
  91         struct panel_encoder *panel_encoder;
  92         struct drm_encoder *encoder;
  93         int ret;
  94
  95         panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
  96                                      GFP_KERNEL);
  97         if (!panel_encoder)
  98                 return NULL;
  99
 100         panel_encoder->mod = mod;
 101
 102         encoder = &panel_encoder->base;
 103         encoder->possible_crtcs = 1;
 104
 105         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 106                         DRM_MODE_ENCODER_LVDS, NULL);
 107         if (ret < 0)
 108                 goto fail;
 109
 110         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 111
 112         return encoder;
 113
 114 fail:
 115         drm_encoder_cleanup(encoder);
 116         return NULL;
 117 }
 118
 119 /*
 120  * Connector:
 121  */
 122
 123 struct panel_connector {
 124         struct drm_connector base;
 125
 126         struct drm_encoder *encoder;  /* our connected encoder */
 127         struct panel_module *mod;
 128 };
 129 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 130
 131
 132 static void panel_connector_destroy(struct drm_connector *connector)
 133 {
 134         drm_connector_unregister(connector);
 135         drm_connector_cleanup(connector);
 136 }
 137
 138 static int panel_connector_get_modes(struct drm_connector *connector)
 139 {
 140         struct drm_device *dev = connector->dev;
 141         struct panel_connector *panel_connector = to_panel_connector(connector);
 142         struct display_timings *timings = panel_connector->mod->timings;
 143         int i;
 144
 145         for (i = 0; i < timings->num_timings; i++) {
 146                 struct drm_display_mode *mode = drm_mode_create(dev);
 147                 struct videomode vm;
 148
 149                 if (videomode_from_timings(timings, &vm, i))
 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 *bl_node, *node = pdev->dev.of_node;
 307         struct panel_module *panel_mod;
 308         struct tilcdc_module *mod;
 309         struct pinctrl *pinctrl;
 310         int ret;
 311
 312         /* bail out early if no DT data: */
 313         if (!node) {
 314                 dev_err(&pdev->dev, "device-tree data is missing\n");
 315                 return -ENXIO;
 316         }
 317
 318         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 319         if (!panel_mod)
 320                 return -ENOMEM;
 321
 322         bl_node = of_parse_phandle(node, "backlight", 0);
 323         if (bl_node) {
 324                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 325                 of_node_put(bl_node);
 326
 327                 if (!panel_mod->backlight)
 328                         return -EPROBE_DEFER;
 329
 330                 dev_info(&pdev->dev, "found backlight\n");
 331         }
 332
 333         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 334                                                          GPIOD_OUT_LOW);
 335         if (IS_ERR(panel_mod->enable_gpio)) {
 336                 ret = PTR_ERR(panel_mod->enable_gpio);
 337                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 338                 goto fail_backlight;
 339         }
 340
 341         if (panel_mod->enable_gpio)
 342                 dev_info(&pdev->dev, "found enable GPIO\n");
 343
 344         mod = &panel_mod->base;
 345         pdev->dev.platform_data = mod;
 346
 347         tilcdc_module_init(mod, "panel", &panel_module_ops);
 348
 349         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 350         if (IS_ERR(pinctrl))
 351                 dev_warn(&pdev->dev, "pins are not configured\n");
 352
 353         panel_mod->timings = of_get_display_timings(node);
 354         if (!panel_mod->timings) {
 355                 dev_err(&pdev->dev, "could not get panel timings\n");
 356                 ret = -EINVAL;
 357                 goto fail_free;
 358         }
 359
 360         panel_mod->info = of_get_panel_info(node);
 361         if (!panel_mod->info) {
 362                 dev_err(&pdev->dev, "could not get panel info\n");
 363                 ret = -EINVAL;
 364                 goto fail_timings;
 365         }
 366
 367         return 0;
 368
 369 fail_timings:
 370         display_timings_release(panel_mod->timings);
 371
 372 fail_free:
 373         tilcdc_module_cleanup(mod);
 374
 375 fail_backlight:
 376         if (panel_mod->backlight)
 377                 put_device(&panel_mod->backlight->dev);
 378         return ret;
 379 }
 380
 381 static int panel_remove(struct platform_device *pdev)
 382 {
 383         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 384         struct panel_module *panel_mod = to_panel_module(mod);
 385         struct backlight_device *backlight = panel_mod->backlight;
 386
 387         if (backlight)
 388                 put_device(&backlight->dev);
 389
 390         display_timings_release(panel_mod->timings);
 391
 392         tilcdc_module_cleanup(mod);
 393         kfree(panel_mod->info);
 394
 395         return 0;
 396 }
 397
 398 static const struct of_device_id panel_of_match[] = {
 399                 { .compatible = "ti,tilcdc,panel", },
 400                 { },
 401 };
 402
 403 struct platform_driver panel_driver = {
 404         .probe = panel_probe,
 405         .remove = panel_remove,
 406         .driver = {
 407                 .owner = THIS_MODULE,
 408                 .name = "tilcdc-panel",
 409                 .of_match_table = panel_of_match,
 410         },
 411 };
 412
 413 int __init tilcdc_panel_init(void)
 414 {
 415         return platform_driver_register(&panel_driver);
 416 }
 417
 418 void __exit tilcdc_panel_fini(void)
 419 {
 420         platform_driver_unregister(&panel_driver);
 421 }