drivers/gpu/drm/tilcdc/tilcdc_panel.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/pinctrl/pinmux.h>
  19 #include <linux/pinctrl/consumer.h>
  20 #include <linux/backlight.h>
  21 #include <video/display_timing.h>
  22 #include <video/of_display_timing.h>
  23 #include <video/videomode.h>
  24
  25 #include "tilcdc_drv.h"
  26
  27 struct panel_module {
  28         struct tilcdc_module base;
  29         struct tilcdc_panel_info *info;
  30         struct display_timings *timings;
  31         struct backlight_device *backlight;
  32 };
  33 #define to_panel_module(x) container_of(x, struct panel_module, base)
  34
  35
  36 /*
  37  * Encoder:
  38  */
  39
  40 struct panel_encoder {
  41         struct drm_encoder base;
  42         struct panel_module *mod;
  43 };
  44 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  45
  46
  47 static void panel_encoder_destroy(struct drm_encoder *encoder)
  48 {
  49         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  50         drm_encoder_cleanup(encoder);
  51         kfree(panel_encoder);
  52 }
  53
  54 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  55 {
  56         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  57         struct backlight_device *backlight = panel_encoder->mod->backlight;
  58
  59         if (!backlight)
  60                 return;
  61
  62         backlight->props.power = mode == DRM_MODE_DPMS_ON
  63                                      ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  64         backlight_update_status(backlight);
  65 }
  66
  67 static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
  68                 const struct drm_display_mode *mode,
  69                 struct drm_display_mode *adjusted_mode)
  70 {
  71         /* nothing needed */
  72         return true;
  73 }
  74
  75 static void panel_encoder_prepare(struct drm_encoder *encoder)
  76 {
  77         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  78         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  79         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
  80 }
  81
  82 static void panel_encoder_commit(struct drm_encoder *encoder)
  83 {
  84         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  85 }
  86
  87 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  88                 struct drm_display_mode *mode,
  89                 struct drm_display_mode *adjusted_mode)
  90 {
  91         /* nothing needed */
  92 }
  93
  94 static const struct drm_encoder_funcs panel_encoder_funcs = {
  95                 .destroy        = panel_encoder_destroy,
  96 };
  97
  98 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  99                 .dpms           = panel_encoder_dpms,
 100                 .mode_fixup     = panel_encoder_mode_fixup,
 101                 .prepare        = panel_encoder_prepare,
 102                 .commit         = panel_encoder_commit,
 103                 .mode_set       = panel_encoder_mode_set,
 104 };
 105
 106 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
 107                 struct panel_module *mod)
 108 {
 109         struct panel_encoder *panel_encoder;
 110         struct drm_encoder *encoder;
 111         int ret;
 112
 113         panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
 114         if (!panel_encoder) {
 115                 dev_err(dev->dev, "allocation failed\n");
 116                 return NULL;
 117         }
 118
 119         panel_encoder->mod = mod;
 120
 121         encoder = &panel_encoder->base;
 122         encoder->possible_crtcs = 1;
 123
 124         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 125                         DRM_MODE_ENCODER_LVDS);
 126         if (ret < 0)
 127                 goto fail;
 128
 129         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 130
 131         return encoder;
 132
 133 fail:
 134         panel_encoder_destroy(encoder);
 135         return NULL;
 136 }
 137
 138 /*
 139  * Connector:
 140  */
 141
 142 struct panel_connector {
 143         struct drm_connector base;
 144
 145         struct drm_encoder *encoder;  /* our connected encoder */
 146         struct panel_module *mod;
 147 };
 148 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 149
 150
 151 static void panel_connector_destroy(struct drm_connector *connector)
 152 {
 153         struct panel_connector *panel_connector = to_panel_connector(connector);
 154         drm_connector_cleanup(connector);
 155         kfree(panel_connector);
 156 }
 157
 158 static enum drm_connector_status panel_connector_detect(
 159                 struct drm_connector *connector,
 160                 bool force)
 161 {
 162         return connector_status_connected;
 163 }
 164
 165 static int panel_connector_get_modes(struct drm_connector *connector)
 166 {
 167         struct drm_device *dev = connector->dev;
 168         struct panel_connector *panel_connector = to_panel_connector(connector);
 169         struct display_timings *timings = panel_connector->mod->timings;
 170         int i;
 171
 172         for (i = 0; i < timings->num_timings; i++) {
 173                 struct drm_display_mode *mode = drm_mode_create(dev);
 174                 struct videomode vm;
 175
 176                 if (videomode_from_timings(timings, &vm, i))
 177                         break;
 178
 179                 drm_display_mode_from_videomode(&vm, mode);
 180
 181                 mode->type = DRM_MODE_TYPE_DRIVER;
 182
 183                 if (timings->native_mode == i)
 184                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 185
 186                 drm_mode_set_name(mode);
 187                 drm_mode_probed_add(connector, mode);
 188         }
 189
 190         return i;
 191 }
 192
 193 static int panel_connector_mode_valid(struct drm_connector *connector,
 194                   struct drm_display_mode *mode)
 195 {
 196         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 197         /* our only constraints are what the crtc can generate: */
 198         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 199 }
 200
 201 static struct drm_encoder *panel_connector_best_encoder(
 202                 struct drm_connector *connector)
 203 {
 204         struct panel_connector *panel_connector = to_panel_connector(connector);
 205         return panel_connector->encoder;
 206 }
 207
 208 static const struct drm_connector_funcs panel_connector_funcs = {
 209         .destroy            = panel_connector_destroy,
 210         .dpms               = drm_helper_connector_dpms,
 211         .detect             = panel_connector_detect,
 212         .fill_modes         = drm_helper_probe_single_connector_modes,
 213 };
 214
 215 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 216         .get_modes          = panel_connector_get_modes,
 217         .mode_valid         = panel_connector_mode_valid,
 218         .best_encoder       = panel_connector_best_encoder,
 219 };
 220
 221 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 222                 struct panel_module *mod, struct drm_encoder *encoder)
 223 {
 224         struct panel_connector *panel_connector;
 225         struct drm_connector *connector;
 226         int ret;
 227
 228         panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
 229         if (!panel_connector) {
 230                 dev_err(dev->dev, "allocation failed\n");
 231                 return NULL;
 232         }
 233
 234         panel_connector->encoder = encoder;
 235         panel_connector->mod = mod;
 236
 237         connector = &panel_connector->base;
 238
 239         drm_connector_init(dev, connector, &panel_connector_funcs,
 240                         DRM_MODE_CONNECTOR_LVDS);
 241         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 242
 243         connector->interlace_allowed = 0;
 244         connector->doublescan_allowed = 0;
 245
 246         ret = drm_mode_connector_attach_encoder(connector, encoder);
 247         if (ret)
 248                 goto fail;
 249
 250         drm_sysfs_connector_add(connector);
 251
 252         return connector;
 253
 254 fail:
 255         panel_connector_destroy(connector);
 256         return NULL;
 257 }
 258
 259 /*
 260  * Module:
 261  */
 262
 263 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 264 {
 265         struct panel_module *panel_mod = to_panel_module(mod);
 266         struct tilcdc_drm_private *priv = dev->dev_private;
 267         struct drm_encoder *encoder;
 268         struct drm_connector *connector;
 269
 270         encoder = panel_encoder_create(dev, panel_mod);
 271         if (!encoder)
 272                 return -ENOMEM;
 273
 274         connector = panel_connector_create(dev, panel_mod, encoder);
 275         if (!connector)
 276                 return -ENOMEM;
 277
 278         priv->encoders[priv->num_encoders++] = encoder;
 279         priv->connectors[priv->num_connectors++] = connector;
 280
 281         return 0;
 282 }
 283
 284 static void panel_destroy(struct tilcdc_module *mod)
 285 {
 286         struct panel_module *panel_mod = to_panel_module(mod);
 287
 288         if (panel_mod->timings) {
 289                 display_timings_release(panel_mod->timings);
 290                 kfree(panel_mod->timings);
 291         }
 292
 293         tilcdc_module_cleanup(mod);
 294         kfree(panel_mod->info);
 295         kfree(panel_mod);
 296 }
 297
 298 static const struct tilcdc_module_ops panel_module_ops = {
 299                 .modeset_init = panel_modeset_init,
 300                 .destroy = panel_destroy,
 301 };
 302
 303 /*
 304  * Device:
 305  */
 306
 307 /* maybe move this somewhere common if it is needed by other outputs? */
 308 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 309 {
 310         struct device_node *info_np;
 311         struct tilcdc_panel_info *info;
 312         int ret = 0;
 313
 314         if (!np) {
 315                 pr_err("%s: no devicenode given\n", __func__);
 316                 return NULL;
 317         }
 318
 319         info_np = of_get_child_by_name(np, "panel-info");
 320         if (!info_np) {
 321                 pr_err("%s: could not find panel-info node\n", __func__);
 322                 return NULL;
 323         }
 324
 325         info = kzalloc(sizeof(*info), GFP_KERNEL);
 326         if (!info) {
 327                 pr_err("%s: allocation failed\n", __func__);
 328                 return NULL;
 329         }
 330
 331         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 332         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 333         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 334         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 335         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 336         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 337         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 338         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 339         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 340
 341         /* optional: */
 342         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 343         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 344
 345         if (ret) {
 346                 pr_err("%s: error reading panel-info properties\n", __func__);
 347                 kfree(info);
 348                 return NULL;
 349         }
 350
 351         return info;
 352 }
 353
 354 static struct of_device_id panel_of_match[];
 355
 356 static int panel_probe(struct platform_device *pdev)
 357 {
 358         struct device_node *node = pdev->dev.of_node;
 359         struct panel_module *panel_mod;
 360         struct tilcdc_module *mod;
 361         struct pinctrl *pinctrl;
 362         int ret = -EINVAL;
 363
 364
 365         /* bail out early if no DT data: */
 366         if (!node) {
 367                 dev_err(&pdev->dev, "device-tree data is missing\n");
 368                 return -ENXIO;
 369         }
 370
 371         panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
 372         if (!panel_mod)
 373                 return -ENOMEM;
 374
 375         mod = &panel_mod->base;
 376
 377         tilcdc_module_init(mod, "panel", &panel_module_ops);
 378
 379         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 380         if (IS_ERR(pinctrl))
 381                 dev_warn(&pdev->dev, "pins are not configured\n");
 382
 383
 384         panel_mod->timings = of_get_display_timings(node);
 385         if (!panel_mod->timings) {
 386                 dev_err(&pdev->dev, "could not get panel timings\n");
 387                 goto fail;
 388         }
 389
 390         panel_mod->info = of_get_panel_info(node);
 391         if (!panel_mod->info) {
 392                 dev_err(&pdev->dev, "could not get panel info\n");
 393                 goto fail;
 394         }
 395
 396         mod->preferred_bpp = panel_mod->info->bpp;
 397
 398         panel_mod->backlight = of_find_backlight_by_node(node);
 399         if (panel_mod->backlight)
 400                 dev_info(&pdev->dev, "found backlight\n");
 401
 402         return 0;
 403
 404 fail:
 405         panel_destroy(mod);
 406         return ret;
 407 }
 408
 409 static int panel_remove(struct platform_device *pdev)
 410 {
 411         return 0;
 412 }
 413
 414 static struct of_device_id panel_of_match[] = {
 415                 { .compatible = "ti,tilcdc,panel", },
 416                 { },
 417 };
 418
 419 struct platform_driver panel_driver = {
 420         .probe = panel_probe,
 421         .remove = panel_remove,
 422         .driver = {
 423                 .owner = THIS_MODULE,
 424                 .name = "panel",
 425                 .of_match_table = panel_of_match,
 426         },
 427 };
 428
 429 int __init tilcdc_panel_init(void)
 430 {
 431         return platform_driver_register(&panel_driver);
 432 }
 433
 434 void __exit tilcdc_panel_fini(void)
 435 {
 436         platform_driver_unregister(&panel_driver);
 437 }