kernel/drivers/gpu/drm/tilcdc/tilcdc_slave.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/i2c.h>
  19 #include <linux/pinctrl/pinmux.h>
  20 #include <linux/pinctrl/consumer.h>
  21 #include <drm/drm_encoder_slave.h>
  22
  23 #include "tilcdc_drv.h"
  24
  25 struct slave_module {
  26         struct tilcdc_module base;
  27         struct i2c_adapter *i2c;
  28 };
  29 #define to_slave_module(x) container_of(x, struct slave_module, base)
  30
  31 static const struct tilcdc_panel_info slave_info = {
  32                 .bpp                    = 16,
  33                 .ac_bias                = 255,
  34                 .ac_bias_intrpt         = 0,
  35                 .dma_burst_sz           = 16,
  36                 .fdd                    = 0x80,
  37                 .tft_alt_mode           = 0,
  38                 .sync_edge              = 0,
  39                 .sync_ctrl              = 1,
  40                 .raster_order           = 0,
  41 };
  42
  43
  44 /*
  45  * Encoder:
  46  */
  47
  48 struct slave_encoder {
  49         struct drm_encoder_slave base;
  50         struct slave_module *mod;
  51 };
  52 #define to_slave_encoder(x) container_of(to_encoder_slave(x), struct slave_encoder, base)
  53
  54 static inline struct drm_encoder_slave_funcs *
  55 get_slave_funcs(struct drm_encoder *enc)
  56 {
  57         return to_encoder_slave(enc)->slave_funcs;
  58 }
  59
  60 static void slave_encoder_destroy(struct drm_encoder *encoder)
  61 {
  62         struct slave_encoder *slave_encoder = to_slave_encoder(encoder);
  63         if (get_slave_funcs(encoder))
  64                 get_slave_funcs(encoder)->destroy(encoder);
  65         drm_encoder_cleanup(encoder);
  66         kfree(slave_encoder);
  67 }
  68
  69 static void slave_encoder_prepare(struct drm_encoder *encoder)
  70 {
  71         drm_i2c_encoder_prepare(encoder);
  72         tilcdc_crtc_set_panel_info(encoder->crtc, &slave_info);
  73 }
  74
  75 static bool slave_encoder_fixup(struct drm_encoder *encoder,
  76                 const struct drm_display_mode *mode,
  77                 struct drm_display_mode *adjusted_mode)
  78 {
  79         /*
  80          * tilcdc does not generate VESA-complient sync but aligns
  81          * VS on the second edge of HS instead of first edge.
  82          * We use adjusted_mode, to fixup sync by aligning both rising
  83          * edges and add HSKEW offset to let the slave encoder fix it up.
  84          */
  85         adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
  86         adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
  87
  88         if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
  89                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
  90                 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
  91         } else {
  92                 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
  93                 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
  94         }
  95
  96         return drm_i2c_encoder_mode_fixup(encoder, mode, adjusted_mode);
  97 }
  98
  99
 100 static const struct drm_encoder_funcs slave_encoder_funcs = {
 101                 .destroy        = slave_encoder_destroy,
 102 };
 103
 104 static const struct drm_encoder_helper_funcs slave_encoder_helper_funcs = {
 105                 .dpms           = drm_i2c_encoder_dpms,
 106                 .mode_fixup     = slave_encoder_fixup,
 107                 .prepare        = slave_encoder_prepare,
 108                 .commit         = drm_i2c_encoder_commit,
 109                 .mode_set       = drm_i2c_encoder_mode_set,
 110                 .save           = drm_i2c_encoder_save,
 111                 .restore        = drm_i2c_encoder_restore,
 112 };
 113
 114 static const struct i2c_board_info info = {
 115                 I2C_BOARD_INFO("tda998x", 0x70)
 116 };
 117
 118 static struct drm_encoder *slave_encoder_create(struct drm_device *dev,
 119                 struct slave_module *mod)
 120 {
 121         struct slave_encoder *slave_encoder;
 122         struct drm_encoder *encoder;
 123         int ret;
 124
 125         slave_encoder = kzalloc(sizeof(*slave_encoder), GFP_KERNEL);
 126         if (!slave_encoder) {
 127                 dev_err(dev->dev, "allocation failed\n");
 128                 return NULL;
 129         }
 130
 131         slave_encoder->mod = mod;
 132
 133         encoder = &slave_encoder->base.base;
 134         encoder->possible_crtcs = 1;
 135
 136         ret = drm_encoder_init(dev, encoder, &slave_encoder_funcs,
 137                         DRM_MODE_ENCODER_TMDS);
 138         if (ret)
 139                 goto fail;
 140
 141         drm_encoder_helper_add(encoder, &slave_encoder_helper_funcs);
 142
 143         ret = drm_i2c_encoder_init(dev, to_encoder_slave(encoder), mod->i2c, &info);
 144         if (ret)
 145                 goto fail;
 146
 147         return encoder;
 148
 149 fail:
 150         slave_encoder_destroy(encoder);
 151         return NULL;
 152 }
 153
 154 /*
 155  * Connector:
 156  */
 157
 158 struct slave_connector {
 159         struct drm_connector base;
 160
 161         struct drm_encoder *encoder;  /* our connected encoder */
 162         struct slave_module *mod;
 163 };
 164 #define to_slave_connector(x) container_of(x, struct slave_connector, base)
 165
 166 static void slave_connector_destroy(struct drm_connector *connector)
 167 {
 168         struct slave_connector *slave_connector = to_slave_connector(connector);
 169         drm_connector_unregister(connector);
 170         drm_connector_cleanup(connector);
 171         kfree(slave_connector);
 172 }
 173
 174 static enum drm_connector_status slave_connector_detect(
 175                 struct drm_connector *connector,
 176                 bool force)
 177 {
 178         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
 179         return get_slave_funcs(encoder)->detect(encoder, connector);
 180 }
 181
 182 static int slave_connector_get_modes(struct drm_connector *connector)
 183 {
 184         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
 185         return get_slave_funcs(encoder)->get_modes(encoder, connector);
 186 }
 187
 188 static int slave_connector_mode_valid(struct drm_connector *connector,
 189                   struct drm_display_mode *mode)
 190 {
 191         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
 192         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 193         int ret;
 194
 195         ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
 196         if (ret != MODE_OK)
 197                 return ret;
 198
 199         return get_slave_funcs(encoder)->mode_valid(encoder, mode);
 200 }
 201
 202 static struct drm_encoder *slave_connector_best_encoder(
 203                 struct drm_connector *connector)
 204 {
 205         struct slave_connector *slave_connector = to_slave_connector(connector);
 206         return slave_connector->encoder;
 207 }
 208
 209 static int slave_connector_set_property(struct drm_connector *connector,
 210                 struct drm_property *property, uint64_t value)
 211 {
 212         struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
 213         return get_slave_funcs(encoder)->set_property(encoder,
 214                         connector, property, value);
 215 }
 216
 217 static const struct drm_connector_funcs slave_connector_funcs = {
 218         .destroy            = slave_connector_destroy,
 219         .dpms               = drm_helper_connector_dpms,
 220         .detect             = slave_connector_detect,
 221         .fill_modes         = drm_helper_probe_single_connector_modes,
 222         .set_property       = slave_connector_set_property,
 223 };
 224
 225 static const struct drm_connector_helper_funcs slave_connector_helper_funcs = {
 226         .get_modes          = slave_connector_get_modes,
 227         .mode_valid         = slave_connector_mode_valid,
 228         .best_encoder       = slave_connector_best_encoder,
 229 };
 230
 231 static struct drm_connector *slave_connector_create(struct drm_device *dev,
 232                 struct slave_module *mod, struct drm_encoder *encoder)
 233 {
 234         struct slave_connector *slave_connector;
 235         struct drm_connector *connector;
 236         int ret;
 237
 238         slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL);
 239         if (!slave_connector) {
 240                 dev_err(dev->dev, "allocation failed\n");
 241                 return NULL;
 242         }
 243
 244         slave_connector->encoder = encoder;
 245         slave_connector->mod = mod;
 246
 247         connector = &slave_connector->base;
 248
 249         drm_connector_init(dev, connector, &slave_connector_funcs,
 250                         DRM_MODE_CONNECTOR_HDMIA);
 251         drm_connector_helper_add(connector, &slave_connector_helper_funcs);
 252
 253         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 254                         DRM_CONNECTOR_POLL_DISCONNECT;
 255
 256         connector->interlace_allowed = 0;
 257         connector->doublescan_allowed = 0;
 258
 259         get_slave_funcs(encoder)->create_resources(encoder, connector);
 260
 261         ret = drm_mode_connector_attach_encoder(connector, encoder);
 262         if (ret)
 263                 goto fail;
 264
 265         drm_connector_register(connector);
 266
 267         return connector;
 268
 269 fail:
 270         slave_connector_destroy(connector);
 271         return NULL;
 272 }
 273
 274 /*
 275  * Module:
 276  */
 277
 278 static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 279 {
 280         struct slave_module *slave_mod = to_slave_module(mod);
 281         struct tilcdc_drm_private *priv = dev->dev_private;
 282         struct drm_encoder *encoder;
 283         struct drm_connector *connector;
 284
 285         encoder = slave_encoder_create(dev, slave_mod);
 286         if (!encoder)
 287                 return -ENOMEM;
 288
 289         connector = slave_connector_create(dev, slave_mod, encoder);
 290         if (!connector)
 291                 return -ENOMEM;
 292
 293         priv->encoders[priv->num_encoders++] = encoder;
 294         priv->connectors[priv->num_connectors++] = connector;
 295
 296         return 0;
 297 }
 298
 299 static const struct tilcdc_module_ops slave_module_ops = {
 300                 .modeset_init = slave_modeset_init,
 301 };
 302
 303 /*
 304  * Device:
 305  */
 306
 307 static struct of_device_id slave_of_match[];
 308
 309 static int slave_probe(struct platform_device *pdev)
 310 {
 311         struct device_node *node = pdev->dev.of_node;
 312         struct device_node *i2c_node;
 313         struct slave_module *slave_mod;
 314         struct tilcdc_module *mod;
 315         struct pinctrl *pinctrl;
 316         uint32_t i2c_phandle;
 317         struct i2c_adapter *slavei2c;
 318         int ret = -EINVAL;
 319
 320         /* bail out early if no DT data: */
 321         if (!node) {
 322                 dev_err(&pdev->dev, "device-tree data is missing\n");
 323                 return -ENXIO;
 324         }
 325
 326         /* Bail out early if i2c not specified */
 327         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 328                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 329                 return ret;
 330         }
 331
 332         i2c_node = of_find_node_by_phandle(i2c_phandle);
 333         if (!i2c_node) {
 334                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 335                 return ret;
 336         }
 337
 338         /* but defer the probe if it can't be initialized it might come later */
 339         slavei2c = of_find_i2c_adapter_by_node(i2c_node);
 340         of_node_put(i2c_node);
 341
 342         if (!slavei2c) {
 343                 ret = -EPROBE_DEFER;
 344                 tilcdc_slave_probedefer(true);
 345                 dev_err(&pdev->dev, "could not get i2c\n");
 346                 return ret;
 347         }
 348
 349         slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL);
 350         if (!slave_mod) {
 351                 ret = -ENOMEM;
 352                 goto fail_adapter;
 353         }
 354
 355         mod = &slave_mod->base;
 356         pdev->dev.platform_data = mod;
 357
 358         mod->preferred_bpp = slave_info.bpp;
 359
 360         slave_mod->i2c = slavei2c;
 361
 362         tilcdc_module_init(mod, "slave", &slave_module_ops);
 363
 364         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 365         if (IS_ERR(pinctrl))
 366                 dev_warn(&pdev->dev, "pins are not configured\n");
 367
 368         tilcdc_slave_probedefer(false);
 369
 370         return 0;
 371
 372 fail_adapter:
 373         i2c_put_adapter(slavei2c);
 374         return ret;
 375 }
 376
 377 static int slave_remove(struct platform_device *pdev)
 378 {
 379         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 380         struct slave_module *slave_mod = to_slave_module(mod);
 381
 382         tilcdc_module_cleanup(mod);
 383         kfree(slave_mod);
 384
 385         return 0;
 386 }
 387
 388 static struct of_device_id slave_of_match[] = {
 389                 { .compatible = "ti,tilcdc,slave", },
 390                 { },
 391 };
 392
 393 struct platform_driver slave_driver = {
 394         .probe = slave_probe,
 395         .remove = slave_remove,
 396         .driver = {
 397                 .owner = THIS_MODULE,
 398                 .name = "slave",
 399                 .of_match_table = slave_of_match,
 400         },
 401 };
 402
 403 int __init tilcdc_slave_init(void)
 404 {
 405         return platform_driver_register(&slave_driver);
 406 }
 407
 408 void __exit tilcdc_slave_fini(void)
 409 {
 410         platform_driver_unregister(&slave_driver);
 411 }