drivers/video/omap2/dss/dpi.c

   1 /*
   2  * linux/drivers/video/omap2/dss/dpi.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * Some code and ideas taken from drivers/video/omap/ driver
   8  * by Imre Deak.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #define DSS_SUBSYS_NAME "DPI"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/delay.h>
  27 #include <linux/export.h>
  28 #include <linux/err.h>
  29 #include <linux/errno.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/string.h>
  33
  34 #include <video/omapdss.h>
  35
  36 #include "dss.h"
  37 #include "dss_features.h"
  38
  39 static struct {
  40         struct regulator *vdds_dsi_reg;
  41         struct platform_device *dsidev;
  42
  43         struct mutex lock;
  44
  45         struct omap_video_timings timings;
  46         struct dss_lcd_mgr_config mgr_config;
  47         int data_lines;
  48
  49         struct omap_dss_output output;
  50 } dpi;
  51
  52 static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
  53 {
  54         switch (channel) {
  55         case OMAP_DSS_CHANNEL_LCD:
  56                 return dsi_get_dsidev_from_id(0);
  57         case OMAP_DSS_CHANNEL_LCD2:
  58                 return dsi_get_dsidev_from_id(1);
  59         default:
  60                 return NULL;
  61         }
  62 }
  63
  64 static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)
  65 {
  66         switch (channel) {
  67         case OMAP_DSS_CHANNEL_LCD:
  68                 return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
  69         case OMAP_DSS_CHANNEL_LCD2:
  70                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
  71         default:
  72                 /* this shouldn't happen */
  73                 WARN_ON(1);
  74                 return OMAP_DSS_CLK_SRC_FCK;
  75         }
  76 }
  77
  78 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
  79                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  80                 int *pck_div)
  81 {
  82         struct omap_overlay_manager *mgr = dssdev->output->manager;
  83         struct dsi_clock_info dsi_cinfo;
  84         struct dispc_clock_info dispc_cinfo;
  85         int r;
  86
  87         r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
  88                         &dispc_cinfo);
  89         if (r)
  90                 return r;
  91
  92         r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
  93         if (r)
  94                 return r;
  95
  96         dss_select_lcd_clk_source(mgr->id,
  97                         dpi_get_alt_clk_src(mgr->id));
  98
  99         dpi.mgr_config.clock_info = dispc_cinfo;
 100
 101         *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 102         *lck_div = dispc_cinfo.lck_div;
 103         *pck_div = dispc_cinfo.pck_div;
 104
 105         return 0;
 106 }
 107
 108 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
 109                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 110                 int *pck_div)
 111 {
 112         struct dss_clock_info dss_cinfo;
 113         struct dispc_clock_info dispc_cinfo;
 114         int r;
 115
 116         r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
 117         if (r)
 118                 return r;
 119
 120         r = dss_set_clock_div(&dss_cinfo);
 121         if (r)
 122                 return r;
 123
 124         dpi.mgr_config.clock_info = dispc_cinfo;
 125
 126         *fck = dss_cinfo.fck;
 127         *lck_div = dispc_cinfo.lck_div;
 128         *pck_div = dispc_cinfo.pck_div;
 129
 130         return 0;
 131 }
 132
 133 static int dpi_set_mode(struct omap_dss_device *dssdev)
 134 {
 135         struct omap_video_timings *t = &dpi.timings;
 136         struct omap_overlay_manager *mgr = dssdev->output->manager;
 137         int lck_div = 0, pck_div = 0;
 138         unsigned long fck = 0;
 139         unsigned long pck;
 140         int r = 0;
 141
 142         if (dpi.dsidev)
 143                 r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
 144                                 &lck_div, &pck_div);
 145         else
 146                 r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
 147                                 &lck_div, &pck_div);
 148         if (r)
 149                 return r;
 150
 151         pck = fck / lck_div / pck_div / 1000;
 152
 153         if (pck != t->pixel_clock) {
 154                 DSSWARN("Could not find exact pixel clock. "
 155                                 "Requested %d kHz, got %lu kHz\n",
 156                                 t->pixel_clock, pck);
 157
 158                 t->pixel_clock = pck;
 159         }
 160
 161         dss_mgr_set_timings(mgr, t);
 162
 163         return 0;
 164 }
 165
 166 static void dpi_config_lcd_manager(struct omap_dss_device *dssdev)
 167 {
 168         struct omap_overlay_manager *mgr = dssdev->output->manager;
 169
 170         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 171
 172         dpi.mgr_config.stallmode = false;
 173         dpi.mgr_config.fifohandcheck = false;
 174
 175         dpi.mgr_config.video_port_width = dpi.data_lines;
 176
 177         dpi.mgr_config.lcden_sig_polarity = 0;
 178
 179         dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
 180 }
 181
 182 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 183 {
 184         struct omap_dss_output *out = dssdev->output;
 185         int r;
 186
 187         mutex_lock(&dpi.lock);
 188
 189         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
 190                 DSSERR("no VDSS_DSI regulator\n");
 191                 r = -ENODEV;
 192                 goto err_no_reg;
 193         }
 194
 195         if (out == NULL || out->manager == NULL) {
 196                 DSSERR("failed to enable display: no output/manager\n");
 197                 r = -ENODEV;
 198                 goto err_no_out_mgr;
 199         }
 200
 201         r = omap_dss_start_device(dssdev);
 202         if (r) {
 203                 DSSERR("failed to start device\n");
 204                 goto err_start_dev;
 205         }
 206
 207         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 208                 r = regulator_enable(dpi.vdds_dsi_reg);
 209                 if (r)
 210                         goto err_reg_enable;
 211         }
 212
 213         r = dispc_runtime_get();
 214         if (r)
 215                 goto err_get_dispc;
 216
 217         r = dss_dpi_select_source(dssdev->channel);
 218         if (r)
 219                 goto err_src_sel;
 220
 221         if (dpi.dsidev) {
 222                 r = dsi_runtime_get(dpi.dsidev);
 223                 if (r)
 224                         goto err_get_dsi;
 225
 226                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 227                 if (r)
 228                         goto err_dsi_pll_init;
 229         }
 230
 231         r = dpi_set_mode(dssdev);
 232         if (r)
 233                 goto err_set_mode;
 234
 235         dpi_config_lcd_manager(dssdev);
 236
 237         mdelay(2);
 238
 239         r = dss_mgr_enable(out->manager);
 240         if (r)
 241                 goto err_mgr_enable;
 242
 243         mutex_unlock(&dpi.lock);
 244
 245         return 0;
 246
 247 err_mgr_enable:
 248 err_set_mode:
 249         if (dpi.dsidev)
 250                 dsi_pll_uninit(dpi.dsidev, true);
 251 err_dsi_pll_init:
 252         if (dpi.dsidev)
 253                 dsi_runtime_put(dpi.dsidev);
 254 err_get_dsi:
 255 err_src_sel:
 256         dispc_runtime_put();
 257 err_get_dispc:
 258         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 259                 regulator_disable(dpi.vdds_dsi_reg);
 260 err_reg_enable:
 261         omap_dss_stop_device(dssdev);
 262 err_start_dev:
 263 err_no_out_mgr:
 264 err_no_reg:
 265         mutex_unlock(&dpi.lock);
 266         return r;
 267 }
 268 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 269
 270 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 271 {
 272         struct omap_overlay_manager *mgr = dssdev->output->manager;
 273
 274         mutex_lock(&dpi.lock);
 275
 276         dss_mgr_disable(mgr);
 277
 278         if (dpi.dsidev) {
 279                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 280                 dsi_pll_uninit(dpi.dsidev, true);
 281                 dsi_runtime_put(dpi.dsidev);
 282         }
 283
 284         dispc_runtime_put();
 285
 286         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 287                 regulator_disable(dpi.vdds_dsi_reg);
 288
 289         omap_dss_stop_device(dssdev);
 290
 291         mutex_unlock(&dpi.lock);
 292 }
 293 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 294
 295 void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
 296                 struct omap_video_timings *timings)
 297 {
 298         DSSDBG("dpi_set_timings\n");
 299
 300         mutex_lock(&dpi.lock);
 301
 302         dpi.timings = *timings;
 303
 304         mutex_unlock(&dpi.lock);
 305 }
 306 EXPORT_SYMBOL(omapdss_dpi_set_timings);
 307
 308 int dpi_check_timings(struct omap_dss_device *dssdev,
 309                         struct omap_video_timings *timings)
 310 {
 311         int r;
 312         struct omap_overlay_manager *mgr = dssdev->output->manager;
 313         int lck_div, pck_div;
 314         unsigned long fck;
 315         unsigned long pck;
 316         struct dispc_clock_info dispc_cinfo;
 317
 318         if (dss_mgr_check_timings(mgr, timings))
 319                 return -EINVAL;
 320
 321         if (timings->pixel_clock == 0)
 322                 return -EINVAL;
 323
 324         if (dpi.dsidev) {
 325                 struct dsi_clock_info dsi_cinfo;
 326                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
 327                                 timings->pixel_clock * 1000,
 328                                 &dsi_cinfo, &dispc_cinfo);
 329
 330                 if (r)
 331                         return r;
 332
 333                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 334         } else {
 335                 struct dss_clock_info dss_cinfo;
 336                 r = dss_calc_clock_div(timings->pixel_clock * 1000,
 337                                 &dss_cinfo, &dispc_cinfo);
 338
 339                 if (r)
 340                         return r;
 341
 342                 fck = dss_cinfo.fck;
 343         }
 344
 345         lck_div = dispc_cinfo.lck_div;
 346         pck_div = dispc_cinfo.pck_div;
 347
 348         pck = fck / lck_div / pck_div / 1000;
 349
 350         timings->pixel_clock = pck;
 351
 352         return 0;
 353 }
 354 EXPORT_SYMBOL(dpi_check_timings);
 355
 356 void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 357 {
 358         mutex_lock(&dpi.lock);
 359
 360         dpi.data_lines = data_lines;
 361
 362         mutex_unlock(&dpi.lock);
 363 }
 364 EXPORT_SYMBOL(omapdss_dpi_set_data_lines);
 365
 366 static int __init dpi_verify_dsi_pll(struct platform_device *dsidev)
 367 {
 368         int r;
 369
 370         /* do initial setup with the PLL to see if it is operational */
 371
 372         r = dsi_runtime_get(dsidev);
 373         if (r)
 374                 return r;
 375
 376         r = dsi_pll_init(dsidev, 0, 1);
 377         if (r) {
 378                 dsi_runtime_put(dsidev);
 379                 return r;
 380         }
 381
 382         dsi_pll_uninit(dsidev, true);
 383         dsi_runtime_put(dsidev);
 384
 385         return 0;
 386 }
 387
 388 static int __init dpi_init_display(struct omap_dss_device *dssdev)
 389 {
 390         struct platform_device *dsidev;
 391
 392         DSSDBG("init_display\n");
 393
 394         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) &&
 395                                         dpi.vdds_dsi_reg == NULL) {
 396                 struct regulator *vdds_dsi;
 397
 398                 vdds_dsi = dss_get_vdds_dsi();
 399
 400                 if (IS_ERR(vdds_dsi)) {
 401                         DSSERR("can't get VDDS_DSI regulator\n");
 402                         return PTR_ERR(vdds_dsi);
 403                 }
 404
 405                 dpi.vdds_dsi_reg = vdds_dsi;
 406         }
 407
 408         /*
 409          * XXX We shouldn't need dssdev->channel for this. The dsi pll clock
 410          * source for DPI is SoC integration detail, not something that should
 411          * be configured in the dssdev
 412          */
 413         dsidev = dpi_get_dsidev(dssdev->channel);
 414
 415         if (dsidev && dpi_verify_dsi_pll(dsidev)) {
 416                 dsidev = NULL;
 417                 DSSWARN("DSI PLL not operational\n");
 418         }
 419
 420         if (dsidev)
 421                 DSSDBG("using DSI PLL for DPI clock\n");
 422
 423         dpi.dsidev = dsidev;
 424
 425         return 0;
 426 }
 427
 428 static struct omap_dss_device * __init dpi_find_dssdev(struct platform_device *pdev)
 429 {
 430         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 431         const char *def_disp_name = omapdss_get_default_display_name();
 432         struct omap_dss_device *def_dssdev;
 433         int i;
 434
 435         def_dssdev = NULL;
 436
 437         for (i = 0; i < pdata->num_devices; ++i) {
 438                 struct omap_dss_device *dssdev = pdata->devices[i];
 439
 440                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 441                         continue;
 442
 443                 if (def_dssdev == NULL)
 444                         def_dssdev = dssdev;
 445
 446                 if (def_disp_name != NULL &&
 447                                 strcmp(dssdev->name, def_disp_name) == 0) {
 448                         def_dssdev = dssdev;
 449                         break;
 450                 }
 451         }
 452
 453         return def_dssdev;
 454 }
 455
 456 static void __init dpi_probe_pdata(struct platform_device *dpidev)
 457 {
 458         struct omap_dss_device *plat_dssdev;
 459         struct omap_dss_device *dssdev;
 460         int r;
 461
 462         plat_dssdev = dpi_find_dssdev(dpidev);
 463
 464         if (!plat_dssdev)
 465                 return;
 466
 467         dssdev = dss_alloc_and_init_device(&dpidev->dev);
 468         if (!dssdev)
 469                 return;
 470
 471         dss_copy_device_pdata(dssdev, plat_dssdev);
 472
 473         r = dpi_init_display(dssdev);
 474         if (r) {
 475                 DSSERR("device %s init failed: %d\n", dssdev->name, r);
 476                 dss_put_device(dssdev);
 477                 return;
 478         }
 479
 480         r = omapdss_output_set_device(&dpi.output, dssdev);
 481         if (r) {
 482                 DSSERR("failed to connect output to new device: %s\n",
 483                                 dssdev->name);
 484                 dss_put_device(dssdev);
 485                 return;
 486         }
 487
 488         r = dss_add_device(dssdev);
 489         if (r) {
 490                 DSSERR("device %s register failed: %d\n", dssdev->name, r);
 491                 omapdss_output_unset_device(&dpi.output);
 492                 dss_put_device(dssdev);
 493                 return;
 494         }
 495 }
 496
 497 static void __init dpi_init_output(struct platform_device *pdev)
 498 {
 499         struct omap_dss_output *out = &dpi.output;
 500
 501         out->pdev = pdev;
 502         out->id = OMAP_DSS_OUTPUT_DPI;
 503         out->type = OMAP_DISPLAY_TYPE_DPI;
 504
 505         dss_register_output(out);
 506 }
 507
 508 static void __exit dpi_uninit_output(struct platform_device *pdev)
 509 {
 510         struct omap_dss_output *out = &dpi.output;
 511
 512         dss_unregister_output(out);
 513 }
 514
 515 static int __init omap_dpi_probe(struct platform_device *pdev)
 516 {
 517         mutex_init(&dpi.lock);
 518
 519         dpi_init_output(pdev);
 520
 521         dpi_probe_pdata(pdev);
 522
 523         return 0;
 524 }
 525
 526 static int __exit omap_dpi_remove(struct platform_device *pdev)
 527 {
 528         dss_unregister_child_devices(&pdev->dev);
 529
 530         dpi_uninit_output(pdev);
 531
 532         return 0;
 533 }
 534
 535 static struct platform_driver omap_dpi_driver = {
 536         .remove         = __exit_p(omap_dpi_remove),
 537         .driver         = {
 538                 .name   = "omapdss_dpi",
 539                 .owner  = THIS_MODULE,
 540         },
 541 };
 542
 543 int __init dpi_init_platform_driver(void)
 544 {
 545         return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
 546 }
 547
 548 void __exit dpi_uninit_platform_driver(void)
 549 {
 550         platform_driver_unregister(&omap_dpi_driver);
 551 }