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 platform_device *pdev;
  41
  42         struct regulator *vdds_dsi_reg;
  43         struct platform_device *dsidev;
  44
  45         struct mutex lock;
  46
  47         struct omap_video_timings timings;
  48         struct dss_lcd_mgr_config mgr_config;
  49         int data_lines;
  50
  51         struct omap_dss_device output;
  52 } dpi;
  53
  54 static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
  55 {
  56         /*
  57          * XXX we can't currently use DSI PLL for DPI with OMAP3, as the DSI PLL
  58          * would also be used for DISPC fclk. Meaning, when the DPI output is
  59          * disabled, DISPC clock will be disabled, and TV out will stop.
  60          */
  61         switch (omapdss_get_version()) {
  62         case OMAPDSS_VER_OMAP24xx:
  63         case OMAPDSS_VER_OMAP34xx_ES1:
  64         case OMAPDSS_VER_OMAP34xx_ES3:
  65         case OMAPDSS_VER_OMAP3630:
  66         case OMAPDSS_VER_AM35xx:
  67                 return NULL;
  68
  69         case OMAPDSS_VER_OMAP4430_ES1:
  70         case OMAPDSS_VER_OMAP4430_ES2:
  71         case OMAPDSS_VER_OMAP4:
  72                 switch (channel) {
  73                 case OMAP_DSS_CHANNEL_LCD:
  74                         return dsi_get_dsidev_from_id(0);
  75                 case OMAP_DSS_CHANNEL_LCD2:
  76                         return dsi_get_dsidev_from_id(1);
  77                 default:
  78                         return NULL;
  79                 }
  80
  81         case OMAPDSS_VER_OMAP5:
  82                 switch (channel) {
  83                 case OMAP_DSS_CHANNEL_LCD:
  84                         return dsi_get_dsidev_from_id(0);
  85                 case OMAP_DSS_CHANNEL_LCD3:
  86                         return dsi_get_dsidev_from_id(1);
  87                 default:
  88                         return NULL;
  89                 }
  90
  91         default:
  92                 return NULL;
  93         }
  94 }
  95
  96 static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)
  97 {
  98         switch (channel) {
  99         case OMAP_DSS_CHANNEL_LCD:
 100                 return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
 101         case OMAP_DSS_CHANNEL_LCD2:
 102                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
 103         default:
 104                 /* this shouldn't happen */
 105                 WARN_ON(1);
 106                 return OMAP_DSS_CLK_SRC_FCK;
 107         }
 108 }
 109
 110 struct dpi_clk_calc_ctx {
 111         struct platform_device *dsidev;
 112
 113         /* inputs */
 114
 115         unsigned long pck_min, pck_max;
 116
 117         /* outputs */
 118
 119         struct dsi_clock_info dsi_cinfo;
 120         unsigned long fck;
 121         struct dispc_clock_info dispc_cinfo;
 122 };
 123
 124 static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
 125                 unsigned long pck, void *data)
 126 {
 127         struct dpi_clk_calc_ctx *ctx = data;
 128
 129         /*
 130          * Odd dividers give us uneven duty cycle, causing problem when level
 131          * shifted. So skip all odd dividers when the pixel clock is on the
 132          * higher side.
 133          */
 134         if (ctx->pck_min >= 100000000) {
 135                 if (lckd > 1 && lckd % 2 != 0)
 136                         return false;
 137
 138                 if (pckd > 1 && pckd % 2 != 0)
 139                         return false;
 140         }
 141
 142         ctx->dispc_cinfo.lck_div = lckd;
 143         ctx->dispc_cinfo.pck_div = pckd;
 144         ctx->dispc_cinfo.lck = lck;
 145         ctx->dispc_cinfo.pck = pck;
 146
 147         return true;
 148 }
 149
 150
 151 static bool dpi_calc_hsdiv_cb(int regm_dispc, unsigned long dispc,
 152                 void *data)
 153 {
 154         struct dpi_clk_calc_ctx *ctx = data;
 155
 156         /*
 157          * Odd dividers give us uneven duty cycle, causing problem when level
 158          * shifted. So skip all odd dividers when the pixel clock is on the
 159          * higher side.
 160          */
 161         if (regm_dispc > 1 && regm_dispc % 2 != 0 && ctx->pck_min >= 100000000)
 162                 return false;
 163
 164         ctx->dsi_cinfo.regm_dispc = regm_dispc;
 165         ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc;
 166
 167         return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
 168                         dpi_calc_dispc_cb, ctx);
 169 }
 170
 171
 172 static bool dpi_calc_pll_cb(int regn, int regm, unsigned long fint,
 173                 unsigned long pll,
 174                 void *data)
 175 {
 176         struct dpi_clk_calc_ctx *ctx = data;
 177
 178         ctx->dsi_cinfo.regn = regn;
 179         ctx->dsi_cinfo.regm = regm;
 180         ctx->dsi_cinfo.fint = fint;
 181         ctx->dsi_cinfo.clkin4ddr = pll;
 182
 183         return dsi_hsdiv_calc(ctx->dsidev, pll, ctx->pck_min,
 184                         dpi_calc_hsdiv_cb, ctx);
 185 }
 186
 187 static bool dpi_calc_dss_cb(unsigned long fck, void *data)
 188 {
 189         struct dpi_clk_calc_ctx *ctx = data;
 190
 191         ctx->fck = fck;
 192
 193         return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 194                         dpi_calc_dispc_cb, ctx);
 195 }
 196
 197 static bool dpi_dsi_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 198 {
 199         unsigned long clkin;
 200         unsigned long pll_min, pll_max;
 201
 202         clkin = dsi_get_pll_clkin(dpi.dsidev);
 203
 204         memset(ctx, 0, sizeof(*ctx));
 205         ctx->dsidev = dpi.dsidev;
 206         ctx->pck_min = pck - 1000;
 207         ctx->pck_max = pck + 1000;
 208         ctx->dsi_cinfo.clkin = clkin;
 209
 210         pll_min = 0;
 211         pll_max = 0;
 212
 213         return dsi_pll_calc(dpi.dsidev, clkin,
 214                         pll_min, pll_max,
 215                         dpi_calc_pll_cb, ctx);
 216 }
 217
 218 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 219 {
 220         int i;
 221
 222         /*
 223          * DSS fck gives us very few possibilities, so finding a good pixel
 224          * clock may not be possible. We try multiple times to find the clock,
 225          * each time widening the pixel clock range we look for, up to
 226          * +/- ~15MHz.
 227          */
 228
 229         for (i = 0; i < 25; ++i) {
 230                 bool ok;
 231
 232                 memset(ctx, 0, sizeof(*ctx));
 233                 if (pck > 1000 * i * i * i)
 234                         ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
 235                 else
 236                         ctx->pck_min = 0;
 237                 ctx->pck_max = pck + 1000 * i * i * i;
 238
 239                 ok = dss_div_calc(pck, ctx->pck_min, dpi_calc_dss_cb, ctx);
 240                 if (ok)
 241                         return ok;
 242         }
 243
 244         return false;
 245 }
 246
 247
 248
 249 static int dpi_set_dsi_clk(enum omap_channel channel,
 250                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 251                 int *pck_div)
 252 {
 253         struct dpi_clk_calc_ctx ctx;
 254         int r;
 255         bool ok;
 256
 257         ok = dpi_dsi_clk_calc(pck_req, &ctx);
 258         if (!ok)
 259                 return -EINVAL;
 260
 261         r = dsi_pll_set_clock_div(dpi.dsidev, &ctx.dsi_cinfo);
 262         if (r)
 263                 return r;
 264
 265         dss_select_lcd_clk_source(channel,
 266                         dpi_get_alt_clk_src(channel));
 267
 268         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 269
 270         *fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 271         *lck_div = ctx.dispc_cinfo.lck_div;
 272         *pck_div = ctx.dispc_cinfo.pck_div;
 273
 274         return 0;
 275 }
 276
 277 static int dpi_set_dispc_clk(unsigned long pck_req, unsigned long *fck,
 278                 int *lck_div, int *pck_div)
 279 {
 280         struct dpi_clk_calc_ctx ctx;
 281         int r;
 282         bool ok;
 283
 284         ok = dpi_dss_clk_calc(pck_req, &ctx);
 285         if (!ok)
 286                 return -EINVAL;
 287
 288         r = dss_set_fck_rate(ctx.fck);
 289         if (r)
 290                 return r;
 291
 292         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 293
 294         *fck = ctx.fck;
 295         *lck_div = ctx.dispc_cinfo.lck_div;
 296         *pck_div = ctx.dispc_cinfo.pck_div;
 297
 298         return 0;
 299 }
 300
 301 static int dpi_set_mode(struct omap_overlay_manager *mgr)
 302 {
 303         struct omap_video_timings *t = &dpi.timings;
 304         int lck_div = 0, pck_div = 0;
 305         unsigned long fck = 0;
 306         unsigned long pck;
 307         int r = 0;
 308
 309         if (dpi.dsidev)
 310                 r = dpi_set_dsi_clk(mgr->id, t->pixelclock, &fck,
 311                                 &lck_div, &pck_div);
 312         else
 313                 r = dpi_set_dispc_clk(t->pixelclock, &fck,
 314                                 &lck_div, &pck_div);
 315         if (r)
 316                 return r;
 317
 318         pck = fck / lck_div / pck_div;
 319
 320         if (pck != t->pixelclock) {
 321                 DSSWARN("Could not find exact pixel clock. Requested %d Hz, got %lu Hz\n",
 322                         t->pixelclock, pck);
 323
 324                 t->pixelclock = pck;
 325         }
 326
 327         dss_mgr_set_timings(mgr, t);
 328
 329         return 0;
 330 }
 331
 332 static void dpi_config_lcd_manager(struct omap_overlay_manager *mgr)
 333 {
 334         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 335
 336         dpi.mgr_config.stallmode = false;
 337         dpi.mgr_config.fifohandcheck = false;
 338
 339         dpi.mgr_config.video_port_width = dpi.data_lines;
 340
 341         dpi.mgr_config.lcden_sig_polarity = 0;
 342
 343         dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
 344 }
 345
 346 static int dpi_display_enable(struct omap_dss_device *dssdev)
 347 {
 348         struct omap_dss_device *out = &dpi.output;
 349         int r;
 350
 351         mutex_lock(&dpi.lock);
 352
 353         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
 354                 DSSERR("no VDSS_DSI regulator\n");
 355                 r = -ENODEV;
 356                 goto err_no_reg;
 357         }
 358
 359         if (out == NULL || out->manager == NULL) {
 360                 DSSERR("failed to enable display: no output/manager\n");
 361                 r = -ENODEV;
 362                 goto err_no_out_mgr;
 363         }
 364
 365         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 366                 r = regulator_enable(dpi.vdds_dsi_reg);
 367                 if (r)
 368                         goto err_reg_enable;
 369         }
 370
 371         r = dispc_runtime_get();
 372         if (r)
 373                 goto err_get_dispc;
 374
 375         r = dss_dpi_select_source(out->manager->id);
 376         if (r)
 377                 goto err_src_sel;
 378
 379         if (dpi.dsidev) {
 380                 r = dsi_runtime_get(dpi.dsidev);
 381                 if (r)
 382                         goto err_get_dsi;
 383
 384                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 385                 if (r)
 386                         goto err_dsi_pll_init;
 387         }
 388
 389         r = dpi_set_mode(out->manager);
 390         if (r)
 391                 goto err_set_mode;
 392
 393         dpi_config_lcd_manager(out->manager);
 394
 395         mdelay(2);
 396
 397         r = dss_mgr_enable(out->manager);
 398         if (r)
 399                 goto err_mgr_enable;
 400
 401         mutex_unlock(&dpi.lock);
 402
 403         return 0;
 404
 405 err_mgr_enable:
 406 err_set_mode:
 407         if (dpi.dsidev)
 408                 dsi_pll_uninit(dpi.dsidev, true);
 409 err_dsi_pll_init:
 410         if (dpi.dsidev)
 411                 dsi_runtime_put(dpi.dsidev);
 412 err_get_dsi:
 413 err_src_sel:
 414         dispc_runtime_put();
 415 err_get_dispc:
 416         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 417                 regulator_disable(dpi.vdds_dsi_reg);
 418 err_reg_enable:
 419 err_no_out_mgr:
 420 err_no_reg:
 421         mutex_unlock(&dpi.lock);
 422         return r;
 423 }
 424
 425 static void dpi_display_disable(struct omap_dss_device *dssdev)
 426 {
 427         struct omap_overlay_manager *mgr = dpi.output.manager;
 428
 429         mutex_lock(&dpi.lock);
 430
 431         dss_mgr_disable(mgr);
 432
 433         if (dpi.dsidev) {
 434                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 435                 dsi_pll_uninit(dpi.dsidev, true);
 436                 dsi_runtime_put(dpi.dsidev);
 437         }
 438
 439         dispc_runtime_put();
 440
 441         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 442                 regulator_disable(dpi.vdds_dsi_reg);
 443
 444         mutex_unlock(&dpi.lock);
 445 }
 446
 447 static void dpi_set_timings(struct omap_dss_device *dssdev,
 448                 struct omap_video_timings *timings)
 449 {
 450         DSSDBG("dpi_set_timings\n");
 451
 452         mutex_lock(&dpi.lock);
 453
 454         dpi.timings = *timings;
 455
 456         mutex_unlock(&dpi.lock);
 457 }
 458
 459 static void dpi_get_timings(struct omap_dss_device *dssdev,
 460                 struct omap_video_timings *timings)
 461 {
 462         mutex_lock(&dpi.lock);
 463
 464         *timings = dpi.timings;
 465
 466         mutex_unlock(&dpi.lock);
 467 }
 468
 469 static int dpi_check_timings(struct omap_dss_device *dssdev,
 470                         struct omap_video_timings *timings)
 471 {
 472         struct omap_overlay_manager *mgr = dpi.output.manager;
 473         int lck_div, pck_div;
 474         unsigned long fck;
 475         unsigned long pck;
 476         struct dpi_clk_calc_ctx ctx;
 477         bool ok;
 478
 479         if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
 480                 return -EINVAL;
 481
 482         if (timings->pixelclock == 0)
 483                 return -EINVAL;
 484
 485         if (dpi.dsidev) {
 486                 ok = dpi_dsi_clk_calc(timings->pixelclock, &ctx);
 487                 if (!ok)
 488                         return -EINVAL;
 489
 490                 fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 491         } else {
 492                 ok = dpi_dss_clk_calc(timings->pixelclock, &ctx);
 493                 if (!ok)
 494                         return -EINVAL;
 495
 496                 fck = ctx.fck;
 497         }
 498
 499         lck_div = ctx.dispc_cinfo.lck_div;
 500         pck_div = ctx.dispc_cinfo.pck_div;
 501
 502         pck = fck / lck_div / pck_div;
 503
 504         timings->pixelclock = pck;
 505
 506         return 0;
 507 }
 508
 509 static void dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 510 {
 511         mutex_lock(&dpi.lock);
 512
 513         dpi.data_lines = data_lines;
 514
 515         mutex_unlock(&dpi.lock);
 516 }
 517
 518 static int dpi_verify_dsi_pll(struct platform_device *dsidev)
 519 {
 520         int r;
 521
 522         /* do initial setup with the PLL to see if it is operational */
 523
 524         r = dsi_runtime_get(dsidev);
 525         if (r)
 526                 return r;
 527
 528         r = dsi_pll_init(dsidev, 0, 1);
 529         if (r) {
 530                 dsi_runtime_put(dsidev);
 531                 return r;
 532         }
 533
 534         dsi_pll_uninit(dsidev, true);
 535         dsi_runtime_put(dsidev);
 536
 537         return 0;
 538 }
 539
 540 static int dpi_init_regulator(void)
 541 {
 542         struct regulator *vdds_dsi;
 543
 544         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 545                 return 0;
 546
 547         if (dpi.vdds_dsi_reg)
 548                 return 0;
 549
 550         vdds_dsi = devm_regulator_get(&dpi.pdev->dev, "vdds_dsi");
 551         if (IS_ERR(vdds_dsi)) {
 552                 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
 553                         DSSERR("can't get VDDS_DSI regulator\n");
 554                 return PTR_ERR(vdds_dsi);
 555         }
 556
 557         dpi.vdds_dsi_reg = vdds_dsi;
 558
 559         return 0;
 560 }
 561
 562 static void dpi_init_pll(void)
 563 {
 564         struct platform_device *dsidev;
 565
 566         if (dpi.dsidev)
 567                 return;
 568
 569         dsidev = dpi_get_dsidev(dpi.output.dispc_channel);
 570         if (!dsidev)
 571                 return;
 572
 573         if (dpi_verify_dsi_pll(dsidev)) {
 574                 DSSWARN("DSI PLL not operational\n");
 575                 return;
 576         }
 577
 578         dpi.dsidev = dsidev;
 579 }
 580
 581 /*
 582  * Return a hardcoded channel for the DPI output. This should work for
 583  * current use cases, but this can be later expanded to either resolve
 584  * the channel in some more dynamic manner, or get the channel as a user
 585  * parameter.
 586  */
 587 static enum omap_channel dpi_get_channel(void)
 588 {
 589         switch (omapdss_get_version()) {
 590         case OMAPDSS_VER_OMAP24xx:
 591         case OMAPDSS_VER_OMAP34xx_ES1:
 592         case OMAPDSS_VER_OMAP34xx_ES3:
 593         case OMAPDSS_VER_OMAP3630:
 594         case OMAPDSS_VER_AM35xx:
 595                 return OMAP_DSS_CHANNEL_LCD;
 596
 597         case OMAPDSS_VER_OMAP4430_ES1:
 598         case OMAPDSS_VER_OMAP4430_ES2:
 599         case OMAPDSS_VER_OMAP4:
 600                 return OMAP_DSS_CHANNEL_LCD2;
 601
 602         case OMAPDSS_VER_OMAP5:
 603                 return OMAP_DSS_CHANNEL_LCD3;
 604
 605         default:
 606                 DSSWARN("unsupported DSS version\n");
 607                 return OMAP_DSS_CHANNEL_LCD;
 608         }
 609 }
 610
 611 static int dpi_connect(struct omap_dss_device *dssdev,
 612                 struct omap_dss_device *dst)
 613 {
 614         struct omap_overlay_manager *mgr;
 615         int r;
 616
 617         r = dpi_init_regulator();
 618         if (r)
 619                 return r;
 620
 621         dpi_init_pll();
 622
 623         mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
 624         if (!mgr)
 625                 return -ENODEV;
 626
 627         r = dss_mgr_connect(mgr, dssdev);
 628         if (r)
 629                 return r;
 630
 631         r = omapdss_output_set_device(dssdev, dst);
 632         if (r) {
 633                 DSSERR("failed to connect output to new device: %s\n",
 634                                 dst->name);
 635                 dss_mgr_disconnect(mgr, dssdev);
 636                 return r;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static void dpi_disconnect(struct omap_dss_device *dssdev,
 643                 struct omap_dss_device *dst)
 644 {
 645         WARN_ON(dst != dssdev->dst);
 646
 647         if (dst != dssdev->dst)
 648                 return;
 649
 650         omapdss_output_unset_device(dssdev);
 651
 652         if (dssdev->manager)
 653                 dss_mgr_disconnect(dssdev->manager, dssdev);
 654 }
 655
 656 static const struct omapdss_dpi_ops dpi_ops = {
 657         .connect = dpi_connect,
 658         .disconnect = dpi_disconnect,
 659
 660         .enable = dpi_display_enable,
 661         .disable = dpi_display_disable,
 662
 663         .check_timings = dpi_check_timings,
 664         .set_timings = dpi_set_timings,
 665         .get_timings = dpi_get_timings,
 666
 667         .set_data_lines = dpi_set_data_lines,
 668 };
 669
 670 static void dpi_init_output(struct platform_device *pdev)
 671 {
 672         struct omap_dss_device *out = &dpi.output;
 673
 674         out->dev = &pdev->dev;
 675         out->id = OMAP_DSS_OUTPUT_DPI;
 676         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 677         out->name = "dpi.0";
 678         out->dispc_channel = dpi_get_channel();
 679         out->ops.dpi = &dpi_ops;
 680         out->owner = THIS_MODULE;
 681
 682         omapdss_register_output(out);
 683 }
 684
 685 static void __exit dpi_uninit_output(struct platform_device *pdev)
 686 {
 687         struct omap_dss_device *out = &dpi.output;
 688
 689         omapdss_unregister_output(out);
 690 }
 691
 692 static int omap_dpi_probe(struct platform_device *pdev)
 693 {
 694         dpi.pdev = pdev;
 695
 696         mutex_init(&dpi.lock);
 697
 698         dpi_init_output(pdev);
 699
 700         return 0;
 701 }
 702
 703 static int __exit omap_dpi_remove(struct platform_device *pdev)
 704 {
 705         dpi_uninit_output(pdev);
 706
 707         return 0;
 708 }
 709
 710 static struct platform_driver omap_dpi_driver = {
 711         .probe          = omap_dpi_probe,
 712         .remove         = __exit_p(omap_dpi_remove),
 713         .driver         = {
 714                 .name   = "omapdss_dpi",
 715                 .owner  = THIS_MODULE,
 716         },
 717 };
 718
 719 int __init dpi_init_platform_driver(void)
 720 {
 721         return platform_driver_register(&omap_dpi_driver);
 722 }
 723
 724 void __exit dpi_uninit_platform_driver(void)
 725 {
 726         platform_driver_unregister(&omap_dpi_driver);
 727 }