drivers/video/fbdev/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 #include <linux/of.h>
  34
  35 #include <video/omapdss.h>
  36
  37 #include "dss.h"
  38 #include "dss_features.h"
  39
  40 struct dpi_data {
  41         struct platform_device *pdev;
  42
  43         struct regulator *vdds_dsi_reg;
  44         struct platform_device *dsidev;
  45
  46         struct mutex lock;
  47
  48         struct omap_video_timings timings;
  49         struct dss_lcd_mgr_config mgr_config;
  50         int data_lines;
  51
  52         struct omap_dss_device output;
  53
  54         bool port_initialized;
  55 };
  56
  57 static struct dpi_data dpi_data;
  58
  59 static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
  60 {
  61         /*
  62          * XXX we can't currently use DSI PLL for DPI with OMAP3, as the DSI PLL
  63          * would also be used for DISPC fclk. Meaning, when the DPI output is
  64          * disabled, DISPC clock will be disabled, and TV out will stop.
  65          */
  66         switch (omapdss_get_version()) {
  67         case OMAPDSS_VER_OMAP24xx:
  68         case OMAPDSS_VER_OMAP34xx_ES1:
  69         case OMAPDSS_VER_OMAP34xx_ES3:
  70         case OMAPDSS_VER_OMAP3630:
  71         case OMAPDSS_VER_AM35xx:
  72         case OMAPDSS_VER_AM43xx:
  73                 return NULL;
  74
  75         case OMAPDSS_VER_OMAP4430_ES1:
  76         case OMAPDSS_VER_OMAP4430_ES2:
  77         case OMAPDSS_VER_OMAP4:
  78                 switch (channel) {
  79                 case OMAP_DSS_CHANNEL_LCD:
  80                         return dsi_get_dsidev_from_id(0);
  81                 case OMAP_DSS_CHANNEL_LCD2:
  82                         return dsi_get_dsidev_from_id(1);
  83                 default:
  84                         return NULL;
  85                 }
  86
  87         case OMAPDSS_VER_OMAP5:
  88                 switch (channel) {
  89                 case OMAP_DSS_CHANNEL_LCD:
  90                         return dsi_get_dsidev_from_id(0);
  91                 case OMAP_DSS_CHANNEL_LCD3:
  92                         return dsi_get_dsidev_from_id(1);
  93                 default:
  94                         return NULL;
  95                 }
  96
  97         default:
  98                 return NULL;
  99         }
 100 }
 101
 102 static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)
 103 {
 104         switch (channel) {
 105         case OMAP_DSS_CHANNEL_LCD:
 106                 return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
 107         case OMAP_DSS_CHANNEL_LCD2:
 108                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
 109         case OMAP_DSS_CHANNEL_LCD3:
 110                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
 111         default:
 112                 /* this shouldn't happen */
 113                 WARN_ON(1);
 114                 return OMAP_DSS_CLK_SRC_FCK;
 115         }
 116 }
 117
 118 struct dpi_clk_calc_ctx {
 119         struct platform_device *dsidev;
 120
 121         /* inputs */
 122
 123         unsigned long pck_min, pck_max;
 124
 125         /* outputs */
 126
 127         struct dsi_clock_info dsi_cinfo;
 128         unsigned long fck;
 129         struct dispc_clock_info dispc_cinfo;
 130 };
 131
 132 static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
 133                 unsigned long pck, void *data)
 134 {
 135         struct dpi_clk_calc_ctx *ctx = data;
 136
 137         /*
 138          * Odd dividers give us uneven duty cycle, causing problem when level
 139          * shifted. So skip all odd dividers when the pixel clock is on the
 140          * higher side.
 141          */
 142         if (ctx->pck_min >= 100000000) {
 143                 if (lckd > 1 && lckd % 2 != 0)
 144                         return false;
 145
 146                 if (pckd > 1 && pckd % 2 != 0)
 147                         return false;
 148         }
 149
 150         ctx->dispc_cinfo.lck_div = lckd;
 151         ctx->dispc_cinfo.pck_div = pckd;
 152         ctx->dispc_cinfo.lck = lck;
 153         ctx->dispc_cinfo.pck = pck;
 154
 155         return true;
 156 }
 157
 158
 159 static bool dpi_calc_hsdiv_cb(int regm_dispc, unsigned long dispc,
 160                 void *data)
 161 {
 162         struct dpi_clk_calc_ctx *ctx = data;
 163
 164         /*
 165          * Odd dividers give us uneven duty cycle, causing problem when level
 166          * shifted. So skip all odd dividers when the pixel clock is on the
 167          * higher side.
 168          */
 169         if (regm_dispc > 1 && regm_dispc % 2 != 0 && ctx->pck_min >= 100000000)
 170                 return false;
 171
 172         ctx->dsi_cinfo.regm_dispc = regm_dispc;
 173         ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc;
 174
 175         return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
 176                         dpi_calc_dispc_cb, ctx);
 177 }
 178
 179
 180 static bool dpi_calc_pll_cb(int regn, int regm, unsigned long fint,
 181                 unsigned long pll,
 182                 void *data)
 183 {
 184         struct dpi_clk_calc_ctx *ctx = data;
 185
 186         ctx->dsi_cinfo.regn = regn;
 187         ctx->dsi_cinfo.regm = regm;
 188         ctx->dsi_cinfo.fint = fint;
 189         ctx->dsi_cinfo.clkin4ddr = pll;
 190
 191         return dsi_hsdiv_calc(ctx->dsidev, pll, ctx->pck_min,
 192                         dpi_calc_hsdiv_cb, ctx);
 193 }
 194
 195 static bool dpi_calc_dss_cb(unsigned long fck, void *data)
 196 {
 197         struct dpi_clk_calc_ctx *ctx = data;
 198
 199         ctx->fck = fck;
 200
 201         return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 202                         dpi_calc_dispc_cb, ctx);
 203 }
 204
 205 static bool dpi_dsi_clk_calc(struct dpi_data *dpi, unsigned long pck,
 206                 struct dpi_clk_calc_ctx *ctx)
 207 {
 208         unsigned long clkin;
 209         unsigned long pll_min, pll_max;
 210
 211         clkin = dsi_get_pll_clkin(dpi->dsidev);
 212
 213         memset(ctx, 0, sizeof(*ctx));
 214         ctx->dsidev = dpi->dsidev;
 215         ctx->pck_min = pck - 1000;
 216         ctx->pck_max = pck + 1000;
 217         ctx->dsi_cinfo.clkin = clkin;
 218
 219         pll_min = 0;
 220         pll_max = 0;
 221
 222         return dsi_pll_calc(dpi->dsidev, clkin,
 223                         pll_min, pll_max,
 224                         dpi_calc_pll_cb, ctx);
 225 }
 226
 227 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 228 {
 229         int i;
 230
 231         /*
 232          * DSS fck gives us very few possibilities, so finding a good pixel
 233          * clock may not be possible. We try multiple times to find the clock,
 234          * each time widening the pixel clock range we look for, up to
 235          * +/- ~15MHz.
 236          */
 237
 238         for (i = 0; i < 25; ++i) {
 239                 bool ok;
 240
 241                 memset(ctx, 0, sizeof(*ctx));
 242                 if (pck > 1000 * i * i * i)
 243                         ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
 244                 else
 245                         ctx->pck_min = 0;
 246                 ctx->pck_max = pck + 1000 * i * i * i;
 247
 248                 ok = dss_div_calc(pck, ctx->pck_min, dpi_calc_dss_cb, ctx);
 249                 if (ok)
 250                         return ok;
 251         }
 252
 253         return false;
 254 }
 255
 256
 257
 258 static int dpi_set_dsi_clk(struct dpi_data *dpi, enum omap_channel channel,
 259                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 260                 int *pck_div)
 261 {
 262         struct dpi_clk_calc_ctx ctx;
 263         int r;
 264         bool ok;
 265
 266         ok = dpi_dsi_clk_calc(dpi, pck_req, &ctx);
 267         if (!ok)
 268                 return -EINVAL;
 269
 270         r = dsi_pll_set_clock_div(dpi->dsidev, &ctx.dsi_cinfo);
 271         if (r)
 272                 return r;
 273
 274         dss_select_lcd_clk_source(channel,
 275                         dpi_get_alt_clk_src(channel));
 276
 277         dpi->mgr_config.clock_info = ctx.dispc_cinfo;
 278
 279         *fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 280         *lck_div = ctx.dispc_cinfo.lck_div;
 281         *pck_div = ctx.dispc_cinfo.pck_div;
 282
 283         return 0;
 284 }
 285
 286 static int dpi_set_dispc_clk(struct dpi_data *dpi, unsigned long pck_req,
 287                 unsigned long *fck, int *lck_div, int *pck_div)
 288 {
 289         struct dpi_clk_calc_ctx ctx;
 290         int r;
 291         bool ok;
 292
 293         ok = dpi_dss_clk_calc(pck_req, &ctx);
 294         if (!ok)
 295                 return -EINVAL;
 296
 297         r = dss_set_fck_rate(ctx.fck);
 298         if (r)
 299                 return r;
 300
 301         dpi->mgr_config.clock_info = ctx.dispc_cinfo;
 302
 303         *fck = ctx.fck;
 304         *lck_div = ctx.dispc_cinfo.lck_div;
 305         *pck_div = ctx.dispc_cinfo.pck_div;
 306
 307         return 0;
 308 }
 309
 310 static int dpi_set_mode(struct dpi_data *dpi)
 311 {
 312         struct omap_dss_device *out = &dpi->output;
 313         struct omap_overlay_manager *mgr = out->manager;
 314         struct omap_video_timings *t = &dpi->timings;
 315         int lck_div = 0, pck_div = 0;
 316         unsigned long fck = 0;
 317         unsigned long pck;
 318         int r = 0;
 319
 320         if (dpi->dsidev)
 321                 r = dpi_set_dsi_clk(dpi, mgr->id, t->pixelclock, &fck,
 322                                 &lck_div, &pck_div);
 323         else
 324                 r = dpi_set_dispc_clk(dpi, t->pixelclock, &fck,
 325                                 &lck_div, &pck_div);
 326         if (r)
 327                 return r;
 328
 329         pck = fck / lck_div / pck_div;
 330
 331         if (pck != t->pixelclock) {
 332                 DSSWARN("Could not find exact pixel clock. Requested %d Hz, got %lu Hz\n",
 333                         t->pixelclock, pck);
 334
 335                 t->pixelclock = pck;
 336         }
 337
 338         dss_mgr_set_timings(mgr, t);
 339
 340         return 0;
 341 }
 342
 343 static void dpi_config_lcd_manager(struct dpi_data *dpi)
 344 {
 345         struct omap_dss_device *out = &dpi->output;
 346         struct omap_overlay_manager *mgr = out->manager;
 347
 348         dpi->mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 349
 350         dpi->mgr_config.stallmode = false;
 351         dpi->mgr_config.fifohandcheck = false;
 352
 353         dpi->mgr_config.video_port_width = dpi->data_lines;
 354
 355         dpi->mgr_config.lcden_sig_polarity = 0;
 356
 357         dss_mgr_set_lcd_config(mgr, &dpi->mgr_config);
 358 }
 359
 360 static int dpi_display_enable(struct omap_dss_device *dssdev)
 361 {
 362         struct dpi_data *dpi = &dpi_data;
 363         struct omap_dss_device *out = &dpi->output;
 364         int r;
 365
 366         mutex_lock(&dpi->lock);
 367
 368         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi->vdds_dsi_reg) {
 369                 DSSERR("no VDSS_DSI regulator\n");
 370                 r = -ENODEV;
 371                 goto err_no_reg;
 372         }
 373
 374         if (out == NULL || out->manager == NULL) {
 375                 DSSERR("failed to enable display: no output/manager\n");
 376                 r = -ENODEV;
 377                 goto err_no_out_mgr;
 378         }
 379
 380         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 381                 r = regulator_enable(dpi->vdds_dsi_reg);
 382                 if (r)
 383                         goto err_reg_enable;
 384         }
 385
 386         r = dispc_runtime_get();
 387         if (r)
 388                 goto err_get_dispc;
 389
 390         r = dss_dpi_select_source(out->manager->id);
 391         if (r)
 392                 goto err_src_sel;
 393
 394         if (dpi->dsidev) {
 395                 r = dsi_runtime_get(dpi->dsidev);
 396                 if (r)
 397                         goto err_get_dsi;
 398
 399                 r = dsi_pll_init(dpi->dsidev, 0, 1);
 400                 if (r)
 401                         goto err_dsi_pll_init;
 402         }
 403
 404         r = dpi_set_mode(dpi);
 405         if (r)
 406                 goto err_set_mode;
 407
 408         dpi_config_lcd_manager(dpi);
 409
 410         mdelay(2);
 411
 412         r = dss_mgr_enable(out->manager);
 413         if (r)
 414                 goto err_mgr_enable;
 415
 416         mutex_unlock(&dpi->lock);
 417
 418         return 0;
 419
 420 err_mgr_enable:
 421 err_set_mode:
 422         if (dpi->dsidev)
 423                 dsi_pll_uninit(dpi->dsidev, true);
 424 err_dsi_pll_init:
 425         if (dpi->dsidev)
 426                 dsi_runtime_put(dpi->dsidev);
 427 err_get_dsi:
 428 err_src_sel:
 429         dispc_runtime_put();
 430 err_get_dispc:
 431         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 432                 regulator_disable(dpi->vdds_dsi_reg);
 433 err_reg_enable:
 434 err_no_out_mgr:
 435 err_no_reg:
 436         mutex_unlock(&dpi->lock);
 437         return r;
 438 }
 439
 440 static void dpi_display_disable(struct omap_dss_device *dssdev)
 441 {
 442         struct dpi_data *dpi = &dpi_data;
 443         struct omap_overlay_manager *mgr = dpi->output.manager;
 444
 445         mutex_lock(&dpi->lock);
 446
 447         dss_mgr_disable(mgr);
 448
 449         if (dpi->dsidev) {
 450                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 451                 dsi_pll_uninit(dpi->dsidev, true);
 452                 dsi_runtime_put(dpi->dsidev);
 453         }
 454
 455         dispc_runtime_put();
 456
 457         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 458                 regulator_disable(dpi->vdds_dsi_reg);
 459
 460         mutex_unlock(&dpi->lock);
 461 }
 462
 463 static void dpi_set_timings(struct omap_dss_device *dssdev,
 464                 struct omap_video_timings *timings)
 465 {
 466         struct dpi_data *dpi = &dpi_data;
 467
 468         DSSDBG("dpi_set_timings\n");
 469
 470         mutex_lock(&dpi->lock);
 471
 472         dpi->timings = *timings;
 473
 474         mutex_unlock(&dpi->lock);
 475 }
 476
 477 static void dpi_get_timings(struct omap_dss_device *dssdev,
 478                 struct omap_video_timings *timings)
 479 {
 480         struct dpi_data *dpi = &dpi_data;
 481
 482         mutex_lock(&dpi->lock);
 483
 484         *timings = dpi->timings;
 485
 486         mutex_unlock(&dpi->lock);
 487 }
 488
 489 static int dpi_check_timings(struct omap_dss_device *dssdev,
 490                         struct omap_video_timings *timings)
 491 {
 492         struct dpi_data *dpi = &dpi_data;
 493         struct omap_overlay_manager *mgr = dpi->output.manager;
 494         int lck_div, pck_div;
 495         unsigned long fck;
 496         unsigned long pck;
 497         struct dpi_clk_calc_ctx ctx;
 498         bool ok;
 499
 500         if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
 501                 return -EINVAL;
 502
 503         if (timings->pixelclock == 0)
 504                 return -EINVAL;
 505
 506         if (dpi->dsidev) {
 507                 ok = dpi_dsi_clk_calc(dpi, timings->pixelclock, &ctx);
 508                 if (!ok)
 509                         return -EINVAL;
 510
 511                 fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 512         } else {
 513                 ok = dpi_dss_clk_calc(timings->pixelclock, &ctx);
 514                 if (!ok)
 515                         return -EINVAL;
 516
 517                 fck = ctx.fck;
 518         }
 519
 520         lck_div = ctx.dispc_cinfo.lck_div;
 521         pck_div = ctx.dispc_cinfo.pck_div;
 522
 523         pck = fck / lck_div / pck_div;
 524
 525         timings->pixelclock = pck;
 526
 527         return 0;
 528 }
 529
 530 static void dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 531 {
 532         struct dpi_data *dpi = &dpi_data;
 533
 534         mutex_lock(&dpi->lock);
 535
 536         dpi->data_lines = data_lines;
 537
 538         mutex_unlock(&dpi->lock);
 539 }
 540
 541 static int dpi_verify_dsi_pll(struct platform_device *dsidev)
 542 {
 543         int r;
 544
 545         /* do initial setup with the PLL to see if it is operational */
 546
 547         r = dsi_runtime_get(dsidev);
 548         if (r)
 549                 return r;
 550
 551         r = dsi_pll_init(dsidev, 0, 1);
 552         if (r) {
 553                 dsi_runtime_put(dsidev);
 554                 return r;
 555         }
 556
 557         dsi_pll_uninit(dsidev, true);
 558         dsi_runtime_put(dsidev);
 559
 560         return 0;
 561 }
 562
 563 static int dpi_init_regulator(struct dpi_data *dpi)
 564 {
 565         struct regulator *vdds_dsi;
 566
 567         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 568                 return 0;
 569
 570         if (dpi->vdds_dsi_reg)
 571                 return 0;
 572
 573         vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
 574         if (IS_ERR(vdds_dsi)) {
 575                 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
 576                         DSSERR("can't get VDDS_DSI regulator\n");
 577                 return PTR_ERR(vdds_dsi);
 578         }
 579
 580         dpi->vdds_dsi_reg = vdds_dsi;
 581
 582         return 0;
 583 }
 584
 585 static void dpi_init_pll(struct dpi_data *dpi)
 586 {
 587         struct platform_device *dsidev;
 588
 589         if (dpi->dsidev)
 590                 return;
 591
 592         dsidev = dpi_get_dsidev(dpi->output.dispc_channel);
 593         if (!dsidev)
 594                 return;
 595
 596         if (dpi_verify_dsi_pll(dsidev)) {
 597                 DSSWARN("DSI PLL not operational\n");
 598                 return;
 599         }
 600
 601         dpi->dsidev = dsidev;
 602 }
 603
 604 /*
 605  * Return a hardcoded channel for the DPI output. This should work for
 606  * current use cases, but this can be later expanded to either resolve
 607  * the channel in some more dynamic manner, or get the channel as a user
 608  * parameter.
 609  */
 610 static enum omap_channel dpi_get_channel(void)
 611 {
 612         switch (omapdss_get_version()) {
 613         case OMAPDSS_VER_OMAP24xx:
 614         case OMAPDSS_VER_OMAP34xx_ES1:
 615         case OMAPDSS_VER_OMAP34xx_ES3:
 616         case OMAPDSS_VER_OMAP3630:
 617         case OMAPDSS_VER_AM35xx:
 618         case OMAPDSS_VER_AM43xx:
 619                 return OMAP_DSS_CHANNEL_LCD;
 620
 621         case OMAPDSS_VER_OMAP4430_ES1:
 622         case OMAPDSS_VER_OMAP4430_ES2:
 623         case OMAPDSS_VER_OMAP4:
 624                 return OMAP_DSS_CHANNEL_LCD2;
 625
 626         case OMAPDSS_VER_OMAP5:
 627                 return OMAP_DSS_CHANNEL_LCD3;
 628
 629         default:
 630                 DSSWARN("unsupported DSS version\n");
 631                 return OMAP_DSS_CHANNEL_LCD;
 632         }
 633 }
 634
 635 static int dpi_connect(struct omap_dss_device *dssdev,
 636                 struct omap_dss_device *dst)
 637 {
 638         struct dpi_data *dpi = &dpi_data;
 639         struct omap_overlay_manager *mgr;
 640         int r;
 641
 642         r = dpi_init_regulator(dpi);
 643         if (r)
 644                 return r;
 645
 646         dpi_init_pll(dpi);
 647
 648         mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
 649         if (!mgr)
 650                 return -ENODEV;
 651
 652         r = dss_mgr_connect(mgr, dssdev);
 653         if (r)
 654                 return r;
 655
 656         r = omapdss_output_set_device(dssdev, dst);
 657         if (r) {
 658                 DSSERR("failed to connect output to new device: %s\n",
 659                                 dst->name);
 660                 dss_mgr_disconnect(mgr, dssdev);
 661                 return r;
 662         }
 663
 664         return 0;
 665 }
 666
 667 static void dpi_disconnect(struct omap_dss_device *dssdev,
 668                 struct omap_dss_device *dst)
 669 {
 670         WARN_ON(dst != dssdev->dst);
 671
 672         if (dst != dssdev->dst)
 673                 return;
 674
 675         omapdss_output_unset_device(dssdev);
 676
 677         if (dssdev->manager)
 678                 dss_mgr_disconnect(dssdev->manager, dssdev);
 679 }
 680
 681 static const struct omapdss_dpi_ops dpi_ops = {
 682         .connect = dpi_connect,
 683         .disconnect = dpi_disconnect,
 684
 685         .enable = dpi_display_enable,
 686         .disable = dpi_display_disable,
 687
 688         .check_timings = dpi_check_timings,
 689         .set_timings = dpi_set_timings,
 690         .get_timings = dpi_get_timings,
 691
 692         .set_data_lines = dpi_set_data_lines,
 693 };
 694
 695 static void dpi_init_output(struct platform_device *pdev)
 696 {
 697         struct dpi_data *dpi = &dpi_data;
 698         struct omap_dss_device *out = &dpi->output;
 699
 700         out->dev = &pdev->dev;
 701         out->id = OMAP_DSS_OUTPUT_DPI;
 702         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 703         out->name = "dpi.0";
 704         out->dispc_channel = dpi_get_channel();
 705         out->ops.dpi = &dpi_ops;
 706         out->owner = THIS_MODULE;
 707
 708         omapdss_register_output(out);
 709 }
 710
 711 static void __exit dpi_uninit_output(struct platform_device *pdev)
 712 {
 713         struct dpi_data *dpi = &dpi_data;
 714         struct omap_dss_device *out = &dpi->output;
 715
 716         omapdss_unregister_output(out);
 717 }
 718
 719 static int omap_dpi_probe(struct platform_device *pdev)
 720 {
 721         struct dpi_data *dpi = &dpi_data;
 722
 723         dpi->pdev = pdev;
 724
 725         dev_set_drvdata(&pdev->dev, dpi);
 726
 727         mutex_init(&dpi->lock);
 728
 729         dpi_init_output(pdev);
 730
 731         return 0;
 732 }
 733
 734 static int __exit omap_dpi_remove(struct platform_device *pdev)
 735 {
 736         dpi_uninit_output(pdev);
 737
 738         return 0;
 739 }
 740
 741 static struct platform_driver omap_dpi_driver = {
 742         .probe          = omap_dpi_probe,
 743         .remove         = __exit_p(omap_dpi_remove),
 744         .driver         = {
 745                 .name   = "omapdss_dpi",
 746                 .owner  = THIS_MODULE,
 747                 .suppress_bind_attrs = true,
 748         },
 749 };
 750
 751 int __init dpi_init_platform_driver(void)
 752 {
 753         return platform_driver_register(&omap_dpi_driver);
 754 }
 755
 756 void __exit dpi_uninit_platform_driver(void)
 757 {
 758         platform_driver_unregister(&omap_dpi_driver);
 759 }
 760
 761 int __init dpi_init_port(struct platform_device *pdev, struct device_node *port)
 762 {
 763         struct dpi_data *dpi = &dpi_data;
 764         struct device_node *ep;
 765         u32 datalines;
 766         int r;
 767
 768         ep = omapdss_of_get_next_endpoint(port, NULL);
 769         if (!ep)
 770                 return 0;
 771
 772         r = of_property_read_u32(ep, "data-lines", &datalines);
 773         if (r) {
 774                 DSSERR("failed to parse datalines\n");
 775                 goto err_datalines;
 776         }
 777
 778         dpi->data_lines = datalines;
 779
 780         of_node_put(ep);
 781
 782         dpi->pdev = pdev;
 783
 784         mutex_init(&dpi->lock);
 785
 786         dpi_init_output(pdev);
 787
 788         dpi->port_initialized = true;
 789
 790         return 0;
 791
 792 err_datalines:
 793         of_node_put(ep);
 794
 795         return r;
 796 }
 797
 798 void __exit dpi_uninit_port(void)
 799 {
 800         struct dpi_data *dpi = &dpi_data;
 801
 802         if (!dpi->port_initialized)
 803                 return;
 804
 805         dpi_uninit_output(dpi->pdev);
 806 }