Pileus Git - ~andy/linux/blob - 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         struct dss_clock_info dss_cinfo;
 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(int fckd, unsigned long fck, void *data)
 188 {
 189         struct dpi_clk_calc_ctx *ctx = data;
 190
 191         ctx->dss_cinfo.fck = fck;
 192         ctx->dss_cinfo.fck_div = fckd;
 193
 194         return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 195                         dpi_calc_dispc_cb, ctx);
 196 }
 197
 198 static bool dpi_dsi_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 199 {
 200         unsigned long clkin;
 201         unsigned long pll_min, pll_max;
 202
 203         clkin = dsi_get_pll_clkin(dpi.dsidev);
 204
 205         memset(ctx, 0, sizeof(*ctx));
 206         ctx->dsidev = dpi.dsidev;
 207         ctx->pck_min = pck - 1000;
 208         ctx->pck_max = pck + 1000;
 209         ctx->dsi_cinfo.clkin = clkin;
 210
 211         pll_min = 0;
 212         pll_max = 0;
 213
 214         return dsi_pll_calc(dpi.dsidev, clkin,
 215                         pll_min, pll_max,
 216                         dpi_calc_pll_cb, ctx);
 217 }
 218
 219 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 220 {
 221         int i;
 222
 223         /*
 224          * DSS fck gives us very few possibilities, so finding a good pixel
 225          * clock may not be possible. We try multiple times to find the clock,
 226          * each time widening the pixel clock range we look for, up to
 227          * +/- ~15MHz.
 228          */
 229
 230         for (i = 0; i < 25; ++i) {
 231                 bool ok;
 232
 233                 memset(ctx, 0, sizeof(*ctx));
 234                 if (pck > 1000 * i * i * i)
 235                         ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
 236                 else
 237                         ctx->pck_min = 0;
 238                 ctx->pck_max = pck + 1000 * i * i * i;
 239
 240                 ok = dss_div_calc(ctx->pck_min, dpi_calc_dss_cb, ctx);
 241                 if (ok)
 242                         return ok;
 243         }
 244
 245         return false;
 246 }
 247
 248
 249
 250 static int dpi_set_dsi_clk(enum omap_channel channel,
 251                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 252                 int *pck_div)
 253 {
 254         struct dpi_clk_calc_ctx ctx;
 255         int r;
 256         bool ok;
 257
 258         ok = dpi_dsi_clk_calc(pck_req, &ctx);
 259         if (!ok)
 260                 return -EINVAL;
 261
 262         r = dsi_pll_set_clock_div(dpi.dsidev, &ctx.dsi_cinfo);
 263         if (r)
 264                 return r;
 265
 266         dss_select_lcd_clk_source(channel,
 267                         dpi_get_alt_clk_src(channel));
 268
 269         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 270
 271         *fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 272         *lck_div = ctx.dispc_cinfo.lck_div;
 273         *pck_div = ctx.dispc_cinfo.pck_div;
 274
 275         return 0;
 276 }
 277
 278 static int dpi_set_dispc_clk(unsigned long pck_req, unsigned long *fck,
 279                 int *lck_div, int *pck_div)
 280 {
 281         struct dpi_clk_calc_ctx ctx;
 282         int r;
 283         bool ok;
 284
 285         ok = dpi_dss_clk_calc(pck_req, &ctx);
 286         if (!ok)
 287                 return -EINVAL;
 288
 289         r = dss_set_clock_div(&ctx.dss_cinfo);
 290         if (r)
 291                 return r;
 292
 293         dpi.mgr_config.clock_info = ctx.dispc_cinfo;
 294
 295         *fck = ctx.dss_cinfo.fck;
 296         *lck_div = ctx.dispc_cinfo.lck_div;
 297         *pck_div = ctx.dispc_cinfo.pck_div;
 298
 299         return 0;
 300 }
 301
 302 static int dpi_set_mode(struct omap_overlay_manager *mgr)
 303 {
 304         struct omap_video_timings *t = &dpi.timings;
 305         int lck_div = 0, pck_div = 0;
 306         unsigned long fck = 0;
 307         unsigned long pck;
 308         int r = 0;
 309
 310         if (dpi.dsidev)
 311                 r = dpi_set_dsi_clk(mgr->id, t->pixel_clock * 1000, &fck,
 312                                 &lck_div, &pck_div);
 313         else
 314                 r = dpi_set_dispc_clk(t->pixel_clock * 1000, &fck,
 315                                 &lck_div, &pck_div);
 316         if (r)
 317                 return r;
 318
 319         pck = fck / lck_div / pck_div / 1000;
 320
 321         if (pck != t->pixel_clock) {
 322                 DSSWARN("Could not find exact pixel clock. "
 323                                 "Requested %d kHz, got %lu kHz\n",
 324                                 t->pixel_clock, pck);
 325
 326                 t->pixel_clock = pck;
 327         }
 328
 329         dss_mgr_set_timings(mgr, t);
 330
 331         return 0;
 332 }
 333
 334 static void dpi_config_lcd_manager(struct omap_overlay_manager *mgr)
 335 {
 336         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 337
 338         dpi.mgr_config.stallmode = false;
 339         dpi.mgr_config.fifohandcheck = false;
 340
 341         dpi.mgr_config.video_port_width = dpi.data_lines;
 342
 343         dpi.mgr_config.lcden_sig_polarity = 0;
 344
 345         dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
 346 }
 347
 348 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 349 {
 350         struct omap_dss_device *out = &dpi.output;
 351         int r;
 352
 353         mutex_lock(&dpi.lock);
 354
 355         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
 356                 DSSERR("no VDSS_DSI regulator\n");
 357                 r = -ENODEV;
 358                 goto err_no_reg;
 359         }
 360
 361         if (out == NULL || out->manager == NULL) {
 362                 DSSERR("failed to enable display: no output/manager\n");
 363                 r = -ENODEV;
 364                 goto err_no_out_mgr;
 365         }
 366
 367         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 368                 r = regulator_enable(dpi.vdds_dsi_reg);
 369                 if (r)
 370                         goto err_reg_enable;
 371         }
 372
 373         r = dispc_runtime_get();
 374         if (r)
 375                 goto err_get_dispc;
 376
 377         r = dss_dpi_select_source(out->manager->id);
 378         if (r)
 379                 goto err_src_sel;
 380
 381         if (dpi.dsidev) {
 382                 r = dsi_runtime_get(dpi.dsidev);
 383                 if (r)
 384                         goto err_get_dsi;
 385
 386                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 387                 if (r)
 388                         goto err_dsi_pll_init;
 389         }
 390
 391         r = dpi_set_mode(out->manager);
 392         if (r)
 393                 goto err_set_mode;
 394
 395         dpi_config_lcd_manager(out->manager);
 396
 397         mdelay(2);
 398
 399         r = dss_mgr_enable(out->manager);
 400         if (r)
 401                 goto err_mgr_enable;
 402
 403         mutex_unlock(&dpi.lock);
 404
 405         return 0;
 406
 407 err_mgr_enable:
 408 err_set_mode:
 409         if (dpi.dsidev)
 410                 dsi_pll_uninit(dpi.dsidev, true);
 411 err_dsi_pll_init:
 412         if (dpi.dsidev)
 413                 dsi_runtime_put(dpi.dsidev);
 414 err_get_dsi:
 415 err_src_sel:
 416         dispc_runtime_put();
 417 err_get_dispc:
 418         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 419                 regulator_disable(dpi.vdds_dsi_reg);
 420 err_reg_enable:
 421 err_no_out_mgr:
 422 err_no_reg:
 423         mutex_unlock(&dpi.lock);
 424         return r;
 425 }
 426 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 427
 428 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 429 {
 430         struct omap_overlay_manager *mgr = dpi.output.manager;
 431
 432         mutex_lock(&dpi.lock);
 433
 434         dss_mgr_disable(mgr);
 435
 436         if (dpi.dsidev) {
 437                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 438                 dsi_pll_uninit(dpi.dsidev, true);
 439                 dsi_runtime_put(dpi.dsidev);
 440         }
 441
 442         dispc_runtime_put();
 443
 444         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 445                 regulator_disable(dpi.vdds_dsi_reg);
 446
 447         mutex_unlock(&dpi.lock);
 448 }
 449 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 450
 451 void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
 452                 struct omap_video_timings *timings)
 453 {
 454         DSSDBG("dpi_set_timings\n");
 455
 456         mutex_lock(&dpi.lock);
 457
 458         dpi.timings = *timings;
 459
 460         mutex_unlock(&dpi.lock);
 461 }
 462 EXPORT_SYMBOL(omapdss_dpi_set_timings);
 463
 464 static void dpi_get_timings(struct omap_dss_device *dssdev,
 465                 struct omap_video_timings *timings)
 466 {
 467         mutex_lock(&dpi.lock);
 468
 469         *timings = dpi.timings;
 470
 471         mutex_unlock(&dpi.lock);
 472 }
 473
 474 int dpi_check_timings(struct omap_dss_device *dssdev,
 475                         struct omap_video_timings *timings)
 476 {
 477         struct omap_overlay_manager *mgr = dpi.output.manager;
 478         int lck_div, pck_div;
 479         unsigned long fck;
 480         unsigned long pck;
 481         struct dpi_clk_calc_ctx ctx;
 482         bool ok;
 483
 484         if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
 485                 return -EINVAL;
 486
 487         if (timings->pixel_clock == 0)
 488                 return -EINVAL;
 489
 490         if (dpi.dsidev) {
 491                 ok = dpi_dsi_clk_calc(timings->pixel_clock * 1000, &ctx);
 492                 if (!ok)
 493                         return -EINVAL;
 494
 495                 fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 496         } else {
 497                 ok = dpi_dss_clk_calc(timings->pixel_clock * 1000, &ctx);
 498                 if (!ok)
 499                         return -EINVAL;
 500
 501                 fck = ctx.dss_cinfo.fck;
 502         }
 503
 504         lck_div = ctx.dispc_cinfo.lck_div;
 505         pck_div = ctx.dispc_cinfo.pck_div;
 506
 507         pck = fck / lck_div / pck_div / 1000;
 508
 509         timings->pixel_clock = pck;
 510
 511         return 0;
 512 }
 513 EXPORT_SYMBOL(dpi_check_timings);
 514
 515 void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 516 {
 517         mutex_lock(&dpi.lock);
 518
 519         dpi.data_lines = data_lines;
 520
 521         mutex_unlock(&dpi.lock);
 522 }
 523 EXPORT_SYMBOL(omapdss_dpi_set_data_lines);
 524
 525 static int dpi_verify_dsi_pll(struct platform_device *dsidev)
 526 {
 527         int r;
 528
 529         /* do initial setup with the PLL to see if it is operational */
 530
 531         r = dsi_runtime_get(dsidev);
 532         if (r)
 533                 return r;
 534
 535         r = dsi_pll_init(dsidev, 0, 1);
 536         if (r) {
 537                 dsi_runtime_put(dsidev);
 538                 return r;
 539         }
 540
 541         dsi_pll_uninit(dsidev, true);
 542         dsi_runtime_put(dsidev);
 543
 544         return 0;
 545 }
 546
 547 static int dpi_init_regulator(void)
 548 {
 549         struct regulator *vdds_dsi;
 550
 551         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 552                 return 0;
 553
 554         if (dpi.vdds_dsi_reg)
 555                 return 0;
 556
 557         vdds_dsi = dss_get_vdds_dsi();
 558
 559         if (IS_ERR(vdds_dsi)) {
 560                 vdds_dsi = devm_regulator_get(&dpi.pdev->dev, "vdds_dsi");
 561                 if (IS_ERR(vdds_dsi)) {
 562                         DSSERR("can't get VDDS_DSI regulator\n");
 563                         return PTR_ERR(vdds_dsi);
 564                 }
 565         }
 566
 567         dpi.vdds_dsi_reg = vdds_dsi;
 568
 569         return 0;
 570 }
 571
 572 static void dpi_init_pll(void)
 573 {
 574         struct platform_device *dsidev;
 575
 576         if (dpi.dsidev)
 577                 return;
 578
 579         dsidev = dpi_get_dsidev(dpi.output.dispc_channel);
 580         if (!dsidev)
 581                 return;
 582
 583         if (dpi_verify_dsi_pll(dsidev)) {
 584                 DSSWARN("DSI PLL not operational\n");
 585                 return;
 586         }
 587
 588         dpi.dsidev = dsidev;
 589 }
 590
 591 /*
 592  * Return a hardcoded channel for the DPI output. This should work for
 593  * current use cases, but this can be later expanded to either resolve
 594  * the channel in some more dynamic manner, or get the channel as a user
 595  * parameter.
 596  */
 597 static enum omap_channel dpi_get_channel(void)
 598 {
 599         switch (omapdss_get_version()) {
 600         case OMAPDSS_VER_OMAP24xx:
 601         case OMAPDSS_VER_OMAP34xx_ES1:
 602         case OMAPDSS_VER_OMAP34xx_ES3:
 603         case OMAPDSS_VER_OMAP3630:
 604         case OMAPDSS_VER_AM35xx:
 605                 return OMAP_DSS_CHANNEL_LCD;
 606
 607         case OMAPDSS_VER_OMAP4430_ES1:
 608         case OMAPDSS_VER_OMAP4430_ES2:
 609         case OMAPDSS_VER_OMAP4:
 610                 return OMAP_DSS_CHANNEL_LCD2;
 611
 612         case OMAPDSS_VER_OMAP5:
 613                 return OMAP_DSS_CHANNEL_LCD3;
 614
 615         default:
 616                 DSSWARN("unsupported DSS version\n");
 617                 return OMAP_DSS_CHANNEL_LCD;
 618         }
 619 }
 620
 621 static struct omap_dss_device *dpi_find_dssdev(struct platform_device *pdev)
 622 {
 623         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 624         const char *def_disp_name = omapdss_get_default_display_name();
 625         struct omap_dss_device *def_dssdev;
 626         int i;
 627
 628         def_dssdev = NULL;
 629
 630         for (i = 0; i < pdata->num_devices; ++i) {
 631                 struct omap_dss_device *dssdev = pdata->devices[i];
 632
 633                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 634                         continue;
 635
 636                 if (def_dssdev == NULL)
 637                         def_dssdev = dssdev;
 638
 639                 if (def_disp_name != NULL &&
 640                                 strcmp(dssdev->name, def_disp_name) == 0) {
 641                         def_dssdev = dssdev;
 642                         break;
 643                 }
 644         }
 645
 646         return def_dssdev;
 647 }
 648
 649 static int dpi_probe_pdata(struct platform_device *dpidev)
 650 {
 651         struct omap_dss_device *plat_dssdev;
 652         struct omap_dss_device *dssdev;
 653         int r;
 654
 655         plat_dssdev = dpi_find_dssdev(dpidev);
 656
 657         if (!plat_dssdev)
 658                 return 0;
 659
 660         r = dpi_init_regulator();
 661         if (r)
 662                 return r;
 663
 664         dpi_init_pll();
 665
 666         dssdev = dss_alloc_and_init_device(&dpidev->dev);
 667         if (!dssdev)
 668                 return -ENOMEM;
 669
 670         dss_copy_device_pdata(dssdev, plat_dssdev);
 671
 672         r = omapdss_output_set_device(&dpi.output, dssdev);
 673         if (r) {
 674                 DSSERR("failed to connect output to new device: %s\n",
 675                                 dssdev->name);
 676                 dss_put_device(dssdev);
 677                 return r;
 678         }
 679
 680         r = dss_add_device(dssdev);
 681         if (r) {
 682                 DSSERR("device %s register failed: %d\n", dssdev->name, r);
 683                 omapdss_output_unset_device(&dpi.output);
 684                 dss_put_device(dssdev);
 685                 return r;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static int dpi_connect(struct omap_dss_device *dssdev,
 692                 struct omap_dss_device *dst)
 693 {
 694         struct omap_overlay_manager *mgr;
 695         int r;
 696
 697         r = dpi_init_regulator();
 698         if (r)
 699                 return r;
 700
 701         dpi_init_pll();
 702
 703         mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
 704         if (!mgr)
 705                 return -ENODEV;
 706
 707         r = dss_mgr_connect(mgr, dssdev);
 708         if (r)
 709                 return r;
 710
 711         r = omapdss_output_set_device(dssdev, dst);
 712         if (r) {
 713                 DSSERR("failed to connect output to new device: %s\n",
 714                                 dst->name);
 715                 dss_mgr_disconnect(mgr, dssdev);
 716                 return r;
 717         }
 718
 719         return 0;
 720 }
 721
 722 static void dpi_disconnect(struct omap_dss_device *dssdev,
 723                 struct omap_dss_device *dst)
 724 {
 725         WARN_ON(dst != dssdev->device);
 726
 727         if (dst != dssdev->device)
 728                 return;
 729
 730         omapdss_output_unset_device(dssdev);
 731
 732         if (dssdev->manager)
 733                 dss_mgr_disconnect(dssdev->manager, dssdev);
 734 }
 735
 736 static const struct omapdss_dpi_ops dpi_ops = {
 737         .connect = dpi_connect,
 738         .disconnect = dpi_disconnect,
 739
 740         .enable = omapdss_dpi_display_enable,
 741         .disable = omapdss_dpi_display_disable,
 742
 743         .check_timings = dpi_check_timings,
 744         .set_timings = omapdss_dpi_set_timings,
 745         .get_timings = dpi_get_timings,
 746
 747         .set_data_lines = omapdss_dpi_set_data_lines,
 748 };
 749
 750 static void dpi_init_output(struct platform_device *pdev)
 751 {
 752         struct omap_dss_device *out = &dpi.output;
 753
 754         out->dev = &pdev->dev;
 755         out->id = OMAP_DSS_OUTPUT_DPI;
 756         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 757         out->name = "dpi.0";
 758         out->dispc_channel = dpi_get_channel();
 759         out->ops.dpi = &dpi_ops;
 760         out->owner = THIS_MODULE;
 761
 762         omapdss_register_output(out);
 763 }
 764
 765 static void __exit dpi_uninit_output(struct platform_device *pdev)
 766 {
 767         struct omap_dss_device *out = &dpi.output;
 768
 769         omapdss_unregister_output(out);
 770 }
 771
 772 static int omap_dpi_probe(struct platform_device *pdev)
 773 {
 774         int r;
 775
 776         dpi.pdev = pdev;
 777
 778         mutex_init(&dpi.lock);
 779
 780         dpi_init_output(pdev);
 781
 782         if (pdev->dev.platform_data) {
 783                 r = dpi_probe_pdata(pdev);
 784                 if (r)
 785                         goto err_probe;
 786         }
 787
 788         return 0;
 789
 790 err_probe:
 791         dpi_uninit_output(pdev);
 792         return r;
 793 }
 794
 795 static int __exit omap_dpi_remove(struct platform_device *pdev)
 796 {
 797         dss_unregister_child_devices(&pdev->dev);
 798
 799         dpi_uninit_output(pdev);
 800
 801         return 0;
 802 }
 803
 804 static struct platform_driver omap_dpi_driver = {
 805         .probe          = omap_dpi_probe,
 806         .remove         = __exit_p(omap_dpi_remove),
 807         .driver         = {
 808                 .name   = "omapdss_dpi",
 809                 .owner  = THIS_MODULE,
 810         },
 811 };
 812
 813 int __init dpi_init_platform_driver(void)
 814 {
 815         return platform_driver_register(&omap_dpi_driver);
 816 }
 817
 818 void __exit dpi_uninit_platform_driver(void)
 819 {
 820         platform_driver_unregister(&omap_dpi_driver);
 821 }