drivers/video/fbdev/omap2/omapfb/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 #include <linux/clk.h>
  35 #include <linux/component.h>
  36
  37 #include <video/omapdss.h>
  38
  39 #include "dss.h"
  40 #include "dss_features.h"
  41
  42 #define HSDIV_DISPC     0
  43
  44 struct dpi_data {
  45         struct platform_device *pdev;
  46
  47         struct regulator *vdds_dsi_reg;
  48         struct dss_pll *pll;
  49
  50         struct mutex lock;
  51
  52         struct omap_video_timings timings;
  53         struct dss_lcd_mgr_config mgr_config;
  54         int data_lines;
  55
  56         struct omap_dss_device output;
  57
  58         bool port_initialized;
  59 };
  60
  61 static struct dpi_data *dpi_get_data_from_dssdev(struct omap_dss_device *dssdev)
  62 {
  63         return container_of(dssdev, struct dpi_data, output);
  64 }
  65
  66 /* only used in non-DT mode */
  67 static struct dpi_data *dpi_get_data_from_pdev(struct platform_device *pdev)
  68 {
  69         return dev_get_drvdata(&pdev->dev);
  70 }
  71
  72 static struct dss_pll *dpi_get_pll(enum omap_channel channel)
  73 {
  74         /*
  75          * XXX we can't currently use DSI PLL for DPI with OMAP3, as the DSI PLL
  76          * would also be used for DISPC fclk. Meaning, when the DPI output is
  77          * disabled, DISPC clock will be disabled, and TV out will stop.
  78          */
  79         switch (omapdss_get_version()) {
  80         case OMAPDSS_VER_OMAP24xx:
  81         case OMAPDSS_VER_OMAP34xx_ES1:
  82         case OMAPDSS_VER_OMAP34xx_ES3:
  83         case OMAPDSS_VER_OMAP3630:
  84         case OMAPDSS_VER_AM35xx:
  85         case OMAPDSS_VER_AM43xx:
  86                 return NULL;
  87
  88         case OMAPDSS_VER_OMAP4430_ES1:
  89         case OMAPDSS_VER_OMAP4430_ES2:
  90         case OMAPDSS_VER_OMAP4:
  91                 switch (channel) {
  92                 case OMAP_DSS_CHANNEL_LCD:
  93                         return dss_pll_find("dsi0");
  94                 case OMAP_DSS_CHANNEL_LCD2:
  95                         return dss_pll_find("dsi1");
  96                 default:
  97                         return NULL;
  98                 }
  99
 100         case OMAPDSS_VER_OMAP5:
 101                 switch (channel) {
 102                 case OMAP_DSS_CHANNEL_LCD:
 103                         return dss_pll_find("dsi0");
 104                 case OMAP_DSS_CHANNEL_LCD3:
 105                         return dss_pll_find("dsi1");
 106                 default:
 107                         return NULL;
 108                 }
 109
 110         case OMAPDSS_VER_DRA7xx:
 111                 switch (channel) {
 112                 case OMAP_DSS_CHANNEL_LCD:
 113                 case OMAP_DSS_CHANNEL_LCD2:
 114                         return dss_pll_find("video0");
 115                 case OMAP_DSS_CHANNEL_LCD3:
 116                         return dss_pll_find("video1");
 117                 default:
 118                         return NULL;
 119                 }
 120
 121         default:
 122                 return NULL;
 123         }
 124 }
 125
 126 static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel)
 127 {
 128         switch (channel) {
 129         case OMAP_DSS_CHANNEL_LCD:
 130                 return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
 131         case OMAP_DSS_CHANNEL_LCD2:
 132                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
 133         case OMAP_DSS_CHANNEL_LCD3:
 134                 return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
 135         default:
 136                 /* this shouldn't happen */
 137                 WARN_ON(1);
 138                 return OMAP_DSS_CLK_SRC_FCK;
 139         }
 140 }
 141
 142 struct dpi_clk_calc_ctx {
 143         struct dss_pll *pll;
 144
 145         /* inputs */
 146
 147         unsigned long pck_min, pck_max;
 148
 149         /* outputs */
 150
 151         struct dss_pll_clock_info dsi_cinfo;
 152         unsigned long fck;
 153         struct dispc_clock_info dispc_cinfo;
 154 };
 155
 156 static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
 157                 unsigned long pck, void *data)
 158 {
 159         struct dpi_clk_calc_ctx *ctx = data;
 160
 161         /*
 162          * Odd dividers give us uneven duty cycle, causing problem when level
 163          * shifted. So skip all odd dividers when the pixel clock is on the
 164          * higher side.
 165          */
 166         if (ctx->pck_min >= 100000000) {
 167                 if (lckd > 1 && lckd % 2 != 0)
 168                         return false;
 169
 170                 if (pckd > 1 && pckd % 2 != 0)
 171                         return false;
 172         }
 173
 174         ctx->dispc_cinfo.lck_div = lckd;
 175         ctx->dispc_cinfo.pck_div = pckd;
 176         ctx->dispc_cinfo.lck = lck;
 177         ctx->dispc_cinfo.pck = pck;
 178
 179         return true;
 180 }
 181
 182
 183 static bool dpi_calc_hsdiv_cb(int m_dispc, unsigned long dispc,
 184                 void *data)
 185 {
 186         struct dpi_clk_calc_ctx *ctx = data;
 187
 188         /*
 189          * Odd dividers give us uneven duty cycle, causing problem when level
 190          * shifted. So skip all odd dividers when the pixel clock is on the
 191          * higher side.
 192          */
 193         if (m_dispc > 1 && m_dispc % 2 != 0 && ctx->pck_min >= 100000000)
 194                 return false;
 195
 196         ctx->dsi_cinfo.mX[HSDIV_DISPC] = m_dispc;
 197         ctx->dsi_cinfo.clkout[HSDIV_DISPC] = dispc;
 198
 199         return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
 200                         dpi_calc_dispc_cb, ctx);
 201 }
 202
 203
 204 static bool dpi_calc_pll_cb(int n, int m, unsigned long fint,
 205                 unsigned long clkdco,
 206                 void *data)
 207 {
 208         struct dpi_clk_calc_ctx *ctx = data;
 209
 210         ctx->dsi_cinfo.n = n;
 211         ctx->dsi_cinfo.m = m;
 212         ctx->dsi_cinfo.fint = fint;
 213         ctx->dsi_cinfo.clkdco = clkdco;
 214
 215         return dss_pll_hsdiv_calc(ctx->pll, clkdco,
 216                 ctx->pck_min, dss_feat_get_param_max(FEAT_PARAM_DSS_FCK),
 217                 dpi_calc_hsdiv_cb, ctx);
 218 }
 219
 220 static bool dpi_calc_dss_cb(unsigned long fck, void *data)
 221 {
 222         struct dpi_clk_calc_ctx *ctx = data;
 223
 224         ctx->fck = fck;
 225
 226         return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 227                         dpi_calc_dispc_cb, ctx);
 228 }
 229
 230 static bool dpi_dsi_clk_calc(struct dpi_data *dpi, unsigned long pck,
 231                 struct dpi_clk_calc_ctx *ctx)
 232 {
 233         unsigned long clkin;
 234         unsigned long pll_min, pll_max;
 235
 236         memset(ctx, 0, sizeof(*ctx));
 237         ctx->pll = dpi->pll;
 238         ctx->pck_min = pck - 1000;
 239         ctx->pck_max = pck + 1000;
 240
 241         pll_min = 0;
 242         pll_max = 0;
 243
 244         clkin = clk_get_rate(ctx->pll->clkin);
 245
 246         return dss_pll_calc(ctx->pll, clkin,
 247                         pll_min, pll_max,
 248                         dpi_calc_pll_cb, ctx);
 249 }
 250
 251 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
 252 {
 253         int i;
 254
 255         /*
 256          * DSS fck gives us very few possibilities, so finding a good pixel
 257          * clock may not be possible. We try multiple times to find the clock,
 258          * each time widening the pixel clock range we look for, up to
 259          * +/- ~15MHz.
 260          */
 261
 262         for (i = 0; i < 25; ++i) {
 263                 bool ok;
 264
 265                 memset(ctx, 0, sizeof(*ctx));
 266                 if (pck > 1000 * i * i * i)
 267                         ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
 268                 else
 269                         ctx->pck_min = 0;
 270                 ctx->pck_max = pck + 1000 * i * i * i;
 271
 272                 ok = dss_div_calc(pck, ctx->pck_min, dpi_calc_dss_cb, ctx);
 273                 if (ok)
 274                         return ok;
 275         }
 276
 277         return false;
 278 }
 279
 280
 281
 282 static int dpi_set_dsi_clk(struct dpi_data *dpi, enum omap_channel channel,
 283                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 284                 int *pck_div)
 285 {
 286         struct dpi_clk_calc_ctx ctx;
 287         int r;
 288         bool ok;
 289
 290         ok = dpi_dsi_clk_calc(dpi, pck_req, &ctx);
 291         if (!ok)
 292                 return -EINVAL;
 293
 294         r = dss_pll_set_config(dpi->pll, &ctx.dsi_cinfo);
 295         if (r)
 296                 return r;
 297
 298         dss_select_lcd_clk_source(channel,
 299                         dpi_get_alt_clk_src(channel));
 300
 301         dpi->mgr_config.clock_info = ctx.dispc_cinfo;
 302
 303         *fck = ctx.dsi_cinfo.clkout[HSDIV_DISPC];
 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_dispc_clk(struct dpi_data *dpi, unsigned long pck_req,
 311                 unsigned long *fck, int *lck_div, int *pck_div)
 312 {
 313         struct dpi_clk_calc_ctx ctx;
 314         int r;
 315         bool ok;
 316
 317         ok = dpi_dss_clk_calc(pck_req, &ctx);
 318         if (!ok)
 319                 return -EINVAL;
 320
 321         r = dss_set_fck_rate(ctx.fck);
 322         if (r)
 323                 return r;
 324
 325         dpi->mgr_config.clock_info = ctx.dispc_cinfo;
 326
 327         *fck = ctx.fck;
 328         *lck_div = ctx.dispc_cinfo.lck_div;
 329         *pck_div = ctx.dispc_cinfo.pck_div;
 330
 331         return 0;
 332 }
 333
 334 static int dpi_set_mode(struct dpi_data *dpi)
 335 {
 336         struct omap_dss_device *out = &dpi->output;
 337         struct omap_overlay_manager *mgr = out->manager;
 338         struct omap_video_timings *t = &dpi->timings;
 339         int lck_div = 0, pck_div = 0;
 340         unsigned long fck = 0;
 341         unsigned long pck;
 342         int r = 0;
 343
 344         if (dpi->pll)
 345                 r = dpi_set_dsi_clk(dpi, mgr->id, t->pixelclock, &fck,
 346                                 &lck_div, &pck_div);
 347         else
 348                 r = dpi_set_dispc_clk(dpi, t->pixelclock, &fck,
 349                                 &lck_div, &pck_div);
 350         if (r)
 351                 return r;
 352
 353         pck = fck / lck_div / pck_div;
 354
 355         if (pck != t->pixelclock) {
 356                 DSSWARN("Could not find exact pixel clock. Requested %d Hz, got %lu Hz\n",
 357                         t->pixelclock, pck);
 358
 359                 t->pixelclock = pck;
 360         }
 361
 362         dss_mgr_set_timings(mgr, t);
 363
 364         return 0;
 365 }
 366
 367 static void dpi_config_lcd_manager(struct dpi_data *dpi)
 368 {
 369         struct omap_dss_device *out = &dpi->output;
 370         struct omap_overlay_manager *mgr = out->manager;
 371
 372         dpi->mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 373
 374         dpi->mgr_config.stallmode = false;
 375         dpi->mgr_config.fifohandcheck = false;
 376
 377         dpi->mgr_config.video_port_width = dpi->data_lines;
 378
 379         dpi->mgr_config.lcden_sig_polarity = 0;
 380
 381         dss_mgr_set_lcd_config(mgr, &dpi->mgr_config);
 382 }
 383
 384 static int dpi_display_enable(struct omap_dss_device *dssdev)
 385 {
 386         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 387         struct omap_dss_device *out = &dpi->output;
 388         int r;
 389
 390         mutex_lock(&dpi->lock);
 391
 392         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi->vdds_dsi_reg) {
 393                 DSSERR("no VDSS_DSI regulator\n");
 394                 r = -ENODEV;
 395                 goto err_no_reg;
 396         }
 397
 398         if (out->manager == NULL) {
 399                 DSSERR("failed to enable display: no output/manager\n");
 400                 r = -ENODEV;
 401                 goto err_no_out_mgr;
 402         }
 403
 404         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 405                 r = regulator_enable(dpi->vdds_dsi_reg);
 406                 if (r)
 407                         goto err_reg_enable;
 408         }
 409
 410         r = dispc_runtime_get();
 411         if (r)
 412                 goto err_get_dispc;
 413
 414         r = dss_dpi_select_source(out->port_num, out->manager->id);
 415         if (r)
 416                 goto err_src_sel;
 417
 418         if (dpi->pll) {
 419                 r = dss_pll_enable(dpi->pll);
 420                 if (r)
 421                         goto err_dsi_pll_init;
 422         }
 423
 424         r = dpi_set_mode(dpi);
 425         if (r)
 426                 goto err_set_mode;
 427
 428         dpi_config_lcd_manager(dpi);
 429
 430         mdelay(2);
 431
 432         r = dss_mgr_enable(out->manager);
 433         if (r)
 434                 goto err_mgr_enable;
 435
 436         mutex_unlock(&dpi->lock);
 437
 438         return 0;
 439
 440 err_mgr_enable:
 441 err_set_mode:
 442         if (dpi->pll)
 443                 dss_pll_disable(dpi->pll);
 444 err_dsi_pll_init:
 445 err_src_sel:
 446         dispc_runtime_put();
 447 err_get_dispc:
 448         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 449                 regulator_disable(dpi->vdds_dsi_reg);
 450 err_reg_enable:
 451 err_no_out_mgr:
 452 err_no_reg:
 453         mutex_unlock(&dpi->lock);
 454         return r;
 455 }
 456
 457 static void dpi_display_disable(struct omap_dss_device *dssdev)
 458 {
 459         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 460         struct omap_overlay_manager *mgr = dpi->output.manager;
 461
 462         mutex_lock(&dpi->lock);
 463
 464         dss_mgr_disable(mgr);
 465
 466         if (dpi->pll) {
 467                 dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK);
 468                 dss_pll_disable(dpi->pll);
 469         }
 470
 471         dispc_runtime_put();
 472
 473         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 474                 regulator_disable(dpi->vdds_dsi_reg);
 475
 476         mutex_unlock(&dpi->lock);
 477 }
 478
 479 static void dpi_set_timings(struct omap_dss_device *dssdev,
 480                 struct omap_video_timings *timings)
 481 {
 482         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 483
 484         DSSDBG("dpi_set_timings\n");
 485
 486         mutex_lock(&dpi->lock);
 487
 488         dpi->timings = *timings;
 489
 490         mutex_unlock(&dpi->lock);
 491 }
 492
 493 static void dpi_get_timings(struct omap_dss_device *dssdev,
 494                 struct omap_video_timings *timings)
 495 {
 496         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 497
 498         mutex_lock(&dpi->lock);
 499
 500         *timings = dpi->timings;
 501
 502         mutex_unlock(&dpi->lock);
 503 }
 504
 505 static int dpi_check_timings(struct omap_dss_device *dssdev,
 506                         struct omap_video_timings *timings)
 507 {
 508         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 509         struct omap_overlay_manager *mgr = dpi->output.manager;
 510         int lck_div, pck_div;
 511         unsigned long fck;
 512         unsigned long pck;
 513         struct dpi_clk_calc_ctx ctx;
 514         bool ok;
 515
 516         if (mgr && !dispc_mgr_timings_ok(mgr->id, timings))
 517                 return -EINVAL;
 518
 519         if (timings->pixelclock == 0)
 520                 return -EINVAL;
 521
 522         if (dpi->pll) {
 523                 ok = dpi_dsi_clk_calc(dpi, timings->pixelclock, &ctx);
 524                 if (!ok)
 525                         return -EINVAL;
 526
 527                 fck = ctx.dsi_cinfo.clkout[HSDIV_DISPC];
 528         } else {
 529                 ok = dpi_dss_clk_calc(timings->pixelclock, &ctx);
 530                 if (!ok)
 531                         return -EINVAL;
 532
 533                 fck = ctx.fck;
 534         }
 535
 536         lck_div = ctx.dispc_cinfo.lck_div;
 537         pck_div = ctx.dispc_cinfo.pck_div;
 538
 539         pck = fck / lck_div / pck_div;
 540
 541         timings->pixelclock = pck;
 542
 543         return 0;
 544 }
 545
 546 static void dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 547 {
 548         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 549
 550         mutex_lock(&dpi->lock);
 551
 552         dpi->data_lines = data_lines;
 553
 554         mutex_unlock(&dpi->lock);
 555 }
 556
 557 static int dpi_verify_dsi_pll(struct dss_pll *pll)
 558 {
 559         int r;
 560
 561         /* do initial setup with the PLL to see if it is operational */
 562
 563         r = dss_pll_enable(pll);
 564         if (r)
 565                 return r;
 566
 567         dss_pll_disable(pll);
 568
 569         return 0;
 570 }
 571
 572 static int dpi_init_regulator(struct dpi_data *dpi)
 573 {
 574         struct regulator *vdds_dsi;
 575
 576         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 577                 return 0;
 578
 579         if (dpi->vdds_dsi_reg)
 580                 return 0;
 581
 582         vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
 583         if (IS_ERR(vdds_dsi)) {
 584                 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
 585                         DSSERR("can't get VDDS_DSI regulator\n");
 586                 return PTR_ERR(vdds_dsi);
 587         }
 588
 589         dpi->vdds_dsi_reg = vdds_dsi;
 590
 591         return 0;
 592 }
 593
 594 static void dpi_init_pll(struct dpi_data *dpi)
 595 {
 596         struct dss_pll *pll;
 597
 598         if (dpi->pll)
 599                 return;
 600
 601         pll = dpi_get_pll(dpi->output.dispc_channel);
 602         if (!pll)
 603                 return;
 604
 605         /* On DRA7 we need to set a mux to use the PLL */
 606         if (omapdss_get_version() == OMAPDSS_VER_DRA7xx)
 607                 dss_ctrl_pll_set_control_mux(pll->id, dpi->output.dispc_channel);
 608
 609         if (dpi_verify_dsi_pll(pll)) {
 610                 DSSWARN("DSI PLL not operational\n");
 611                 return;
 612         }
 613
 614         dpi->pll = pll;
 615 }
 616
 617 /*
 618  * Return a hardcoded channel for the DPI output. This should work for
 619  * current use cases, but this can be later expanded to either resolve
 620  * the channel in some more dynamic manner, or get the channel as a user
 621  * parameter.
 622  */
 623 static enum omap_channel dpi_get_channel(int port_num)
 624 {
 625         switch (omapdss_get_version()) {
 626         case OMAPDSS_VER_OMAP24xx:
 627         case OMAPDSS_VER_OMAP34xx_ES1:
 628         case OMAPDSS_VER_OMAP34xx_ES3:
 629         case OMAPDSS_VER_OMAP3630:
 630         case OMAPDSS_VER_AM35xx:
 631         case OMAPDSS_VER_AM43xx:
 632                 return OMAP_DSS_CHANNEL_LCD;
 633
 634         case OMAPDSS_VER_DRA7xx:
 635                 switch (port_num) {
 636                 case 2:
 637                         return OMAP_DSS_CHANNEL_LCD3;
 638                 case 1:
 639                         return OMAP_DSS_CHANNEL_LCD2;
 640                 case 0:
 641                 default:
 642                         return OMAP_DSS_CHANNEL_LCD;
 643                 }
 644
 645         case OMAPDSS_VER_OMAP4430_ES1:
 646         case OMAPDSS_VER_OMAP4430_ES2:
 647         case OMAPDSS_VER_OMAP4:
 648                 return OMAP_DSS_CHANNEL_LCD2;
 649
 650         case OMAPDSS_VER_OMAP5:
 651                 return OMAP_DSS_CHANNEL_LCD3;
 652
 653         default:
 654                 DSSWARN("unsupported DSS version\n");
 655                 return OMAP_DSS_CHANNEL_LCD;
 656         }
 657 }
 658
 659 static int dpi_connect(struct omap_dss_device *dssdev,
 660                 struct omap_dss_device *dst)
 661 {
 662         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 663         struct omap_overlay_manager *mgr;
 664         int r;
 665
 666         r = dpi_init_regulator(dpi);
 667         if (r)
 668                 return r;
 669
 670         dpi_init_pll(dpi);
 671
 672         mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
 673         if (!mgr)
 674                 return -ENODEV;
 675
 676         r = dss_mgr_connect(mgr, dssdev);
 677         if (r)
 678                 return r;
 679
 680         r = omapdss_output_set_device(dssdev, dst);
 681         if (r) {
 682                 DSSERR("failed to connect output to new device: %s\n",
 683                                 dst->name);
 684                 dss_mgr_disconnect(mgr, dssdev);
 685                 return r;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static void dpi_disconnect(struct omap_dss_device *dssdev,
 692                 struct omap_dss_device *dst)
 693 {
 694         WARN_ON(dst != dssdev->dst);
 695
 696         if (dst != dssdev->dst)
 697                 return;
 698
 699         omapdss_output_unset_device(dssdev);
 700
 701         if (dssdev->manager)
 702                 dss_mgr_disconnect(dssdev->manager, dssdev);
 703 }
 704
 705 static const struct omapdss_dpi_ops dpi_ops = {
 706         .connect = dpi_connect,
 707         .disconnect = dpi_disconnect,
 708
 709         .enable = dpi_display_enable,
 710         .disable = dpi_display_disable,
 711
 712         .check_timings = dpi_check_timings,
 713         .set_timings = dpi_set_timings,
 714         .get_timings = dpi_get_timings,
 715
 716         .set_data_lines = dpi_set_data_lines,
 717 };
 718
 719 static void dpi_init_output(struct platform_device *pdev)
 720 {
 721         struct dpi_data *dpi = dpi_get_data_from_pdev(pdev);
 722         struct omap_dss_device *out = &dpi->output;
 723
 724         out->dev = &pdev->dev;
 725         out->id = OMAP_DSS_OUTPUT_DPI;
 726         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 727         out->name = "dpi.0";
 728         out->dispc_channel = dpi_get_channel(0);
 729         out->ops.dpi = &dpi_ops;
 730         out->owner = THIS_MODULE;
 731
 732         omapdss_register_output(out);
 733 }
 734
 735 static void dpi_uninit_output(struct platform_device *pdev)
 736 {
 737         struct dpi_data *dpi = dpi_get_data_from_pdev(pdev);
 738         struct omap_dss_device *out = &dpi->output;
 739
 740         omapdss_unregister_output(out);
 741 }
 742
 743 static void dpi_init_output_port(struct platform_device *pdev,
 744         struct device_node *port)
 745 {
 746         struct dpi_data *dpi = port->data;
 747         struct omap_dss_device *out = &dpi->output;
 748         int r;
 749         u32 port_num;
 750
 751         r = of_property_read_u32(port, "reg", &port_num);
 752         if (r)
 753                 port_num = 0;
 754
 755         switch (port_num) {
 756         case 2:
 757                 out->name = "dpi.2";
 758                 break;
 759         case 1:
 760                 out->name = "dpi.1";
 761                 break;
 762         case 0:
 763         default:
 764                 out->name = "dpi.0";
 765                 break;
 766         }
 767
 768         out->dev = &pdev->dev;
 769         out->id = OMAP_DSS_OUTPUT_DPI;
 770         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 771         out->dispc_channel = dpi_get_channel(port_num);
 772         out->port_num = port_num;
 773         out->ops.dpi = &dpi_ops;
 774         out->owner = THIS_MODULE;
 775
 776         omapdss_register_output(out);
 777 }
 778
 779 static void dpi_uninit_output_port(struct device_node *port)
 780 {
 781         struct dpi_data *dpi = port->data;
 782         struct omap_dss_device *out = &dpi->output;
 783
 784         omapdss_unregister_output(out);
 785 }
 786
 787 static int dpi_bind(struct device *dev, struct device *master, void *data)
 788 {
 789         struct platform_device *pdev = to_platform_device(dev);
 790         struct dpi_data *dpi;
 791
 792         dpi = devm_kzalloc(&pdev->dev, sizeof(*dpi), GFP_KERNEL);
 793         if (!dpi)
 794                 return -ENOMEM;
 795
 796         dpi->pdev = pdev;
 797
 798         dev_set_drvdata(&pdev->dev, dpi);
 799
 800         mutex_init(&dpi->lock);
 801
 802         dpi_init_output(pdev);
 803
 804         return 0;
 805 }
 806
 807 static void dpi_unbind(struct device *dev, struct device *master, void *data)
 808 {
 809         struct platform_device *pdev = to_platform_device(dev);
 810
 811         dpi_uninit_output(pdev);
 812 }
 813
 814 static const struct component_ops dpi_component_ops = {
 815         .bind   = dpi_bind,
 816         .unbind = dpi_unbind,
 817 };
 818
 819 static int dpi_probe(struct platform_device *pdev)
 820 {
 821         return component_add(&pdev->dev, &dpi_component_ops);
 822 }
 823
 824 static int dpi_remove(struct platform_device *pdev)
 825 {
 826         component_del(&pdev->dev, &dpi_component_ops);
 827         return 0;
 828 }
 829
 830 static struct platform_driver omap_dpi_driver = {
 831         .probe          = dpi_probe,
 832         .remove         = dpi_remove,
 833         .driver         = {
 834                 .name   = "omapdss_dpi",
 835                 .suppress_bind_attrs = true,
 836         },
 837 };
 838
 839 int __init dpi_init_platform_driver(void)
 840 {
 841         return platform_driver_register(&omap_dpi_driver);
 842 }
 843
 844 void dpi_uninit_platform_driver(void)
 845 {
 846         platform_driver_unregister(&omap_dpi_driver);
 847 }
 848
 849 int dpi_init_port(struct platform_device *pdev, struct device_node *port)
 850 {
 851         struct dpi_data *dpi;
 852         struct device_node *ep;
 853         u32 datalines;
 854         int r;
 855
 856         dpi = devm_kzalloc(&pdev->dev, sizeof(*dpi), GFP_KERNEL);
 857         if (!dpi)
 858                 return -ENOMEM;
 859
 860         ep = omapdss_of_get_next_endpoint(port, NULL);
 861         if (!ep)
 862                 return 0;
 863
 864         r = of_property_read_u32(ep, "data-lines", &datalines);
 865         if (r) {
 866                 DSSERR("failed to parse datalines\n");
 867                 goto err_datalines;
 868         }
 869
 870         dpi->data_lines = datalines;
 871
 872         of_node_put(ep);
 873
 874         dpi->pdev = pdev;
 875         port->data = dpi;
 876
 877         mutex_init(&dpi->lock);
 878
 879         dpi_init_output_port(pdev, port);
 880
 881         dpi->port_initialized = true;
 882
 883         return 0;
 884
 885 err_datalines:
 886         of_node_put(ep);
 887
 888         return r;
 889 }
 890
 891 void dpi_uninit_port(struct device_node *port)
 892 {
 893         struct dpi_data *dpi = port->data;
 894
 895         if (!dpi->port_initialized)
 896                 return;
 897
 898         dpi_uninit_output_port(port);
 899 }