drivers/gpu/drm/omapdrm/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         enum omap_channel channel = out->dispc_channel;
 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, channel, 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(channel, 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         enum omap_channel channel = out->dispc_channel;
 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(channel, &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         enum omap_channel channel = out->dispc_channel;
 389         int r;
 390
 391         mutex_lock(&dpi->lock);
 392
 393         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi->vdds_dsi_reg) {
 394                 DSSERR("no VDSS_DSI regulator\n");
 395                 r = -ENODEV;
 396                 goto err_no_reg;
 397         }
 398
 399         if (!out->dispc_channel_connected) {
 400                 DSSERR("failed to enable display: no output/manager\n");
 401                 r = -ENODEV;
 402                 goto err_no_out_mgr;
 403         }
 404
 405         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 406                 r = regulator_enable(dpi->vdds_dsi_reg);
 407                 if (r)
 408                         goto err_reg_enable;
 409         }
 410
 411         r = dispc_runtime_get();
 412         if (r)
 413                 goto err_get_dispc;
 414
 415         r = dss_dpi_select_source(out->port_num, channel);
 416         if (r)
 417                 goto err_src_sel;
 418
 419         if (dpi->pll) {
 420                 r = dss_pll_enable(dpi->pll);
 421                 if (r)
 422                         goto err_dsi_pll_init;
 423         }
 424
 425         r = dpi_set_mode(dpi);
 426         if (r)
 427                 goto err_set_mode;
 428
 429         dpi_config_lcd_manager(dpi);
 430
 431         mdelay(2);
 432
 433         r = dss_mgr_enable(channel);
 434         if (r)
 435                 goto err_mgr_enable;
 436
 437         mutex_unlock(&dpi->lock);
 438
 439         return 0;
 440
 441 err_mgr_enable:
 442 err_set_mode:
 443         if (dpi->pll)
 444                 dss_pll_disable(dpi->pll);
 445 err_dsi_pll_init:
 446 err_src_sel:
 447         dispc_runtime_put();
 448 err_get_dispc:
 449         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 450                 regulator_disable(dpi->vdds_dsi_reg);
 451 err_reg_enable:
 452 err_no_out_mgr:
 453 err_no_reg:
 454         mutex_unlock(&dpi->lock);
 455         return r;
 456 }
 457
 458 static void dpi_display_disable(struct omap_dss_device *dssdev)
 459 {
 460         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 461         enum omap_channel channel = dpi->output.dispc_channel;
 462
 463         mutex_lock(&dpi->lock);
 464
 465         dss_mgr_disable(channel);
 466
 467         if (dpi->pll) {
 468                 dss_select_lcd_clk_source(channel, OMAP_DSS_CLK_SRC_FCK);
 469                 dss_pll_disable(dpi->pll);
 470         }
 471
 472         dispc_runtime_put();
 473
 474         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 475                 regulator_disable(dpi->vdds_dsi_reg);
 476
 477         mutex_unlock(&dpi->lock);
 478 }
 479
 480 static void dpi_set_timings(struct omap_dss_device *dssdev,
 481                 struct omap_video_timings *timings)
 482 {
 483         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 484
 485         DSSDBG("dpi_set_timings\n");
 486
 487         mutex_lock(&dpi->lock);
 488
 489         dpi->timings = *timings;
 490
 491         mutex_unlock(&dpi->lock);
 492 }
 493
 494 static void dpi_get_timings(struct omap_dss_device *dssdev,
 495                 struct omap_video_timings *timings)
 496 {
 497         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 498
 499         mutex_lock(&dpi->lock);
 500
 501         *timings = dpi->timings;
 502
 503         mutex_unlock(&dpi->lock);
 504 }
 505
 506 static int dpi_check_timings(struct omap_dss_device *dssdev,
 507                         struct omap_video_timings *timings)
 508 {
 509         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 510         enum omap_channel channel = dpi->output.dispc_channel;
 511         int lck_div, pck_div;
 512         unsigned long fck;
 513         unsigned long pck;
 514         struct dpi_clk_calc_ctx ctx;
 515         bool ok;
 516
 517         if (timings->x_res % 8 != 0)
 518                 return -EINVAL;
 519
 520         if (!dispc_mgr_timings_ok(channel, timings))
 521                 return -EINVAL;
 522
 523         if (timings->pixelclock == 0)
 524                 return -EINVAL;
 525
 526         if (dpi->pll) {
 527                 ok = dpi_dsi_clk_calc(dpi, timings->pixelclock, &ctx);
 528                 if (!ok)
 529                         return -EINVAL;
 530
 531                 fck = ctx.dsi_cinfo.clkout[HSDIV_DISPC];
 532         } else {
 533                 ok = dpi_dss_clk_calc(timings->pixelclock, &ctx);
 534                 if (!ok)
 535                         return -EINVAL;
 536
 537                 fck = ctx.fck;
 538         }
 539
 540         lck_div = ctx.dispc_cinfo.lck_div;
 541         pck_div = ctx.dispc_cinfo.pck_div;
 542
 543         pck = fck / lck_div / pck_div;
 544
 545         timings->pixelclock = pck;
 546
 547         return 0;
 548 }
 549
 550 static void dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 551 {
 552         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 553
 554         mutex_lock(&dpi->lock);
 555
 556         dpi->data_lines = data_lines;
 557
 558         mutex_unlock(&dpi->lock);
 559 }
 560
 561 static int dpi_verify_dsi_pll(struct dss_pll *pll)
 562 {
 563         int r;
 564
 565         /* do initial setup with the PLL to see if it is operational */
 566
 567         r = dss_pll_enable(pll);
 568         if (r)
 569                 return r;
 570
 571         dss_pll_disable(pll);
 572
 573         return 0;
 574 }
 575
 576 static int dpi_init_regulator(struct dpi_data *dpi)
 577 {
 578         struct regulator *vdds_dsi;
 579
 580         if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 581                 return 0;
 582
 583         if (dpi->vdds_dsi_reg)
 584                 return 0;
 585
 586         vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
 587         if (IS_ERR(vdds_dsi)) {
 588                 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
 589                         DSSERR("can't get VDDS_DSI regulator\n");
 590                 return PTR_ERR(vdds_dsi);
 591         }
 592
 593         dpi->vdds_dsi_reg = vdds_dsi;
 594
 595         return 0;
 596 }
 597
 598 static void dpi_init_pll(struct dpi_data *dpi)
 599 {
 600         struct dss_pll *pll;
 601
 602         if (dpi->pll)
 603                 return;
 604
 605         pll = dpi_get_pll(dpi->output.dispc_channel);
 606         if (!pll)
 607                 return;
 608
 609         /* On DRA7 we need to set a mux to use the PLL */
 610         if (omapdss_get_version() == OMAPDSS_VER_DRA7xx)
 611                 dss_ctrl_pll_set_control_mux(pll->id, dpi->output.dispc_channel);
 612
 613         if (dpi_verify_dsi_pll(pll)) {
 614                 DSSWARN("DSI PLL not operational\n");
 615                 return;
 616         }
 617
 618         dpi->pll = pll;
 619 }
 620
 621 /*
 622  * Return a hardcoded channel for the DPI output. This should work for
 623  * current use cases, but this can be later expanded to either resolve
 624  * the channel in some more dynamic manner, or get the channel as a user
 625  * parameter.
 626  */
 627 static enum omap_channel dpi_get_channel(int port_num)
 628 {
 629         switch (omapdss_get_version()) {
 630         case OMAPDSS_VER_OMAP24xx:
 631         case OMAPDSS_VER_OMAP34xx_ES1:
 632         case OMAPDSS_VER_OMAP34xx_ES3:
 633         case OMAPDSS_VER_OMAP3630:
 634         case OMAPDSS_VER_AM35xx:
 635         case OMAPDSS_VER_AM43xx:
 636                 return OMAP_DSS_CHANNEL_LCD;
 637
 638         case OMAPDSS_VER_DRA7xx:
 639                 switch (port_num) {
 640                 case 2:
 641                         return OMAP_DSS_CHANNEL_LCD3;
 642                 case 1:
 643                         return OMAP_DSS_CHANNEL_LCD2;
 644                 case 0:
 645                 default:
 646                         return OMAP_DSS_CHANNEL_LCD;
 647                 }
 648
 649         case OMAPDSS_VER_OMAP4430_ES1:
 650         case OMAPDSS_VER_OMAP4430_ES2:
 651         case OMAPDSS_VER_OMAP4:
 652                 return OMAP_DSS_CHANNEL_LCD2;
 653
 654         case OMAPDSS_VER_OMAP5:
 655                 return OMAP_DSS_CHANNEL_LCD3;
 656
 657         default:
 658                 DSSWARN("unsupported DSS version\n");
 659                 return OMAP_DSS_CHANNEL_LCD;
 660         }
 661 }
 662
 663 static int dpi_connect(struct omap_dss_device *dssdev,
 664                 struct omap_dss_device *dst)
 665 {
 666         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 667         enum omap_channel channel = dpi->output.dispc_channel;
 668         int r;
 669
 670         r = dpi_init_regulator(dpi);
 671         if (r)
 672                 return r;
 673
 674         dpi_init_pll(dpi);
 675
 676         r = dss_mgr_connect(channel, 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(channel, 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         struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
 695         enum omap_channel channel = dpi->output.dispc_channel;
 696
 697         WARN_ON(dst != dssdev->dst);
 698
 699         if (dst != dssdev->dst)
 700                 return;
 701
 702         omapdss_output_unset_device(dssdev);
 703
 704         dss_mgr_disconnect(channel, dssdev);
 705 }
 706
 707 static const struct omapdss_dpi_ops dpi_ops = {
 708         .connect = dpi_connect,
 709         .disconnect = dpi_disconnect,
 710
 711         .enable = dpi_display_enable,
 712         .disable = dpi_display_disable,
 713
 714         .check_timings = dpi_check_timings,
 715         .set_timings = dpi_set_timings,
 716         .get_timings = dpi_get_timings,
 717
 718         .set_data_lines = dpi_set_data_lines,
 719 };
 720
 721 static void dpi_init_output(struct platform_device *pdev)
 722 {
 723         struct dpi_data *dpi = dpi_get_data_from_pdev(pdev);
 724         struct omap_dss_device *out = &dpi->output;
 725
 726         out->dev = &pdev->dev;
 727         out->id = OMAP_DSS_OUTPUT_DPI;
 728         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 729         out->name = "dpi.0";
 730         out->dispc_channel = dpi_get_channel(0);
 731         out->ops.dpi = &dpi_ops;
 732         out->owner = THIS_MODULE;
 733
 734         omapdss_register_output(out);
 735 }
 736
 737 static void dpi_uninit_output(struct platform_device *pdev)
 738 {
 739         struct dpi_data *dpi = dpi_get_data_from_pdev(pdev);
 740         struct omap_dss_device *out = &dpi->output;
 741
 742         omapdss_unregister_output(out);
 743 }
 744
 745 static void dpi_init_output_port(struct platform_device *pdev,
 746         struct device_node *port)
 747 {
 748         struct dpi_data *dpi = port->data;
 749         struct omap_dss_device *out = &dpi->output;
 750         int r;
 751         u32 port_num;
 752
 753         r = of_property_read_u32(port, "reg", &port_num);
 754         if (r)
 755                 port_num = 0;
 756
 757         switch (port_num) {
 758         case 2:
 759                 out->name = "dpi.2";
 760                 break;
 761         case 1:
 762                 out->name = "dpi.1";
 763                 break;
 764         case 0:
 765         default:
 766                 out->name = "dpi.0";
 767                 break;
 768         }
 769
 770         out->dev = &pdev->dev;
 771         out->id = OMAP_DSS_OUTPUT_DPI;
 772         out->output_type = OMAP_DISPLAY_TYPE_DPI;
 773         out->dispc_channel = dpi_get_channel(port_num);
 774         out->port_num = port_num;
 775         out->ops.dpi = &dpi_ops;
 776         out->owner = THIS_MODULE;
 777
 778         omapdss_register_output(out);
 779 }
 780
 781 static void dpi_uninit_output_port(struct device_node *port)
 782 {
 783         struct dpi_data *dpi = port->data;
 784         struct omap_dss_device *out = &dpi->output;
 785
 786         omapdss_unregister_output(out);
 787 }
 788
 789 static int dpi_bind(struct device *dev, struct device *master, void *data)
 790 {
 791         struct platform_device *pdev = to_platform_device(dev);
 792         struct dpi_data *dpi;
 793
 794         dpi = devm_kzalloc(&pdev->dev, sizeof(*dpi), GFP_KERNEL);
 795         if (!dpi)
 796                 return -ENOMEM;
 797
 798         dpi->pdev = pdev;
 799
 800         dev_set_drvdata(&pdev->dev, dpi);
 801
 802         mutex_init(&dpi->lock);
 803
 804         dpi_init_output(pdev);
 805
 806         return 0;
 807 }
 808
 809 static void dpi_unbind(struct device *dev, struct device *master, void *data)
 810 {
 811         struct platform_device *pdev = to_platform_device(dev);
 812
 813         dpi_uninit_output(pdev);
 814 }
 815
 816 static const struct component_ops dpi_component_ops = {
 817         .bind   = dpi_bind,
 818         .unbind = dpi_unbind,
 819 };
 820
 821 static int dpi_probe(struct platform_device *pdev)
 822 {
 823         return component_add(&pdev->dev, &dpi_component_ops);
 824 }
 825
 826 static int dpi_remove(struct platform_device *pdev)
 827 {
 828         component_del(&pdev->dev, &dpi_component_ops);
 829         return 0;
 830 }
 831
 832 static struct platform_driver omap_dpi_driver = {
 833         .probe          = dpi_probe,
 834         .remove         = dpi_remove,
 835         .driver         = {
 836                 .name   = "omapdss_dpi",
 837                 .suppress_bind_attrs = true,
 838         },
 839 };
 840
 841 int __init dpi_init_platform_driver(void)
 842 {
 843         return platform_driver_register(&omap_dpi_driver);
 844 }
 845
 846 void dpi_uninit_platform_driver(void)
 847 {
 848         platform_driver_unregister(&omap_dpi_driver);
 849 }
 850
 851 int dpi_init_port(struct platform_device *pdev, struct device_node *port)
 852 {
 853         struct dpi_data *dpi;
 854         struct device_node *ep;
 855         u32 datalines;
 856         int r;
 857
 858         dpi = devm_kzalloc(&pdev->dev, sizeof(*dpi), GFP_KERNEL);
 859         if (!dpi)
 860                 return -ENOMEM;
 861
 862         ep = omapdss_of_get_next_endpoint(port, NULL);
 863         if (!ep)
 864                 return 0;
 865
 866         r = of_property_read_u32(ep, "data-lines", &datalines);
 867         if (r) {
 868                 DSSERR("failed to parse datalines\n");
 869                 goto err_datalines;
 870         }
 871
 872         dpi->data_lines = datalines;
 873
 874         of_node_put(ep);
 875
 876         dpi->pdev = pdev;
 877         port->data = dpi;
 878
 879         mutex_init(&dpi->lock);
 880
 881         dpi_init_output_port(pdev, port);
 882
 883         dpi->port_initialized = true;
 884
 885         return 0;
 886
 887 err_datalines:
 888         of_node_put(ep);
 889
 890         return r;
 891 }
 892
 893 void dpi_uninit_port(struct device_node *port)
 894 {
 895         struct dpi_data *dpi = port->data;
 896
 897         if (!dpi->port_initialized)
 898                 return;
 899
 900         dpi_uninit_output_port(port);
 901 }