drivers/video/fbdev/omap2/dss/hdmi4.c

   1 /*
   2  * HDMI interface DSS driver for TI's OMAP4 family of SoCs.
   3  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
   4  * Authors: Yong Zhi
   5  *      Mythri pk <mythripk@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #define DSS_SUBSYS_NAME "HDMI"
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/mutex.h>
  28 #include <linux/delay.h>
  29 #include <linux/string.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/clk.h>
  33 #include <linux/gpio.h>
  34 #include <linux/regulator/consumer.h>
  35 #include <video/omapdss.h>
  36
  37 #include "hdmi4_core.h"
  38 #include "dss.h"
  39 #include "dss_features.h"
  40
  41 static struct {
  42         struct mutex lock;
  43         struct platform_device *pdev;
  44
  45         struct hdmi_wp_data     wp;
  46         struct hdmi_pll_data    pll;
  47         struct hdmi_phy_data    phy;
  48         struct hdmi_core_data   core;
  49
  50         struct hdmi_config cfg;
  51
  52         struct clk *sys_clk;
  53         struct regulator *vdda_hdmi_dac_reg;
  54
  55         bool core_enabled;
  56
  57         struct omap_dss_device output;
  58 } hdmi;
  59
  60 static int hdmi_runtime_get(void)
  61 {
  62         int r;
  63
  64         DSSDBG("hdmi_runtime_get\n");
  65
  66         r = pm_runtime_get_sync(&hdmi.pdev->dev);
  67         WARN_ON(r < 0);
  68         if (r < 0)
  69                 return r;
  70
  71         return 0;
  72 }
  73
  74 static void hdmi_runtime_put(void)
  75 {
  76         int r;
  77
  78         DSSDBG("hdmi_runtime_put\n");
  79
  80         r = pm_runtime_put_sync(&hdmi.pdev->dev);
  81         WARN_ON(r < 0 && r != -ENOSYS);
  82 }
  83
  84 static irqreturn_t hdmi_irq_handler(int irq, void *data)
  85 {
  86         struct hdmi_wp_data *wp = data;
  87         u32 irqstatus;
  88
  89         irqstatus = hdmi_wp_get_irqstatus(wp);
  90         hdmi_wp_set_irqstatus(wp, irqstatus);
  91
  92         if ((irqstatus & HDMI_IRQ_LINK_CONNECT) &&
  93                         irqstatus & HDMI_IRQ_LINK_DISCONNECT) {
  94                 /*
  95                  * If we get both connect and disconnect interrupts at the same
  96                  * time, turn off the PHY, clear interrupts, and restart, which
  97                  * raises connect interrupt if a cable is connected, or nothing
  98                  * if cable is not connected.
  99                  */
 100                 hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_OFF);
 101
 102                 hdmi_wp_set_irqstatus(wp, HDMI_IRQ_LINK_CONNECT |
 103                                 HDMI_IRQ_LINK_DISCONNECT);
 104
 105                 hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
 106         } else if (irqstatus & HDMI_IRQ_LINK_CONNECT) {
 107                 hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_TXON);
 108         } else if (irqstatus & HDMI_IRQ_LINK_DISCONNECT) {
 109                 hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
 110         }
 111
 112         return IRQ_HANDLED;
 113 }
 114
 115 static int hdmi_init_regulator(void)
 116 {
 117         int r;
 118         struct regulator *reg;
 119
 120         if (hdmi.vdda_hdmi_dac_reg != NULL)
 121                 return 0;
 122
 123         reg = devm_regulator_get(&hdmi.pdev->dev, "vdda");
 124
 125         if (IS_ERR(reg)) {
 126                 if (PTR_ERR(reg) != -EPROBE_DEFER)
 127                         DSSERR("can't get VDDA regulator\n");
 128                 return PTR_ERR(reg);
 129         }
 130
 131         if (regulator_can_change_voltage(reg)) {
 132                 r = regulator_set_voltage(reg, 1800000, 1800000);
 133                 if (r) {
 134                         devm_regulator_put(reg);
 135                         DSSWARN("can't set the regulator voltage\n");
 136                         return r;
 137                 }
 138         }
 139
 140         hdmi.vdda_hdmi_dac_reg = reg;
 141
 142         return 0;
 143 }
 144
 145 static int hdmi_power_on_core(struct omap_dss_device *dssdev)
 146 {
 147         int r;
 148
 149         r = regulator_enable(hdmi.vdda_hdmi_dac_reg);
 150         if (r)
 151                 return r;
 152
 153         r = hdmi_runtime_get();
 154         if (r)
 155                 goto err_runtime_get;
 156
 157         /* Make selection of HDMI in DSS */
 158         dss_select_hdmi_venc_clk_source(DSS_HDMI_M_PCLK);
 159
 160         hdmi.core_enabled = true;
 161
 162         return 0;
 163
 164 err_runtime_get:
 165         regulator_disable(hdmi.vdda_hdmi_dac_reg);
 166
 167         return r;
 168 }
 169
 170 static void hdmi_power_off_core(struct omap_dss_device *dssdev)
 171 {
 172         hdmi.core_enabled = false;
 173
 174         hdmi_runtime_put();
 175         regulator_disable(hdmi.vdda_hdmi_dac_reg);
 176 }
 177
 178 static int hdmi_power_on_full(struct omap_dss_device *dssdev)
 179 {
 180         int r;
 181         struct omap_video_timings *p;
 182         struct omap_overlay_manager *mgr = hdmi.output.manager;
 183         unsigned long phy;
 184         struct hdmi_wp_data *wp = &hdmi.wp;
 185
 186         r = hdmi_power_on_core(dssdev);
 187         if (r)
 188                 return r;
 189
 190         /* disable and clear irqs */
 191         hdmi_wp_clear_irqenable(wp, 0xffffffff);
 192         hdmi_wp_set_irqstatus(wp, 0xffffffff);
 193
 194         p = &hdmi.cfg.timings;
 195
 196         DSSDBG("hdmi_power_on x_res= %d y_res = %d\n", p->x_res, p->y_res);
 197
 198         /* the functions below use kHz pixel clock. TODO: change to Hz */
 199         phy = p->pixelclock / 1000;
 200
 201         hdmi_pll_compute(&hdmi.pll, clk_get_rate(hdmi.sys_clk), phy);
 202
 203         /* config the PLL and PHY hdmi_set_pll_pwrfirst */
 204         r = hdmi_pll_enable(&hdmi.pll, &hdmi.wp);
 205         if (r) {
 206                 DSSDBG("Failed to lock PLL\n");
 207                 goto err_pll_enable;
 208         }
 209
 210         r = hdmi_phy_configure(&hdmi.phy, &hdmi.cfg);
 211         if (r) {
 212                 DSSDBG("Failed to configure PHY\n");
 213                 goto err_phy_cfg;
 214         }
 215
 216         r = hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
 217         if (r)
 218                 goto err_phy_pwr;
 219
 220         hdmi4_configure(&hdmi.core, &hdmi.wp, &hdmi.cfg);
 221
 222         /* bypass TV gamma table */
 223         dispc_enable_gamma_table(0);
 224
 225         /* tv size */
 226         dss_mgr_set_timings(mgr, p);
 227
 228         r = hdmi_wp_video_start(&hdmi.wp);
 229         if (r)
 230                 goto err_vid_enable;
 231
 232         r = dss_mgr_enable(mgr);
 233         if (r)
 234                 goto err_mgr_enable;
 235
 236         hdmi_wp_set_irqenable(wp,
 237                 HDMI_IRQ_LINK_CONNECT | HDMI_IRQ_LINK_DISCONNECT);
 238
 239         return 0;
 240
 241 err_mgr_enable:
 242         hdmi_wp_video_stop(&hdmi.wp);
 243 err_vid_enable:
 244 err_phy_cfg:
 245         hdmi_wp_set_phy_pwr(&hdmi.wp, HDMI_PHYPWRCMD_OFF);
 246 err_phy_pwr:
 247         hdmi_pll_disable(&hdmi.pll, &hdmi.wp);
 248 err_pll_enable:
 249         hdmi_power_off_core(dssdev);
 250         return -EIO;
 251 }
 252
 253 static void hdmi_power_off_full(struct omap_dss_device *dssdev)
 254 {
 255         struct omap_overlay_manager *mgr = hdmi.output.manager;
 256
 257         hdmi_wp_clear_irqenable(&hdmi.wp, 0xffffffff);
 258
 259         dss_mgr_disable(mgr);
 260
 261         hdmi_wp_video_stop(&hdmi.wp);
 262
 263         hdmi_wp_set_phy_pwr(&hdmi.wp, HDMI_PHYPWRCMD_OFF);
 264
 265         hdmi_pll_disable(&hdmi.pll, &hdmi.wp);
 266
 267         hdmi_power_off_core(dssdev);
 268 }
 269
 270 static int hdmi_display_check_timing(struct omap_dss_device *dssdev,
 271                                         struct omap_video_timings *timings)
 272 {
 273         struct omap_dss_device *out = &hdmi.output;
 274
 275         if (!dispc_mgr_timings_ok(out->dispc_channel, timings))
 276                 return -EINVAL;
 277
 278         return 0;
 279 }
 280
 281 static void hdmi_display_set_timing(struct omap_dss_device *dssdev,
 282                 struct omap_video_timings *timings)
 283 {
 284         mutex_lock(&hdmi.lock);
 285
 286         hdmi.cfg.timings = *timings;
 287
 288         dispc_set_tv_pclk(timings->pixelclock);
 289
 290         mutex_unlock(&hdmi.lock);
 291 }
 292
 293 static void hdmi_display_get_timings(struct omap_dss_device *dssdev,
 294                 struct omap_video_timings *timings)
 295 {
 296         *timings = hdmi.cfg.timings;
 297 }
 298
 299 static void hdmi_dump_regs(struct seq_file *s)
 300 {
 301         mutex_lock(&hdmi.lock);
 302
 303         if (hdmi_runtime_get()) {
 304                 mutex_unlock(&hdmi.lock);
 305                 return;
 306         }
 307
 308         hdmi_wp_dump(&hdmi.wp, s);
 309         hdmi_pll_dump(&hdmi.pll, s);
 310         hdmi_phy_dump(&hdmi.phy, s);
 311         hdmi4_core_dump(&hdmi.core, s);
 312
 313         hdmi_runtime_put();
 314         mutex_unlock(&hdmi.lock);
 315 }
 316
 317 static int read_edid(u8 *buf, int len)
 318 {
 319         int r;
 320
 321         mutex_lock(&hdmi.lock);
 322
 323         r = hdmi_runtime_get();
 324         BUG_ON(r);
 325
 326         r = hdmi4_read_edid(&hdmi.core,  buf, len);
 327
 328         hdmi_runtime_put();
 329         mutex_unlock(&hdmi.lock);
 330
 331         return r;
 332 }
 333
 334 static int hdmi_display_enable(struct omap_dss_device *dssdev)
 335 {
 336         struct omap_dss_device *out = &hdmi.output;
 337         int r = 0;
 338
 339         DSSDBG("ENTER hdmi_display_enable\n");
 340
 341         mutex_lock(&hdmi.lock);
 342
 343         if (out == NULL || out->manager == NULL) {
 344                 DSSERR("failed to enable display: no output/manager\n");
 345                 r = -ENODEV;
 346                 goto err0;
 347         }
 348
 349         r = hdmi_power_on_full(dssdev);
 350         if (r) {
 351                 DSSERR("failed to power on device\n");
 352                 goto err0;
 353         }
 354
 355         mutex_unlock(&hdmi.lock);
 356         return 0;
 357
 358 err0:
 359         mutex_unlock(&hdmi.lock);
 360         return r;
 361 }
 362
 363 static void hdmi_display_disable(struct omap_dss_device *dssdev)
 364 {
 365         DSSDBG("Enter hdmi_display_disable\n");
 366
 367         mutex_lock(&hdmi.lock);
 368
 369         hdmi_power_off_full(dssdev);
 370
 371         mutex_unlock(&hdmi.lock);
 372 }
 373
 374 static int hdmi_core_enable(struct omap_dss_device *dssdev)
 375 {
 376         int r = 0;
 377
 378         DSSDBG("ENTER omapdss_hdmi_core_enable\n");
 379
 380         mutex_lock(&hdmi.lock);
 381
 382         r = hdmi_power_on_core(dssdev);
 383         if (r) {
 384                 DSSERR("failed to power on device\n");
 385                 goto err0;
 386         }
 387
 388         mutex_unlock(&hdmi.lock);
 389         return 0;
 390
 391 err0:
 392         mutex_unlock(&hdmi.lock);
 393         return r;
 394 }
 395
 396 static void hdmi_core_disable(struct omap_dss_device *dssdev)
 397 {
 398         DSSDBG("Enter omapdss_hdmi_core_disable\n");
 399
 400         mutex_lock(&hdmi.lock);
 401
 402         hdmi_power_off_core(dssdev);
 403
 404         mutex_unlock(&hdmi.lock);
 405 }
 406
 407 static int hdmi_get_clocks(struct platform_device *pdev)
 408 {
 409         struct clk *clk;
 410
 411         clk = devm_clk_get(&pdev->dev, "sys_clk");
 412         if (IS_ERR(clk)) {
 413                 DSSERR("can't get sys_clk\n");
 414                 return PTR_ERR(clk);
 415         }
 416
 417         hdmi.sys_clk = clk;
 418
 419         return 0;
 420 }
 421
 422 static int hdmi_connect(struct omap_dss_device *dssdev,
 423                 struct omap_dss_device *dst)
 424 {
 425         struct omap_overlay_manager *mgr;
 426         int r;
 427
 428         r = hdmi_init_regulator();
 429         if (r)
 430                 return r;
 431
 432         mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
 433         if (!mgr)
 434                 return -ENODEV;
 435
 436         r = dss_mgr_connect(mgr, dssdev);
 437         if (r)
 438                 return r;
 439
 440         r = omapdss_output_set_device(dssdev, dst);
 441         if (r) {
 442                 DSSERR("failed to connect output to new device: %s\n",
 443                                 dst->name);
 444                 dss_mgr_disconnect(mgr, dssdev);
 445                 return r;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static void hdmi_disconnect(struct omap_dss_device *dssdev,
 452                 struct omap_dss_device *dst)
 453 {
 454         WARN_ON(dst != dssdev->dst);
 455
 456         if (dst != dssdev->dst)
 457                 return;
 458
 459         omapdss_output_unset_device(dssdev);
 460
 461         if (dssdev->manager)
 462                 dss_mgr_disconnect(dssdev->manager, dssdev);
 463 }
 464
 465 static int hdmi_read_edid(struct omap_dss_device *dssdev,
 466                 u8 *edid, int len)
 467 {
 468         bool need_enable;
 469         int r;
 470
 471         need_enable = hdmi.core_enabled == false;
 472
 473         if (need_enable) {
 474                 r = hdmi_core_enable(dssdev);
 475                 if (r)
 476                         return r;
 477         }
 478
 479         r = read_edid(edid, len);
 480
 481         if (need_enable)
 482                 hdmi_core_disable(dssdev);
 483
 484         return r;
 485 }
 486
 487 #if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
 488 static int hdmi_audio_enable(struct omap_dss_device *dssdev)
 489 {
 490         int r;
 491
 492         mutex_lock(&hdmi.lock);
 493
 494         if (!hdmi_mode_has_audio(hdmi.cfg.hdmi_dvi_mode)) {
 495                 r = -EPERM;
 496                 goto err;
 497         }
 498
 499         r = hdmi_wp_audio_enable(&hdmi.wp, true);
 500         if (r)
 501                 goto err;
 502
 503         mutex_unlock(&hdmi.lock);
 504         return 0;
 505
 506 err:
 507         mutex_unlock(&hdmi.lock);
 508         return r;
 509 }
 510
 511 static void hdmi_audio_disable(struct omap_dss_device *dssdev)
 512 {
 513         hdmi_wp_audio_enable(&hdmi.wp, false);
 514 }
 515
 516 static int hdmi_audio_start(struct omap_dss_device *dssdev)
 517 {
 518         return hdmi4_audio_start(&hdmi.core, &hdmi.wp);
 519 }
 520
 521 static void hdmi_audio_stop(struct omap_dss_device *dssdev)
 522 {
 523         hdmi4_audio_stop(&hdmi.core, &hdmi.wp);
 524 }
 525
 526 static bool hdmi_audio_supported(struct omap_dss_device *dssdev)
 527 {
 528         bool r;
 529
 530         mutex_lock(&hdmi.lock);
 531
 532         r = hdmi_mode_has_audio(hdmi.cfg.hdmi_dvi_mode);
 533
 534         mutex_unlock(&hdmi.lock);
 535         return r;
 536 }
 537
 538 static int hdmi_audio_config(struct omap_dss_device *dssdev,
 539                 struct omap_dss_audio *audio)
 540 {
 541         int r;
 542         u32 pclk = hdmi.cfg.timings.pixelclock;
 543
 544         mutex_lock(&hdmi.lock);
 545
 546         if (!hdmi_mode_has_audio(hdmi.cfg.hdmi_dvi_mode)) {
 547                 r = -EPERM;
 548                 goto err;
 549         }
 550
 551         r = hdmi4_audio_config(&hdmi.core, &hdmi.wp, audio, pclk);
 552         if (r)
 553                 goto err;
 554
 555         mutex_unlock(&hdmi.lock);
 556         return 0;
 557
 558 err:
 559         mutex_unlock(&hdmi.lock);
 560         return r;
 561 }
 562 #else
 563 static int hdmi_audio_enable(struct omap_dss_device *dssdev)
 564 {
 565         return -EPERM;
 566 }
 567
 568 static void hdmi_audio_disable(struct omap_dss_device *dssdev)
 569 {
 570 }
 571
 572 static int hdmi_audio_start(struct omap_dss_device *dssdev)
 573 {
 574         return -EPERM;
 575 }
 576
 577 static void hdmi_audio_stop(struct omap_dss_device *dssdev)
 578 {
 579 }
 580
 581 static bool hdmi_audio_supported(struct omap_dss_device *dssdev)
 582 {
 583         return false;
 584 }
 585
 586 static int hdmi_audio_config(struct omap_dss_device *dssdev,
 587                 struct omap_dss_audio *audio)
 588 {
 589         return -EPERM;
 590 }
 591 #endif
 592
 593 static int hdmi_set_infoframe(struct omap_dss_device *dssdev,
 594                 const struct hdmi_avi_infoframe *avi)
 595 {
 596         hdmi.cfg.infoframe = *avi;
 597         return 0;
 598 }
 599
 600 static int hdmi_set_hdmi_mode(struct omap_dss_device *dssdev,
 601                 bool hdmi_mode)
 602 {
 603         hdmi.cfg.hdmi_dvi_mode = hdmi_mode ? HDMI_HDMI : HDMI_DVI;
 604         return 0;
 605 }
 606
 607 static const struct omapdss_hdmi_ops hdmi_ops = {
 608         .connect                = hdmi_connect,
 609         .disconnect             = hdmi_disconnect,
 610
 611         .enable                 = hdmi_display_enable,
 612         .disable                = hdmi_display_disable,
 613
 614         .check_timings          = hdmi_display_check_timing,
 615         .set_timings            = hdmi_display_set_timing,
 616         .get_timings            = hdmi_display_get_timings,
 617
 618         .read_edid              = hdmi_read_edid,
 619         .set_infoframe          = hdmi_set_infoframe,
 620         .set_hdmi_mode          = hdmi_set_hdmi_mode,
 621
 622         .audio_enable           = hdmi_audio_enable,
 623         .audio_disable          = hdmi_audio_disable,
 624         .audio_start            = hdmi_audio_start,
 625         .audio_stop             = hdmi_audio_stop,
 626         .audio_supported        = hdmi_audio_supported,
 627         .audio_config           = hdmi_audio_config,
 628 };
 629
 630 static void hdmi_init_output(struct platform_device *pdev)
 631 {
 632         struct omap_dss_device *out = &hdmi.output;
 633
 634         out->dev = &pdev->dev;
 635         out->id = OMAP_DSS_OUTPUT_HDMI;
 636         out->output_type = OMAP_DISPLAY_TYPE_HDMI;
 637         out->name = "hdmi.0";
 638         out->dispc_channel = OMAP_DSS_CHANNEL_DIGIT;
 639         out->ops.hdmi = &hdmi_ops;
 640         out->owner = THIS_MODULE;
 641
 642         omapdss_register_output(out);
 643 }
 644
 645 static void __exit hdmi_uninit_output(struct platform_device *pdev)
 646 {
 647         struct omap_dss_device *out = &hdmi.output;
 648
 649         omapdss_unregister_output(out);
 650 }
 651
 652 static int hdmi_probe_of(struct platform_device *pdev)
 653 {
 654         struct device_node *node = pdev->dev.of_node;
 655         struct device_node *ep;
 656         int r;
 657
 658         ep = omapdss_of_get_first_endpoint(node);
 659         if (!ep)
 660                 return 0;
 661
 662         r = hdmi_parse_lanes_of(pdev, ep, &hdmi.phy);
 663         if (r)
 664                 goto err;
 665
 666         of_node_put(ep);
 667         return 0;
 668
 669 err:
 670         of_node_put(ep);
 671         return r;
 672 }
 673
 674 /* HDMI HW IP initialisation */
 675 static int omapdss_hdmihw_probe(struct platform_device *pdev)
 676 {
 677         int r;
 678         int irq;
 679
 680         hdmi.pdev = pdev;
 681
 682         mutex_init(&hdmi.lock);
 683
 684         if (pdev->dev.of_node) {
 685                 r = hdmi_probe_of(pdev);
 686                 if (r)
 687                         return r;
 688         }
 689
 690         r = hdmi_wp_init(pdev, &hdmi.wp);
 691         if (r)
 692                 return r;
 693
 694         r = hdmi_pll_init(pdev, &hdmi.pll);
 695         if (r)
 696                 return r;
 697
 698         r = hdmi_phy_init(pdev, &hdmi.phy);
 699         if (r)
 700                 return r;
 701
 702         r = hdmi4_core_init(pdev, &hdmi.core);
 703         if (r)
 704                 return r;
 705
 706         r = hdmi_get_clocks(pdev);
 707         if (r) {
 708                 DSSERR("can't get clocks\n");
 709                 return r;
 710         }
 711
 712         irq = platform_get_irq(pdev, 0);
 713         if (irq < 0) {
 714                 DSSERR("platform_get_irq failed\n");
 715                 return -ENODEV;
 716         }
 717
 718         r = devm_request_threaded_irq(&pdev->dev, irq,
 719                         NULL, hdmi_irq_handler,
 720                         IRQF_ONESHOT, "OMAP HDMI", &hdmi.wp);
 721         if (r) {
 722                 DSSERR("HDMI IRQ request failed\n");
 723                 return r;
 724         }
 725
 726         pm_runtime_enable(&pdev->dev);
 727
 728         hdmi_init_output(pdev);
 729
 730         dss_debugfs_create_file("hdmi", hdmi_dump_regs);
 731
 732         return 0;
 733 }
 734
 735 static int __exit omapdss_hdmihw_remove(struct platform_device *pdev)
 736 {
 737         hdmi_uninit_output(pdev);
 738
 739         pm_runtime_disable(&pdev->dev);
 740
 741         return 0;
 742 }
 743
 744 static int hdmi_runtime_suspend(struct device *dev)
 745 {
 746         clk_disable_unprepare(hdmi.sys_clk);
 747
 748         dispc_runtime_put();
 749
 750         return 0;
 751 }
 752
 753 static int hdmi_runtime_resume(struct device *dev)
 754 {
 755         int r;
 756
 757         r = dispc_runtime_get();
 758         if (r < 0)
 759                 return r;
 760
 761         clk_prepare_enable(hdmi.sys_clk);
 762
 763         return 0;
 764 }
 765
 766 static const struct dev_pm_ops hdmi_pm_ops = {
 767         .runtime_suspend = hdmi_runtime_suspend,
 768         .runtime_resume = hdmi_runtime_resume,
 769 };
 770
 771 static const struct of_device_id hdmi_of_match[] = {
 772         { .compatible = "ti,omap4-hdmi", },
 773         {},
 774 };
 775
 776 static struct platform_driver omapdss_hdmihw_driver = {
 777         .probe          = omapdss_hdmihw_probe,
 778         .remove         = __exit_p(omapdss_hdmihw_remove),
 779         .driver         = {
 780                 .name   = "omapdss_hdmi",
 781                 .owner  = THIS_MODULE,
 782                 .pm     = &hdmi_pm_ops,
 783                 .of_match_table = hdmi_of_match,
 784         },
 785 };
 786
 787 int __init hdmi4_init_platform_driver(void)
 788 {
 789         return platform_driver_register(&omapdss_hdmihw_driver);
 790 }
 791
 792 void __exit hdmi4_uninit_platform_driver(void)
 793 {
 794         platform_driver_unregister(&omapdss_hdmihw_driver);
 795 }