drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c

   1 /*
   2  * Generic DSI Command Mode panel driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments
   5  * Author: Tomi Valkeinen <tomi.valkeinen@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
  12 /* #define DEBUG */
  13
  14 #include <linux/backlight.h>
  15 #include <linux/delay.h>
  16 #include <linux/fb.h>
  17 #include <linux/gpio.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/sched.h>
  23 #include <linux/slab.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/of_device.h>
  26 #include <linux/of_gpio.h>
  27
  28 #include <video/omapdss.h>
  29 #include <video/omap-panel-data.h>
  30 #include <video/mipi_display.h>
  31
  32 /* DSI Virtual channel. Hardcoded for now. */
  33 #define TCH 0
  34
  35 #define DCS_READ_NUM_ERRORS     0x05
  36 #define DCS_BRIGHTNESS          0x51
  37 #define DCS_CTRL_DISPLAY        0x53
  38 #define DCS_GET_ID1             0xda
  39 #define DCS_GET_ID2             0xdb
  40 #define DCS_GET_ID3             0xdc
  41
  42 struct panel_drv_data {
  43         struct omap_dss_device dssdev;
  44         struct omap_dss_device *in;
  45
  46         struct omap_video_timings timings;
  47
  48         struct platform_device *pdev;
  49
  50         struct mutex lock;
  51
  52         struct backlight_device *bldev;
  53
  54         unsigned long   hw_guard_end;   /* next value of jiffies when we can
  55                                          * issue the next sleep in/out command
  56                                          */
  57         unsigned long   hw_guard_wait;  /* max guard time in jiffies */
  58
  59         /* panel HW configuration from DT or platform data */
  60         int reset_gpio;
  61         int ext_te_gpio;
  62
  63         bool use_dsi_backlight;
  64
  65         struct omap_dsi_pin_config pin_config;
  66
  67         /* runtime variables */
  68         bool enabled;
  69
  70         bool te_enabled;
  71
  72         atomic_t do_update;
  73         int channel;
  74
  75         struct delayed_work te_timeout_work;
  76
  77         bool intro_printed;
  78
  79         struct workqueue_struct *workqueue;
  80
  81         bool ulps_enabled;
  82         unsigned ulps_timeout;
  83         struct delayed_work ulps_work;
  84 };
  85
  86 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  87
  88 static irqreturn_t dsicm_te_isr(int irq, void *data);
  89 static void dsicm_te_timeout_work_callback(struct work_struct *work);
  90 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
  91
  92 static int dsicm_panel_reset(struct panel_drv_data *ddata);
  93
  94 static void dsicm_ulps_work(struct work_struct *work);
  95
  96 static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
  97 {
  98         ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
  99         ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
 100 }
 101
 102 static void hw_guard_wait(struct panel_drv_data *ddata)
 103 {
 104         unsigned long wait = ddata->hw_guard_end - jiffies;
 105
 106         if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
 107                 set_current_state(TASK_UNINTERRUPTIBLE);
 108                 schedule_timeout(wait);
 109         }
 110 }
 111
 112 static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
 113 {
 114         struct omap_dss_device *in = ddata->in;
 115         int r;
 116         u8 buf[1];
 117
 118         r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
 119
 120         if (r < 0)
 121                 return r;
 122
 123         *data = buf[0];
 124
 125         return 0;
 126 }
 127
 128 static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
 129 {
 130         struct omap_dss_device *in = ddata->in;
 131         return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
 132 }
 133
 134 static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
 135 {
 136         struct omap_dss_device *in = ddata->in;
 137         u8 buf[2] = { dcs_cmd, param };
 138
 139         return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
 140 }
 141
 142 static int dsicm_sleep_in(struct panel_drv_data *ddata)
 143
 144 {
 145         struct omap_dss_device *in = ddata->in;
 146         u8 cmd;
 147         int r;
 148
 149         hw_guard_wait(ddata);
 150
 151         cmd = MIPI_DCS_ENTER_SLEEP_MODE;
 152         r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
 153         if (r)
 154                 return r;
 155
 156         hw_guard_start(ddata, 120);
 157
 158         usleep_range(5000, 10000);
 159
 160         return 0;
 161 }
 162
 163 static int dsicm_sleep_out(struct panel_drv_data *ddata)
 164 {
 165         int r;
 166
 167         hw_guard_wait(ddata);
 168
 169         r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
 170         if (r)
 171                 return r;
 172
 173         hw_guard_start(ddata, 120);
 174
 175         usleep_range(5000, 10000);
 176
 177         return 0;
 178 }
 179
 180 static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
 181 {
 182         int r;
 183
 184         r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
 185         if (r)
 186                 return r;
 187         r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
 188         if (r)
 189                 return r;
 190         r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
 191         if (r)
 192                 return r;
 193
 194         return 0;
 195 }
 196
 197 static int dsicm_set_update_window(struct panel_drv_data *ddata,
 198                 u16 x, u16 y, u16 w, u16 h)
 199 {
 200         struct omap_dss_device *in = ddata->in;
 201         int r;
 202         u16 x1 = x;
 203         u16 x2 = x + w - 1;
 204         u16 y1 = y;
 205         u16 y2 = y + h - 1;
 206
 207         u8 buf[5];
 208         buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
 209         buf[1] = (x1 >> 8) & 0xff;
 210         buf[2] = (x1 >> 0) & 0xff;
 211         buf[3] = (x2 >> 8) & 0xff;
 212         buf[4] = (x2 >> 0) & 0xff;
 213
 214         r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
 215         if (r)
 216                 return r;
 217
 218         buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
 219         buf[1] = (y1 >> 8) & 0xff;
 220         buf[2] = (y1 >> 0) & 0xff;
 221         buf[3] = (y2 >> 8) & 0xff;
 222         buf[4] = (y2 >> 0) & 0xff;
 223
 224         r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
 225         if (r)
 226                 return r;
 227
 228         in->ops.dsi->bta_sync(in, ddata->channel);
 229
 230         return r;
 231 }
 232
 233 static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
 234 {
 235         if (ddata->ulps_timeout > 0)
 236                 queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
 237                                 msecs_to_jiffies(ddata->ulps_timeout));
 238 }
 239
 240 static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
 241 {
 242         cancel_delayed_work(&ddata->ulps_work);
 243 }
 244
 245 static int dsicm_enter_ulps(struct panel_drv_data *ddata)
 246 {
 247         struct omap_dss_device *in = ddata->in;
 248         int r;
 249
 250         if (ddata->ulps_enabled)
 251                 return 0;
 252
 253         dsicm_cancel_ulps_work(ddata);
 254
 255         r = _dsicm_enable_te(ddata, false);
 256         if (r)
 257                 goto err;
 258
 259         if (gpio_is_valid(ddata->ext_te_gpio))
 260                 disable_irq(gpio_to_irq(ddata->ext_te_gpio));
 261
 262         in->ops.dsi->disable(in, false, true);
 263
 264         ddata->ulps_enabled = true;
 265
 266         return 0;
 267
 268 err:
 269         dev_err(&ddata->pdev->dev, "enter ULPS failed");
 270         dsicm_panel_reset(ddata);
 271
 272         ddata->ulps_enabled = false;
 273
 274         dsicm_queue_ulps_work(ddata);
 275
 276         return r;
 277 }
 278
 279 static int dsicm_exit_ulps(struct panel_drv_data *ddata)
 280 {
 281         struct omap_dss_device *in = ddata->in;
 282         int r;
 283
 284         if (!ddata->ulps_enabled)
 285                 return 0;
 286
 287         r = in->ops.dsi->enable(in);
 288         if (r) {
 289                 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
 290                 goto err1;
 291         }
 292
 293         in->ops.dsi->enable_hs(in, ddata->channel, true);
 294
 295         r = _dsicm_enable_te(ddata, true);
 296         if (r) {
 297                 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
 298                 goto err2;
 299         }
 300
 301         if (gpio_is_valid(ddata->ext_te_gpio))
 302                 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
 303
 304         dsicm_queue_ulps_work(ddata);
 305
 306         ddata->ulps_enabled = false;
 307
 308         return 0;
 309
 310 err2:
 311         dev_err(&ddata->pdev->dev, "failed to exit ULPS");
 312
 313         r = dsicm_panel_reset(ddata);
 314         if (!r) {
 315                 if (gpio_is_valid(ddata->ext_te_gpio))
 316                         enable_irq(gpio_to_irq(ddata->ext_te_gpio));
 317                 ddata->ulps_enabled = false;
 318         }
 319 err1:
 320         dsicm_queue_ulps_work(ddata);
 321
 322         return r;
 323 }
 324
 325 static int dsicm_wake_up(struct panel_drv_data *ddata)
 326 {
 327         if (ddata->ulps_enabled)
 328                 return dsicm_exit_ulps(ddata);
 329
 330         dsicm_cancel_ulps_work(ddata);
 331         dsicm_queue_ulps_work(ddata);
 332         return 0;
 333 }
 334
 335 static int dsicm_bl_update_status(struct backlight_device *dev)
 336 {
 337         struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
 338         struct omap_dss_device *in = ddata->in;
 339         int r;
 340         int level;
 341
 342         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 343                         dev->props.power == FB_BLANK_UNBLANK)
 344                 level = dev->props.brightness;
 345         else
 346                 level = 0;
 347
 348         dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
 349
 350         mutex_lock(&ddata->lock);
 351
 352         if (ddata->enabled) {
 353                 in->ops.dsi->bus_lock(in);
 354
 355                 r = dsicm_wake_up(ddata);
 356                 if (!r)
 357                         r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
 358
 359                 in->ops.dsi->bus_unlock(in);
 360         } else {
 361                 r = 0;
 362         }
 363
 364         mutex_unlock(&ddata->lock);
 365
 366         return r;
 367 }
 368
 369 static int dsicm_bl_get_intensity(struct backlight_device *dev)
 370 {
 371         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 372                         dev->props.power == FB_BLANK_UNBLANK)
 373                 return dev->props.brightness;
 374
 375         return 0;
 376 }
 377
 378 static const struct backlight_ops dsicm_bl_ops = {
 379         .get_brightness = dsicm_bl_get_intensity,
 380         .update_status  = dsicm_bl_update_status,
 381 };
 382
 383 static void dsicm_get_resolution(struct omap_dss_device *dssdev,
 384                 u16 *xres, u16 *yres)
 385 {
 386         *xres = dssdev->panel.timings.x_res;
 387         *yres = dssdev->panel.timings.y_res;
 388 }
 389
 390 static ssize_t dsicm_num_errors_show(struct device *dev,
 391                 struct device_attribute *attr, char *buf)
 392 {
 393         struct platform_device *pdev = to_platform_device(dev);
 394         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 395         struct omap_dss_device *in = ddata->in;
 396         u8 errors = 0;
 397         int r;
 398
 399         mutex_lock(&ddata->lock);
 400
 401         if (ddata->enabled) {
 402                 in->ops.dsi->bus_lock(in);
 403
 404                 r = dsicm_wake_up(ddata);
 405                 if (!r)
 406                         r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
 407                                         &errors);
 408
 409                 in->ops.dsi->bus_unlock(in);
 410         } else {
 411                 r = -ENODEV;
 412         }
 413
 414         mutex_unlock(&ddata->lock);
 415
 416         if (r)
 417                 return r;
 418
 419         return snprintf(buf, PAGE_SIZE, "%d\n", errors);
 420 }
 421
 422 static ssize_t dsicm_hw_revision_show(struct device *dev,
 423                 struct device_attribute *attr, char *buf)
 424 {
 425         struct platform_device *pdev = to_platform_device(dev);
 426         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 427         struct omap_dss_device *in = ddata->in;
 428         u8 id1, id2, id3;
 429         int r;
 430
 431         mutex_lock(&ddata->lock);
 432
 433         if (ddata->enabled) {
 434                 in->ops.dsi->bus_lock(in);
 435
 436                 r = dsicm_wake_up(ddata);
 437                 if (!r)
 438                         r = dsicm_get_id(ddata, &id1, &id2, &id3);
 439
 440                 in->ops.dsi->bus_unlock(in);
 441         } else {
 442                 r = -ENODEV;
 443         }
 444
 445         mutex_unlock(&ddata->lock);
 446
 447         if (r)
 448                 return r;
 449
 450         return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
 451 }
 452
 453 static ssize_t dsicm_store_ulps(struct device *dev,
 454                 struct device_attribute *attr,
 455                 const char *buf, size_t count)
 456 {
 457         struct platform_device *pdev = to_platform_device(dev);
 458         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 459         struct omap_dss_device *in = ddata->in;
 460         unsigned long t;
 461         int r;
 462
 463         r = kstrtoul(buf, 0, &t);
 464         if (r)
 465                 return r;
 466
 467         mutex_lock(&ddata->lock);
 468
 469         if (ddata->enabled) {
 470                 in->ops.dsi->bus_lock(in);
 471
 472                 if (t)
 473                         r = dsicm_enter_ulps(ddata);
 474                 else
 475                         r = dsicm_wake_up(ddata);
 476
 477                 in->ops.dsi->bus_unlock(in);
 478         }
 479
 480         mutex_unlock(&ddata->lock);
 481
 482         if (r)
 483                 return r;
 484
 485         return count;
 486 }
 487
 488 static ssize_t dsicm_show_ulps(struct device *dev,
 489                 struct device_attribute *attr,
 490                 char *buf)
 491 {
 492         struct platform_device *pdev = to_platform_device(dev);
 493         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 494         unsigned t;
 495
 496         mutex_lock(&ddata->lock);
 497         t = ddata->ulps_enabled;
 498         mutex_unlock(&ddata->lock);
 499
 500         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 501 }
 502
 503 static ssize_t dsicm_store_ulps_timeout(struct device *dev,
 504                 struct device_attribute *attr,
 505                 const char *buf, size_t count)
 506 {
 507         struct platform_device *pdev = to_platform_device(dev);
 508         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 509         struct omap_dss_device *in = ddata->in;
 510         unsigned long t;
 511         int r;
 512
 513         r = kstrtoul(buf, 0, &t);
 514         if (r)
 515                 return r;
 516
 517         mutex_lock(&ddata->lock);
 518         ddata->ulps_timeout = t;
 519
 520         if (ddata->enabled) {
 521                 /* dsicm_wake_up will restart the timer */
 522                 in->ops.dsi->bus_lock(in);
 523                 r = dsicm_wake_up(ddata);
 524                 in->ops.dsi->bus_unlock(in);
 525         }
 526
 527         mutex_unlock(&ddata->lock);
 528
 529         if (r)
 530                 return r;
 531
 532         return count;
 533 }
 534
 535 static ssize_t dsicm_show_ulps_timeout(struct device *dev,
 536                 struct device_attribute *attr,
 537                 char *buf)
 538 {
 539         struct platform_device *pdev = to_platform_device(dev);
 540         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 541         unsigned t;
 542
 543         mutex_lock(&ddata->lock);
 544         t = ddata->ulps_timeout;
 545         mutex_unlock(&ddata->lock);
 546
 547         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 548 }
 549
 550 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
 551 static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
 552 static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
 553                 dsicm_show_ulps, dsicm_store_ulps);
 554 static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
 555                 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
 556
 557 static struct attribute *dsicm_attrs[] = {
 558         &dev_attr_num_dsi_errors.attr,
 559         &dev_attr_hw_revision.attr,
 560         &dev_attr_ulps.attr,
 561         &dev_attr_ulps_timeout.attr,
 562         NULL,
 563 };
 564
 565 static struct attribute_group dsicm_attr_group = {
 566         .attrs = dsicm_attrs,
 567 };
 568
 569 static void dsicm_hw_reset(struct panel_drv_data *ddata)
 570 {
 571         if (!gpio_is_valid(ddata->reset_gpio))
 572                 return;
 573
 574         gpio_set_value(ddata->reset_gpio, 1);
 575         udelay(10);
 576         /* reset the panel */
 577         gpio_set_value(ddata->reset_gpio, 0);
 578         /* assert reset */
 579         udelay(10);
 580         gpio_set_value(ddata->reset_gpio, 1);
 581         /* wait after releasing reset */
 582         usleep_range(5000, 10000);
 583 }
 584
 585 static int dsicm_power_on(struct panel_drv_data *ddata)
 586 {
 587         struct omap_dss_device *in = ddata->in;
 588         u8 id1, id2, id3;
 589         int r;
 590         struct omap_dss_dsi_config dsi_config = {
 591                 .mode = OMAP_DSS_DSI_CMD_MODE,
 592                 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
 593                 .timings = &ddata->timings,
 594                 .hs_clk_min = 150000000,
 595                 .hs_clk_max = 300000000,
 596                 .lp_clk_min = 7000000,
 597                 .lp_clk_max = 10000000,
 598         };
 599
 600         if (ddata->pin_config.num_pins > 0) {
 601                 r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
 602                 if (r) {
 603                         dev_err(&ddata->pdev->dev,
 604                                 "failed to configure DSI pins\n");
 605                         goto err0;
 606                 }
 607         }
 608
 609         r = in->ops.dsi->set_config(in, &dsi_config);
 610         if (r) {
 611                 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
 612                 goto err0;
 613         }
 614
 615         r = in->ops.dsi->enable(in);
 616         if (r) {
 617                 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
 618                 goto err0;
 619         }
 620
 621         dsicm_hw_reset(ddata);
 622
 623         in->ops.dsi->enable_hs(in, ddata->channel, false);
 624
 625         r = dsicm_sleep_out(ddata);
 626         if (r)
 627                 goto err;
 628
 629         r = dsicm_get_id(ddata, &id1, &id2, &id3);
 630         if (r)
 631                 goto err;
 632
 633         r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
 634         if (r)
 635                 goto err;
 636
 637         r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
 638                         (1<<2) | (1<<5));       /* BL | BCTRL */
 639         if (r)
 640                 goto err;
 641
 642         r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
 643                 MIPI_DCS_PIXEL_FMT_24BIT);
 644         if (r)
 645                 goto err;
 646
 647         r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
 648         if (r)
 649                 goto err;
 650
 651         r = _dsicm_enable_te(ddata, ddata->te_enabled);
 652         if (r)
 653                 goto err;
 654
 655         r = in->ops.dsi->enable_video_output(in, ddata->channel);
 656         if (r)
 657                 goto err;
 658
 659         ddata->enabled = 1;
 660
 661         if (!ddata->intro_printed) {
 662                 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
 663                         id1, id2, id3);
 664                 ddata->intro_printed = true;
 665         }
 666
 667         in->ops.dsi->enable_hs(in, ddata->channel, true);
 668
 669         return 0;
 670 err:
 671         dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
 672
 673         dsicm_hw_reset(ddata);
 674
 675         in->ops.dsi->disable(in, true, false);
 676 err0:
 677         return r;
 678 }
 679
 680 static void dsicm_power_off(struct panel_drv_data *ddata)
 681 {
 682         struct omap_dss_device *in = ddata->in;
 683         int r;
 684
 685         in->ops.dsi->disable_video_output(in, ddata->channel);
 686
 687         r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
 688         if (!r)
 689                 r = dsicm_sleep_in(ddata);
 690
 691         if (r) {
 692                 dev_err(&ddata->pdev->dev,
 693                                 "error disabling panel, issuing HW reset\n");
 694                 dsicm_hw_reset(ddata);
 695         }
 696
 697         in->ops.dsi->disable(in, true, false);
 698
 699         ddata->enabled = 0;
 700 }
 701
 702 static int dsicm_panel_reset(struct panel_drv_data *ddata)
 703 {
 704         dev_err(&ddata->pdev->dev, "performing LCD reset\n");
 705
 706         dsicm_power_off(ddata);
 707         dsicm_hw_reset(ddata);
 708         return dsicm_power_on(ddata);
 709 }
 710
 711 static int dsicm_connect(struct omap_dss_device *dssdev)
 712 {
 713         struct panel_drv_data *ddata = to_panel_data(dssdev);
 714         struct omap_dss_device *in = ddata->in;
 715         struct device *dev = &ddata->pdev->dev;
 716         int r;
 717
 718         if (omapdss_device_is_connected(dssdev))
 719                 return 0;
 720
 721         r = in->ops.dsi->connect(in, dssdev);
 722         if (r) {
 723                 dev_err(dev, "Failed to connect to video source\n");
 724                 return r;
 725         }
 726
 727         r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
 728         if (r) {
 729                 dev_err(dev, "failed to get virtual channel\n");
 730                 goto err_req_vc;
 731         }
 732
 733         r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
 734         if (r) {
 735                 dev_err(dev, "failed to set VC_ID\n");
 736                 goto err_vc_id;
 737         }
 738
 739         return 0;
 740
 741 err_vc_id:
 742         in->ops.dsi->release_vc(ddata->in, ddata->channel);
 743 err_req_vc:
 744         in->ops.dsi->disconnect(in, dssdev);
 745         return r;
 746 }
 747
 748 static void dsicm_disconnect(struct omap_dss_device *dssdev)
 749 {
 750         struct panel_drv_data *ddata = to_panel_data(dssdev);
 751         struct omap_dss_device *in = ddata->in;
 752
 753         if (!omapdss_device_is_connected(dssdev))
 754                 return;
 755
 756         in->ops.dsi->release_vc(in, ddata->channel);
 757         in->ops.dsi->disconnect(in, dssdev);
 758 }
 759
 760 static int dsicm_enable(struct omap_dss_device *dssdev)
 761 {
 762         struct panel_drv_data *ddata = to_panel_data(dssdev);
 763         struct omap_dss_device *in = ddata->in;
 764         int r;
 765
 766         dev_dbg(&ddata->pdev->dev, "enable\n");
 767
 768         mutex_lock(&ddata->lock);
 769
 770         if (!omapdss_device_is_connected(dssdev)) {
 771                 r = -ENODEV;
 772                 goto err;
 773         }
 774
 775         if (omapdss_device_is_enabled(dssdev)) {
 776                 r = 0;
 777                 goto err;
 778         }
 779
 780         in->ops.dsi->bus_lock(in);
 781
 782         r = dsicm_power_on(ddata);
 783
 784         in->ops.dsi->bus_unlock(in);
 785
 786         if (r)
 787                 goto err;
 788
 789         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 790
 791         mutex_unlock(&ddata->lock);
 792
 793         return 0;
 794 err:
 795         dev_dbg(&ddata->pdev->dev, "enable failed\n");
 796         mutex_unlock(&ddata->lock);
 797         return r;
 798 }
 799
 800 static void dsicm_disable(struct omap_dss_device *dssdev)
 801 {
 802         struct panel_drv_data *ddata = to_panel_data(dssdev);
 803         struct omap_dss_device *in = ddata->in;
 804         int r;
 805
 806         dev_dbg(&ddata->pdev->dev, "disable\n");
 807
 808         mutex_lock(&ddata->lock);
 809
 810         dsicm_cancel_ulps_work(ddata);
 811
 812         in->ops.dsi->bus_lock(in);
 813
 814         if (omapdss_device_is_enabled(dssdev)) {
 815                 r = dsicm_wake_up(ddata);
 816                 if (!r)
 817                         dsicm_power_off(ddata);
 818         }
 819
 820         in->ops.dsi->bus_unlock(in);
 821
 822         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 823
 824         mutex_unlock(&ddata->lock);
 825 }
 826
 827 static void dsicm_framedone_cb(int err, void *data)
 828 {
 829         struct panel_drv_data *ddata = data;
 830         struct omap_dss_device *in = ddata->in;
 831
 832         dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
 833         in->ops.dsi->bus_unlock(ddata->in);
 834 }
 835
 836 static irqreturn_t dsicm_te_isr(int irq, void *data)
 837 {
 838         struct panel_drv_data *ddata = data;
 839         struct omap_dss_device *in = ddata->in;
 840         int old;
 841         int r;
 842
 843         old = atomic_cmpxchg(&ddata->do_update, 1, 0);
 844
 845         if (old) {
 846                 cancel_delayed_work(&ddata->te_timeout_work);
 847
 848                 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
 849                                 ddata);
 850                 if (r)
 851                         goto err;
 852         }
 853
 854         return IRQ_HANDLED;
 855 err:
 856         dev_err(&ddata->pdev->dev, "start update failed\n");
 857         in->ops.dsi->bus_unlock(in);
 858         return IRQ_HANDLED;
 859 }
 860
 861 static void dsicm_te_timeout_work_callback(struct work_struct *work)
 862 {
 863         struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
 864                                         te_timeout_work.work);
 865         struct omap_dss_device *in = ddata->in;
 866
 867         dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
 868
 869         atomic_set(&ddata->do_update, 0);
 870         in->ops.dsi->bus_unlock(in);
 871 }
 872
 873 static int dsicm_update(struct omap_dss_device *dssdev,
 874                                     u16 x, u16 y, u16 w, u16 h)
 875 {
 876         struct panel_drv_data *ddata = to_panel_data(dssdev);
 877         struct omap_dss_device *in = ddata->in;
 878         int r;
 879
 880         dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
 881
 882         mutex_lock(&ddata->lock);
 883         in->ops.dsi->bus_lock(in);
 884
 885         r = dsicm_wake_up(ddata);
 886         if (r)
 887                 goto err;
 888
 889         if (!ddata->enabled) {
 890                 r = 0;
 891                 goto err;
 892         }
 893
 894         /* XXX no need to send this every frame, but dsi break if not done */
 895         r = dsicm_set_update_window(ddata, 0, 0,
 896                         dssdev->panel.timings.x_res,
 897                         dssdev->panel.timings.y_res);
 898         if (r)
 899                 goto err;
 900
 901         if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
 902                 schedule_delayed_work(&ddata->te_timeout_work,
 903                                 msecs_to_jiffies(250));
 904                 atomic_set(&ddata->do_update, 1);
 905         } else {
 906                 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
 907                                 ddata);
 908                 if (r)
 909                         goto err;
 910         }
 911
 912         /* note: no bus_unlock here. unlock is in framedone_cb */
 913         mutex_unlock(&ddata->lock);
 914         return 0;
 915 err:
 916         in->ops.dsi->bus_unlock(in);
 917         mutex_unlock(&ddata->lock);
 918         return r;
 919 }
 920
 921 static int dsicm_sync(struct omap_dss_device *dssdev)
 922 {
 923         struct panel_drv_data *ddata = to_panel_data(dssdev);
 924         struct omap_dss_device *in = ddata->in;
 925
 926         dev_dbg(&ddata->pdev->dev, "sync\n");
 927
 928         mutex_lock(&ddata->lock);
 929         in->ops.dsi->bus_lock(in);
 930         in->ops.dsi->bus_unlock(in);
 931         mutex_unlock(&ddata->lock);
 932
 933         dev_dbg(&ddata->pdev->dev, "sync done\n");
 934
 935         return 0;
 936 }
 937
 938 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
 939 {
 940         struct omap_dss_device *in = ddata->in;
 941         int r;
 942
 943         if (enable)
 944                 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
 945         else
 946                 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
 947
 948         if (!gpio_is_valid(ddata->ext_te_gpio))
 949                 in->ops.dsi->enable_te(in, enable);
 950
 951         /* possible panel bug */
 952         msleep(100);
 953
 954         return r;
 955 }
 956
 957 static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
 958 {
 959         struct panel_drv_data *ddata = to_panel_data(dssdev);
 960         struct omap_dss_device *in = ddata->in;
 961         int r;
 962
 963         mutex_lock(&ddata->lock);
 964
 965         if (ddata->te_enabled == enable)
 966                 goto end;
 967
 968         in->ops.dsi->bus_lock(in);
 969
 970         if (ddata->enabled) {
 971                 r = dsicm_wake_up(ddata);
 972                 if (r)
 973                         goto err;
 974
 975                 r = _dsicm_enable_te(ddata, enable);
 976                 if (r)
 977                         goto err;
 978         }
 979
 980         ddata->te_enabled = enable;
 981
 982         in->ops.dsi->bus_unlock(in);
 983 end:
 984         mutex_unlock(&ddata->lock);
 985
 986         return 0;
 987 err:
 988         in->ops.dsi->bus_unlock(in);
 989         mutex_unlock(&ddata->lock);
 990
 991         return r;
 992 }
 993
 994 static int dsicm_get_te(struct omap_dss_device *dssdev)
 995 {
 996         struct panel_drv_data *ddata = to_panel_data(dssdev);
 997         int r;
 998
 999         mutex_lock(&ddata->lock);
1000         r = ddata->te_enabled;
1001         mutex_unlock(&ddata->lock);
1002
1003         return r;
1004 }
1005
1006 static int dsicm_memory_read(struct omap_dss_device *dssdev,
1007                 void *buf, size_t size,
1008                 u16 x, u16 y, u16 w, u16 h)
1009 {
1010         struct panel_drv_data *ddata = to_panel_data(dssdev);
1011         struct omap_dss_device *in = ddata->in;
1012         int r;
1013         int first = 1;
1014         int plen;
1015         unsigned buf_used = 0;
1016
1017         if (size < w * h * 3)
1018                 return -ENOMEM;
1019
1020         mutex_lock(&ddata->lock);
1021
1022         if (!ddata->enabled) {
1023                 r = -ENODEV;
1024                 goto err1;
1025         }
1026
1027         size = min(w * h * 3,
1028                         dssdev->panel.timings.x_res *
1029                         dssdev->panel.timings.y_res * 3);
1030
1031         in->ops.dsi->bus_lock(in);
1032
1033         r = dsicm_wake_up(ddata);
1034         if (r)
1035                 goto err2;
1036
1037         /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1038          * use short packets. plen 32 works, but bigger packets seem to cause
1039          * an error. */
1040         if (size % 2)
1041                 plen = 1;
1042         else
1043                 plen = 2;
1044
1045         dsicm_set_update_window(ddata, x, y, w, h);
1046
1047         r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
1048         if (r)
1049                 goto err2;
1050
1051         while (buf_used < size) {
1052                 u8 dcs_cmd = first ? 0x2e : 0x3e;
1053                 first = 0;
1054
1055                 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
1056                                 buf + buf_used, size - buf_used);
1057
1058                 if (r < 0) {
1059                         dev_err(dssdev->dev, "read error\n");
1060                         goto err3;
1061                 }
1062
1063                 buf_used += r;
1064
1065                 if (r < plen) {
1066                         dev_err(&ddata->pdev->dev, "short read\n");
1067                         break;
1068                 }
1069
1070                 if (signal_pending(current)) {
1071                         dev_err(&ddata->pdev->dev, "signal pending, "
1072                                         "aborting memory read\n");
1073                         r = -ERESTARTSYS;
1074                         goto err3;
1075                 }
1076         }
1077
1078         r = buf_used;
1079
1080 err3:
1081         in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
1082 err2:
1083         in->ops.dsi->bus_unlock(in);
1084 err1:
1085         mutex_unlock(&ddata->lock);
1086         return r;
1087 }
1088
1089 static void dsicm_ulps_work(struct work_struct *work)
1090 {
1091         struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1092                         ulps_work.work);
1093         struct omap_dss_device *dssdev = &ddata->dssdev;
1094         struct omap_dss_device *in = ddata->in;
1095
1096         mutex_lock(&ddata->lock);
1097
1098         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1099                 mutex_unlock(&ddata->lock);
1100                 return;
1101         }
1102
1103         in->ops.dsi->bus_lock(in);
1104
1105         dsicm_enter_ulps(ddata);
1106
1107         in->ops.dsi->bus_unlock(in);
1108         mutex_unlock(&ddata->lock);
1109 }
1110
1111 static struct omap_dss_driver dsicm_ops = {
1112         .connect        = dsicm_connect,
1113         .disconnect     = dsicm_disconnect,
1114
1115         .enable         = dsicm_enable,
1116         .disable        = dsicm_disable,
1117
1118         .update         = dsicm_update,
1119         .sync           = dsicm_sync,
1120
1121         .get_resolution = dsicm_get_resolution,
1122         .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1123
1124         .enable_te      = dsicm_enable_te,
1125         .get_te         = dsicm_get_te,
1126
1127         .memory_read    = dsicm_memory_read,
1128 };
1129
1130 static int dsicm_probe_pdata(struct platform_device *pdev)
1131 {
1132         const struct panel_dsicm_platform_data *pdata;
1133         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1134         struct omap_dss_device *dssdev, *in;
1135
1136         pdata = dev_get_platdata(&pdev->dev);
1137
1138         in = omap_dss_find_output(pdata->source);
1139         if (in == NULL) {
1140                 dev_err(&pdev->dev, "failed to find video source\n");
1141                 return -EPROBE_DEFER;
1142         }
1143         ddata->in = in;
1144
1145         ddata->reset_gpio = pdata->reset_gpio;
1146
1147         if (pdata->use_ext_te)
1148                 ddata->ext_te_gpio = pdata->ext_te_gpio;
1149         else
1150                 ddata->ext_te_gpio = -1;
1151
1152         ddata->ulps_timeout = pdata->ulps_timeout;
1153
1154         ddata->use_dsi_backlight = pdata->use_dsi_backlight;
1155
1156         ddata->pin_config = pdata->pin_config;
1157
1158         dssdev = &ddata->dssdev;
1159         dssdev->name = pdata->name;
1160
1161         return 0;
1162 }
1163
1164 static int dsicm_probe_of(struct platform_device *pdev)
1165 {
1166         struct device_node *node = pdev->dev.of_node;
1167         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1168         struct omap_dss_device *in;
1169         int gpio;
1170
1171         gpio = of_get_named_gpio(node, "reset-gpios", 0);
1172         if (!gpio_is_valid(gpio)) {
1173                 dev_err(&pdev->dev, "failed to parse reset gpio\n");
1174                 return gpio;
1175         }
1176         ddata->reset_gpio = gpio;
1177
1178         gpio = of_get_named_gpio(node, "te-gpios", 0);
1179         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
1180                 ddata->ext_te_gpio = gpio;
1181         } else {
1182                 dev_err(&pdev->dev, "failed to parse TE gpio\n");
1183                 return gpio;
1184         }
1185
1186         in = omapdss_of_find_source_for_first_ep(node);
1187         if (IS_ERR(in)) {
1188                 dev_err(&pdev->dev, "failed to find video source\n");
1189                 return PTR_ERR(in);
1190         }
1191
1192         ddata->in = in;
1193
1194         /* TODO: ulps, backlight */
1195
1196         return 0;
1197 }
1198
1199 static int dsicm_probe(struct platform_device *pdev)
1200 {
1201         struct backlight_properties props;
1202         struct panel_drv_data *ddata;
1203         struct backlight_device *bldev = NULL;
1204         struct device *dev = &pdev->dev;
1205         struct omap_dss_device *dssdev;
1206         int r;
1207
1208         dev_dbg(dev, "probe\n");
1209
1210         ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1211         if (!ddata)
1212                 return -ENOMEM;
1213
1214         platform_set_drvdata(pdev, ddata);
1215         ddata->pdev = pdev;
1216
1217         if (dev_get_platdata(dev)) {
1218                 r = dsicm_probe_pdata(pdev);
1219                 if (r)
1220                         return r;
1221         } else if (pdev->dev.of_node) {
1222                 r = dsicm_probe_of(pdev);
1223                 if (r)
1224                         return r;
1225         } else {
1226                 return -ENODEV;
1227         }
1228
1229         ddata->timings.x_res = 864;
1230         ddata->timings.y_res = 480;
1231         ddata->timings.pixelclock = 864 * 480 * 60;
1232
1233         dssdev = &ddata->dssdev;
1234         dssdev->dev = dev;
1235         dssdev->driver = &dsicm_ops;
1236         dssdev->panel.timings = ddata->timings;
1237         dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1238         dssdev->owner = THIS_MODULE;
1239
1240         dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
1241         dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
1242                 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
1243
1244         r = omapdss_register_display(dssdev);
1245         if (r) {
1246                 dev_err(dev, "Failed to register panel\n");
1247                 goto err_reg;
1248         }
1249
1250         mutex_init(&ddata->lock);
1251
1252         atomic_set(&ddata->do_update, 0);
1253
1254         if (gpio_is_valid(ddata->reset_gpio)) {
1255                 r = devm_gpio_request_one(dev, ddata->reset_gpio,
1256                                 GPIOF_OUT_INIT_LOW, "taal rst");
1257                 if (r) {
1258                         dev_err(dev, "failed to request reset gpio\n");
1259                         return r;
1260                 }
1261         }
1262
1263         if (gpio_is_valid(ddata->ext_te_gpio)) {
1264                 r = devm_gpio_request_one(dev, ddata->ext_te_gpio,
1265                                 GPIOF_IN, "taal irq");
1266                 if (r) {
1267                         dev_err(dev, "GPIO request failed\n");
1268                         return r;
1269                 }
1270
1271                 r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
1272                                 dsicm_te_isr,
1273                                 IRQF_TRIGGER_RISING,
1274                                 "taal vsync", ddata);
1275
1276                 if (r) {
1277                         dev_err(dev, "IRQ request failed\n");
1278                         return r;
1279                 }
1280
1281                 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1282                                         dsicm_te_timeout_work_callback);
1283
1284                 dev_dbg(dev, "Using GPIO TE\n");
1285         }
1286
1287         ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
1288         if (ddata->workqueue == NULL) {
1289                 dev_err(dev, "can't create workqueue\n");
1290                 return -ENOMEM;
1291         }
1292         INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1293
1294         dsicm_hw_reset(ddata);
1295
1296         if (ddata->use_dsi_backlight) {
1297                 memset(&props, 0, sizeof(struct backlight_properties));
1298                 props.max_brightness = 255;
1299
1300                 props.type = BACKLIGHT_RAW;
1301                 bldev = backlight_device_register(dev_name(dev),
1302                                 dev, ddata, &dsicm_bl_ops, &props);
1303                 if (IS_ERR(bldev)) {
1304                         r = PTR_ERR(bldev);
1305                         goto err_bl;
1306                 }
1307
1308                 ddata->bldev = bldev;
1309
1310                 bldev->props.fb_blank = FB_BLANK_UNBLANK;
1311                 bldev->props.power = FB_BLANK_UNBLANK;
1312                 bldev->props.brightness = 255;
1313
1314                 dsicm_bl_update_status(bldev);
1315         }
1316
1317         r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1318         if (r) {
1319                 dev_err(dev, "failed to create sysfs files\n");
1320                 goto err_sysfs_create;
1321         }
1322
1323         return 0;
1324
1325 err_sysfs_create:
1326         if (bldev != NULL)
1327                 backlight_device_unregister(bldev);
1328 err_bl:
1329         destroy_workqueue(ddata->workqueue);
1330 err_reg:
1331         return r;
1332 }
1333
1334 static int __exit dsicm_remove(struct platform_device *pdev)
1335 {
1336         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1337         struct omap_dss_device *dssdev = &ddata->dssdev;
1338         struct backlight_device *bldev;
1339
1340         dev_dbg(&pdev->dev, "remove\n");
1341
1342         omapdss_unregister_display(dssdev);
1343
1344         dsicm_disable(dssdev);
1345         dsicm_disconnect(dssdev);
1346
1347         sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1348
1349         bldev = ddata->bldev;
1350         if (bldev != NULL) {
1351                 bldev->props.power = FB_BLANK_POWERDOWN;
1352                 dsicm_bl_update_status(bldev);
1353                 backlight_device_unregister(bldev);
1354         }
1355
1356         omap_dss_put_device(ddata->in);
1357
1358         dsicm_cancel_ulps_work(ddata);
1359         destroy_workqueue(ddata->workqueue);
1360
1361         /* reset, to be sure that the panel is in a valid state */
1362         dsicm_hw_reset(ddata);
1363
1364         return 0;
1365 }
1366
1367 static const struct of_device_id dsicm_of_match[] = {
1368         { .compatible = "omapdss,panel-dsi-cm", },
1369         {},
1370 };
1371
1372 MODULE_DEVICE_TABLE(of, dsicm_of_match);
1373
1374 static struct platform_driver dsicm_driver = {
1375         .probe = dsicm_probe,
1376         .remove = __exit_p(dsicm_remove),
1377         .driver = {
1378                 .name = "panel-dsi-cm",
1379                 .of_match_table = dsicm_of_match,
1380                 .suppress_bind_attrs = true,
1381         },
1382 };
1383
1384 module_platform_driver(dsicm_driver);
1385
1386 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1387 MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1388 MODULE_LICENSE("GPL");