drivers/video/omap2/displays/panel-taal.c

   1 /*
   2  * Taal DSI command mode panel
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.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 DEBUG*/
  21
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/err.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/sched.h>
  27 #include <linux/backlight.h>
  28 #include <linux/fb.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/gpio.h>
  31 #include <linux/completion.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/slab.h>
  34 #include <linux/mutex.h>
  35
  36 #include <plat/display.h>
  37
  38 /* DSI Virtual channel. Hardcoded for now. */
  39 #define TCH 0
  40
  41 #define DCS_READ_NUM_ERRORS     0x05
  42 #define DCS_READ_POWER_MODE     0x0a
  43 #define DCS_READ_MADCTL         0x0b
  44 #define DCS_READ_PIXEL_FORMAT   0x0c
  45 #define DCS_RDDSDR              0x0f
  46 #define DCS_SLEEP_IN            0x10
  47 #define DCS_SLEEP_OUT           0x11
  48 #define DCS_DISPLAY_OFF         0x28
  49 #define DCS_DISPLAY_ON          0x29
  50 #define DCS_COLUMN_ADDR         0x2a
  51 #define DCS_PAGE_ADDR           0x2b
  52 #define DCS_MEMORY_WRITE        0x2c
  53 #define DCS_TEAR_OFF            0x34
  54 #define DCS_TEAR_ON             0x35
  55 #define DCS_MEM_ACC_CTRL        0x36
  56 #define DCS_PIXEL_FORMAT        0x3a
  57 #define DCS_BRIGHTNESS          0x51
  58 #define DCS_CTRL_DISPLAY        0x53
  59 #define DCS_WRITE_CABC          0x55
  60 #define DCS_READ_CABC           0x56
  61 #define DCS_GET_ID1             0xda
  62 #define DCS_GET_ID2             0xdb
  63 #define DCS_GET_ID3             0xdc
  64
  65 /* #define TAAL_USE_ESD_CHECK */
  66 #define TAAL_ESD_CHECK_PERIOD   msecs_to_jiffies(5000)
  67
  68 static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable);
  69
  70 struct taal_data {
  71         struct mutex lock;
  72
  73         struct backlight_device *bldev;
  74
  75         unsigned long   hw_guard_end;   /* next value of jiffies when we can
  76                                          * issue the next sleep in/out command
  77                                          */
  78         unsigned long   hw_guard_wait;  /* max guard time in jiffies */
  79
  80         struct omap_dss_device *dssdev;
  81
  82         bool enabled;
  83         u8 rotate;
  84         bool mirror;
  85
  86         bool te_enabled;
  87         bool use_ext_te;
  88         struct completion te_completion;
  89
  90         bool use_dsi_bl;
  91
  92         bool cabc_broken;
  93         unsigned cabc_mode;
  94
  95         bool intro_printed;
  96
  97         struct workqueue_struct *esd_wq;
  98         struct delayed_work esd_work;
  99 };
 100
 101 static void taal_esd_work(struct work_struct *work);
 102
 103 static void hw_guard_start(struct taal_data *td, int guard_msec)
 104 {
 105         td->hw_guard_wait = msecs_to_jiffies(guard_msec);
 106         td->hw_guard_end = jiffies + td->hw_guard_wait;
 107 }
 108
 109 static void hw_guard_wait(struct taal_data *td)
 110 {
 111         unsigned long wait = td->hw_guard_end - jiffies;
 112
 113         if ((long)wait > 0 && wait <= td->hw_guard_wait) {
 114                 set_current_state(TASK_UNINTERRUPTIBLE);
 115                 schedule_timeout(wait);
 116         }
 117 }
 118
 119 static int taal_dcs_read_1(u8 dcs_cmd, u8 *data)
 120 {
 121         int r;
 122         u8 buf[1];
 123
 124         r = dsi_vc_dcs_read(TCH, dcs_cmd, buf, 1);
 125
 126         if (r < 0)
 127                 return r;
 128
 129         *data = buf[0];
 130
 131         return 0;
 132 }
 133
 134 static int taal_dcs_write_0(u8 dcs_cmd)
 135 {
 136         return dsi_vc_dcs_write(TCH, &dcs_cmd, 1);
 137 }
 138
 139 static int taal_dcs_write_1(u8 dcs_cmd, u8 param)
 140 {
 141         u8 buf[2];
 142         buf[0] = dcs_cmd;
 143         buf[1] = param;
 144         return dsi_vc_dcs_write(TCH, buf, 2);
 145 }
 146
 147 static int taal_sleep_in(struct taal_data *td)
 148
 149 {
 150         u8 cmd;
 151         int r;
 152
 153         hw_guard_wait(td);
 154
 155         cmd = DCS_SLEEP_IN;
 156         r = dsi_vc_dcs_write_nosync(TCH, &cmd, 1);
 157         if (r)
 158                 return r;
 159
 160         hw_guard_start(td, 120);
 161
 162         msleep(5);
 163
 164         return 0;
 165 }
 166
 167 static int taal_sleep_out(struct taal_data *td)
 168 {
 169         int r;
 170
 171         hw_guard_wait(td);
 172
 173         r = taal_dcs_write_0(DCS_SLEEP_OUT);
 174         if (r)
 175                 return r;
 176
 177         hw_guard_start(td, 120);
 178
 179         msleep(5);
 180
 181         return 0;
 182 }
 183
 184 static int taal_get_id(u8 *id1, u8 *id2, u8 *id3)
 185 {
 186         int r;
 187
 188         r = taal_dcs_read_1(DCS_GET_ID1, id1);
 189         if (r)
 190                 return r;
 191         r = taal_dcs_read_1(DCS_GET_ID2, id2);
 192         if (r)
 193                 return r;
 194         r = taal_dcs_read_1(DCS_GET_ID3, id3);
 195         if (r)
 196                 return r;
 197
 198         return 0;
 199 }
 200
 201 static int taal_set_addr_mode(u8 rotate, bool mirror)
 202 {
 203         int r;
 204         u8 mode;
 205         int b5, b6, b7;
 206
 207         r = taal_dcs_read_1(DCS_READ_MADCTL, &mode);
 208         if (r)
 209                 return r;
 210
 211         switch (rotate) {
 212         default:
 213         case 0:
 214                 b7 = 0;
 215                 b6 = 0;
 216                 b5 = 0;
 217                 break;
 218         case 1:
 219                 b7 = 0;
 220                 b6 = 1;
 221                 b5 = 1;
 222                 break;
 223         case 2:
 224                 b7 = 1;
 225                 b6 = 1;
 226                 b5 = 0;
 227                 break;
 228         case 3:
 229                 b7 = 1;
 230                 b6 = 0;
 231                 b5 = 1;
 232                 break;
 233         }
 234
 235         if (mirror)
 236                 b6 = !b6;
 237
 238         mode &= ~((1<<7) | (1<<6) | (1<<5));
 239         mode |= (b7 << 7) | (b6 << 6) | (b5 << 5);
 240
 241         return taal_dcs_write_1(DCS_MEM_ACC_CTRL, mode);
 242 }
 243
 244 static int taal_set_update_window(u16 x, u16 y, u16 w, u16 h)
 245 {
 246         int r;
 247         u16 x1 = x;
 248         u16 x2 = x + w - 1;
 249         u16 y1 = y;
 250         u16 y2 = y + h - 1;
 251
 252         u8 buf[5];
 253         buf[0] = DCS_COLUMN_ADDR;
 254         buf[1] = (x1 >> 8) & 0xff;
 255         buf[2] = (x1 >> 0) & 0xff;
 256         buf[3] = (x2 >> 8) & 0xff;
 257         buf[4] = (x2 >> 0) & 0xff;
 258
 259         r = dsi_vc_dcs_write_nosync(TCH, buf, sizeof(buf));
 260         if (r)
 261                 return r;
 262
 263         buf[0] = DCS_PAGE_ADDR;
 264         buf[1] = (y1 >> 8) & 0xff;
 265         buf[2] = (y1 >> 0) & 0xff;
 266         buf[3] = (y2 >> 8) & 0xff;
 267         buf[4] = (y2 >> 0) & 0xff;
 268
 269         r = dsi_vc_dcs_write_nosync(TCH, buf, sizeof(buf));
 270         if (r)
 271                 return r;
 272
 273         dsi_vc_send_bta_sync(TCH);
 274
 275         return r;
 276 }
 277
 278 static int taal_bl_update_status(struct backlight_device *dev)
 279 {
 280         struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev);
 281         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 282         int r;
 283         int level;
 284
 285         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 286                         dev->props.power == FB_BLANK_UNBLANK)
 287                 level = dev->props.brightness;
 288         else
 289                 level = 0;
 290
 291         dev_dbg(&dssdev->dev, "update brightness to %d\n", level);
 292
 293         mutex_lock(&td->lock);
 294
 295         if (td->use_dsi_bl) {
 296                 if (td->enabled) {
 297                         dsi_bus_lock();
 298                         r = taal_dcs_write_1(DCS_BRIGHTNESS, level);
 299                         dsi_bus_unlock();
 300                 } else {
 301                         r = 0;
 302                 }
 303         } else {
 304                 if (!dssdev->set_backlight)
 305                         r = -EINVAL;
 306                 else
 307                         r = dssdev->set_backlight(dssdev, level);
 308         }
 309
 310         mutex_unlock(&td->lock);
 311
 312         return r;
 313 }
 314
 315 static int taal_bl_get_intensity(struct backlight_device *dev)
 316 {
 317         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 318                         dev->props.power == FB_BLANK_UNBLANK)
 319                 return dev->props.brightness;
 320
 321         return 0;
 322 }
 323
 324 static struct backlight_ops taal_bl_ops = {
 325         .get_brightness = taal_bl_get_intensity,
 326         .update_status  = taal_bl_update_status,
 327 };
 328
 329 static void taal_get_timings(struct omap_dss_device *dssdev,
 330                         struct omap_video_timings *timings)
 331 {
 332         *timings = dssdev->panel.timings;
 333 }
 334
 335 static void taal_get_resolution(struct omap_dss_device *dssdev,
 336                 u16 *xres, u16 *yres)
 337 {
 338         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 339
 340         if (td->rotate == 0 || td->rotate == 2) {
 341                 *xres = dssdev->panel.timings.x_res;
 342                 *yres = dssdev->panel.timings.y_res;
 343         } else {
 344                 *yres = dssdev->panel.timings.x_res;
 345                 *xres = dssdev->panel.timings.y_res;
 346         }
 347 }
 348
 349 static irqreturn_t taal_te_isr(int irq, void *data)
 350 {
 351         struct omap_dss_device *dssdev = data;
 352         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 353
 354         complete_all(&td->te_completion);
 355
 356         return IRQ_HANDLED;
 357 }
 358
 359 static ssize_t taal_num_errors_show(struct device *dev,
 360                 struct device_attribute *attr, char *buf)
 361 {
 362         struct omap_dss_device *dssdev = to_dss_device(dev);
 363         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 364         u8 errors;
 365         int r;
 366
 367         mutex_lock(&td->lock);
 368
 369         if (td->enabled) {
 370                 dsi_bus_lock();
 371                 r = taal_dcs_read_1(DCS_READ_NUM_ERRORS, &errors);
 372                 dsi_bus_unlock();
 373         } else {
 374                 r = -ENODEV;
 375         }
 376
 377         mutex_unlock(&td->lock);
 378
 379         if (r)
 380                 return r;
 381
 382         return snprintf(buf, PAGE_SIZE, "%d\n", errors);
 383 }
 384
 385 static ssize_t taal_hw_revision_show(struct device *dev,
 386                 struct device_attribute *attr, char *buf)
 387 {
 388         struct omap_dss_device *dssdev = to_dss_device(dev);
 389         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 390         u8 id1, id2, id3;
 391         int r;
 392
 393         mutex_lock(&td->lock);
 394
 395         if (td->enabled) {
 396                 dsi_bus_lock();
 397                 r = taal_get_id(&id1, &id2, &id3);
 398                 dsi_bus_unlock();
 399         } else {
 400                 r = -ENODEV;
 401         }
 402
 403         mutex_unlock(&td->lock);
 404
 405         if (r)
 406                 return r;
 407
 408         return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
 409 }
 410
 411 static const char *cabc_modes[] = {
 412         "off",          /* used also always when CABC is not supported */
 413         "ui",
 414         "still-image",
 415         "moving-image",
 416 };
 417
 418 static ssize_t show_cabc_mode(struct device *dev,
 419                 struct device_attribute *attr,
 420                 char *buf)
 421 {
 422         struct omap_dss_device *dssdev = to_dss_device(dev);
 423         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 424         const char *mode_str;
 425         int mode;
 426         int len;
 427
 428         mode = td->cabc_mode;
 429
 430         mode_str = "unknown";
 431         if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
 432                 mode_str = cabc_modes[mode];
 433         len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);
 434
 435         return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
 436 }
 437
 438 static ssize_t store_cabc_mode(struct device *dev,
 439                 struct device_attribute *attr,
 440                 const char *buf, size_t count)
 441 {
 442         struct omap_dss_device *dssdev = to_dss_device(dev);
 443         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 444         int i;
 445
 446         for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
 447                 if (sysfs_streq(cabc_modes[i], buf))
 448                         break;
 449         }
 450
 451         if (i == ARRAY_SIZE(cabc_modes))
 452                 return -EINVAL;
 453
 454         mutex_lock(&td->lock);
 455
 456         if (td->enabled) {
 457                 dsi_bus_lock();
 458                 if (!td->cabc_broken)
 459                         taal_dcs_write_1(DCS_WRITE_CABC, i);
 460                 dsi_bus_unlock();
 461         }
 462
 463         td->cabc_mode = i;
 464
 465         mutex_unlock(&td->lock);
 466
 467         return count;
 468 }
 469
 470 static ssize_t show_cabc_available_modes(struct device *dev,
 471                 struct device_attribute *attr,
 472                 char *buf)
 473 {
 474         int len;
 475         int i;
 476
 477         for (i = 0, len = 0;
 478              len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
 479                 len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
 480                         i ? " " : "", cabc_modes[i],
 481                         i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");
 482
 483         return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
 484 }
 485
 486 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL);
 487 static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL);
 488 static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
 489                 show_cabc_mode, store_cabc_mode);
 490 static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
 491                 show_cabc_available_modes, NULL);
 492
 493 static struct attribute *taal_attrs[] = {
 494         &dev_attr_num_dsi_errors.attr,
 495         &dev_attr_hw_revision.attr,
 496         &dev_attr_cabc_mode.attr,
 497         &dev_attr_cabc_available_modes.attr,
 498         NULL,
 499 };
 500
 501 static struct attribute_group taal_attr_group = {
 502         .attrs = taal_attrs,
 503 };
 504
 505 static void taal_hw_reset(struct omap_dss_device *dssdev)
 506 {
 507         if (dssdev->reset_gpio == -1)
 508                 return;
 509
 510         gpio_set_value(dssdev->reset_gpio, 1);
 511         udelay(10);
 512         /* reset the panel */
 513         gpio_set_value(dssdev->reset_gpio, 0);
 514         /* assert reset for at least 10us */
 515         udelay(10);
 516         gpio_set_value(dssdev->reset_gpio, 1);
 517         /* wait 5ms after releasing reset */
 518         msleep(5);
 519 }
 520
 521 static int taal_probe(struct omap_dss_device *dssdev)
 522 {
 523         struct backlight_properties props;
 524         struct taal_data *td;
 525         struct backlight_device *bldev;
 526         int r;
 527
 528         const struct omap_video_timings taal_panel_timings = {
 529                 .x_res          = 864,
 530                 .y_res          = 480,
 531         };
 532
 533         dev_dbg(&dssdev->dev, "probe\n");
 534
 535         dssdev->panel.config = OMAP_DSS_LCD_TFT;
 536         dssdev->panel.timings = taal_panel_timings;
 537         dssdev->ctrl.pixel_size = 24;
 538
 539         td = kzalloc(sizeof(*td), GFP_KERNEL);
 540         if (!td) {
 541                 r = -ENOMEM;
 542                 goto err0;
 543         }
 544         td->dssdev = dssdev;
 545
 546         mutex_init(&td->lock);
 547
 548         td->esd_wq = create_singlethread_workqueue("taal_esd");
 549         if (td->esd_wq == NULL) {
 550                 dev_err(&dssdev->dev, "can't create ESD workqueue\n");
 551                 r = -ENOMEM;
 552                 goto err1;
 553         }
 554         INIT_DELAYED_WORK_DEFERRABLE(&td->esd_work, taal_esd_work);
 555
 556         dev_set_drvdata(&dssdev->dev, td);
 557
 558         taal_hw_reset(dssdev);
 559
 560         /* if no platform set_backlight() defined, presume DSI backlight
 561          * control */
 562         memset(&props, 0, sizeof(struct backlight_properties));
 563         if (!dssdev->set_backlight)
 564                 td->use_dsi_bl = true;
 565
 566         if (td->use_dsi_bl)
 567                 props.max_brightness = 255;
 568         else
 569                 props.max_brightness = 127;
 570         bldev = backlight_device_register("taal", &dssdev->dev, dssdev,
 571                                           &taal_bl_ops, &props);
 572         if (IS_ERR(bldev)) {
 573                 r = PTR_ERR(bldev);
 574                 goto err2;
 575         }
 576
 577         td->bldev = bldev;
 578
 579         bldev->props.fb_blank = FB_BLANK_UNBLANK;
 580         bldev->props.power = FB_BLANK_UNBLANK;
 581         if (td->use_dsi_bl)
 582                 bldev->props.brightness = 255;
 583         else
 584                 bldev->props.brightness = 127;
 585
 586         taal_bl_update_status(bldev);
 587
 588         if (dssdev->phy.dsi.ext_te) {
 589                 int gpio = dssdev->phy.dsi.ext_te_gpio;
 590
 591                 r = gpio_request(gpio, "taal irq");
 592                 if (r) {
 593                         dev_err(&dssdev->dev, "GPIO request failed\n");
 594                         goto err3;
 595                 }
 596
 597                 gpio_direction_input(gpio);
 598
 599                 r = request_irq(gpio_to_irq(gpio), taal_te_isr,
 600                                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
 601                                 "taal vsync", dssdev);
 602
 603                 if (r) {
 604                         dev_err(&dssdev->dev, "IRQ request failed\n");
 605                         gpio_free(gpio);
 606                         goto err4;
 607                 }
 608
 609                 init_completion(&td->te_completion);
 610
 611                 td->use_ext_te = true;
 612         }
 613
 614         r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group);
 615         if (r) {
 616                 dev_err(&dssdev->dev, "failed to create sysfs files\n");
 617                 goto err5;
 618         }
 619
 620         return 0;
 621 err5:
 622         if (td->use_ext_te)
 623                 free_irq(gpio_to_irq(dssdev->phy.dsi.ext_te_gpio), dssdev);
 624 err4:
 625         if (td->use_ext_te)
 626                 gpio_free(dssdev->phy.dsi.ext_te_gpio);
 627 err3:
 628         backlight_device_unregister(bldev);
 629 err2:
 630         destroy_workqueue(td->esd_wq);
 631 err1:
 632         kfree(td);
 633 err0:
 634         return r;
 635 }
 636
 637 static void taal_remove(struct omap_dss_device *dssdev)
 638 {
 639         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 640         struct backlight_device *bldev;
 641
 642         dev_dbg(&dssdev->dev, "remove\n");
 643
 644         sysfs_remove_group(&dssdev->dev.kobj, &taal_attr_group);
 645
 646         if (td->use_ext_te) {
 647                 int gpio = dssdev->phy.dsi.ext_te_gpio;
 648                 free_irq(gpio_to_irq(gpio), dssdev);
 649                 gpio_free(gpio);
 650         }
 651
 652         bldev = td->bldev;
 653         bldev->props.power = FB_BLANK_POWERDOWN;
 654         taal_bl_update_status(bldev);
 655         backlight_device_unregister(bldev);
 656
 657         cancel_delayed_work_sync(&td->esd_work);
 658         destroy_workqueue(td->esd_wq);
 659
 660         /* reset, to be sure that the panel is in a valid state */
 661         taal_hw_reset(dssdev);
 662
 663         kfree(td);
 664 }
 665
 666 static int taal_power_on(struct omap_dss_device *dssdev)
 667 {
 668         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 669         u8 id1, id2, id3;
 670         int r;
 671
 672         /* it seems we have to wait a bit until taal is ready */
 673         msleep(5);
 674
 675         dsi_bus_lock();
 676
 677         r = omapdss_dsi_display_enable(dssdev);
 678         if (r) {
 679                 dev_err(&dssdev->dev, "failed to enable DSI\n");
 680                 goto err0;
 681         }
 682
 683         taal_hw_reset(dssdev);
 684
 685         omapdss_dsi_vc_enable_hs(TCH, false);
 686
 687         r = taal_sleep_out(td);
 688         if (r)
 689                 goto err;
 690
 691         r = taal_get_id(&id1, &id2, &id3);
 692         if (r)
 693                 goto err;
 694
 695         /* on early revisions CABC is broken */
 696         if (id2 == 0x00 || id2 == 0xff || id2 == 0x81)
 697                 td->cabc_broken = true;
 698
 699         r = taal_dcs_write_1(DCS_BRIGHTNESS, 0xff);
 700         if (r)
 701                 goto err;
 702
 703         r = taal_dcs_write_1(DCS_CTRL_DISPLAY,
 704                         (1<<2) | (1<<5));       /* BL | BCTRL */
 705         if (r)
 706                 goto err;
 707
 708         r = taal_dcs_write_1(DCS_PIXEL_FORMAT, 0x7); /* 24bit/pixel */
 709         if (r)
 710                 goto err;
 711
 712         r = taal_set_addr_mode(td->rotate, td->mirror);
 713         if (r)
 714                 goto err;
 715
 716         if (!td->cabc_broken) {
 717                 r = taal_dcs_write_1(DCS_WRITE_CABC, td->cabc_mode);
 718                 if (r)
 719                         goto err;
 720         }
 721
 722         r = taal_dcs_write_0(DCS_DISPLAY_ON);
 723         if (r)
 724                 goto err;
 725
 726         r = _taal_enable_te(dssdev, td->te_enabled);
 727         if (r)
 728                 goto err;
 729
 730 #ifdef TAAL_USE_ESD_CHECK
 731         queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
 732 #endif
 733
 734         td->enabled = 1;
 735
 736         if (!td->intro_printed) {
 737                 dev_info(&dssdev->dev, "revision %02x.%02x.%02x\n",
 738                                 id1, id2, id3);
 739                 if (td->cabc_broken)
 740                         dev_info(&dssdev->dev,
 741                                         "old Taal version, CABC disabled\n");
 742                 td->intro_printed = true;
 743         }
 744
 745         omapdss_dsi_vc_enable_hs(TCH, true);
 746
 747         dsi_bus_unlock();
 748
 749         return 0;
 750 err:
 751         dev_err(&dssdev->dev, "error while enabling panel, issuing HW reset\n");
 752
 753         taal_hw_reset(dssdev);
 754
 755         omapdss_dsi_display_disable(dssdev);
 756 err0:
 757         dsi_bus_unlock();
 758
 759         return r;
 760 }
 761
 762 static void taal_power_off(struct omap_dss_device *dssdev)
 763 {
 764         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 765         int r;
 766
 767         dsi_bus_lock();
 768
 769         cancel_delayed_work(&td->esd_work);
 770
 771         r = taal_dcs_write_0(DCS_DISPLAY_OFF);
 772         if (!r) {
 773                 r = taal_sleep_in(td);
 774                 /* wait a bit so that the message goes through */
 775                 msleep(10);
 776         }
 777
 778         if (r) {
 779                 dev_err(&dssdev->dev,
 780                                 "error disabling panel, issuing HW reset\n");
 781                 taal_hw_reset(dssdev);
 782         }
 783
 784         omapdss_dsi_display_disable(dssdev);
 785
 786         td->enabled = 0;
 787
 788         dsi_bus_unlock();
 789 }
 790
 791 static int taal_enable(struct omap_dss_device *dssdev)
 792 {
 793         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 794         int r;
 795
 796         dev_dbg(&dssdev->dev, "enable\n");
 797
 798         mutex_lock(&td->lock);
 799
 800         if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
 801                 r = -EINVAL;
 802                 goto err;
 803         }
 804
 805         r = taal_power_on(dssdev);
 806         if (r)
 807                 goto err;
 808
 809         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 810
 811         mutex_unlock(&td->lock);
 812
 813         return 0;
 814 err:
 815         dev_dbg(&dssdev->dev, "enable failed\n");
 816         mutex_unlock(&td->lock);
 817         return r;
 818 }
 819
 820 static void taal_disable(struct omap_dss_device *dssdev)
 821 {
 822         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 823
 824         dev_dbg(&dssdev->dev, "disable\n");
 825
 826         mutex_lock(&td->lock);
 827
 828         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 829                 taal_power_off(dssdev);
 830
 831         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 832
 833         mutex_unlock(&td->lock);
 834 }
 835
 836 static int taal_suspend(struct omap_dss_device *dssdev)
 837 {
 838         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 839         int r;
 840
 841         dev_dbg(&dssdev->dev, "suspend\n");
 842
 843         mutex_lock(&td->lock);
 844
 845         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
 846                 r = -EINVAL;
 847                 goto err;
 848         }
 849
 850         taal_power_off(dssdev);
 851         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 852
 853         mutex_unlock(&td->lock);
 854
 855         return 0;
 856 err:
 857         mutex_unlock(&td->lock);
 858         return r;
 859 }
 860
 861 static int taal_resume(struct omap_dss_device *dssdev)
 862 {
 863         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 864         int r;
 865
 866         dev_dbg(&dssdev->dev, "resume\n");
 867
 868         mutex_lock(&td->lock);
 869
 870         if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
 871                 r = -EINVAL;
 872                 goto err;
 873         }
 874
 875         r = taal_power_on(dssdev);
 876         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 877
 878         mutex_unlock(&td->lock);
 879
 880         return r;
 881 err:
 882         mutex_unlock(&td->lock);
 883         return r;
 884 }
 885
 886 static void taal_framedone_cb(int err, void *data)
 887 {
 888         struct omap_dss_device *dssdev = data;
 889         dev_dbg(&dssdev->dev, "framedone, err %d\n", err);
 890         dsi_bus_unlock();
 891 }
 892
 893 static int taal_update(struct omap_dss_device *dssdev,
 894                                     u16 x, u16 y, u16 w, u16 h)
 895 {
 896         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 897         int r;
 898
 899         dev_dbg(&dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
 900
 901         mutex_lock(&td->lock);
 902         dsi_bus_lock();
 903
 904         if (!td->enabled) {
 905                 r = 0;
 906                 goto err;
 907         }
 908
 909         r = omap_dsi_prepare_update(dssdev, &x, &y, &w, &h);
 910         if (r)
 911                 goto err;
 912
 913         r = taal_set_update_window(x, y, w, h);
 914         if (r)
 915                 goto err;
 916
 917         r = omap_dsi_update(dssdev, TCH, x, y, w, h,
 918                         taal_framedone_cb, dssdev);
 919         if (r)
 920                 goto err;
 921
 922         /* note: no bus_unlock here. unlock is in framedone_cb */
 923         mutex_unlock(&td->lock);
 924         return 0;
 925 err:
 926         dsi_bus_unlock();
 927         mutex_unlock(&td->lock);
 928         return r;
 929 }
 930
 931 static int taal_sync(struct omap_dss_device *dssdev)
 932 {
 933         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 934
 935         dev_dbg(&dssdev->dev, "sync\n");
 936
 937         mutex_lock(&td->lock);
 938         dsi_bus_lock();
 939         dsi_bus_unlock();
 940         mutex_unlock(&td->lock);
 941
 942         dev_dbg(&dssdev->dev, "sync done\n");
 943
 944         return 0;
 945 }
 946
 947 static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable)
 948 {
 949         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 950         int r;
 951
 952         td->te_enabled = enable;
 953
 954         if (enable)
 955                 r = taal_dcs_write_1(DCS_TEAR_ON, 0);
 956         else
 957                 r = taal_dcs_write_0(DCS_TEAR_OFF);
 958
 959         omapdss_dsi_enable_te(dssdev, enable);
 960
 961         /* XXX for some reason, DSI TE breaks if we don't wait here.
 962          * Panel bug? Needs more studying */
 963         msleep(100);
 964
 965         return r;
 966 }
 967
 968 static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
 969 {
 970         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 971         int r;
 972
 973         mutex_lock(&td->lock);
 974         dsi_bus_lock();
 975
 976         r = _taal_enable_te(dssdev, enable);
 977
 978         dsi_bus_unlock();
 979         mutex_unlock(&td->lock);
 980
 981         return r;
 982 }
 983
 984 static int taal_get_te(struct omap_dss_device *dssdev)
 985 {
 986         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 987         int r;
 988
 989         mutex_lock(&td->lock);
 990         r = td->te_enabled;
 991         mutex_unlock(&td->lock);
 992
 993         return r;
 994 }
 995
 996 static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
 997 {
 998         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 999         int r;
1000
1001         dev_dbg(&dssdev->dev, "rotate %d\n", rotate);
1002
1003         mutex_lock(&td->lock);
1004         dsi_bus_lock();
1005
1006         if (td->enabled) {
1007                 r = taal_set_addr_mode(rotate, td->mirror);
1008                 if (r)
1009                         goto err;
1010         }
1011
1012         td->rotate = rotate;
1013
1014         dsi_bus_unlock();
1015         mutex_unlock(&td->lock);
1016         return 0;
1017 err:
1018         dsi_bus_unlock();
1019         mutex_unlock(&td->lock);
1020         return r;
1021 }
1022
1023 static u8 taal_get_rotate(struct omap_dss_device *dssdev)
1024 {
1025         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1026         int r;
1027
1028         mutex_lock(&td->lock);
1029         r = td->rotate;
1030         mutex_unlock(&td->lock);
1031
1032         return r;
1033 }
1034
1035 static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
1036 {
1037         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1038         int r;
1039
1040         dev_dbg(&dssdev->dev, "mirror %d\n", enable);
1041
1042         mutex_lock(&td->lock);
1043         dsi_bus_lock();
1044         if (td->enabled) {
1045                 r = taal_set_addr_mode(td->rotate, enable);
1046                 if (r)
1047                         goto err;
1048         }
1049
1050         td->mirror = enable;
1051
1052         dsi_bus_unlock();
1053         mutex_unlock(&td->lock);
1054         return 0;
1055 err:
1056         dsi_bus_unlock();
1057         mutex_unlock(&td->lock);
1058         return r;
1059 }
1060
1061 static bool taal_get_mirror(struct omap_dss_device *dssdev)
1062 {
1063         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1064         int r;
1065
1066         mutex_lock(&td->lock);
1067         r = td->mirror;
1068         mutex_unlock(&td->lock);
1069
1070         return r;
1071 }
1072
1073 static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
1074 {
1075         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1076         u8 id1, id2, id3;
1077         int r;
1078
1079         mutex_lock(&td->lock);
1080         dsi_bus_lock();
1081
1082         r = taal_dcs_read_1(DCS_GET_ID1, &id1);
1083         if (r)
1084                 goto err;
1085         r = taal_dcs_read_1(DCS_GET_ID2, &id2);
1086         if (r)
1087                 goto err;
1088         r = taal_dcs_read_1(DCS_GET_ID3, &id3);
1089         if (r)
1090                 goto err;
1091
1092         dsi_bus_unlock();
1093         mutex_unlock(&td->lock);
1094         return 0;
1095 err:
1096         dsi_bus_unlock();
1097         mutex_unlock(&td->lock);
1098         return r;
1099 }
1100
1101 static int taal_memory_read(struct omap_dss_device *dssdev,
1102                 void *buf, size_t size,
1103                 u16 x, u16 y, u16 w, u16 h)
1104 {
1105         int r;
1106         int first = 1;
1107         int plen;
1108         unsigned buf_used = 0;
1109         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1110
1111         if (size < w * h * 3)
1112                 return -ENOMEM;
1113
1114         mutex_lock(&td->lock);
1115
1116         if (!td->enabled) {
1117                 r = -ENODEV;
1118                 goto err1;
1119         }
1120
1121         size = min(w * h * 3,
1122                         dssdev->panel.timings.x_res *
1123                         dssdev->panel.timings.y_res * 3);
1124
1125         dsi_bus_lock();
1126
1127         /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1128          * use short packets. plen 32 works, but bigger packets seem to cause
1129          * an error. */
1130         if (size % 2)
1131                 plen = 1;
1132         else
1133                 plen = 2;
1134
1135         taal_set_update_window(x, y, w, h);
1136
1137         r = dsi_vc_set_max_rx_packet_size(TCH, plen);
1138         if (r)
1139                 goto err2;
1140
1141         while (buf_used < size) {
1142                 u8 dcs_cmd = first ? 0x2e : 0x3e;
1143                 first = 0;
1144
1145                 r = dsi_vc_dcs_read(TCH, dcs_cmd,
1146                                 buf + buf_used, size - buf_used);
1147
1148                 if (r < 0) {
1149                         dev_err(&dssdev->dev, "read error\n");
1150                         goto err3;
1151                 }
1152
1153                 buf_used += r;
1154
1155                 if (r < plen) {
1156                         dev_err(&dssdev->dev, "short read\n");
1157                         break;
1158                 }
1159
1160                 if (signal_pending(current)) {
1161                         dev_err(&dssdev->dev, "signal pending, "
1162                                         "aborting memory read\n");
1163                         r = -ERESTARTSYS;
1164                         goto err3;
1165                 }
1166         }
1167
1168         r = buf_used;
1169
1170 err3:
1171         dsi_vc_set_max_rx_packet_size(TCH, 1);
1172 err2:
1173         dsi_bus_unlock();
1174 err1:
1175         mutex_unlock(&td->lock);
1176         return r;
1177 }
1178
1179 static void taal_esd_work(struct work_struct *work)
1180 {
1181         struct taal_data *td = container_of(work, struct taal_data,
1182                         esd_work.work);
1183         struct omap_dss_device *dssdev = td->dssdev;
1184         u8 state1, state2;
1185         int r;
1186
1187         mutex_lock(&td->lock);
1188
1189         if (!td->enabled) {
1190                 mutex_unlock(&td->lock);
1191                 return;
1192         }
1193
1194         dsi_bus_lock();
1195
1196         r = taal_dcs_read_1(DCS_RDDSDR, &state1);
1197         if (r) {
1198                 dev_err(&dssdev->dev, "failed to read Taal status\n");
1199                 goto err;
1200         }
1201
1202         /* Run self diagnostics */
1203         r = taal_sleep_out(td);
1204         if (r) {
1205                 dev_err(&dssdev->dev, "failed to run Taal self-diagnostics\n");
1206                 goto err;
1207         }
1208
1209         r = taal_dcs_read_1(DCS_RDDSDR, &state2);
1210         if (r) {
1211                 dev_err(&dssdev->dev, "failed to read Taal status\n");
1212                 goto err;
1213         }
1214
1215         /* Each sleep out command will trigger a self diagnostic and flip
1216          * Bit6 if the test passes.
1217          */
1218         if (!((state1 ^ state2) & (1 << 6))) {
1219                 dev_err(&dssdev->dev, "LCD self diagnostics failed\n");
1220                 goto err;
1221         }
1222         /* Self-diagnostics result is also shown on TE GPIO line. We need
1223          * to re-enable TE after self diagnostics */
1224         if (td->use_ext_te && td->te_enabled) {
1225                 r = taal_dcs_write_1(DCS_TEAR_ON, 0);
1226                 if (r)
1227                         goto err;
1228         }
1229
1230         dsi_bus_unlock();
1231
1232         queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
1233
1234         mutex_unlock(&td->lock);
1235         return;
1236 err:
1237         dev_err(&dssdev->dev, "performing LCD reset\n");
1238
1239         taal_power_off(dssdev);
1240         taal_hw_reset(dssdev);
1241         taal_power_on(dssdev);
1242
1243         dsi_bus_unlock();
1244
1245         queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
1246
1247         mutex_unlock(&td->lock);
1248 }
1249
1250 static int taal_set_update_mode(struct omap_dss_device *dssdev,
1251                 enum omap_dss_update_mode mode)
1252 {
1253         if (mode != OMAP_DSS_UPDATE_MANUAL)
1254                 return -EINVAL;
1255         return 0;
1256 }
1257
1258 static enum omap_dss_update_mode taal_get_update_mode(
1259                 struct omap_dss_device *dssdev)
1260 {
1261         return OMAP_DSS_UPDATE_MANUAL;
1262 }
1263
1264 static struct omap_dss_driver taal_driver = {
1265         .probe          = taal_probe,
1266         .remove         = taal_remove,
1267
1268         .enable         = taal_enable,
1269         .disable        = taal_disable,
1270         .suspend        = taal_suspend,
1271         .resume         = taal_resume,
1272
1273         .set_update_mode = taal_set_update_mode,
1274         .get_update_mode = taal_get_update_mode,
1275
1276         .update         = taal_update,
1277         .sync           = taal_sync,
1278
1279         .get_resolution = taal_get_resolution,
1280         .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1281
1282         .enable_te      = taal_enable_te,
1283         .get_te         = taal_get_te,
1284
1285         .set_rotate     = taal_rotate,
1286         .get_rotate     = taal_get_rotate,
1287         .set_mirror     = taal_mirror,
1288         .get_mirror     = taal_get_mirror,
1289         .run_test       = taal_run_test,
1290         .memory_read    = taal_memory_read,
1291
1292         .get_timings    = taal_get_timings,
1293
1294         .driver         = {
1295                 .name   = "taal",
1296                 .owner  = THIS_MODULE,
1297         },
1298 };
1299
1300 static int __init taal_init(void)
1301 {
1302         omap_dss_register_driver(&taal_driver);
1303
1304         return 0;
1305 }
1306
1307 static void __exit taal_exit(void)
1308 {
1309         omap_dss_unregister_driver(&taal_driver);
1310 }
1311
1312 module_init(taal_init);
1313 module_exit(taal_exit);
1314
1315 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
1316 MODULE_DESCRIPTION("Taal Driver");
1317 MODULE_LICENSE("GPL");