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/workqueue.h>
  32 #include <linux/slab.h>
  33 #include <linux/mutex.h>
  34
  35 #include <video/omapdss.h>
  36 #include <video/omap-panel-nokia-dsi.h>
  37 #include <video/mipi_display.h>
  38
  39 /* DSI Virtual channel. Hardcoded for now. */
  40 #define TCH 0
  41
  42 #define DCS_READ_NUM_ERRORS     0x05
  43 #define DCS_BRIGHTNESS          0x51
  44 #define DCS_CTRL_DISPLAY        0x53
  45 #define DCS_WRITE_CABC          0x55
  46 #define DCS_READ_CABC           0x56
  47 #define DCS_GET_ID1             0xda
  48 #define DCS_GET_ID2             0xdb
  49 #define DCS_GET_ID3             0xdc
  50
  51 static irqreturn_t taal_te_isr(int irq, void *data);
  52 static void taal_te_timeout_work_callback(struct work_struct *work);
  53 static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable);
  54
  55 static int taal_panel_reset(struct omap_dss_device *dssdev);
  56
  57 /**
  58  * struct panel_config - panel configuration
  59  * @name: panel name
  60  * @type: panel type
  61  * @timings: panel resolution
  62  * @sleep: various panel specific delays, passed to msleep() if non-zero
  63  * @reset_sequence: reset sequence timings, passed to udelay() if non-zero
  64  * @regulators: array of panel regulators
  65  * @num_regulators: number of regulators in the array
  66  */
  67 struct panel_config {
  68         const char *name;
  69         int type;
  70
  71         struct omap_video_timings timings;
  72
  73         struct {
  74                 unsigned int sleep_in;
  75                 unsigned int sleep_out;
  76                 unsigned int hw_reset;
  77                 unsigned int enable_te;
  78         } sleep;
  79
  80         struct {
  81                 unsigned int high;
  82                 unsigned int low;
  83         } reset_sequence;
  84
  85 };
  86
  87 enum {
  88         PANEL_TAAL,
  89 };
  90
  91 static struct panel_config panel_configs[] = {
  92         {
  93                 .name           = "taal",
  94                 .type           = PANEL_TAAL,
  95                 .timings        = {
  96                         .x_res          = 864,
  97                         .y_res          = 480,
  98                 },
  99                 .sleep          = {
 100                         .sleep_in       = 5,
 101                         .sleep_out      = 5,
 102                         .hw_reset       = 5,
 103                         .enable_te      = 100, /* possible panel bug */
 104                 },
 105                 .reset_sequence = {
 106                         .high           = 10,
 107                         .low            = 10,
 108                 },
 109         },
 110 };
 111
 112 struct taal_data {
 113         struct mutex lock;
 114
 115         struct backlight_device *bldev;
 116
 117         unsigned long   hw_guard_end;   /* next value of jiffies when we can
 118                                          * issue the next sleep in/out command
 119                                          */
 120         unsigned long   hw_guard_wait;  /* max guard time in jiffies */
 121
 122         struct omap_dss_device *dssdev;
 123
 124         bool enabled;
 125         u8 rotate;
 126         bool mirror;
 127
 128         bool te_enabled;
 129
 130         atomic_t do_update;
 131         int channel;
 132
 133         struct delayed_work te_timeout_work;
 134
 135         bool cabc_broken;
 136         unsigned cabc_mode;
 137
 138         bool intro_printed;
 139
 140         struct workqueue_struct *workqueue;
 141
 142         struct delayed_work esd_work;
 143         unsigned esd_interval;
 144
 145         bool ulps_enabled;
 146         unsigned ulps_timeout;
 147         struct delayed_work ulps_work;
 148
 149         struct panel_config *panel_config;
 150 };
 151
 152 static inline struct nokia_dsi_panel_data
 153 *get_panel_data(const struct omap_dss_device *dssdev)
 154 {
 155         return (struct nokia_dsi_panel_data *) dssdev->data;
 156 }
 157
 158 static void taal_esd_work(struct work_struct *work);
 159 static void taal_ulps_work(struct work_struct *work);
 160
 161 static void hw_guard_start(struct taal_data *td, int guard_msec)
 162 {
 163         td->hw_guard_wait = msecs_to_jiffies(guard_msec);
 164         td->hw_guard_end = jiffies + td->hw_guard_wait;
 165 }
 166
 167 static void hw_guard_wait(struct taal_data *td)
 168 {
 169         unsigned long wait = td->hw_guard_end - jiffies;
 170
 171         if ((long)wait > 0 && wait <= td->hw_guard_wait) {
 172                 set_current_state(TASK_UNINTERRUPTIBLE);
 173                 schedule_timeout(wait);
 174         }
 175 }
 176
 177 static int taal_dcs_read_1(struct taal_data *td, u8 dcs_cmd, u8 *data)
 178 {
 179         int r;
 180         u8 buf[1];
 181
 182         r = dsi_vc_dcs_read(td->dssdev, td->channel, dcs_cmd, buf, 1);
 183
 184         if (r < 0)
 185                 return r;
 186
 187         *data = buf[0];
 188
 189         return 0;
 190 }
 191
 192 static int taal_dcs_write_0(struct taal_data *td, u8 dcs_cmd)
 193 {
 194         return dsi_vc_dcs_write(td->dssdev, td->channel, &dcs_cmd, 1);
 195 }
 196
 197 static int taal_dcs_write_1(struct taal_data *td, u8 dcs_cmd, u8 param)
 198 {
 199         u8 buf[2];
 200         buf[0] = dcs_cmd;
 201         buf[1] = param;
 202         return dsi_vc_dcs_write(td->dssdev, td->channel, buf, 2);
 203 }
 204
 205 static int taal_sleep_in(struct taal_data *td)
 206
 207 {
 208         u8 cmd;
 209         int r;
 210
 211         hw_guard_wait(td);
 212
 213         cmd = MIPI_DCS_ENTER_SLEEP_MODE;
 214         r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, &cmd, 1);
 215         if (r)
 216                 return r;
 217
 218         hw_guard_start(td, 120);
 219
 220         if (td->panel_config->sleep.sleep_in)
 221                 msleep(td->panel_config->sleep.sleep_in);
 222
 223         return 0;
 224 }
 225
 226 static int taal_sleep_out(struct taal_data *td)
 227 {
 228         int r;
 229
 230         hw_guard_wait(td);
 231
 232         r = taal_dcs_write_0(td, MIPI_DCS_EXIT_SLEEP_MODE);
 233         if (r)
 234                 return r;
 235
 236         hw_guard_start(td, 120);
 237
 238         if (td->panel_config->sleep.sleep_out)
 239                 msleep(td->panel_config->sleep.sleep_out);
 240
 241         return 0;
 242 }
 243
 244 static int taal_get_id(struct taal_data *td, u8 *id1, u8 *id2, u8 *id3)
 245 {
 246         int r;
 247
 248         r = taal_dcs_read_1(td, DCS_GET_ID1, id1);
 249         if (r)
 250                 return r;
 251         r = taal_dcs_read_1(td, DCS_GET_ID2, id2);
 252         if (r)
 253                 return r;
 254         r = taal_dcs_read_1(td, DCS_GET_ID3, id3);
 255         if (r)
 256                 return r;
 257
 258         return 0;
 259 }
 260
 261 static int taal_set_addr_mode(struct taal_data *td, u8 rotate, bool mirror)
 262 {
 263         int r;
 264         u8 mode;
 265         int b5, b6, b7;
 266
 267         r = taal_dcs_read_1(td, MIPI_DCS_GET_ADDRESS_MODE, &mode);
 268         if (r)
 269                 return r;
 270
 271         switch (rotate) {
 272         default:
 273         case 0:
 274                 b7 = 0;
 275                 b6 = 0;
 276                 b5 = 0;
 277                 break;
 278         case 1:
 279                 b7 = 0;
 280                 b6 = 1;
 281                 b5 = 1;
 282                 break;
 283         case 2:
 284                 b7 = 1;
 285                 b6 = 1;
 286                 b5 = 0;
 287                 break;
 288         case 3:
 289                 b7 = 1;
 290                 b6 = 0;
 291                 b5 = 1;
 292                 break;
 293         }
 294
 295         if (mirror)
 296                 b6 = !b6;
 297
 298         mode &= ~((1<<7) | (1<<6) | (1<<5));
 299         mode |= (b7 << 7) | (b6 << 6) | (b5 << 5);
 300
 301         return taal_dcs_write_1(td, MIPI_DCS_SET_ADDRESS_MODE, mode);
 302 }
 303
 304 static int taal_set_update_window(struct taal_data *td,
 305                 u16 x, u16 y, u16 w, u16 h)
 306 {
 307         int r;
 308         u16 x1 = x;
 309         u16 x2 = x + w - 1;
 310         u16 y1 = y;
 311         u16 y2 = y + h - 1;
 312
 313         u8 buf[5];
 314         buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
 315         buf[1] = (x1 >> 8) & 0xff;
 316         buf[2] = (x1 >> 0) & 0xff;
 317         buf[3] = (x2 >> 8) & 0xff;
 318         buf[4] = (x2 >> 0) & 0xff;
 319
 320         r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf));
 321         if (r)
 322                 return r;
 323
 324         buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
 325         buf[1] = (y1 >> 8) & 0xff;
 326         buf[2] = (y1 >> 0) & 0xff;
 327         buf[3] = (y2 >> 8) & 0xff;
 328         buf[4] = (y2 >> 0) & 0xff;
 329
 330         r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf));
 331         if (r)
 332                 return r;
 333
 334         dsi_vc_send_bta_sync(td->dssdev, td->channel);
 335
 336         return r;
 337 }
 338
 339 static void taal_queue_esd_work(struct omap_dss_device *dssdev)
 340 {
 341         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 342
 343         if (td->esd_interval > 0)
 344                 queue_delayed_work(td->workqueue, &td->esd_work,
 345                                 msecs_to_jiffies(td->esd_interval));
 346 }
 347
 348 static void taal_cancel_esd_work(struct omap_dss_device *dssdev)
 349 {
 350         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 351
 352         cancel_delayed_work(&td->esd_work);
 353 }
 354
 355 static void taal_queue_ulps_work(struct omap_dss_device *dssdev)
 356 {
 357         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 358
 359         if (td->ulps_timeout > 0)
 360                 queue_delayed_work(td->workqueue, &td->ulps_work,
 361                                 msecs_to_jiffies(td->ulps_timeout));
 362 }
 363
 364 static void taal_cancel_ulps_work(struct omap_dss_device *dssdev)
 365 {
 366         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 367
 368         cancel_delayed_work(&td->ulps_work);
 369 }
 370
 371 static int taal_enter_ulps(struct omap_dss_device *dssdev)
 372 {
 373         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 374         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
 375         int r;
 376
 377         if (td->ulps_enabled)
 378                 return 0;
 379
 380         taal_cancel_ulps_work(dssdev);
 381
 382         r = _taal_enable_te(dssdev, false);
 383         if (r)
 384                 goto err;
 385
 386         disable_irq(gpio_to_irq(panel_data->ext_te_gpio));
 387
 388         omapdss_dsi_display_disable(dssdev, false, true);
 389
 390         td->ulps_enabled = true;
 391
 392         return 0;
 393
 394 err:
 395         dev_err(&dssdev->dev, "enter ULPS failed");
 396         taal_panel_reset(dssdev);
 397
 398         td->ulps_enabled = false;
 399
 400         taal_queue_ulps_work(dssdev);
 401
 402         return r;
 403 }
 404
 405 static int taal_exit_ulps(struct omap_dss_device *dssdev)
 406 {
 407         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 408         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
 409         int r;
 410
 411         if (!td->ulps_enabled)
 412                 return 0;
 413
 414         r = omapdss_dsi_display_enable(dssdev);
 415         if (r) {
 416                 dev_err(&dssdev->dev, "failed to enable DSI\n");
 417                 goto err1;
 418         }
 419
 420         omapdss_dsi_vc_enable_hs(dssdev, td->channel, true);
 421
 422         r = _taal_enable_te(dssdev, true);
 423         if (r) {
 424                 dev_err(&dssdev->dev, "failed to re-enable TE");
 425                 goto err2;
 426         }
 427
 428         enable_irq(gpio_to_irq(panel_data->ext_te_gpio));
 429
 430         taal_queue_ulps_work(dssdev);
 431
 432         td->ulps_enabled = false;
 433
 434         return 0;
 435
 436 err2:
 437         dev_err(&dssdev->dev, "failed to exit ULPS");
 438
 439         r = taal_panel_reset(dssdev);
 440         if (!r) {
 441                 enable_irq(gpio_to_irq(panel_data->ext_te_gpio));
 442                 td->ulps_enabled = false;
 443         }
 444 err1:
 445         taal_queue_ulps_work(dssdev);
 446
 447         return r;
 448 }
 449
 450 static int taal_wake_up(struct omap_dss_device *dssdev)
 451 {
 452         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 453
 454         if (td->ulps_enabled)
 455                 return taal_exit_ulps(dssdev);
 456
 457         taal_cancel_ulps_work(dssdev);
 458         taal_queue_ulps_work(dssdev);
 459         return 0;
 460 }
 461
 462 static int taal_bl_update_status(struct backlight_device *dev)
 463 {
 464         struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev);
 465         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 466         int r;
 467         int level;
 468
 469         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 470                         dev->props.power == FB_BLANK_UNBLANK)
 471                 level = dev->props.brightness;
 472         else
 473                 level = 0;
 474
 475         dev_dbg(&dssdev->dev, "update brightness to %d\n", level);
 476
 477         mutex_lock(&td->lock);
 478
 479         if (td->enabled) {
 480                 dsi_bus_lock(dssdev);
 481
 482                 r = taal_wake_up(dssdev);
 483                 if (!r)
 484                         r = taal_dcs_write_1(td, DCS_BRIGHTNESS, level);
 485
 486                 dsi_bus_unlock(dssdev);
 487         } else {
 488                 r = 0;
 489         }
 490
 491         mutex_unlock(&td->lock);
 492
 493         return r;
 494 }
 495
 496 static int taal_bl_get_intensity(struct backlight_device *dev)
 497 {
 498         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 499                         dev->props.power == FB_BLANK_UNBLANK)
 500                 return dev->props.brightness;
 501
 502         return 0;
 503 }
 504
 505 static const struct backlight_ops taal_bl_ops = {
 506         .get_brightness = taal_bl_get_intensity,
 507         .update_status  = taal_bl_update_status,
 508 };
 509
 510 static void taal_get_resolution(struct omap_dss_device *dssdev,
 511                 u16 *xres, u16 *yres)
 512 {
 513         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 514
 515         if (td->rotate == 0 || td->rotate == 2) {
 516                 *xres = dssdev->panel.timings.x_res;
 517                 *yres = dssdev->panel.timings.y_res;
 518         } else {
 519                 *yres = dssdev->panel.timings.x_res;
 520                 *xres = dssdev->panel.timings.y_res;
 521         }
 522 }
 523
 524 static ssize_t taal_num_errors_show(struct device *dev,
 525                 struct device_attribute *attr, char *buf)
 526 {
 527         struct omap_dss_device *dssdev = to_dss_device(dev);
 528         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 529         u8 errors = 0;
 530         int r;
 531
 532         mutex_lock(&td->lock);
 533
 534         if (td->enabled) {
 535                 dsi_bus_lock(dssdev);
 536
 537                 r = taal_wake_up(dssdev);
 538                 if (!r)
 539                         r = taal_dcs_read_1(td, DCS_READ_NUM_ERRORS, &errors);
 540
 541                 dsi_bus_unlock(dssdev);
 542         } else {
 543                 r = -ENODEV;
 544         }
 545
 546         mutex_unlock(&td->lock);
 547
 548         if (r)
 549                 return r;
 550
 551         return snprintf(buf, PAGE_SIZE, "%d\n", errors);
 552 }
 553
 554 static ssize_t taal_hw_revision_show(struct device *dev,
 555                 struct device_attribute *attr, char *buf)
 556 {
 557         struct omap_dss_device *dssdev = to_dss_device(dev);
 558         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 559         u8 id1, id2, id3;
 560         int r;
 561
 562         mutex_lock(&td->lock);
 563
 564         if (td->enabled) {
 565                 dsi_bus_lock(dssdev);
 566
 567                 r = taal_wake_up(dssdev);
 568                 if (!r)
 569                         r = taal_get_id(td, &id1, &id2, &id3);
 570
 571                 dsi_bus_unlock(dssdev);
 572         } else {
 573                 r = -ENODEV;
 574         }
 575
 576         mutex_unlock(&td->lock);
 577
 578         if (r)
 579                 return r;
 580
 581         return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
 582 }
 583
 584 static const char *cabc_modes[] = {
 585         "off",          /* used also always when CABC is not supported */
 586         "ui",
 587         "still-image",
 588         "moving-image",
 589 };
 590
 591 static ssize_t show_cabc_mode(struct device *dev,
 592                 struct device_attribute *attr,
 593                 char *buf)
 594 {
 595         struct omap_dss_device *dssdev = to_dss_device(dev);
 596         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 597         const char *mode_str;
 598         int mode;
 599         int len;
 600
 601         mode = td->cabc_mode;
 602
 603         mode_str = "unknown";
 604         if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
 605                 mode_str = cabc_modes[mode];
 606         len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);
 607
 608         return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
 609 }
 610
 611 static ssize_t store_cabc_mode(struct device *dev,
 612                 struct device_attribute *attr,
 613                 const char *buf, size_t count)
 614 {
 615         struct omap_dss_device *dssdev = to_dss_device(dev);
 616         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 617         int i;
 618         int r;
 619
 620         for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
 621                 if (sysfs_streq(cabc_modes[i], buf))
 622                         break;
 623         }
 624
 625         if (i == ARRAY_SIZE(cabc_modes))
 626                 return -EINVAL;
 627
 628         mutex_lock(&td->lock);
 629
 630         if (td->enabled) {
 631                 dsi_bus_lock(dssdev);
 632
 633                 if (!td->cabc_broken) {
 634                         r = taal_wake_up(dssdev);
 635                         if (r)
 636                                 goto err;
 637
 638                         r = taal_dcs_write_1(td, DCS_WRITE_CABC, i);
 639                         if (r)
 640                                 goto err;
 641                 }
 642
 643                 dsi_bus_unlock(dssdev);
 644         }
 645
 646         td->cabc_mode = i;
 647
 648         mutex_unlock(&td->lock);
 649
 650         return count;
 651 err:
 652         dsi_bus_unlock(dssdev);
 653         mutex_unlock(&td->lock);
 654         return r;
 655 }
 656
 657 static ssize_t show_cabc_available_modes(struct device *dev,
 658                 struct device_attribute *attr,
 659                 char *buf)
 660 {
 661         int len;
 662         int i;
 663
 664         for (i = 0, len = 0;
 665              len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
 666                 len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
 667                         i ? " " : "", cabc_modes[i],
 668                         i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");
 669
 670         return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
 671 }
 672
 673 static ssize_t taal_store_esd_interval(struct device *dev,
 674                 struct device_attribute *attr,
 675                 const char *buf, size_t count)
 676 {
 677         struct omap_dss_device *dssdev = to_dss_device(dev);
 678         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 679
 680         unsigned long t;
 681         int r;
 682
 683         r = strict_strtoul(buf, 10, &t);
 684         if (r)
 685                 return r;
 686
 687         mutex_lock(&td->lock);
 688         taal_cancel_esd_work(dssdev);
 689         td->esd_interval = t;
 690         if (td->enabled)
 691                 taal_queue_esd_work(dssdev);
 692         mutex_unlock(&td->lock);
 693
 694         return count;
 695 }
 696
 697 static ssize_t taal_show_esd_interval(struct device *dev,
 698                 struct device_attribute *attr,
 699                 char *buf)
 700 {
 701         struct omap_dss_device *dssdev = to_dss_device(dev);
 702         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 703         unsigned t;
 704
 705         mutex_lock(&td->lock);
 706         t = td->esd_interval;
 707         mutex_unlock(&td->lock);
 708
 709         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 710 }
 711
 712 static ssize_t taal_store_ulps(struct device *dev,
 713                 struct device_attribute *attr,
 714                 const char *buf, size_t count)
 715 {
 716         struct omap_dss_device *dssdev = to_dss_device(dev);
 717         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 718         unsigned long t;
 719         int r;
 720
 721         r = strict_strtoul(buf, 10, &t);
 722         if (r)
 723                 return r;
 724
 725         mutex_lock(&td->lock);
 726
 727         if (td->enabled) {
 728                 dsi_bus_lock(dssdev);
 729
 730                 if (t)
 731                         r = taal_enter_ulps(dssdev);
 732                 else
 733                         r = taal_wake_up(dssdev);
 734
 735                 dsi_bus_unlock(dssdev);
 736         }
 737
 738         mutex_unlock(&td->lock);
 739
 740         if (r)
 741                 return r;
 742
 743         return count;
 744 }
 745
 746 static ssize_t taal_show_ulps(struct device *dev,
 747                 struct device_attribute *attr,
 748                 char *buf)
 749 {
 750         struct omap_dss_device *dssdev = to_dss_device(dev);
 751         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 752         unsigned t;
 753
 754         mutex_lock(&td->lock);
 755         t = td->ulps_enabled;
 756         mutex_unlock(&td->lock);
 757
 758         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 759 }
 760
 761 static ssize_t taal_store_ulps_timeout(struct device *dev,
 762                 struct device_attribute *attr,
 763                 const char *buf, size_t count)
 764 {
 765         struct omap_dss_device *dssdev = to_dss_device(dev);
 766         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 767         unsigned long t;
 768         int r;
 769
 770         r = strict_strtoul(buf, 10, &t);
 771         if (r)
 772                 return r;
 773
 774         mutex_lock(&td->lock);
 775         td->ulps_timeout = t;
 776
 777         if (td->enabled) {
 778                 /* taal_wake_up will restart the timer */
 779                 dsi_bus_lock(dssdev);
 780                 r = taal_wake_up(dssdev);
 781                 dsi_bus_unlock(dssdev);
 782         }
 783
 784         mutex_unlock(&td->lock);
 785
 786         if (r)
 787                 return r;
 788
 789         return count;
 790 }
 791
 792 static ssize_t taal_show_ulps_timeout(struct device *dev,
 793                 struct device_attribute *attr,
 794                 char *buf)
 795 {
 796         struct omap_dss_device *dssdev = to_dss_device(dev);
 797         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 798         unsigned t;
 799
 800         mutex_lock(&td->lock);
 801         t = td->ulps_timeout;
 802         mutex_unlock(&td->lock);
 803
 804         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 805 }
 806
 807 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL);
 808 static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL);
 809 static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
 810                 show_cabc_mode, store_cabc_mode);
 811 static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
 812                 show_cabc_available_modes, NULL);
 813 static DEVICE_ATTR(esd_interval, S_IRUGO | S_IWUSR,
 814                 taal_show_esd_interval, taal_store_esd_interval);
 815 static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
 816                 taal_show_ulps, taal_store_ulps);
 817 static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
 818                 taal_show_ulps_timeout, taal_store_ulps_timeout);
 819
 820 static struct attribute *taal_attrs[] = {
 821         &dev_attr_num_dsi_errors.attr,
 822         &dev_attr_hw_revision.attr,
 823         &dev_attr_cabc_mode.attr,
 824         &dev_attr_cabc_available_modes.attr,
 825         &dev_attr_esd_interval.attr,
 826         &dev_attr_ulps.attr,
 827         &dev_attr_ulps_timeout.attr,
 828         NULL,
 829 };
 830
 831 static struct attribute_group taal_attr_group = {
 832         .attrs = taal_attrs,
 833 };
 834
 835 static void taal_hw_reset(struct omap_dss_device *dssdev)
 836 {
 837         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 838         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
 839
 840         if (panel_data->reset_gpio == -1)
 841                 return;
 842
 843         gpio_set_value(panel_data->reset_gpio, 1);
 844         if (td->panel_config->reset_sequence.high)
 845                 udelay(td->panel_config->reset_sequence.high);
 846         /* reset the panel */
 847         gpio_set_value(panel_data->reset_gpio, 0);
 848         /* assert reset */
 849         if (td->panel_config->reset_sequence.low)
 850                 udelay(td->panel_config->reset_sequence.low);
 851         gpio_set_value(panel_data->reset_gpio, 1);
 852         /* wait after releasing reset */
 853         if (td->panel_config->sleep.hw_reset)
 854                 msleep(td->panel_config->sleep.hw_reset);
 855 }
 856
 857 static int taal_probe(struct omap_dss_device *dssdev)
 858 {
 859         struct backlight_properties props;
 860         struct taal_data *td;
 861         struct backlight_device *bldev = NULL;
 862         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
 863         struct panel_config *panel_config = NULL;
 864         int r, i;
 865
 866         dev_dbg(&dssdev->dev, "probe\n");
 867
 868         if (!panel_data || !panel_data->name) {
 869                 r = -EINVAL;
 870                 goto err;
 871         }
 872
 873         for (i = 0; i < ARRAY_SIZE(panel_configs); i++) {
 874                 if (strcmp(panel_data->name, panel_configs[i].name) == 0) {
 875                         panel_config = &panel_configs[i];
 876                         break;
 877                 }
 878         }
 879
 880         if (!panel_config) {
 881                 r = -EINVAL;
 882                 goto err;
 883         }
 884
 885         dssdev->panel.timings = panel_config->timings;
 886         dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
 887
 888         td = kzalloc(sizeof(*td), GFP_KERNEL);
 889         if (!td) {
 890                 r = -ENOMEM;
 891                 goto err;
 892         }
 893         td->dssdev = dssdev;
 894         td->panel_config = panel_config;
 895         td->esd_interval = panel_data->esd_interval;
 896         td->ulps_enabled = false;
 897         td->ulps_timeout = panel_data->ulps_timeout;
 898
 899         mutex_init(&td->lock);
 900
 901         atomic_set(&td->do_update, 0);
 902
 903         td->workqueue = create_singlethread_workqueue("taal_esd");
 904         if (td->workqueue == NULL) {
 905                 dev_err(&dssdev->dev, "can't create ESD workqueue\n");
 906                 r = -ENOMEM;
 907                 goto err_wq;
 908         }
 909         INIT_DEFERRABLE_WORK(&td->esd_work, taal_esd_work);
 910         INIT_DELAYED_WORK(&td->ulps_work, taal_ulps_work);
 911
 912         dev_set_drvdata(&dssdev->dev, td);
 913
 914         if (gpio_is_valid(panel_data->reset_gpio)) {
 915                 r = gpio_request_one(panel_data->reset_gpio, GPIOF_OUT_INIT_LOW,
 916                                 "taal rst");
 917                 if (r) {
 918                         dev_err(&dssdev->dev, "failed to request reset gpio\n");
 919                         goto err_rst_gpio;
 920                 }
 921         }
 922
 923         taal_hw_reset(dssdev);
 924
 925         if (panel_data->use_dsi_backlight) {
 926                 memset(&props, 0, sizeof(struct backlight_properties));
 927                 props.max_brightness = 255;
 928
 929                 props.type = BACKLIGHT_RAW;
 930                 bldev = backlight_device_register(dev_name(&dssdev->dev),
 931                                 &dssdev->dev, dssdev, &taal_bl_ops, &props);
 932                 if (IS_ERR(bldev)) {
 933                         r = PTR_ERR(bldev);
 934                         goto err_bl;
 935                 }
 936
 937                 td->bldev = bldev;
 938
 939                 bldev->props.fb_blank = FB_BLANK_UNBLANK;
 940                 bldev->props.power = FB_BLANK_UNBLANK;
 941                 bldev->props.brightness = 255;
 942
 943                 taal_bl_update_status(bldev);
 944         }
 945
 946         if (panel_data->use_ext_te) {
 947                 int gpio = panel_data->ext_te_gpio;
 948
 949                 r = gpio_request_one(gpio, GPIOF_IN, "taal irq");
 950                 if (r) {
 951                         dev_err(&dssdev->dev, "GPIO request failed\n");
 952                         goto err_gpio;
 953                 }
 954
 955                 r = request_irq(gpio_to_irq(gpio), taal_te_isr,
 956                                 IRQF_TRIGGER_RISING,
 957                                 "taal vsync", dssdev);
 958
 959                 if (r) {
 960                         dev_err(&dssdev->dev, "IRQ request failed\n");
 961                         gpio_free(gpio);
 962                         goto err_irq;
 963                 }
 964
 965                 INIT_DEFERRABLE_WORK(&td->te_timeout_work,
 966                                      taal_te_timeout_work_callback);
 967
 968                 dev_dbg(&dssdev->dev, "Using GPIO TE\n");
 969         }
 970
 971         r = omap_dsi_request_vc(dssdev, &td->channel);
 972         if (r) {
 973                 dev_err(&dssdev->dev, "failed to get virtual channel\n");
 974                 goto err_req_vc;
 975         }
 976
 977         r = omap_dsi_set_vc_id(dssdev, td->channel, TCH);
 978         if (r) {
 979                 dev_err(&dssdev->dev, "failed to set VC_ID\n");
 980                 goto err_vc_id;
 981         }
 982
 983         r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group);
 984         if (r) {
 985                 dev_err(&dssdev->dev, "failed to create sysfs files\n");
 986                 goto err_vc_id;
 987         }
 988
 989         return 0;
 990
 991 err_vc_id:
 992         omap_dsi_release_vc(dssdev, td->channel);
 993 err_req_vc:
 994         if (panel_data->use_ext_te)
 995                 free_irq(gpio_to_irq(panel_data->ext_te_gpio), dssdev);
 996 err_irq:
 997         if (panel_data->use_ext_te)
 998                 gpio_free(panel_data->ext_te_gpio);
 999 err_gpio:
1000         if (bldev != NULL)
1001                 backlight_device_unregister(bldev);
1002 err_bl:
1003         if (gpio_is_valid(panel_data->reset_gpio))
1004                 gpio_free(panel_data->reset_gpio);
1005 err_rst_gpio:
1006         destroy_workqueue(td->workqueue);
1007 err_wq:
1008         kfree(td);
1009 err:
1010         return r;
1011 }
1012
1013 static void __exit taal_remove(struct omap_dss_device *dssdev)
1014 {
1015         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1016         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
1017         struct backlight_device *bldev;
1018
1019         dev_dbg(&dssdev->dev, "remove\n");
1020
1021         sysfs_remove_group(&dssdev->dev.kobj, &taal_attr_group);
1022         omap_dsi_release_vc(dssdev, td->channel);
1023
1024         if (panel_data->use_ext_te) {
1025                 int gpio = panel_data->ext_te_gpio;
1026                 free_irq(gpio_to_irq(gpio), dssdev);
1027                 gpio_free(gpio);
1028         }
1029
1030         bldev = td->bldev;
1031         if (bldev != NULL) {
1032                 bldev->props.power = FB_BLANK_POWERDOWN;
1033                 taal_bl_update_status(bldev);
1034                 backlight_device_unregister(bldev);
1035         }
1036
1037         taal_cancel_ulps_work(dssdev);
1038         taal_cancel_esd_work(dssdev);
1039         destroy_workqueue(td->workqueue);
1040
1041         /* reset, to be sure that the panel is in a valid state */
1042         taal_hw_reset(dssdev);
1043
1044         if (gpio_is_valid(panel_data->reset_gpio))
1045                 gpio_free(panel_data->reset_gpio);
1046
1047         kfree(td);
1048 }
1049
1050 static int taal_power_on(struct omap_dss_device *dssdev)
1051 {
1052         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1053         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
1054         u8 id1, id2, id3;
1055         int r;
1056
1057         r = omapdss_dsi_configure_pins(dssdev, &panel_data->pin_config);
1058         if (r) {
1059                 dev_err(&dssdev->dev, "failed to configure DSI pins\n");
1060                 goto err0;
1061         };
1062
1063         r = omapdss_dsi_display_enable(dssdev);
1064         if (r) {
1065                 dev_err(&dssdev->dev, "failed to enable DSI\n");
1066                 goto err0;
1067         }
1068
1069         taal_hw_reset(dssdev);
1070
1071         omapdss_dsi_vc_enable_hs(dssdev, td->channel, false);
1072
1073         r = taal_sleep_out(td);
1074         if (r)
1075                 goto err;
1076
1077         r = taal_get_id(td, &id1, &id2, &id3);
1078         if (r)
1079                 goto err;
1080
1081         /* on early Taal revisions CABC is broken */
1082         if (td->panel_config->type == PANEL_TAAL &&
1083                 (id2 == 0x00 || id2 == 0xff || id2 == 0x81))
1084                 td->cabc_broken = true;
1085
1086         r = taal_dcs_write_1(td, DCS_BRIGHTNESS, 0xff);
1087         if (r)
1088                 goto err;
1089
1090         r = taal_dcs_write_1(td, DCS_CTRL_DISPLAY,
1091                         (1<<2) | (1<<5));       /* BL | BCTRL */
1092         if (r)
1093                 goto err;
1094
1095         r = taal_dcs_write_1(td, MIPI_DCS_SET_PIXEL_FORMAT,
1096                 MIPI_DCS_PIXEL_FMT_24BIT);
1097         if (r)
1098                 goto err;
1099
1100         r = taal_set_addr_mode(td, td->rotate, td->mirror);
1101         if (r)
1102                 goto err;
1103
1104         if (!td->cabc_broken) {
1105                 r = taal_dcs_write_1(td, DCS_WRITE_CABC, td->cabc_mode);
1106                 if (r)
1107                         goto err;
1108         }
1109
1110         r = taal_dcs_write_0(td, MIPI_DCS_SET_DISPLAY_ON);
1111         if (r)
1112                 goto err;
1113
1114         r = _taal_enable_te(dssdev, td->te_enabled);
1115         if (r)
1116                 goto err;
1117
1118         r = dsi_enable_video_output(dssdev, td->channel);
1119         if (r)
1120                 goto err;
1121
1122         td->enabled = 1;
1123
1124         if (!td->intro_printed) {
1125                 dev_info(&dssdev->dev, "%s panel revision %02x.%02x.%02x\n",
1126                         td->panel_config->name, id1, id2, id3);
1127                 if (td->cabc_broken)
1128                         dev_info(&dssdev->dev,
1129                                         "old Taal version, CABC disabled\n");
1130                 td->intro_printed = true;
1131         }
1132
1133         omapdss_dsi_vc_enable_hs(dssdev, td->channel, true);
1134
1135         return 0;
1136 err:
1137         dev_err(&dssdev->dev, "error while enabling panel, issuing HW reset\n");
1138
1139         taal_hw_reset(dssdev);
1140
1141         omapdss_dsi_display_disable(dssdev, true, false);
1142 err0:
1143         return r;
1144 }
1145
1146 static void taal_power_off(struct omap_dss_device *dssdev)
1147 {
1148         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1149         int r;
1150
1151         dsi_disable_video_output(dssdev, td->channel);
1152
1153         r = taal_dcs_write_0(td, MIPI_DCS_SET_DISPLAY_OFF);
1154         if (!r)
1155                 r = taal_sleep_in(td);
1156
1157         if (r) {
1158                 dev_err(&dssdev->dev,
1159                                 "error disabling panel, issuing HW reset\n");
1160                 taal_hw_reset(dssdev);
1161         }
1162
1163         omapdss_dsi_display_disable(dssdev, true, false);
1164
1165         td->enabled = 0;
1166 }
1167
1168 static int taal_panel_reset(struct omap_dss_device *dssdev)
1169 {
1170         dev_err(&dssdev->dev, "performing LCD reset\n");
1171
1172         taal_power_off(dssdev);
1173         taal_hw_reset(dssdev);
1174         return taal_power_on(dssdev);
1175 }
1176
1177 static int taal_enable(struct omap_dss_device *dssdev)
1178 {
1179         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1180         int r;
1181
1182         dev_dbg(&dssdev->dev, "enable\n");
1183
1184         mutex_lock(&td->lock);
1185
1186         if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
1187                 r = -EINVAL;
1188                 goto err;
1189         }
1190
1191         dsi_bus_lock(dssdev);
1192
1193         r = taal_power_on(dssdev);
1194
1195         dsi_bus_unlock(dssdev);
1196
1197         if (r)
1198                 goto err;
1199
1200         taal_queue_esd_work(dssdev);
1201
1202         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
1203
1204         mutex_unlock(&td->lock);
1205
1206         return 0;
1207 err:
1208         dev_dbg(&dssdev->dev, "enable failed\n");
1209         mutex_unlock(&td->lock);
1210         return r;
1211 }
1212
1213 static void taal_disable(struct omap_dss_device *dssdev)
1214 {
1215         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1216
1217         dev_dbg(&dssdev->dev, "disable\n");
1218
1219         mutex_lock(&td->lock);
1220
1221         taal_cancel_ulps_work(dssdev);
1222         taal_cancel_esd_work(dssdev);
1223
1224         dsi_bus_lock(dssdev);
1225
1226         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
1227                 int r;
1228
1229                 r = taal_wake_up(dssdev);
1230                 if (!r)
1231                         taal_power_off(dssdev);
1232         }
1233
1234         dsi_bus_unlock(dssdev);
1235
1236         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
1237
1238         mutex_unlock(&td->lock);
1239 }
1240
1241 static int taal_suspend(struct omap_dss_device *dssdev)
1242 {
1243         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1244         int r;
1245
1246         dev_dbg(&dssdev->dev, "suspend\n");
1247
1248         mutex_lock(&td->lock);
1249
1250         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
1251                 r = -EINVAL;
1252                 goto err;
1253         }
1254
1255         taal_cancel_ulps_work(dssdev);
1256         taal_cancel_esd_work(dssdev);
1257
1258         dsi_bus_lock(dssdev);
1259
1260         r = taal_wake_up(dssdev);
1261         if (!r)
1262                 taal_power_off(dssdev);
1263
1264         dsi_bus_unlock(dssdev);
1265
1266         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
1267
1268         mutex_unlock(&td->lock);
1269
1270         return 0;
1271 err:
1272         mutex_unlock(&td->lock);
1273         return r;
1274 }
1275
1276 static int taal_resume(struct omap_dss_device *dssdev)
1277 {
1278         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1279         int r;
1280
1281         dev_dbg(&dssdev->dev, "resume\n");
1282
1283         mutex_lock(&td->lock);
1284
1285         if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
1286                 r = -EINVAL;
1287                 goto err;
1288         }
1289
1290         dsi_bus_lock(dssdev);
1291
1292         r = taal_power_on(dssdev);
1293
1294         dsi_bus_unlock(dssdev);
1295
1296         if (r) {
1297                 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
1298         } else {
1299                 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
1300                 taal_queue_esd_work(dssdev);
1301         }
1302
1303         mutex_unlock(&td->lock);
1304
1305         return r;
1306 err:
1307         mutex_unlock(&td->lock);
1308         return r;
1309 }
1310
1311 static void taal_framedone_cb(int err, void *data)
1312 {
1313         struct omap_dss_device *dssdev = data;
1314         dev_dbg(&dssdev->dev, "framedone, err %d\n", err);
1315         dsi_bus_unlock(dssdev);
1316 }
1317
1318 static irqreturn_t taal_te_isr(int irq, void *data)
1319 {
1320         struct omap_dss_device *dssdev = data;
1321         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1322         int old;
1323         int r;
1324
1325         old = atomic_cmpxchg(&td->do_update, 1, 0);
1326
1327         if (old) {
1328                 cancel_delayed_work(&td->te_timeout_work);
1329
1330                 r = omap_dsi_update(dssdev, td->channel, taal_framedone_cb,
1331                                 dssdev);
1332                 if (r)
1333                         goto err;
1334         }
1335
1336         return IRQ_HANDLED;
1337 err:
1338         dev_err(&dssdev->dev, "start update failed\n");
1339         dsi_bus_unlock(dssdev);
1340         return IRQ_HANDLED;
1341 }
1342
1343 static void taal_te_timeout_work_callback(struct work_struct *work)
1344 {
1345         struct taal_data *td = container_of(work, struct taal_data,
1346                                         te_timeout_work.work);
1347         struct omap_dss_device *dssdev = td->dssdev;
1348
1349         dev_err(&dssdev->dev, "TE not received for 250ms!\n");
1350
1351         atomic_set(&td->do_update, 0);
1352         dsi_bus_unlock(dssdev);
1353 }
1354
1355 static int taal_update(struct omap_dss_device *dssdev,
1356                                     u16 x, u16 y, u16 w, u16 h)
1357 {
1358         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1359         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
1360         int r;
1361
1362         dev_dbg(&dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
1363
1364         mutex_lock(&td->lock);
1365         dsi_bus_lock(dssdev);
1366
1367         r = taal_wake_up(dssdev);
1368         if (r)
1369                 goto err;
1370
1371         if (!td->enabled) {
1372                 r = 0;
1373                 goto err;
1374         }
1375
1376         /* XXX no need to send this every frame, but dsi break if not done */
1377         r = taal_set_update_window(td, 0, 0,
1378                         td->panel_config->timings.x_res,
1379                         td->panel_config->timings.y_res);
1380         if (r)
1381                 goto err;
1382
1383         if (td->te_enabled && panel_data->use_ext_te) {
1384                 schedule_delayed_work(&td->te_timeout_work,
1385                                 msecs_to_jiffies(250));
1386                 atomic_set(&td->do_update, 1);
1387         } else {
1388                 r = omap_dsi_update(dssdev, td->channel, taal_framedone_cb,
1389                                 dssdev);
1390                 if (r)
1391                         goto err;
1392         }
1393
1394         /* note: no bus_unlock here. unlock is in framedone_cb */
1395         mutex_unlock(&td->lock);
1396         return 0;
1397 err:
1398         dsi_bus_unlock(dssdev);
1399         mutex_unlock(&td->lock);
1400         return r;
1401 }
1402
1403 static int taal_sync(struct omap_dss_device *dssdev)
1404 {
1405         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1406
1407         dev_dbg(&dssdev->dev, "sync\n");
1408
1409         mutex_lock(&td->lock);
1410         dsi_bus_lock(dssdev);
1411         dsi_bus_unlock(dssdev);
1412         mutex_unlock(&td->lock);
1413
1414         dev_dbg(&dssdev->dev, "sync done\n");
1415
1416         return 0;
1417 }
1418
1419 static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable)
1420 {
1421         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1422         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
1423         int r;
1424
1425         if (enable)
1426                 r = taal_dcs_write_1(td, MIPI_DCS_SET_TEAR_ON, 0);
1427         else
1428                 r = taal_dcs_write_0(td, MIPI_DCS_SET_TEAR_OFF);
1429
1430         if (!panel_data->use_ext_te)
1431                 omapdss_dsi_enable_te(dssdev, enable);
1432
1433         if (td->panel_config->sleep.enable_te)
1434                 msleep(td->panel_config->sleep.enable_te);
1435
1436         return r;
1437 }
1438
1439 static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
1440 {
1441         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1442         int r;
1443
1444         mutex_lock(&td->lock);
1445
1446         if (td->te_enabled == enable)
1447                 goto end;
1448
1449         dsi_bus_lock(dssdev);
1450
1451         if (td->enabled) {
1452                 r = taal_wake_up(dssdev);
1453                 if (r)
1454                         goto err;
1455
1456                 r = _taal_enable_te(dssdev, enable);
1457                 if (r)
1458                         goto err;
1459         }
1460
1461         td->te_enabled = enable;
1462
1463         dsi_bus_unlock(dssdev);
1464 end:
1465         mutex_unlock(&td->lock);
1466
1467         return 0;
1468 err:
1469         dsi_bus_unlock(dssdev);
1470         mutex_unlock(&td->lock);
1471
1472         return r;
1473 }
1474
1475 static int taal_get_te(struct omap_dss_device *dssdev)
1476 {
1477         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1478         int r;
1479
1480         mutex_lock(&td->lock);
1481         r = td->te_enabled;
1482         mutex_unlock(&td->lock);
1483
1484         return r;
1485 }
1486
1487 static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
1488 {
1489         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1490         int r;
1491
1492         dev_dbg(&dssdev->dev, "rotate %d\n", rotate);
1493
1494         mutex_lock(&td->lock);
1495
1496         if (td->rotate == rotate)
1497                 goto end;
1498
1499         dsi_bus_lock(dssdev);
1500
1501         if (td->enabled) {
1502                 r = taal_wake_up(dssdev);
1503                 if (r)
1504                         goto err;
1505
1506                 r = taal_set_addr_mode(td, rotate, td->mirror);
1507                 if (r)
1508                         goto err;
1509         }
1510
1511         td->rotate = rotate;
1512
1513         dsi_bus_unlock(dssdev);
1514 end:
1515         mutex_unlock(&td->lock);
1516         return 0;
1517 err:
1518         dsi_bus_unlock(dssdev);
1519         mutex_unlock(&td->lock);
1520         return r;
1521 }
1522
1523 static u8 taal_get_rotate(struct omap_dss_device *dssdev)
1524 {
1525         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1526         int r;
1527
1528         mutex_lock(&td->lock);
1529         r = td->rotate;
1530         mutex_unlock(&td->lock);
1531
1532         return r;
1533 }
1534
1535 static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
1536 {
1537         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1538         int r;
1539
1540         dev_dbg(&dssdev->dev, "mirror %d\n", enable);
1541
1542         mutex_lock(&td->lock);
1543
1544         if (td->mirror == enable)
1545                 goto end;
1546
1547         dsi_bus_lock(dssdev);
1548         if (td->enabled) {
1549                 r = taal_wake_up(dssdev);
1550                 if (r)
1551                         goto err;
1552
1553                 r = taal_set_addr_mode(td, td->rotate, enable);
1554                 if (r)
1555                         goto err;
1556         }
1557
1558         td->mirror = enable;
1559
1560         dsi_bus_unlock(dssdev);
1561 end:
1562         mutex_unlock(&td->lock);
1563         return 0;
1564 err:
1565         dsi_bus_unlock(dssdev);
1566         mutex_unlock(&td->lock);
1567         return r;
1568 }
1569
1570 static bool taal_get_mirror(struct omap_dss_device *dssdev)
1571 {
1572         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1573         int r;
1574
1575         mutex_lock(&td->lock);
1576         r = td->mirror;
1577         mutex_unlock(&td->lock);
1578
1579         return r;
1580 }
1581
1582 static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
1583 {
1584         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1585         u8 id1, id2, id3;
1586         int r;
1587
1588         mutex_lock(&td->lock);
1589
1590         if (!td->enabled) {
1591                 r = -ENODEV;
1592                 goto err1;
1593         }
1594
1595         dsi_bus_lock(dssdev);
1596
1597         r = taal_wake_up(dssdev);
1598         if (r)
1599                 goto err2;
1600
1601         r = taal_dcs_read_1(td, DCS_GET_ID1, &id1);
1602         if (r)
1603                 goto err2;
1604         r = taal_dcs_read_1(td, DCS_GET_ID2, &id2);
1605         if (r)
1606                 goto err2;
1607         r = taal_dcs_read_1(td, DCS_GET_ID3, &id3);
1608         if (r)
1609                 goto err2;
1610
1611         dsi_bus_unlock(dssdev);
1612         mutex_unlock(&td->lock);
1613         return 0;
1614 err2:
1615         dsi_bus_unlock(dssdev);
1616 err1:
1617         mutex_unlock(&td->lock);
1618         return r;
1619 }
1620
1621 static int taal_memory_read(struct omap_dss_device *dssdev,
1622                 void *buf, size_t size,
1623                 u16 x, u16 y, u16 w, u16 h)
1624 {
1625         int r;
1626         int first = 1;
1627         int plen;
1628         unsigned buf_used = 0;
1629         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
1630
1631         if (size < w * h * 3)
1632                 return -ENOMEM;
1633
1634         mutex_lock(&td->lock);
1635
1636         if (!td->enabled) {
1637                 r = -ENODEV;
1638                 goto err1;
1639         }
1640
1641         size = min(w * h * 3,
1642                         dssdev->panel.timings.x_res *
1643                         dssdev->panel.timings.y_res * 3);
1644
1645         dsi_bus_lock(dssdev);
1646
1647         r = taal_wake_up(dssdev);
1648         if (r)
1649                 goto err2;
1650
1651         /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1652          * use short packets. plen 32 works, but bigger packets seem to cause
1653          * an error. */
1654         if (size % 2)
1655                 plen = 1;
1656         else
1657                 plen = 2;
1658
1659         taal_set_update_window(td, x, y, w, h);
1660
1661         r = dsi_vc_set_max_rx_packet_size(dssdev, td->channel, plen);
1662         if (r)
1663                 goto err2;
1664
1665         while (buf_used < size) {
1666                 u8 dcs_cmd = first ? 0x2e : 0x3e;
1667                 first = 0;
1668
1669                 r = dsi_vc_dcs_read(dssdev, td->channel, dcs_cmd,
1670                                 buf + buf_used, size - buf_used);
1671
1672                 if (r < 0) {
1673                         dev_err(&dssdev->dev, "read error\n");
1674                         goto err3;
1675                 }
1676
1677                 buf_used += r;
1678
1679                 if (r < plen) {
1680                         dev_err(&dssdev->dev, "short read\n");
1681                         break;
1682                 }
1683
1684                 if (signal_pending(current)) {
1685                         dev_err(&dssdev->dev, "signal pending, "
1686                                         "aborting memory read\n");
1687                         r = -ERESTARTSYS;
1688                         goto err3;
1689                 }
1690         }
1691
1692         r = buf_used;
1693
1694 err3:
1695         dsi_vc_set_max_rx_packet_size(dssdev, td->channel, 1);
1696 err2:
1697         dsi_bus_unlock(dssdev);
1698 err1:
1699         mutex_unlock(&td->lock);
1700         return r;
1701 }
1702
1703 static void taal_ulps_work(struct work_struct *work)
1704 {
1705         struct taal_data *td = container_of(work, struct taal_data,
1706                         ulps_work.work);
1707         struct omap_dss_device *dssdev = td->dssdev;
1708
1709         mutex_lock(&td->lock);
1710
1711         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !td->enabled) {
1712                 mutex_unlock(&td->lock);
1713                 return;
1714         }
1715
1716         dsi_bus_lock(dssdev);
1717
1718         taal_enter_ulps(dssdev);
1719
1720         dsi_bus_unlock(dssdev);
1721         mutex_unlock(&td->lock);
1722 }
1723
1724 static void taal_esd_work(struct work_struct *work)
1725 {
1726         struct taal_data *td = container_of(work, struct taal_data,
1727                         esd_work.work);
1728         struct omap_dss_device *dssdev = td->dssdev;
1729         struct nokia_dsi_panel_data *panel_data = get_panel_data(dssdev);
1730         u8 state1, state2;
1731         int r;
1732
1733         mutex_lock(&td->lock);
1734
1735         if (!td->enabled) {
1736                 mutex_unlock(&td->lock);
1737                 return;
1738         }
1739
1740         dsi_bus_lock(dssdev);
1741
1742         r = taal_wake_up(dssdev);
1743         if (r) {
1744                 dev_err(&dssdev->dev, "failed to exit ULPS\n");
1745                 goto err;
1746         }
1747
1748         r = taal_dcs_read_1(td, MIPI_DCS_GET_DIAGNOSTIC_RESULT, &state1);
1749         if (r) {
1750                 dev_err(&dssdev->dev, "failed to read Taal status\n");
1751                 goto err;
1752         }
1753
1754         /* Run self diagnostics */
1755         r = taal_sleep_out(td);
1756         if (r) {
1757                 dev_err(&dssdev->dev, "failed to run Taal self-diagnostics\n");
1758                 goto err;
1759         }
1760
1761         r = taal_dcs_read_1(td, MIPI_DCS_GET_DIAGNOSTIC_RESULT, &state2);
1762         if (r) {
1763                 dev_err(&dssdev->dev, "failed to read Taal status\n");
1764                 goto err;
1765         }
1766
1767         /* Each sleep out command will trigger a self diagnostic and flip
1768          * Bit6 if the test passes.
1769          */
1770         if (!((state1 ^ state2) & (1 << 6))) {
1771                 dev_err(&dssdev->dev, "LCD self diagnostics failed\n");
1772                 goto err;
1773         }
1774         /* Self-diagnostics result is also shown on TE GPIO line. We need
1775          * to re-enable TE after self diagnostics */
1776         if (td->te_enabled && panel_data->use_ext_te) {
1777                 r = taal_dcs_write_1(td, MIPI_DCS_SET_TEAR_ON, 0);
1778                 if (r)
1779                         goto err;
1780         }
1781
1782         dsi_bus_unlock(dssdev);
1783
1784         taal_queue_esd_work(dssdev);
1785
1786         mutex_unlock(&td->lock);
1787         return;
1788 err:
1789         dev_err(&dssdev->dev, "performing LCD reset\n");
1790
1791         taal_panel_reset(dssdev);
1792
1793         dsi_bus_unlock(dssdev);
1794
1795         taal_queue_esd_work(dssdev);
1796
1797         mutex_unlock(&td->lock);
1798 }
1799
1800 static struct omap_dss_driver taal_driver = {
1801         .probe          = taal_probe,
1802         .remove         = __exit_p(taal_remove),
1803
1804         .enable         = taal_enable,
1805         .disable        = taal_disable,
1806         .suspend        = taal_suspend,
1807         .resume         = taal_resume,
1808
1809         .update         = taal_update,
1810         .sync           = taal_sync,
1811
1812         .get_resolution = taal_get_resolution,
1813         .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1814
1815         .enable_te      = taal_enable_te,
1816         .get_te         = taal_get_te,
1817
1818         .set_rotate     = taal_rotate,
1819         .get_rotate     = taal_get_rotate,
1820         .set_mirror     = taal_mirror,
1821         .get_mirror     = taal_get_mirror,
1822         .run_test       = taal_run_test,
1823         .memory_read    = taal_memory_read,
1824
1825         .driver         = {
1826                 .name   = "taal",
1827                 .owner  = THIS_MODULE,
1828         },
1829 };
1830
1831 static int __init taal_init(void)
1832 {
1833         omap_dss_register_driver(&taal_driver);
1834
1835         return 0;
1836 }
1837
1838 static void __exit taal_exit(void)
1839 {
1840         omap_dss_unregister_driver(&taal_driver);
1841 }
1842
1843 module_init(taal_init);
1844 module_exit(taal_exit);
1845
1846 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
1847 MODULE_DESCRIPTION("Taal Driver");
1848 MODULE_LICENSE("GPL");