drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic DSI Command Mode panel driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   6  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   7  */
   8
   9 /* #define DEBUG */
  10
  11 #include <linux/backlight.h>
  12 #include <linux/delay.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/sched/signal.h>
  19 #include <linux/slab.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/of_device.h>
  22 #include <linux/regulator/consumer.h>
  23
  24 #include <drm/drm_connector.h>
  25
  26 #include <video/mipi_display.h>
  27 #include <video/of_display_timing.h>
  28
  29 #include "../dss/omapdss.h"
  30
  31 /* DSI Virtual channel. Hardcoded for now. */
  32 #define TCH 0
  33
  34 #define DCS_READ_NUM_ERRORS     0x05
  35 #define DCS_BRIGHTNESS          0x51
  36 #define DCS_CTRL_DISPLAY        0x53
  37 #define DCS_GET_ID1             0xda
  38 #define DCS_GET_ID2             0xdb
  39 #define DCS_GET_ID3             0xdc
  40
  41 struct panel_drv_data {
  42         struct omap_dss_device dssdev;
  43         struct omap_dss_device *src;
  44
  45         struct videomode vm;
  46
  47         struct platform_device *pdev;
  48
  49         struct mutex lock;
  50
  51         struct backlight_device *bldev;
  52         struct backlight_device *extbldev;
  53
  54         unsigned long   hw_guard_end;   /* next value of jiffies when we can
  55                                          * issue the next sleep in/out command
  56                                          */
  57         unsigned long   hw_guard_wait;  /* max guard time in jiffies */
  58
  59         /* panel HW configuration from DT or platform data */
  60         struct gpio_desc *reset_gpio;
  61         struct gpio_desc *ext_te_gpio;
  62
  63         struct regulator *vpnl;
  64         struct regulator *vddi;
  65
  66         bool use_dsi_backlight;
  67
  68         int width_mm;
  69         int height_mm;
  70
  71         struct omap_dsi_pin_config pin_config;
  72
  73         /* runtime variables */
  74         bool enabled;
  75
  76         bool te_enabled;
  77
  78         atomic_t do_update;
  79         int channel;
  80
  81         struct delayed_work te_timeout_work;
  82
  83         bool intro_printed;
  84
  85         struct workqueue_struct *workqueue;
  86
  87         bool ulps_enabled;
  88         unsigned int ulps_timeout;
  89         struct delayed_work ulps_work;
  90 };
  91
  92 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  93
  94 static irqreturn_t dsicm_te_isr(int irq, void *data);
  95 static void dsicm_te_timeout_work_callback(struct work_struct *work);
  96 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
  97
  98 static int dsicm_panel_reset(struct panel_drv_data *ddata);
  99
 100 static void dsicm_ulps_work(struct work_struct *work);
 101
 102 static void dsicm_bl_power(struct panel_drv_data *ddata, bool enable)
 103 {
 104         struct backlight_device *backlight;
 105
 106         if (ddata->bldev)
 107                 backlight = ddata->bldev;
 108         else if (ddata->extbldev)
 109                 backlight = ddata->extbldev;
 110         else
 111                 return;
 112
 113         if (enable) {
 114                 backlight->props.fb_blank = FB_BLANK_UNBLANK;
 115                 backlight->props.state = ~(BL_CORE_FBBLANK | BL_CORE_SUSPENDED);
 116                 backlight->props.power = FB_BLANK_UNBLANK;
 117         } else {
 118                 backlight->props.fb_blank = FB_BLANK_NORMAL;
 119                 backlight->props.power = FB_BLANK_POWERDOWN;
 120                 backlight->props.state |= BL_CORE_FBBLANK | BL_CORE_SUSPENDED;
 121         }
 122
 123         backlight_update_status(backlight);
 124 }
 125
 126 static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
 127 {
 128         ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
 129         ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
 130 }
 131
 132 static void hw_guard_wait(struct panel_drv_data *ddata)
 133 {
 134         unsigned long wait = ddata->hw_guard_end - jiffies;
 135
 136         if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
 137                 set_current_state(TASK_UNINTERRUPTIBLE);
 138                 schedule_timeout(wait);
 139         }
 140 }
 141
 142 static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
 143 {
 144         struct omap_dss_device *src = ddata->src;
 145         int r;
 146         u8 buf[1];
 147
 148         r = src->ops->dsi.dcs_read(src, ddata->channel, dcs_cmd, buf, 1);
 149
 150         if (r < 0)
 151                 return r;
 152
 153         *data = buf[0];
 154
 155         return 0;
 156 }
 157
 158 static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
 159 {
 160         struct omap_dss_device *src = ddata->src;
 161
 162         return src->ops->dsi.dcs_write(src, ddata->channel, &dcs_cmd, 1);
 163 }
 164
 165 static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
 166 {
 167         struct omap_dss_device *src = ddata->src;
 168         u8 buf[2] = { dcs_cmd, param };
 169
 170         return src->ops->dsi.dcs_write(src, ddata->channel, buf, 2);
 171 }
 172
 173 static int dsicm_sleep_in(struct panel_drv_data *ddata)
 174
 175 {
 176         struct omap_dss_device *src = ddata->src;
 177         u8 cmd;
 178         int r;
 179
 180         hw_guard_wait(ddata);
 181
 182         cmd = MIPI_DCS_ENTER_SLEEP_MODE;
 183         r = src->ops->dsi.dcs_write_nosync(src, ddata->channel, &cmd, 1);
 184         if (r)
 185                 return r;
 186
 187         hw_guard_start(ddata, 120);
 188
 189         usleep_range(5000, 10000);
 190
 191         return 0;
 192 }
 193
 194 static int dsicm_sleep_out(struct panel_drv_data *ddata)
 195 {
 196         int r;
 197
 198         hw_guard_wait(ddata);
 199
 200         r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
 201         if (r)
 202                 return r;
 203
 204         hw_guard_start(ddata, 120);
 205
 206         usleep_range(5000, 10000);
 207
 208         return 0;
 209 }
 210
 211 static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
 212 {
 213         int r;
 214
 215         r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
 216         if (r)
 217                 return r;
 218         r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
 219         if (r)
 220                 return r;
 221         r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
 222         if (r)
 223                 return r;
 224
 225         return 0;
 226 }
 227
 228 static int dsicm_set_update_window(struct panel_drv_data *ddata,
 229                 u16 x, u16 y, u16 w, u16 h)
 230 {
 231         struct omap_dss_device *src = ddata->src;
 232         int r;
 233         u16 x1 = x;
 234         u16 x2 = x + w - 1;
 235         u16 y1 = y;
 236         u16 y2 = y + h - 1;
 237
 238         u8 buf[5];
 239         buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
 240         buf[1] = (x1 >> 8) & 0xff;
 241         buf[2] = (x1 >> 0) & 0xff;
 242         buf[3] = (x2 >> 8) & 0xff;
 243         buf[4] = (x2 >> 0) & 0xff;
 244
 245         r = src->ops->dsi.dcs_write_nosync(src, ddata->channel, buf, sizeof(buf));
 246         if (r)
 247                 return r;
 248
 249         buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
 250         buf[1] = (y1 >> 8) & 0xff;
 251         buf[2] = (y1 >> 0) & 0xff;
 252         buf[3] = (y2 >> 8) & 0xff;
 253         buf[4] = (y2 >> 0) & 0xff;
 254
 255         r = src->ops->dsi.dcs_write_nosync(src, ddata->channel, buf, sizeof(buf));
 256         if (r)
 257                 return r;
 258
 259         src->ops->dsi.bta_sync(src, ddata->channel);
 260
 261         return r;
 262 }
 263
 264 static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
 265 {
 266         if (ddata->ulps_timeout > 0)
 267                 queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
 268                                 msecs_to_jiffies(ddata->ulps_timeout));
 269 }
 270
 271 static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
 272 {
 273         cancel_delayed_work(&ddata->ulps_work);
 274 }
 275
 276 static int dsicm_enter_ulps(struct panel_drv_data *ddata)
 277 {
 278         struct omap_dss_device *src = ddata->src;
 279         int r;
 280
 281         if (ddata->ulps_enabled)
 282                 return 0;
 283
 284         dsicm_cancel_ulps_work(ddata);
 285
 286         r = _dsicm_enable_te(ddata, false);
 287         if (r)
 288                 goto err;
 289
 290         if (ddata->ext_te_gpio)
 291                 disable_irq(gpiod_to_irq(ddata->ext_te_gpio));
 292
 293         src->ops->dsi.disable(src, false, true);
 294
 295         ddata->ulps_enabled = true;
 296
 297         return 0;
 298
 299 err:
 300         dev_err(&ddata->pdev->dev, "enter ULPS failed");
 301         dsicm_panel_reset(ddata);
 302
 303         ddata->ulps_enabled = false;
 304
 305         dsicm_queue_ulps_work(ddata);
 306
 307         return r;
 308 }
 309
 310 static int dsicm_exit_ulps(struct panel_drv_data *ddata)
 311 {
 312         struct omap_dss_device *src = ddata->src;
 313         int r;
 314
 315         if (!ddata->ulps_enabled)
 316                 return 0;
 317
 318         src->ops->enable(src);
 319         src->ops->dsi.enable_hs(src, ddata->channel, true);
 320
 321         r = _dsicm_enable_te(ddata, true);
 322         if (r) {
 323                 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
 324                 goto err2;
 325         }
 326
 327         if (ddata->ext_te_gpio)
 328                 enable_irq(gpiod_to_irq(ddata->ext_te_gpio));
 329
 330         dsicm_queue_ulps_work(ddata);
 331
 332         ddata->ulps_enabled = false;
 333
 334         return 0;
 335
 336 err2:
 337         dev_err(&ddata->pdev->dev, "failed to exit ULPS");
 338
 339         r = dsicm_panel_reset(ddata);
 340         if (!r) {
 341                 if (ddata->ext_te_gpio)
 342                         enable_irq(gpiod_to_irq(ddata->ext_te_gpio));
 343                 ddata->ulps_enabled = false;
 344         }
 345
 346         dsicm_queue_ulps_work(ddata);
 347
 348         return r;
 349 }
 350
 351 static int dsicm_wake_up(struct panel_drv_data *ddata)
 352 {
 353         if (ddata->ulps_enabled)
 354                 return dsicm_exit_ulps(ddata);
 355
 356         dsicm_cancel_ulps_work(ddata);
 357         dsicm_queue_ulps_work(ddata);
 358         return 0;
 359 }
 360
 361 static int dsicm_bl_update_status(struct backlight_device *dev)
 362 {
 363         struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
 364         struct omap_dss_device *src = ddata->src;
 365         int r = 0;
 366         int level;
 367
 368         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 369                         dev->props.power == FB_BLANK_UNBLANK)
 370                 level = dev->props.brightness;
 371         else
 372                 level = 0;
 373
 374         dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
 375
 376         mutex_lock(&ddata->lock);
 377
 378         if (ddata->enabled) {
 379                 src->ops->dsi.bus_lock(src);
 380
 381                 r = dsicm_wake_up(ddata);
 382                 if (!r)
 383                         r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
 384
 385                 src->ops->dsi.bus_unlock(src);
 386         }
 387
 388         mutex_unlock(&ddata->lock);
 389
 390         return r;
 391 }
 392
 393 static int dsicm_bl_get_intensity(struct backlight_device *dev)
 394 {
 395         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 396                         dev->props.power == FB_BLANK_UNBLANK)
 397                 return dev->props.brightness;
 398
 399         return 0;
 400 }
 401
 402 static const struct backlight_ops dsicm_bl_ops = {
 403         .get_brightness = dsicm_bl_get_intensity,
 404         .update_status  = dsicm_bl_update_status,
 405 };
 406
 407 static ssize_t dsicm_num_errors_show(struct device *dev,
 408                 struct device_attribute *attr, char *buf)
 409 {
 410         struct platform_device *pdev = to_platform_device(dev);
 411         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 412         struct omap_dss_device *src = ddata->src;
 413         u8 errors = 0;
 414         int r;
 415
 416         mutex_lock(&ddata->lock);
 417
 418         if (ddata->enabled) {
 419                 src->ops->dsi.bus_lock(src);
 420
 421                 r = dsicm_wake_up(ddata);
 422                 if (!r)
 423                         r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
 424                                         &errors);
 425
 426                 src->ops->dsi.bus_unlock(src);
 427         } else {
 428                 r = -ENODEV;
 429         }
 430
 431         mutex_unlock(&ddata->lock);
 432
 433         if (r)
 434                 return r;
 435
 436         return snprintf(buf, PAGE_SIZE, "%d\n", errors);
 437 }
 438
 439 static ssize_t dsicm_hw_revision_show(struct device *dev,
 440                 struct device_attribute *attr, char *buf)
 441 {
 442         struct platform_device *pdev = to_platform_device(dev);
 443         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 444         struct omap_dss_device *src = ddata->src;
 445         u8 id1, id2, id3;
 446         int r;
 447
 448         mutex_lock(&ddata->lock);
 449
 450         if (ddata->enabled) {
 451                 src->ops->dsi.bus_lock(src);
 452
 453                 r = dsicm_wake_up(ddata);
 454                 if (!r)
 455                         r = dsicm_get_id(ddata, &id1, &id2, &id3);
 456
 457                 src->ops->dsi.bus_unlock(src);
 458         } else {
 459                 r = -ENODEV;
 460         }
 461
 462         mutex_unlock(&ddata->lock);
 463
 464         if (r)
 465                 return r;
 466
 467         return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
 468 }
 469
 470 static ssize_t dsicm_store_ulps(struct device *dev,
 471                 struct device_attribute *attr,
 472                 const char *buf, size_t count)
 473 {
 474         struct platform_device *pdev = to_platform_device(dev);
 475         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 476         struct omap_dss_device *src = ddata->src;
 477         unsigned long t;
 478         int r;
 479
 480         r = kstrtoul(buf, 0, &t);
 481         if (r)
 482                 return r;
 483
 484         mutex_lock(&ddata->lock);
 485
 486         if (ddata->enabled) {
 487                 src->ops->dsi.bus_lock(src);
 488
 489                 if (t)
 490                         r = dsicm_enter_ulps(ddata);
 491                 else
 492                         r = dsicm_wake_up(ddata);
 493
 494                 src->ops->dsi.bus_unlock(src);
 495         }
 496
 497         mutex_unlock(&ddata->lock);
 498
 499         if (r)
 500                 return r;
 501
 502         return count;
 503 }
 504
 505 static ssize_t dsicm_show_ulps(struct device *dev,
 506                 struct device_attribute *attr,
 507                 char *buf)
 508 {
 509         struct platform_device *pdev = to_platform_device(dev);
 510         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 511         unsigned int t;
 512
 513         mutex_lock(&ddata->lock);
 514         t = ddata->ulps_enabled;
 515         mutex_unlock(&ddata->lock);
 516
 517         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 518 }
 519
 520 static ssize_t dsicm_store_ulps_timeout(struct device *dev,
 521                 struct device_attribute *attr,
 522                 const char *buf, size_t count)
 523 {
 524         struct platform_device *pdev = to_platform_device(dev);
 525         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 526         struct omap_dss_device *src = ddata->src;
 527         unsigned long t;
 528         int r;
 529
 530         r = kstrtoul(buf, 0, &t);
 531         if (r)
 532                 return r;
 533
 534         mutex_lock(&ddata->lock);
 535         ddata->ulps_timeout = t;
 536
 537         if (ddata->enabled) {
 538                 /* dsicm_wake_up will restart the timer */
 539                 src->ops->dsi.bus_lock(src);
 540                 r = dsicm_wake_up(ddata);
 541                 src->ops->dsi.bus_unlock(src);
 542         }
 543
 544         mutex_unlock(&ddata->lock);
 545
 546         if (r)
 547                 return r;
 548
 549         return count;
 550 }
 551
 552 static ssize_t dsicm_show_ulps_timeout(struct device *dev,
 553                 struct device_attribute *attr,
 554                 char *buf)
 555 {
 556         struct platform_device *pdev = to_platform_device(dev);
 557         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 558         unsigned int t;
 559
 560         mutex_lock(&ddata->lock);
 561         t = ddata->ulps_timeout;
 562         mutex_unlock(&ddata->lock);
 563
 564         return snprintf(buf, PAGE_SIZE, "%u\n", t);
 565 }
 566
 567 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
 568 static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
 569 static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
 570                 dsicm_show_ulps, dsicm_store_ulps);
 571 static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
 572                 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
 573
 574 static struct attribute *dsicm_attrs[] = {
 575         &dev_attr_num_dsi_errors.attr,
 576         &dev_attr_hw_revision.attr,
 577         &dev_attr_ulps.attr,
 578         &dev_attr_ulps_timeout.attr,
 579         NULL,
 580 };
 581
 582 static const struct attribute_group dsicm_attr_group = {
 583         .attrs = dsicm_attrs,
 584 };
 585
 586 static void dsicm_hw_reset(struct panel_drv_data *ddata)
 587 {
 588         gpiod_set_value(ddata->reset_gpio, 1);
 589         udelay(10);
 590         /* reset the panel */
 591         gpiod_set_value(ddata->reset_gpio, 0);
 592         /* assert reset */
 593         udelay(10);
 594         gpiod_set_value(ddata->reset_gpio, 1);
 595         /* wait after releasing reset */
 596         usleep_range(5000, 10000);
 597 }
 598
 599 static int dsicm_power_on(struct panel_drv_data *ddata)
 600 {
 601         struct omap_dss_device *src = ddata->src;
 602         u8 id1, id2, id3;
 603         int r;
 604         struct omap_dss_dsi_config dsi_config = {
 605                 .mode = OMAP_DSS_DSI_CMD_MODE,
 606                 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
 607                 .vm = &ddata->vm,
 608                 .hs_clk_min = 150000000,
 609                 .hs_clk_max = 300000000,
 610                 .lp_clk_min = 7000000,
 611                 .lp_clk_max = 10000000,
 612         };
 613
 614         if (ddata->vpnl) {
 615                 r = regulator_enable(ddata->vpnl);
 616                 if (r) {
 617                         dev_err(&ddata->pdev->dev,
 618                                 "failed to enable VPNL: %d\n", r);
 619                         return r;
 620                 }
 621         }
 622
 623         if (ddata->vddi) {
 624                 r = regulator_enable(ddata->vddi);
 625                 if (r) {
 626                         dev_err(&ddata->pdev->dev,
 627                                 "failed to enable VDDI: %d\n", r);
 628                         goto err_vpnl;
 629                 }
 630         }
 631
 632         if (ddata->pin_config.num_pins > 0) {
 633                 r = src->ops->dsi.configure_pins(src, &ddata->pin_config);
 634                 if (r) {
 635                         dev_err(&ddata->pdev->dev,
 636                                 "failed to configure DSI pins\n");
 637                         goto err_vddi;
 638                 }
 639         }
 640
 641         r = src->ops->dsi.set_config(src, &dsi_config);
 642         if (r) {
 643                 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
 644                 goto err_vddi;
 645         }
 646
 647         src->ops->enable(src);
 648
 649         dsicm_hw_reset(ddata);
 650
 651         src->ops->dsi.enable_hs(src, ddata->channel, false);
 652
 653         r = dsicm_sleep_out(ddata);
 654         if (r)
 655                 goto err;
 656
 657         r = dsicm_get_id(ddata, &id1, &id2, &id3);
 658         if (r)
 659                 goto err;
 660
 661         r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
 662         if (r)
 663                 goto err;
 664
 665         r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
 666                         (1<<2) | (1<<5));       /* BL | BCTRL */
 667         if (r)
 668                 goto err;
 669
 670         r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
 671                 MIPI_DCS_PIXEL_FMT_24BIT);
 672         if (r)
 673                 goto err;
 674
 675         r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
 676         if (r)
 677                 goto err;
 678
 679         r = _dsicm_enable_te(ddata, ddata->te_enabled);
 680         if (r)
 681                 goto err;
 682
 683         r = src->ops->dsi.enable_video_output(src, ddata->channel);
 684         if (r)
 685                 goto err;
 686
 687         ddata->enabled = 1;
 688
 689         if (!ddata->intro_printed) {
 690                 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
 691                         id1, id2, id3);
 692                 ddata->intro_printed = true;
 693         }
 694
 695         src->ops->dsi.enable_hs(src, ddata->channel, true);
 696
 697         return 0;
 698 err:
 699         dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
 700
 701         dsicm_hw_reset(ddata);
 702
 703         src->ops->dsi.disable(src, true, false);
 704 err_vddi:
 705         if (ddata->vddi)
 706                 regulator_disable(ddata->vddi);
 707 err_vpnl:
 708         if (ddata->vpnl)
 709                 regulator_disable(ddata->vpnl);
 710
 711         return r;
 712 }
 713
 714 static void dsicm_power_off(struct panel_drv_data *ddata)
 715 {
 716         struct omap_dss_device *src = ddata->src;
 717         int r;
 718
 719         src->ops->dsi.disable_video_output(src, ddata->channel);
 720
 721         r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
 722         if (!r)
 723                 r = dsicm_sleep_in(ddata);
 724
 725         if (r) {
 726                 dev_err(&ddata->pdev->dev,
 727                                 "error disabling panel, issuing HW reset\n");
 728                 dsicm_hw_reset(ddata);
 729         }
 730
 731         src->ops->dsi.disable(src, true, false);
 732
 733         if (ddata->vddi)
 734                 regulator_disable(ddata->vddi);
 735         if (ddata->vpnl)
 736                 regulator_disable(ddata->vpnl);
 737
 738         ddata->enabled = 0;
 739 }
 740
 741 static int dsicm_panel_reset(struct panel_drv_data *ddata)
 742 {
 743         dev_err(&ddata->pdev->dev, "performing LCD reset\n");
 744
 745         dsicm_power_off(ddata);
 746         dsicm_hw_reset(ddata);
 747         return dsicm_power_on(ddata);
 748 }
 749
 750 static int dsicm_connect(struct omap_dss_device *src,
 751                          struct omap_dss_device *dst)
 752 {
 753         struct panel_drv_data *ddata = to_panel_data(dst);
 754         struct device *dev = &ddata->pdev->dev;
 755         int r;
 756
 757         r = src->ops->dsi.request_vc(src, &ddata->channel);
 758         if (r) {
 759                 dev_err(dev, "failed to get virtual channel\n");
 760                 return r;
 761         }
 762
 763         r = src->ops->dsi.set_vc_id(src, ddata->channel, TCH);
 764         if (r) {
 765                 dev_err(dev, "failed to set VC_ID\n");
 766                 src->ops->dsi.release_vc(src, ddata->channel);
 767                 return r;
 768         }
 769
 770         ddata->src = src;
 771         return 0;
 772 }
 773
 774 static void dsicm_disconnect(struct omap_dss_device *src,
 775                              struct omap_dss_device *dst)
 776 {
 777         struct panel_drv_data *ddata = to_panel_data(dst);
 778
 779         src->ops->dsi.release_vc(src, ddata->channel);
 780         ddata->src = NULL;
 781 }
 782
 783 static void dsicm_enable(struct omap_dss_device *dssdev)
 784 {
 785         struct panel_drv_data *ddata = to_panel_data(dssdev);
 786         struct omap_dss_device *src = ddata->src;
 787         int r;
 788
 789         mutex_lock(&ddata->lock);
 790
 791         src->ops->dsi.bus_lock(src);
 792
 793         r = dsicm_power_on(ddata);
 794
 795         src->ops->dsi.bus_unlock(src);
 796
 797         if (r)
 798                 goto err;
 799
 800         mutex_unlock(&ddata->lock);
 801
 802         dsicm_bl_power(ddata, true);
 803
 804         return;
 805 err:
 806         dev_dbg(&ddata->pdev->dev, "enable failed (%d)\n", r);
 807         mutex_unlock(&ddata->lock);
 808 }
 809
 810 static void dsicm_disable(struct omap_dss_device *dssdev)
 811 {
 812         struct panel_drv_data *ddata = to_panel_data(dssdev);
 813         struct omap_dss_device *src = ddata->src;
 814         int r;
 815
 816         dsicm_bl_power(ddata, false);
 817
 818         mutex_lock(&ddata->lock);
 819
 820         dsicm_cancel_ulps_work(ddata);
 821
 822         src->ops->dsi.bus_lock(src);
 823
 824         r = dsicm_wake_up(ddata);
 825         if (!r)
 826                 dsicm_power_off(ddata);
 827
 828         src->ops->dsi.bus_unlock(src);
 829
 830         mutex_unlock(&ddata->lock);
 831 }
 832
 833 static void dsicm_framedone_cb(int err, void *data)
 834 {
 835         struct panel_drv_data *ddata = data;
 836         struct omap_dss_device *src = ddata->src;
 837
 838         dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
 839         src->ops->dsi.bus_unlock(src);
 840 }
 841
 842 static irqreturn_t dsicm_te_isr(int irq, void *data)
 843 {
 844         struct panel_drv_data *ddata = data;
 845         struct omap_dss_device *src = ddata->src;
 846         int old;
 847         int r;
 848
 849         old = atomic_cmpxchg(&ddata->do_update, 1, 0);
 850
 851         if (old) {
 852                 cancel_delayed_work(&ddata->te_timeout_work);
 853
 854                 r = src->ops->dsi.update(src, ddata->channel, dsicm_framedone_cb,
 855                                 ddata);
 856                 if (r)
 857                         goto err;
 858         }
 859
 860         return IRQ_HANDLED;
 861 err:
 862         dev_err(&ddata->pdev->dev, "start update failed\n");
 863         src->ops->dsi.bus_unlock(src);
 864         return IRQ_HANDLED;
 865 }
 866
 867 static void dsicm_te_timeout_work_callback(struct work_struct *work)
 868 {
 869         struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
 870                                         te_timeout_work.work);
 871         struct omap_dss_device *src = ddata->src;
 872
 873         dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
 874
 875         atomic_set(&ddata->do_update, 0);
 876         src->ops->dsi.bus_unlock(src);
 877 }
 878
 879 static int dsicm_update(struct omap_dss_device *dssdev,
 880                                     u16 x, u16 y, u16 w, u16 h)
 881 {
 882         struct panel_drv_data *ddata = to_panel_data(dssdev);
 883         struct omap_dss_device *src = ddata->src;
 884         int r;
 885
 886         dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
 887
 888         mutex_lock(&ddata->lock);
 889         src->ops->dsi.bus_lock(src);
 890
 891         r = dsicm_wake_up(ddata);
 892         if (r)
 893                 goto err;
 894
 895         if (!ddata->enabled) {
 896                 r = 0;
 897                 goto err;
 898         }
 899
 900         /* XXX no need to send this every frame, but dsi break if not done */
 901         r = dsicm_set_update_window(ddata, 0, 0, ddata->vm.hactive,
 902                                     ddata->vm.vactive);
 903         if (r)
 904                 goto err;
 905
 906         if (ddata->te_enabled && ddata->ext_te_gpio) {
 907                 schedule_delayed_work(&ddata->te_timeout_work,
 908                                 msecs_to_jiffies(250));
 909                 atomic_set(&ddata->do_update, 1);
 910         } else {
 911                 r = src->ops->dsi.update(src, ddata->channel, dsicm_framedone_cb,
 912                                 ddata);
 913                 if (r)
 914                         goto err;
 915         }
 916
 917         /* note: no bus_unlock here. unlock is src framedone_cb */
 918         mutex_unlock(&ddata->lock);
 919         return 0;
 920 err:
 921         src->ops->dsi.bus_unlock(src);
 922         mutex_unlock(&ddata->lock);
 923         return r;
 924 }
 925
 926 static int dsicm_sync(struct omap_dss_device *dssdev)
 927 {
 928         struct panel_drv_data *ddata = to_panel_data(dssdev);
 929         struct omap_dss_device *src = ddata->src;
 930
 931         dev_dbg(&ddata->pdev->dev, "sync\n");
 932
 933         mutex_lock(&ddata->lock);
 934         src->ops->dsi.bus_lock(src);
 935         src->ops->dsi.bus_unlock(src);
 936         mutex_unlock(&ddata->lock);
 937
 938         dev_dbg(&ddata->pdev->dev, "sync done\n");
 939
 940         return 0;
 941 }
 942
 943 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
 944 {
 945         struct omap_dss_device *src = ddata->src;
 946         int r;
 947
 948         if (enable)
 949                 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
 950         else
 951                 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
 952
 953         if (!ddata->ext_te_gpio)
 954                 src->ops->dsi.enable_te(src, enable);
 955
 956         /* possible panel bug */
 957         msleep(100);
 958
 959         return r;
 960 }
 961
 962 static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
 963 {
 964         struct panel_drv_data *ddata = to_panel_data(dssdev);
 965         struct omap_dss_device *src = ddata->src;
 966         int r;
 967
 968         mutex_lock(&ddata->lock);
 969
 970         if (ddata->te_enabled == enable)
 971                 goto end;
 972
 973         src->ops->dsi.bus_lock(src);
 974
 975         if (ddata->enabled) {
 976                 r = dsicm_wake_up(ddata);
 977                 if (r)
 978                         goto err;
 979
 980                 r = _dsicm_enable_te(ddata, enable);
 981                 if (r)
 982                         goto err;
 983         }
 984
 985         ddata->te_enabled = enable;
 986
 987         src->ops->dsi.bus_unlock(src);
 988 end:
 989         mutex_unlock(&ddata->lock);
 990
 991         return 0;
 992 err:
 993         src->ops->dsi.bus_unlock(src);
 994         mutex_unlock(&ddata->lock);
 995
 996         return r;
 997 }
 998
 999 static int dsicm_get_te(struct omap_dss_device *dssdev)
1000 {
1001         struct panel_drv_data *ddata = to_panel_data(dssdev);
1002         int r;
1003
1004         mutex_lock(&ddata->lock);
1005         r = ddata->te_enabled;
1006         mutex_unlock(&ddata->lock);
1007
1008         return r;
1009 }
1010
1011 static int dsicm_memory_read(struct omap_dss_device *dssdev,
1012                 void *buf, size_t size,
1013                 u16 x, u16 y, u16 w, u16 h)
1014 {
1015         struct panel_drv_data *ddata = to_panel_data(dssdev);
1016         struct omap_dss_device *src = ddata->src;
1017         int r;
1018         int first = 1;
1019         int plen;
1020         unsigned int buf_used = 0;
1021
1022         if (size < w * h * 3)
1023                 return -ENOMEM;
1024
1025         mutex_lock(&ddata->lock);
1026
1027         if (!ddata->enabled) {
1028                 r = -ENODEV;
1029                 goto err1;
1030         }
1031
1032         size = min((u32)w * h * 3,
1033                    ddata->vm.hactive * ddata->vm.vactive * 3);
1034
1035         src->ops->dsi.bus_lock(src);
1036
1037         r = dsicm_wake_up(ddata);
1038         if (r)
1039                 goto err2;
1040
1041         /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1042          * use short packets. plen 32 works, but bigger packets seem to cause
1043          * an error. */
1044         if (size % 2)
1045                 plen = 1;
1046         else
1047                 plen = 2;
1048
1049         dsicm_set_update_window(ddata, x, y, w, h);
1050
1051         r = src->ops->dsi.set_max_rx_packet_size(src, ddata->channel, plen);
1052         if (r)
1053                 goto err2;
1054
1055         while (buf_used < size) {
1056                 u8 dcs_cmd = first ? 0x2e : 0x3e;
1057                 first = 0;
1058
1059                 r = src->ops->dsi.dcs_read(src, ddata->channel, dcs_cmd,
1060                                 buf + buf_used, size - buf_used);
1061
1062                 if (r < 0) {
1063                         dev_err(dssdev->dev, "read error\n");
1064                         goto err3;
1065                 }
1066
1067                 buf_used += r;
1068
1069                 if (r < plen) {
1070                         dev_err(&ddata->pdev->dev, "short read\n");
1071                         break;
1072                 }
1073
1074                 if (signal_pending(current)) {
1075                         dev_err(&ddata->pdev->dev, "signal pending, "
1076                                         "aborting memory read\n");
1077                         r = -ERESTARTSYS;
1078                         goto err3;
1079                 }
1080         }
1081
1082         r = buf_used;
1083
1084 err3:
1085         src->ops->dsi.set_max_rx_packet_size(src, ddata->channel, 1);
1086 err2:
1087         src->ops->dsi.bus_unlock(src);
1088 err1:
1089         mutex_unlock(&ddata->lock);
1090         return r;
1091 }
1092
1093 static void dsicm_ulps_work(struct work_struct *work)
1094 {
1095         struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1096                         ulps_work.work);
1097         struct omap_dss_device *dssdev = &ddata->dssdev;
1098         struct omap_dss_device *src = ddata->src;
1099
1100         mutex_lock(&ddata->lock);
1101
1102         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1103                 mutex_unlock(&ddata->lock);
1104                 return;
1105         }
1106
1107         src->ops->dsi.bus_lock(src);
1108
1109         dsicm_enter_ulps(ddata);
1110
1111         src->ops->dsi.bus_unlock(src);
1112         mutex_unlock(&ddata->lock);
1113 }
1114
1115 static int dsicm_get_modes(struct omap_dss_device *dssdev,
1116                            struct drm_connector *connector)
1117 {
1118         struct panel_drv_data *ddata = to_panel_data(dssdev);
1119
1120         connector->display_info.width_mm = ddata->width_mm;
1121         connector->display_info.height_mm = ddata->height_mm;
1122
1123         return omapdss_display_get_modes(connector, &ddata->vm);
1124 }
1125
1126 static int dsicm_check_timings(struct omap_dss_device *dssdev,
1127                                struct drm_display_mode *mode)
1128 {
1129         struct panel_drv_data *ddata = to_panel_data(dssdev);
1130         int ret = 0;
1131
1132         if (mode->hdisplay != ddata->vm.hactive)
1133                 ret = -EINVAL;
1134
1135         if (mode->vdisplay != ddata->vm.vactive)
1136                 ret = -EINVAL;
1137
1138         if (ret) {
1139                 dev_warn(dssdev->dev, "wrong resolution: %d x %d",
1140                          mode->hdisplay, mode->vdisplay);
1141                 dev_warn(dssdev->dev, "panel resolution: %d x %d",
1142                          ddata->vm.hactive, ddata->vm.vactive);
1143         }
1144
1145         return ret;
1146 }
1147
1148 static const struct omap_dss_device_ops dsicm_ops = {
1149         .connect        = dsicm_connect,
1150         .disconnect     = dsicm_disconnect,
1151
1152         .enable         = dsicm_enable,
1153         .disable        = dsicm_disable,
1154
1155         .get_modes      = dsicm_get_modes,
1156         .check_timings  = dsicm_check_timings,
1157 };
1158
1159 static const struct omap_dss_driver dsicm_dss_driver = {
1160         .update         = dsicm_update,
1161         .sync           = dsicm_sync,
1162
1163         .enable_te      = dsicm_enable_te,
1164         .get_te         = dsicm_get_te,
1165
1166         .memory_read    = dsicm_memory_read,
1167 };
1168
1169 static int dsicm_probe_of(struct platform_device *pdev)
1170 {
1171         struct device_node *node = pdev->dev.of_node;
1172         struct device_node *backlight;
1173         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1174         struct display_timing timing;
1175         int err;
1176
1177         ddata->reset_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
1178         if (IS_ERR(ddata->reset_gpio)) {
1179                 err = PTR_ERR(ddata->reset_gpio);
1180                 dev_err(&pdev->dev, "reset gpio request failed: %d", err);
1181                 return err;
1182         }
1183
1184         ddata->ext_te_gpio = devm_gpiod_get_optional(&pdev->dev, "te",
1185                                                      GPIOD_IN);
1186         if (IS_ERR(ddata->ext_te_gpio)) {
1187                 err = PTR_ERR(ddata->ext_te_gpio);
1188                 dev_err(&pdev->dev, "TE gpio request failed: %d", err);
1189                 return err;
1190         }
1191
1192         err = of_get_display_timing(node, "panel-timing", &timing);
1193         if (!err) {
1194                 videomode_from_timing(&timing, &ddata->vm);
1195                 if (!ddata->vm.pixelclock)
1196                         ddata->vm.pixelclock =
1197                                 ddata->vm.hactive * ddata->vm.vactive * 60;
1198         } else {
1199                 dev_warn(&pdev->dev,
1200                          "failed to get video timing, using defaults\n");
1201         }
1202
1203         ddata->width_mm = 0;
1204         of_property_read_u32(node, "width-mm", &ddata->width_mm);
1205
1206         ddata->height_mm = 0;
1207         of_property_read_u32(node, "height-mm", &ddata->height_mm);
1208
1209         ddata->vpnl = devm_regulator_get_optional(&pdev->dev, "vpnl");
1210         if (IS_ERR(ddata->vpnl)) {
1211                 err = PTR_ERR(ddata->vpnl);
1212                 if (err == -EPROBE_DEFER)
1213                         return err;
1214                 ddata->vpnl = NULL;
1215         }
1216
1217         ddata->vddi = devm_regulator_get_optional(&pdev->dev, "vddi");
1218         if (IS_ERR(ddata->vddi)) {
1219                 err = PTR_ERR(ddata->vddi);
1220                 if (err == -EPROBE_DEFER)
1221                         return err;
1222                 ddata->vddi = NULL;
1223         }
1224
1225         backlight = of_parse_phandle(node, "backlight", 0);
1226         if (backlight) {
1227                 ddata->extbldev = of_find_backlight_by_node(backlight);
1228                 of_node_put(backlight);
1229
1230                 if (!ddata->extbldev)
1231                         return -EPROBE_DEFER;
1232         } else {
1233                 /* assume native backlight support */
1234                 ddata->use_dsi_backlight = true;
1235         }
1236
1237         /* TODO: ulps */
1238
1239         return 0;
1240 }
1241
1242 static int dsicm_probe(struct platform_device *pdev)
1243 {
1244         struct panel_drv_data *ddata;
1245         struct backlight_device *bldev = NULL;
1246         struct device *dev = &pdev->dev;
1247         struct omap_dss_device *dssdev;
1248         int r;
1249
1250         dev_dbg(dev, "probe\n");
1251
1252         ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1253         if (!ddata)
1254                 return -ENOMEM;
1255
1256         platform_set_drvdata(pdev, ddata);
1257         ddata->pdev = pdev;
1258
1259         ddata->vm.hactive = 864;
1260         ddata->vm.vactive = 480;
1261         ddata->vm.pixelclock = 864 * 480 * 60;
1262
1263         r = dsicm_probe_of(pdev);
1264         if (r)
1265                 return r;
1266
1267         dssdev = &ddata->dssdev;
1268         dssdev->dev = dev;
1269         dssdev->ops = &dsicm_ops;
1270         dssdev->driver = &dsicm_dss_driver;
1271         dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1272         dssdev->display = true;
1273         dssdev->owner = THIS_MODULE;
1274         dssdev->of_ports = BIT(0);
1275         dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
1276
1277         dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
1278                 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
1279
1280         omapdss_display_init(dssdev);
1281         omapdss_device_register(dssdev);
1282
1283         mutex_init(&ddata->lock);
1284
1285         atomic_set(&ddata->do_update, 0);
1286
1287         if (ddata->ext_te_gpio) {
1288                 r = devm_request_irq(dev, gpiod_to_irq(ddata->ext_te_gpio),
1289                                 dsicm_te_isr,
1290                                 IRQF_TRIGGER_RISING,
1291                                 "taal vsync", ddata);
1292
1293                 if (r) {
1294                         dev_err(dev, "IRQ request failed\n");
1295                         goto err_reg;
1296                 }
1297
1298                 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1299                                         dsicm_te_timeout_work_callback);
1300
1301                 dev_dbg(dev, "Using GPIO TE\n");
1302         }
1303
1304         ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
1305         if (!ddata->workqueue) {
1306                 r = -ENOMEM;
1307                 goto err_reg;
1308         }
1309         INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1310
1311         dsicm_hw_reset(ddata);
1312
1313         if (ddata->use_dsi_backlight) {
1314                 struct backlight_properties props = { 0 };
1315                 props.max_brightness = 255;
1316                 props.type = BACKLIGHT_RAW;
1317
1318                 bldev = devm_backlight_device_register(dev, dev_name(dev),
1319                         dev, ddata, &dsicm_bl_ops, &props);
1320                 if (IS_ERR(bldev)) {
1321                         r = PTR_ERR(bldev);
1322                         goto err_bl;
1323                 }
1324
1325                 ddata->bldev = bldev;
1326         }
1327
1328         r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1329         if (r) {
1330                 dev_err(dev, "failed to create sysfs files\n");
1331                 goto err_bl;
1332         }
1333
1334         return 0;
1335
1336 err_bl:
1337         destroy_workqueue(ddata->workqueue);
1338 err_reg:
1339         if (ddata->extbldev)
1340                 put_device(&ddata->extbldev->dev);
1341
1342         return r;
1343 }
1344
1345 static int __exit dsicm_remove(struct platform_device *pdev)
1346 {
1347         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1348         struct omap_dss_device *dssdev = &ddata->dssdev;
1349
1350         dev_dbg(&pdev->dev, "remove\n");
1351
1352         omapdss_device_unregister(dssdev);
1353
1354         if (omapdss_device_is_enabled(dssdev))
1355                 dsicm_disable(dssdev);
1356         omapdss_device_disconnect(ddata->src, dssdev);
1357
1358         sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1359
1360         if (ddata->extbldev)
1361                 put_device(&ddata->extbldev->dev);
1362
1363         dsicm_cancel_ulps_work(ddata);
1364         destroy_workqueue(ddata->workqueue);
1365
1366         /* reset, to be sure that the panel is in a valid state */
1367         dsicm_hw_reset(ddata);
1368
1369         return 0;
1370 }
1371
1372 static const struct of_device_id dsicm_of_match[] = {
1373         { .compatible = "omapdss,panel-dsi-cm", },
1374         {},
1375 };
1376
1377 MODULE_DEVICE_TABLE(of, dsicm_of_match);
1378
1379 static struct platform_driver dsicm_driver = {
1380         .probe = dsicm_probe,
1381         .remove = __exit_p(dsicm_remove),
1382         .driver = {
1383                 .name = "panel-dsi-cm",
1384                 .of_match_table = dsicm_of_match,
1385                 .suppress_bind_attrs = true,
1386         },
1387 };
1388
1389 module_platform_driver(dsicm_driver);
1390
1391 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1392 MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1393 MODULE_LICENSE("GPL");