1 /* 2 * Generic DSI Command Mode panel driver 3 * 4 * Copyright (C) 2013 Texas Instruments 5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 */ 11 12 /* #define DEBUG */ 13 14 #include <linux/backlight.h> 15 #include <linux/delay.h> 16 #include <linux/fb.h> 17 #include <linux/gpio.h> 18 #include <linux/interrupt.h> 19 #include <linux/jiffies.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 #include <linux/sched/signal.h> 23 #include <linux/slab.h> 24 #include <linux/workqueue.h> 25 #include <linux/of_device.h> 26 #include <linux/of_gpio.h> 27 28 #include <video/omapfb_dss.h> 29 #include <video/mipi_display.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 *in; 44 45 struct omap_video_timings timings; 46 47 struct platform_device *pdev; 48 49 struct mutex lock; 50 51 struct backlight_device *bldev; 52 53 unsigned long hw_guard_end; /* next value of jiffies when we can 54 * issue the next sleep in/out command 55 */ 56 unsigned long hw_guard_wait; /* max guard time in jiffies */ 57 58 /* panel HW configuration from DT or platform data */ 59 int reset_gpio; 60 int ext_te_gpio; 61 62 bool use_dsi_backlight; 63 64 struct omap_dsi_pin_config pin_config; 65 66 /* runtime variables */ 67 bool enabled; 68 69 bool te_enabled; 70 71 atomic_t do_update; 72 int channel; 73 74 struct delayed_work te_timeout_work; 75 76 bool intro_printed; 77 78 bool ulps_enabled; 79 unsigned ulps_timeout; 80 struct delayed_work ulps_work; 81 }; 82 83 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) 84 85 static irqreturn_t dsicm_te_isr(int irq, void *data); 86 static void dsicm_te_timeout_work_callback(struct work_struct *work); 87 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable); 88 89 static int dsicm_panel_reset(struct panel_drv_data *ddata); 90 91 static void dsicm_ulps_work(struct work_struct *work); 92 93 static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec) 94 { 95 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec); 96 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait; 97 } 98 99 static void hw_guard_wait(struct panel_drv_data *ddata) 100 { 101 unsigned long wait = ddata->hw_guard_end - jiffies; 102 103 if ((long)wait > 0 && time_before_eq(wait, ddata->hw_guard_wait)) { 104 set_current_state(TASK_UNINTERRUPTIBLE); 105 schedule_timeout(wait); 106 } 107 } 108 109 static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data) 110 { 111 struct omap_dss_device *in = ddata->in; 112 int r; 113 u8 buf[1]; 114 115 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1); 116 117 if (r < 0) 118 return r; 119 120 *data = buf[0]; 121 122 return 0; 123 } 124 125 static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd) 126 { 127 struct omap_dss_device *in = ddata->in; 128 return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1); 129 } 130 131 static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param) 132 { 133 struct omap_dss_device *in = ddata->in; 134 u8 buf[2] = { dcs_cmd, param }; 135 136 return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2); 137 } 138 139 static int dsicm_sleep_in(struct panel_drv_data *ddata) 140 141 { 142 struct omap_dss_device *in = ddata->in; 143 u8 cmd; 144 int r; 145 146 hw_guard_wait(ddata); 147 148 cmd = MIPI_DCS_ENTER_SLEEP_MODE; 149 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1); 150 if (r) 151 return r; 152 153 hw_guard_start(ddata, 120); 154 155 usleep_range(5000, 10000); 156 157 return 0; 158 } 159 160 static int dsicm_sleep_out(struct panel_drv_data *ddata) 161 { 162 int r; 163 164 hw_guard_wait(ddata); 165 166 r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE); 167 if (r) 168 return r; 169 170 hw_guard_start(ddata, 120); 171 172 usleep_range(5000, 10000); 173 174 return 0; 175 } 176 177 static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3) 178 { 179 int r; 180 181 r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1); 182 if (r) 183 return r; 184 r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2); 185 if (r) 186 return r; 187 r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3); 188 if (r) 189 return r; 190 191 return 0; 192 } 193 194 static int dsicm_set_update_window(struct panel_drv_data *ddata, 195 u16 x, u16 y, u16 w, u16 h) 196 { 197 struct omap_dss_device *in = ddata->in; 198 int r; 199 u16 x1 = x; 200 u16 x2 = x + w - 1; 201 u16 y1 = y; 202 u16 y2 = y + h - 1; 203 204 u8 buf[5]; 205 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS; 206 buf[1] = (x1 >> 8) & 0xff; 207 buf[2] = (x1 >> 0) & 0xff; 208 buf[3] = (x2 >> 8) & 0xff; 209 buf[4] = (x2 >> 0) & 0xff; 210 211 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf)); 212 if (r) 213 return r; 214 215 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS; 216 buf[1] = (y1 >> 8) & 0xff; 217 buf[2] = (y1 >> 0) & 0xff; 218 buf[3] = (y2 >> 8) & 0xff; 219 buf[4] = (y2 >> 0) & 0xff; 220 221 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf)); 222 if (r) 223 return r; 224 225 in->ops.dsi->bta_sync(in, ddata->channel); 226 227 return r; 228 } 229 230 static void dsicm_queue_ulps_work(struct panel_drv_data *ddata) 231 { 232 if (ddata->ulps_timeout > 0) 233 schedule_delayed_work(&ddata->ulps_work, 234 msecs_to_jiffies(ddata->ulps_timeout)); 235 } 236 237 static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata) 238 { 239 cancel_delayed_work(&ddata->ulps_work); 240 } 241 242 static int dsicm_enter_ulps(struct panel_drv_data *ddata) 243 { 244 struct omap_dss_device *in = ddata->in; 245 int r; 246 247 if (ddata->ulps_enabled) 248 return 0; 249 250 dsicm_cancel_ulps_work(ddata); 251 252 r = _dsicm_enable_te(ddata, false); 253 if (r) 254 goto err; 255 256 if (gpio_is_valid(ddata->ext_te_gpio)) 257 disable_irq(gpio_to_irq(ddata->ext_te_gpio)); 258 259 in->ops.dsi->disable(in, false, true); 260 261 ddata->ulps_enabled = true; 262 263 return 0; 264 265 err: 266 dev_err(&ddata->pdev->dev, "enter ULPS failed"); 267 dsicm_panel_reset(ddata); 268 269 ddata->ulps_enabled = false; 270 271 dsicm_queue_ulps_work(ddata); 272 273 return r; 274 } 275 276 static int dsicm_exit_ulps(struct panel_drv_data *ddata) 277 { 278 struct omap_dss_device *in = ddata->in; 279 int r; 280 281 if (!ddata->ulps_enabled) 282 return 0; 283 284 r = in->ops.dsi->enable(in); 285 if (r) { 286 dev_err(&ddata->pdev->dev, "failed to enable DSI\n"); 287 goto err1; 288 } 289 290 in->ops.dsi->enable_hs(in, ddata->channel, true); 291 292 r = _dsicm_enable_te(ddata, true); 293 if (r) { 294 dev_err(&ddata->pdev->dev, "failed to re-enable TE"); 295 goto err2; 296 } 297 298 if (gpio_is_valid(ddata->ext_te_gpio)) 299 enable_irq(gpio_to_irq(ddata->ext_te_gpio)); 300 301 dsicm_queue_ulps_work(ddata); 302 303 ddata->ulps_enabled = false; 304 305 return 0; 306 307 err2: 308 dev_err(&ddata->pdev->dev, "failed to exit ULPS"); 309 310 r = dsicm_panel_reset(ddata); 311 if (!r) { 312 if (gpio_is_valid(ddata->ext_te_gpio)) 313 enable_irq(gpio_to_irq(ddata->ext_te_gpio)); 314 ddata->ulps_enabled = false; 315 } 316 err1: 317 dsicm_queue_ulps_work(ddata); 318 319 return r; 320 } 321 322 static int dsicm_wake_up(struct panel_drv_data *ddata) 323 { 324 if (ddata->ulps_enabled) 325 return dsicm_exit_ulps(ddata); 326 327 dsicm_cancel_ulps_work(ddata); 328 dsicm_queue_ulps_work(ddata); 329 return 0; 330 } 331 332 static int dsicm_bl_update_status(struct backlight_device *dev) 333 { 334 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev); 335 struct omap_dss_device *in = ddata->in; 336 int r; 337 int level; 338 339 if (dev->props.fb_blank == FB_BLANK_UNBLANK && 340 dev->props.power == FB_BLANK_UNBLANK) 341 level = dev->props.brightness; 342 else 343 level = 0; 344 345 dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level); 346 347 mutex_lock(&ddata->lock); 348 349 if (ddata->enabled) { 350 in->ops.dsi->bus_lock(in); 351 352 r = dsicm_wake_up(ddata); 353 if (!r) 354 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level); 355 356 in->ops.dsi->bus_unlock(in); 357 } else { 358 r = 0; 359 } 360 361 mutex_unlock(&ddata->lock); 362 363 return r; 364 } 365 366 static int dsicm_bl_get_intensity(struct backlight_device *dev) 367 { 368 if (dev->props.fb_blank == FB_BLANK_UNBLANK && 369 dev->props.power == FB_BLANK_UNBLANK) 370 return dev->props.brightness; 371 372 return 0; 373 } 374 375 static const struct backlight_ops dsicm_bl_ops = { 376 .get_brightness = dsicm_bl_get_intensity, 377 .update_status = dsicm_bl_update_status, 378 }; 379 380 static void dsicm_get_resolution(struct omap_dss_device *dssdev, 381 u16 *xres, u16 *yres) 382 { 383 *xres = dssdev->panel.timings.x_res; 384 *yres = dssdev->panel.timings.y_res; 385 } 386 387 static ssize_t dsicm_num_errors_show(struct device *dev, 388 struct device_attribute *attr, char *buf) 389 { 390 struct platform_device *pdev = to_platform_device(dev); 391 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 392 struct omap_dss_device *in = ddata->in; 393 u8 errors = 0; 394 int r; 395 396 mutex_lock(&ddata->lock); 397 398 if (ddata->enabled) { 399 in->ops.dsi->bus_lock(in); 400 401 r = dsicm_wake_up(ddata); 402 if (!r) 403 r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS, 404 &errors); 405 406 in->ops.dsi->bus_unlock(in); 407 } else { 408 r = -ENODEV; 409 } 410 411 mutex_unlock(&ddata->lock); 412 413 if (r) 414 return r; 415 416 return snprintf(buf, PAGE_SIZE, "%d\n", errors); 417 } 418 419 static ssize_t dsicm_hw_revision_show(struct device *dev, 420 struct device_attribute *attr, char *buf) 421 { 422 struct platform_device *pdev = to_platform_device(dev); 423 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 424 struct omap_dss_device *in = ddata->in; 425 u8 id1, id2, id3; 426 int r; 427 428 mutex_lock(&ddata->lock); 429 430 if (ddata->enabled) { 431 in->ops.dsi->bus_lock(in); 432 433 r = dsicm_wake_up(ddata); 434 if (!r) 435 r = dsicm_get_id(ddata, &id1, &id2, &id3); 436 437 in->ops.dsi->bus_unlock(in); 438 } else { 439 r = -ENODEV; 440 } 441 442 mutex_unlock(&ddata->lock); 443 444 if (r) 445 return r; 446 447 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3); 448 } 449 450 static ssize_t dsicm_store_ulps(struct device *dev, 451 struct device_attribute *attr, 452 const char *buf, size_t count) 453 { 454 struct platform_device *pdev = to_platform_device(dev); 455 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 456 struct omap_dss_device *in = ddata->in; 457 unsigned long t; 458 int r; 459 460 r = kstrtoul(buf, 0, &t); 461 if (r) 462 return r; 463 464 mutex_lock(&ddata->lock); 465 466 if (ddata->enabled) { 467 in->ops.dsi->bus_lock(in); 468 469 if (t) 470 r = dsicm_enter_ulps(ddata); 471 else 472 r = dsicm_wake_up(ddata); 473 474 in->ops.dsi->bus_unlock(in); 475 } 476 477 mutex_unlock(&ddata->lock); 478 479 if (r) 480 return r; 481 482 return count; 483 } 484 485 static ssize_t dsicm_show_ulps(struct device *dev, 486 struct device_attribute *attr, 487 char *buf) 488 { 489 struct platform_device *pdev = to_platform_device(dev); 490 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 491 unsigned t; 492 493 mutex_lock(&ddata->lock); 494 t = ddata->ulps_enabled; 495 mutex_unlock(&ddata->lock); 496 497 return snprintf(buf, PAGE_SIZE, "%u\n", t); 498 } 499 500 static ssize_t dsicm_store_ulps_timeout(struct device *dev, 501 struct device_attribute *attr, 502 const char *buf, size_t count) 503 { 504 struct platform_device *pdev = to_platform_device(dev); 505 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 506 struct omap_dss_device *in = ddata->in; 507 unsigned long t; 508 int r; 509 510 r = kstrtoul(buf, 0, &t); 511 if (r) 512 return r; 513 514 mutex_lock(&ddata->lock); 515 ddata->ulps_timeout = t; 516 517 if (ddata->enabled) { 518 /* dsicm_wake_up will restart the timer */ 519 in->ops.dsi->bus_lock(in); 520 r = dsicm_wake_up(ddata); 521 in->ops.dsi->bus_unlock(in); 522 } 523 524 mutex_unlock(&ddata->lock); 525 526 if (r) 527 return r; 528 529 return count; 530 } 531 532 static ssize_t dsicm_show_ulps_timeout(struct device *dev, 533 struct device_attribute *attr, 534 char *buf) 535 { 536 struct platform_device *pdev = to_platform_device(dev); 537 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 538 unsigned t; 539 540 mutex_lock(&ddata->lock); 541 t = ddata->ulps_timeout; 542 mutex_unlock(&ddata->lock); 543 544 return snprintf(buf, PAGE_SIZE, "%u\n", t); 545 } 546 547 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL); 548 static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL); 549 static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR, 550 dsicm_show_ulps, dsicm_store_ulps); 551 static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR, 552 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout); 553 554 static struct attribute *dsicm_attrs[] = { 555 &dev_attr_num_dsi_errors.attr, 556 &dev_attr_hw_revision.attr, 557 &dev_attr_ulps.attr, 558 &dev_attr_ulps_timeout.attr, 559 NULL, 560 }; 561 562 static const struct attribute_group dsicm_attr_group = { 563 .attrs = dsicm_attrs, 564 }; 565 566 static void dsicm_hw_reset(struct panel_drv_data *ddata) 567 { 568 if (!gpio_is_valid(ddata->reset_gpio)) 569 return; 570 571 gpio_set_value(ddata->reset_gpio, 1); 572 udelay(10); 573 /* reset the panel */ 574 gpio_set_value(ddata->reset_gpio, 0); 575 /* assert reset */ 576 udelay(10); 577 gpio_set_value(ddata->reset_gpio, 1); 578 /* wait after releasing reset */ 579 usleep_range(5000, 10000); 580 } 581 582 static int dsicm_power_on(struct panel_drv_data *ddata) 583 { 584 struct omap_dss_device *in = ddata->in; 585 u8 id1, id2, id3; 586 int r; 587 struct omap_dss_dsi_config dsi_config = { 588 .mode = OMAP_DSS_DSI_CMD_MODE, 589 .pixel_format = OMAP_DSS_DSI_FMT_RGB888, 590 .timings = &ddata->timings, 591 .hs_clk_min = 150000000, 592 .hs_clk_max = 300000000, 593 .lp_clk_min = 7000000, 594 .lp_clk_max = 10000000, 595 }; 596 597 if (ddata->pin_config.num_pins > 0) { 598 r = in->ops.dsi->configure_pins(in, &ddata->pin_config); 599 if (r) { 600 dev_err(&ddata->pdev->dev, 601 "failed to configure DSI pins\n"); 602 goto err0; 603 } 604 } 605 606 r = in->ops.dsi->set_config(in, &dsi_config); 607 if (r) { 608 dev_err(&ddata->pdev->dev, "failed to configure DSI\n"); 609 goto err0; 610 } 611 612 r = in->ops.dsi->enable(in); 613 if (r) { 614 dev_err(&ddata->pdev->dev, "failed to enable DSI\n"); 615 goto err0; 616 } 617 618 dsicm_hw_reset(ddata); 619 620 in->ops.dsi->enable_hs(in, ddata->channel, false); 621 622 r = dsicm_sleep_out(ddata); 623 if (r) 624 goto err; 625 626 r = dsicm_get_id(ddata, &id1, &id2, &id3); 627 if (r) 628 goto err; 629 630 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff); 631 if (r) 632 goto err; 633 634 r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY, 635 (1<<2) | (1<<5)); /* BL | BCTRL */ 636 if (r) 637 goto err; 638 639 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT, 640 MIPI_DCS_PIXEL_FMT_24BIT); 641 if (r) 642 goto err; 643 644 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON); 645 if (r) 646 goto err; 647 648 r = _dsicm_enable_te(ddata, ddata->te_enabled); 649 if (r) 650 goto err; 651 652 r = in->ops.dsi->enable_video_output(in, ddata->channel); 653 if (r) 654 goto err; 655 656 ddata->enabled = 1; 657 658 if (!ddata->intro_printed) { 659 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n", 660 id1, id2, id3); 661 ddata->intro_printed = true; 662 } 663 664 in->ops.dsi->enable_hs(in, ddata->channel, true); 665 666 return 0; 667 err: 668 dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n"); 669 670 dsicm_hw_reset(ddata); 671 672 in->ops.dsi->disable(in, true, false); 673 err0: 674 return r; 675 } 676 677 static void dsicm_power_off(struct panel_drv_data *ddata) 678 { 679 struct omap_dss_device *in = ddata->in; 680 int r; 681 682 in->ops.dsi->disable_video_output(in, ddata->channel); 683 684 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF); 685 if (!r) 686 r = dsicm_sleep_in(ddata); 687 688 if (r) { 689 dev_err(&ddata->pdev->dev, 690 "error disabling panel, issuing HW reset\n"); 691 dsicm_hw_reset(ddata); 692 } 693 694 in->ops.dsi->disable(in, true, false); 695 696 ddata->enabled = 0; 697 } 698 699 static int dsicm_panel_reset(struct panel_drv_data *ddata) 700 { 701 dev_err(&ddata->pdev->dev, "performing LCD reset\n"); 702 703 dsicm_power_off(ddata); 704 dsicm_hw_reset(ddata); 705 return dsicm_power_on(ddata); 706 } 707 708 static int dsicm_connect(struct omap_dss_device *dssdev) 709 { 710 struct panel_drv_data *ddata = to_panel_data(dssdev); 711 struct omap_dss_device *in = ddata->in; 712 struct device *dev = &ddata->pdev->dev; 713 int r; 714 715 if (omapdss_device_is_connected(dssdev)) 716 return 0; 717 718 r = in->ops.dsi->connect(in, dssdev); 719 if (r) { 720 dev_err(dev, "Failed to connect to video source\n"); 721 return r; 722 } 723 724 r = in->ops.dsi->request_vc(ddata->in, &ddata->channel); 725 if (r) { 726 dev_err(dev, "failed to get virtual channel\n"); 727 goto err_req_vc; 728 } 729 730 r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH); 731 if (r) { 732 dev_err(dev, "failed to set VC_ID\n"); 733 goto err_vc_id; 734 } 735 736 return 0; 737 738 err_vc_id: 739 in->ops.dsi->release_vc(ddata->in, ddata->channel); 740 err_req_vc: 741 in->ops.dsi->disconnect(in, dssdev); 742 return r; 743 } 744 745 static void dsicm_disconnect(struct omap_dss_device *dssdev) 746 { 747 struct panel_drv_data *ddata = to_panel_data(dssdev); 748 struct omap_dss_device *in = ddata->in; 749 750 if (!omapdss_device_is_connected(dssdev)) 751 return; 752 753 in->ops.dsi->release_vc(in, ddata->channel); 754 in->ops.dsi->disconnect(in, dssdev); 755 } 756 757 static int dsicm_enable(struct omap_dss_device *dssdev) 758 { 759 struct panel_drv_data *ddata = to_panel_data(dssdev); 760 struct omap_dss_device *in = ddata->in; 761 int r; 762 763 dev_dbg(&ddata->pdev->dev, "enable\n"); 764 765 mutex_lock(&ddata->lock); 766 767 if (!omapdss_device_is_connected(dssdev)) { 768 r = -ENODEV; 769 goto err; 770 } 771 772 if (omapdss_device_is_enabled(dssdev)) { 773 r = 0; 774 goto err; 775 } 776 777 in->ops.dsi->bus_lock(in); 778 779 r = dsicm_power_on(ddata); 780 781 in->ops.dsi->bus_unlock(in); 782 783 if (r) 784 goto err; 785 786 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; 787 788 mutex_unlock(&ddata->lock); 789 790 return 0; 791 err: 792 dev_dbg(&ddata->pdev->dev, "enable failed\n"); 793 mutex_unlock(&ddata->lock); 794 return r; 795 } 796 797 static void dsicm_disable(struct omap_dss_device *dssdev) 798 { 799 struct panel_drv_data *ddata = to_panel_data(dssdev); 800 struct omap_dss_device *in = ddata->in; 801 int r; 802 803 dev_dbg(&ddata->pdev->dev, "disable\n"); 804 805 mutex_lock(&ddata->lock); 806 807 dsicm_cancel_ulps_work(ddata); 808 809 in->ops.dsi->bus_lock(in); 810 811 if (omapdss_device_is_enabled(dssdev)) { 812 r = dsicm_wake_up(ddata); 813 if (!r) 814 dsicm_power_off(ddata); 815 } 816 817 in->ops.dsi->bus_unlock(in); 818 819 dssdev->state = OMAP_DSS_DISPLAY_DISABLED; 820 821 mutex_unlock(&ddata->lock); 822 } 823 824 static void dsicm_framedone_cb(int err, void *data) 825 { 826 struct panel_drv_data *ddata = data; 827 struct omap_dss_device *in = ddata->in; 828 829 dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err); 830 in->ops.dsi->bus_unlock(ddata->in); 831 } 832 833 static irqreturn_t dsicm_te_isr(int irq, void *data) 834 { 835 struct panel_drv_data *ddata = data; 836 struct omap_dss_device *in = ddata->in; 837 int old; 838 int r; 839 840 old = atomic_cmpxchg(&ddata->do_update, 1, 0); 841 842 if (old) { 843 cancel_delayed_work(&ddata->te_timeout_work); 844 845 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb, 846 ddata); 847 if (r) 848 goto err; 849 } 850 851 return IRQ_HANDLED; 852 err: 853 dev_err(&ddata->pdev->dev, "start update failed\n"); 854 in->ops.dsi->bus_unlock(in); 855 return IRQ_HANDLED; 856 } 857 858 static void dsicm_te_timeout_work_callback(struct work_struct *work) 859 { 860 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data, 861 te_timeout_work.work); 862 struct omap_dss_device *in = ddata->in; 863 864 dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n"); 865 866 atomic_set(&ddata->do_update, 0); 867 in->ops.dsi->bus_unlock(in); 868 } 869 870 static int dsicm_update(struct omap_dss_device *dssdev, 871 u16 x, u16 y, u16 w, u16 h) 872 { 873 struct panel_drv_data *ddata = to_panel_data(dssdev); 874 struct omap_dss_device *in = ddata->in; 875 int r; 876 877 dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h); 878 879 mutex_lock(&ddata->lock); 880 in->ops.dsi->bus_lock(in); 881 882 r = dsicm_wake_up(ddata); 883 if (r) 884 goto err; 885 886 if (!ddata->enabled) { 887 r = 0; 888 goto err; 889 } 890 891 /* XXX no need to send this every frame, but dsi break if not done */ 892 r = dsicm_set_update_window(ddata, 0, 0, 893 dssdev->panel.timings.x_res, 894 dssdev->panel.timings.y_res); 895 if (r) 896 goto err; 897 898 if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) { 899 schedule_delayed_work(&ddata->te_timeout_work, 900 msecs_to_jiffies(250)); 901 atomic_set(&ddata->do_update, 1); 902 } else { 903 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb, 904 ddata); 905 if (r) 906 goto err; 907 } 908 909 /* note: no bus_unlock here. unlock is in framedone_cb */ 910 mutex_unlock(&ddata->lock); 911 return 0; 912 err: 913 in->ops.dsi->bus_unlock(in); 914 mutex_unlock(&ddata->lock); 915 return r; 916 } 917 918 static int dsicm_sync(struct omap_dss_device *dssdev) 919 { 920 struct panel_drv_data *ddata = to_panel_data(dssdev); 921 struct omap_dss_device *in = ddata->in; 922 923 dev_dbg(&ddata->pdev->dev, "sync\n"); 924 925 mutex_lock(&ddata->lock); 926 in->ops.dsi->bus_lock(in); 927 in->ops.dsi->bus_unlock(in); 928 mutex_unlock(&ddata->lock); 929 930 dev_dbg(&ddata->pdev->dev, "sync done\n"); 931 932 return 0; 933 } 934 935 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable) 936 { 937 struct omap_dss_device *in = ddata->in; 938 int r; 939 940 if (enable) 941 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0); 942 else 943 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF); 944 945 if (!gpio_is_valid(ddata->ext_te_gpio)) 946 in->ops.dsi->enable_te(in, enable); 947 948 /* possible panel bug */ 949 msleep(100); 950 951 return r; 952 } 953 954 static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable) 955 { 956 struct panel_drv_data *ddata = to_panel_data(dssdev); 957 struct omap_dss_device *in = ddata->in; 958 int r; 959 960 mutex_lock(&ddata->lock); 961 962 if (ddata->te_enabled == enable) 963 goto end; 964 965 in->ops.dsi->bus_lock(in); 966 967 if (ddata->enabled) { 968 r = dsicm_wake_up(ddata); 969 if (r) 970 goto err; 971 972 r = _dsicm_enable_te(ddata, enable); 973 if (r) 974 goto err; 975 } 976 977 ddata->te_enabled = enable; 978 979 in->ops.dsi->bus_unlock(in); 980 end: 981 mutex_unlock(&ddata->lock); 982 983 return 0; 984 err: 985 in->ops.dsi->bus_unlock(in); 986 mutex_unlock(&ddata->lock); 987 988 return r; 989 } 990 991 static int dsicm_get_te(struct omap_dss_device *dssdev) 992 { 993 struct panel_drv_data *ddata = to_panel_data(dssdev); 994 int r; 995 996 mutex_lock(&ddata->lock); 997 r = ddata->te_enabled; 998 mutex_unlock(&ddata->lock); 999 1000 return r; 1001 } 1002 1003 static int dsicm_memory_read(struct omap_dss_device *dssdev, 1004 void *buf, size_t size, 1005 u16 x, u16 y, u16 w, u16 h) 1006 { 1007 struct panel_drv_data *ddata = to_panel_data(dssdev); 1008 struct omap_dss_device *in = ddata->in; 1009 int r; 1010 int first = 1; 1011 int plen; 1012 unsigned buf_used = 0; 1013 1014 if (size < w * h * 3) 1015 return -ENOMEM; 1016 1017 mutex_lock(&ddata->lock); 1018 1019 if (!ddata->enabled) { 1020 r = -ENODEV; 1021 goto err1; 1022 } 1023 1024 size = min(w * h * 3, 1025 dssdev->panel.timings.x_res * 1026 dssdev->panel.timings.y_res * 3); 1027 1028 in->ops.dsi->bus_lock(in); 1029 1030 r = dsicm_wake_up(ddata); 1031 if (r) 1032 goto err2; 1033 1034 /* plen 1 or 2 goes into short packet. until checksum error is fixed, 1035 * use short packets. plen 32 works, but bigger packets seem to cause 1036 * an error. */ 1037 if (size % 2) 1038 plen = 1; 1039 else 1040 plen = 2; 1041 1042 dsicm_set_update_window(ddata, x, y, w, h); 1043 1044 r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen); 1045 if (r) 1046 goto err2; 1047 1048 while (buf_used < size) { 1049 u8 dcs_cmd = first ? 0x2e : 0x3e; 1050 first = 0; 1051 1052 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, 1053 buf + buf_used, size - buf_used); 1054 1055 if (r < 0) { 1056 dev_err(dssdev->dev, "read error\n"); 1057 goto err3; 1058 } 1059 1060 buf_used += r; 1061 1062 if (r < plen) { 1063 dev_err(&ddata->pdev->dev, "short read\n"); 1064 break; 1065 } 1066 1067 if (signal_pending(current)) { 1068 dev_err(&ddata->pdev->dev, "signal pending, " 1069 "aborting memory read\n"); 1070 r = -ERESTARTSYS; 1071 goto err3; 1072 } 1073 } 1074 1075 r = buf_used; 1076 1077 err3: 1078 in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1); 1079 err2: 1080 in->ops.dsi->bus_unlock(in); 1081 err1: 1082 mutex_unlock(&ddata->lock); 1083 return r; 1084 } 1085 1086 static void dsicm_ulps_work(struct work_struct *work) 1087 { 1088 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data, 1089 ulps_work.work); 1090 struct omap_dss_device *dssdev = &ddata->dssdev; 1091 struct omap_dss_device *in = ddata->in; 1092 1093 mutex_lock(&ddata->lock); 1094 1095 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) { 1096 mutex_unlock(&ddata->lock); 1097 return; 1098 } 1099 1100 in->ops.dsi->bus_lock(in); 1101 1102 dsicm_enter_ulps(ddata); 1103 1104 in->ops.dsi->bus_unlock(in); 1105 mutex_unlock(&ddata->lock); 1106 } 1107 1108 static struct omap_dss_driver dsicm_ops = { 1109 .connect = dsicm_connect, 1110 .disconnect = dsicm_disconnect, 1111 1112 .enable = dsicm_enable, 1113 .disable = dsicm_disable, 1114 1115 .update = dsicm_update, 1116 .sync = dsicm_sync, 1117 1118 .get_resolution = dsicm_get_resolution, 1119 .get_recommended_bpp = omapdss_default_get_recommended_bpp, 1120 1121 .enable_te = dsicm_enable_te, 1122 .get_te = dsicm_get_te, 1123 1124 .memory_read = dsicm_memory_read, 1125 }; 1126 1127 static int dsicm_probe_of(struct platform_device *pdev) 1128 { 1129 struct device_node *node = pdev->dev.of_node; 1130 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 1131 struct omap_dss_device *in; 1132 int gpio; 1133 1134 gpio = of_get_named_gpio(node, "reset-gpios", 0); 1135 if (!gpio_is_valid(gpio)) { 1136 dev_err(&pdev->dev, "failed to parse reset gpio\n"); 1137 return gpio; 1138 } 1139 ddata->reset_gpio = gpio; 1140 1141 gpio = of_get_named_gpio(node, "te-gpios", 0); 1142 if (gpio_is_valid(gpio) || gpio == -ENOENT) { 1143 ddata->ext_te_gpio = gpio; 1144 } else { 1145 dev_err(&pdev->dev, "failed to parse TE gpio\n"); 1146 return gpio; 1147 } 1148 1149 in = omapdss_of_find_source_for_first_ep(node); 1150 if (IS_ERR(in)) { 1151 dev_err(&pdev->dev, "failed to find video source\n"); 1152 return PTR_ERR(in); 1153 } 1154 1155 ddata->in = in; 1156 1157 /* TODO: ulps, backlight */ 1158 1159 return 0; 1160 } 1161 1162 static int dsicm_probe(struct platform_device *pdev) 1163 { 1164 struct backlight_properties props; 1165 struct panel_drv_data *ddata; 1166 struct backlight_device *bldev = NULL; 1167 struct device *dev = &pdev->dev; 1168 struct omap_dss_device *dssdev; 1169 int r; 1170 1171 dev_dbg(dev, "probe\n"); 1172 1173 if (!pdev->dev.of_node) 1174 return -ENODEV; 1175 1176 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); 1177 if (!ddata) 1178 return -ENOMEM; 1179 1180 platform_set_drvdata(pdev, ddata); 1181 ddata->pdev = pdev; 1182 1183 r = dsicm_probe_of(pdev); 1184 if (r) 1185 return r; 1186 1187 ddata->timings.x_res = 864; 1188 ddata->timings.y_res = 480; 1189 ddata->timings.pixelclock = 864 * 480 * 60; 1190 1191 dssdev = &ddata->dssdev; 1192 dssdev->dev = dev; 1193 dssdev->driver = &dsicm_ops; 1194 dssdev->panel.timings = ddata->timings; 1195 dssdev->type = OMAP_DISPLAY_TYPE_DSI; 1196 dssdev->owner = THIS_MODULE; 1197 1198 dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888; 1199 dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE | 1200 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM; 1201 1202 r = omapdss_register_display(dssdev); 1203 if (r) { 1204 dev_err(dev, "Failed to register panel\n"); 1205 goto err_reg; 1206 } 1207 1208 mutex_init(&ddata->lock); 1209 1210 atomic_set(&ddata->do_update, 0); 1211 1212 if (gpio_is_valid(ddata->reset_gpio)) { 1213 r = devm_gpio_request_one(dev, ddata->reset_gpio, 1214 GPIOF_OUT_INIT_LOW, "taal rst"); 1215 if (r) { 1216 dev_err(dev, "failed to request reset gpio\n"); 1217 return r; 1218 } 1219 } 1220 1221 if (gpio_is_valid(ddata->ext_te_gpio)) { 1222 r = devm_gpio_request_one(dev, ddata->ext_te_gpio, 1223 GPIOF_IN, "taal irq"); 1224 if (r) { 1225 dev_err(dev, "GPIO request failed\n"); 1226 return r; 1227 } 1228 1229 r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio), 1230 dsicm_te_isr, 1231 IRQF_TRIGGER_RISING, 1232 "taal vsync", ddata); 1233 1234 if (r) { 1235 dev_err(dev, "IRQ request failed\n"); 1236 return r; 1237 } 1238 1239 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work, 1240 dsicm_te_timeout_work_callback); 1241 1242 dev_dbg(dev, "Using GPIO TE\n"); 1243 } 1244 1245 INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work); 1246 1247 dsicm_hw_reset(ddata); 1248 1249 if (ddata->use_dsi_backlight) { 1250 memset(&props, 0, sizeof(struct backlight_properties)); 1251 props.max_brightness = 255; 1252 1253 props.type = BACKLIGHT_RAW; 1254 bldev = backlight_device_register(dev_name(dev), 1255 dev, ddata, &dsicm_bl_ops, &props); 1256 if (IS_ERR(bldev)) { 1257 r = PTR_ERR(bldev); 1258 goto err_reg; 1259 } 1260 1261 ddata->bldev = bldev; 1262 1263 bldev->props.fb_blank = FB_BLANK_UNBLANK; 1264 bldev->props.power = FB_BLANK_UNBLANK; 1265 bldev->props.brightness = 255; 1266 1267 dsicm_bl_update_status(bldev); 1268 } 1269 1270 r = sysfs_create_group(&dev->kobj, &dsicm_attr_group); 1271 if (r) { 1272 dev_err(dev, "failed to create sysfs files\n"); 1273 goto err_sysfs_create; 1274 } 1275 1276 return 0; 1277 1278 err_sysfs_create: 1279 if (bldev != NULL) 1280 backlight_device_unregister(bldev); 1281 err_reg: 1282 return r; 1283 } 1284 1285 static int __exit dsicm_remove(struct platform_device *pdev) 1286 { 1287 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 1288 struct omap_dss_device *dssdev = &ddata->dssdev; 1289 struct backlight_device *bldev; 1290 1291 dev_dbg(&pdev->dev, "remove\n"); 1292 1293 omapdss_unregister_display(dssdev); 1294 1295 dsicm_disable(dssdev); 1296 dsicm_disconnect(dssdev); 1297 1298 sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group); 1299 1300 bldev = ddata->bldev; 1301 if (bldev != NULL) { 1302 bldev->props.power = FB_BLANK_POWERDOWN; 1303 dsicm_bl_update_status(bldev); 1304 backlight_device_unregister(bldev); 1305 } 1306 1307 omap_dss_put_device(ddata->in); 1308 1309 dsicm_cancel_ulps_work(ddata); 1310 1311 /* reset, to be sure that the panel is in a valid state */ 1312 dsicm_hw_reset(ddata); 1313 1314 return 0; 1315 } 1316 1317 static const struct of_device_id dsicm_of_match[] = { 1318 { .compatible = "omapdss,panel-dsi-cm", }, 1319 {}, 1320 }; 1321 1322 MODULE_DEVICE_TABLE(of, dsicm_of_match); 1323 1324 static struct platform_driver dsicm_driver = { 1325 .probe = dsicm_probe, 1326 .remove = __exit_p(dsicm_remove), 1327 .driver = { 1328 .name = "panel-dsi-cm", 1329 .of_match_table = dsicm_of_match, 1330 .suppress_bind_attrs = true, 1331 }, 1332 }; 1333 1334 module_platform_driver(dsicm_driver); 1335 1336 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 1337 MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver"); 1338 MODULE_LICENSE("GPL"); 1339