1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com 4 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/device.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/i2c.h> 11 #include <linux/kernel.h> 12 #include <linux/math64.h> 13 #include <linux/media-bus-format.h> 14 #include <linux/minmax.h> 15 #include <linux/module.h> 16 #include <linux/regmap.h> 17 #include <linux/regulator/consumer.h> 18 #include <linux/slab.h> 19 #include <linux/units.h> 20 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_drv.h> 23 #include <drm/drm_mipi_dsi.h> 24 #include <drm/drm_of.h> 25 #include <drm/drm_panel.h> 26 #include <video/mipi_display.h> 27 #include <video/videomode.h> 28 29 /* Global (16-bit addressable) */ 30 #define TC358768_CHIPID 0x0000 31 #define TC358768_SYSCTL 0x0002 32 #define TC358768_CONFCTL 0x0004 33 #define TC358768_VSDLY 0x0006 34 #define TC358768_DATAFMT 0x0008 35 #define TC358768_GPIOEN 0x000E 36 #define TC358768_GPIODIR 0x0010 37 #define TC358768_GPIOIN 0x0012 38 #define TC358768_GPIOOUT 0x0014 39 #define TC358768_PLLCTL0 0x0016 40 #define TC358768_PLLCTL1 0x0018 41 #define TC358768_CMDBYTE 0x0022 42 #define TC358768_PP_MISC 0x0032 43 #define TC358768_DSITX_DT 0x0050 44 #define TC358768_FIFOSTATUS 0x00F8 45 46 /* Debug (16-bit addressable) */ 47 #define TC358768_VBUFCTRL 0x00E0 48 #define TC358768_DBG_WIDTH 0x00E2 49 #define TC358768_DBG_VBLANK 0x00E4 50 #define TC358768_DBG_DATA 0x00E8 51 52 /* TX PHY (32-bit addressable) */ 53 #define TC358768_CLW_DPHYCONTTX 0x0100 54 #define TC358768_D0W_DPHYCONTTX 0x0104 55 #define TC358768_D1W_DPHYCONTTX 0x0108 56 #define TC358768_D2W_DPHYCONTTX 0x010C 57 #define TC358768_D3W_DPHYCONTTX 0x0110 58 #define TC358768_CLW_CNTRL 0x0140 59 #define TC358768_D0W_CNTRL 0x0144 60 #define TC358768_D1W_CNTRL 0x0148 61 #define TC358768_D2W_CNTRL 0x014C 62 #define TC358768_D3W_CNTRL 0x0150 63 64 /* TX PPI (32-bit addressable) */ 65 #define TC358768_STARTCNTRL 0x0204 66 #define TC358768_DSITXSTATUS 0x0208 67 #define TC358768_LINEINITCNT 0x0210 68 #define TC358768_LPTXTIMECNT 0x0214 69 #define TC358768_TCLK_HEADERCNT 0x0218 70 #define TC358768_TCLK_TRAILCNT 0x021C 71 #define TC358768_THS_HEADERCNT 0x0220 72 #define TC358768_TWAKEUP 0x0224 73 #define TC358768_TCLK_POSTCNT 0x0228 74 #define TC358768_THS_TRAILCNT 0x022C 75 #define TC358768_HSTXVREGCNT 0x0230 76 #define TC358768_HSTXVREGEN 0x0234 77 #define TC358768_TXOPTIONCNTRL 0x0238 78 #define TC358768_BTACNTRL1 0x023C 79 80 /* TX CTRL (32-bit addressable) */ 81 #define TC358768_DSI_CONTROL 0x040C 82 #define TC358768_DSI_STATUS 0x0410 83 #define TC358768_DSI_INT 0x0414 84 #define TC358768_DSI_INT_ENA 0x0418 85 #define TC358768_DSICMD_RDFIFO 0x0430 86 #define TC358768_DSI_ACKERR 0x0434 87 #define TC358768_DSI_ACKERR_INTENA 0x0438 88 #define TC358768_DSI_ACKERR_HALT 0x043c 89 #define TC358768_DSI_RXERR 0x0440 90 #define TC358768_DSI_RXERR_INTENA 0x0444 91 #define TC358768_DSI_RXERR_HALT 0x0448 92 #define TC358768_DSI_ERR 0x044C 93 #define TC358768_DSI_ERR_INTENA 0x0450 94 #define TC358768_DSI_ERR_HALT 0x0454 95 #define TC358768_DSI_CONFW 0x0500 96 #define TC358768_DSI_LPCMD 0x0500 97 #define TC358768_DSI_RESET 0x0504 98 #define TC358768_DSI_INT_CLR 0x050C 99 #define TC358768_DSI_START 0x0518 100 101 /* DSITX CTRL (16-bit addressable) */ 102 #define TC358768_DSICMD_TX 0x0600 103 #define TC358768_DSICMD_TYPE 0x0602 104 #define TC358768_DSICMD_WC 0x0604 105 #define TC358768_DSICMD_WD0 0x0610 106 #define TC358768_DSICMD_WD1 0x0612 107 #define TC358768_DSICMD_WD2 0x0614 108 #define TC358768_DSICMD_WD3 0x0616 109 #define TC358768_DSI_EVENT 0x0620 110 #define TC358768_DSI_VSW 0x0622 111 #define TC358768_DSI_VBPR 0x0624 112 #define TC358768_DSI_VACT 0x0626 113 #define TC358768_DSI_HSW 0x0628 114 #define TC358768_DSI_HBPR 0x062A 115 #define TC358768_DSI_HACT 0x062C 116 117 /* TC358768_DSI_CONTROL (0x040C) register */ 118 #define TC358768_DSI_CONTROL_DIS_MODE BIT(15) 119 #define TC358768_DSI_CONTROL_TXMD BIT(7) 120 #define TC358768_DSI_CONTROL_HSCKMD BIT(5) 121 #define TC358768_DSI_CONTROL_EOTDIS BIT(0) 122 123 /* TC358768_DSI_CONFW (0x0500) register */ 124 #define TC358768_DSI_CONFW_MODE_SET (5 << 29) 125 #define TC358768_DSI_CONFW_MODE_CLR (6 << 29) 126 #define TC358768_DSI_CONFW_ADDR_DSI_CONTROL (0x3 << 24) 127 128 static const char * const tc358768_supplies[] = { 129 "vddc", "vddmipi", "vddio" 130 }; 131 132 struct tc358768_dsi_output { 133 struct mipi_dsi_device *dev; 134 struct drm_panel *panel; 135 struct drm_bridge *bridge; 136 }; 137 138 struct tc358768_priv { 139 struct device *dev; 140 struct regmap *regmap; 141 struct gpio_desc *reset_gpio; 142 struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)]; 143 struct clk *refclk; 144 int enabled; 145 int error; 146 147 struct mipi_dsi_host dsi_host; 148 struct drm_bridge bridge; 149 struct tc358768_dsi_output output; 150 151 u32 pd_lines; /* number of Parallel Port Input Data Lines */ 152 u32 dsi_lanes; /* number of DSI Lanes */ 153 u32 dsi_bpp; /* number of Bits Per Pixel over DSI */ 154 155 /* Parameters for PLL programming */ 156 u32 fbd; /* PLL feedback divider */ 157 u32 prd; /* PLL input divider */ 158 u32 frs; /* PLL Freqency range for HSCK (post divider) */ 159 160 u32 dsiclk; /* pll_clk / 2 */ 161 u32 pclk; /* incoming pclk rate */ 162 }; 163 164 static inline struct tc358768_priv *dsi_host_to_tc358768(struct mipi_dsi_host 165 *host) 166 { 167 return container_of(host, struct tc358768_priv, dsi_host); 168 } 169 170 static inline struct tc358768_priv *bridge_to_tc358768(struct drm_bridge 171 *bridge) 172 { 173 return container_of(bridge, struct tc358768_priv, bridge); 174 } 175 176 static int tc358768_clear_error(struct tc358768_priv *priv) 177 { 178 int ret = priv->error; 179 180 priv->error = 0; 181 return ret; 182 } 183 184 static void tc358768_write(struct tc358768_priv *priv, u32 reg, u32 val) 185 { 186 /* work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */ 187 int tmpval = val; 188 size_t count = 2; 189 190 if (priv->error) 191 return; 192 193 /* 16-bit register? */ 194 if (reg < 0x100 || reg >= 0x600) 195 count = 1; 196 197 priv->error = regmap_bulk_write(priv->regmap, reg, &tmpval, count); 198 } 199 200 static void tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val) 201 { 202 size_t count = 2; 203 204 if (priv->error) 205 return; 206 207 /* 16-bit register? */ 208 if (reg < 0x100 || reg >= 0x600) { 209 *val = 0; 210 count = 1; 211 } 212 213 priv->error = regmap_bulk_read(priv->regmap, reg, val, count); 214 } 215 216 static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask, 217 u32 val) 218 { 219 u32 tmp, orig; 220 221 tc358768_read(priv, reg, &orig); 222 223 if (priv->error) 224 return; 225 226 tmp = orig & ~mask; 227 tmp |= val & mask; 228 if (tmp != orig) 229 tc358768_write(priv, reg, tmp); 230 } 231 232 static int tc358768_sw_reset(struct tc358768_priv *priv) 233 { 234 /* Assert Reset */ 235 tc358768_write(priv, TC358768_SYSCTL, 1); 236 /* Release Reset, Exit Sleep */ 237 tc358768_write(priv, TC358768_SYSCTL, 0); 238 239 return tc358768_clear_error(priv); 240 } 241 242 static void tc358768_hw_enable(struct tc358768_priv *priv) 243 { 244 int ret; 245 246 if (priv->enabled) 247 return; 248 249 ret = clk_prepare_enable(priv->refclk); 250 if (ret < 0) 251 dev_err(priv->dev, "error enabling refclk (%d)\n", ret); 252 253 ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); 254 if (ret < 0) 255 dev_err(priv->dev, "error enabling regulators (%d)\n", ret); 256 257 if (priv->reset_gpio) 258 usleep_range(200, 300); 259 260 /* 261 * The RESX is active low (GPIO_ACTIVE_LOW). 262 * DEASSERT (value = 0) the reset_gpio to enable the chip 263 */ 264 gpiod_set_value_cansleep(priv->reset_gpio, 0); 265 266 /* wait for encoder clocks to stabilize */ 267 usleep_range(1000, 2000); 268 269 priv->enabled = true; 270 } 271 272 static void tc358768_hw_disable(struct tc358768_priv *priv) 273 { 274 int ret; 275 276 if (!priv->enabled) 277 return; 278 279 /* 280 * The RESX is active low (GPIO_ACTIVE_LOW). 281 * ASSERT (value = 1) the reset_gpio to disable the chip 282 */ 283 gpiod_set_value_cansleep(priv->reset_gpio, 1); 284 285 ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies), 286 priv->supplies); 287 if (ret < 0) 288 dev_err(priv->dev, "error disabling regulators (%d)\n", ret); 289 290 clk_disable_unprepare(priv->refclk); 291 292 priv->enabled = false; 293 } 294 295 static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk) 296 { 297 return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->dsi_bpp); 298 } 299 300 static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk) 301 { 302 return (u32)div_u64((u64)pclk * priv->dsi_bpp, priv->dsi_lanes); 303 } 304 305 static int tc358768_calc_pll(struct tc358768_priv *priv, 306 const struct drm_display_mode *mode, 307 bool verify_only) 308 { 309 static const u32 frs_limits[] = { 310 1000000000, 311 500000000, 312 250000000, 313 125000000, 314 62500000 315 }; 316 unsigned long refclk; 317 u32 prd, target_pll, i, max_pll, min_pll; 318 u32 frs, best_diff, best_pll, best_prd, best_fbd; 319 320 target_pll = tc358768_pclk_to_pll(priv, mode->clock * 1000); 321 322 /* pll_clk = RefClk * [(FBD + 1)/ (PRD + 1)] * [1 / (2^FRS)] */ 323 324 for (i = 0; i < ARRAY_SIZE(frs_limits); i++) 325 if (target_pll >= frs_limits[i]) 326 break; 327 328 if (i == ARRAY_SIZE(frs_limits) || i == 0) 329 return -EINVAL; 330 331 frs = i - 1; 332 max_pll = frs_limits[i - 1]; 333 min_pll = frs_limits[i]; 334 335 refclk = clk_get_rate(priv->refclk); 336 337 best_diff = UINT_MAX; 338 best_pll = 0; 339 best_prd = 0; 340 best_fbd = 0; 341 342 for (prd = 0; prd < 16; ++prd) { 343 u32 divisor = (prd + 1) * (1 << frs); 344 u32 fbd; 345 346 for (fbd = 0; fbd < 512; ++fbd) { 347 u32 pll, diff, pll_in; 348 349 pll = (u32)div_u64((u64)refclk * (fbd + 1), divisor); 350 351 if (pll >= max_pll || pll < min_pll) 352 continue; 353 354 pll_in = (u32)div_u64((u64)refclk, prd + 1); 355 if (pll_in < 4000000) 356 continue; 357 358 diff = max(pll, target_pll) - min(pll, target_pll); 359 360 if (diff < best_diff) { 361 best_diff = diff; 362 best_pll = pll; 363 best_prd = prd; 364 best_fbd = fbd; 365 366 if (best_diff == 0) 367 goto found; 368 } 369 } 370 } 371 372 if (best_diff == UINT_MAX) { 373 dev_err(priv->dev, "could not find suitable PLL setup\n"); 374 return -EINVAL; 375 } 376 377 found: 378 if (verify_only) 379 return 0; 380 381 priv->fbd = best_fbd; 382 priv->prd = best_prd; 383 priv->frs = frs; 384 priv->dsiclk = best_pll / 2; 385 priv->pclk = mode->clock * 1000; 386 387 return 0; 388 } 389 390 static int tc358768_dsi_host_attach(struct mipi_dsi_host *host, 391 struct mipi_dsi_device *dev) 392 { 393 struct tc358768_priv *priv = dsi_host_to_tc358768(host); 394 struct drm_bridge *bridge; 395 struct drm_panel *panel; 396 struct device_node *ep; 397 int ret; 398 399 if (dev->lanes > 4) { 400 dev_err(priv->dev, "unsupported number of data lanes(%u)\n", 401 dev->lanes); 402 return -EINVAL; 403 } 404 405 /* 406 * tc358768 supports both Video and Pulse mode, but the driver only 407 * implements Video (event) mode currently 408 */ 409 if (!(dev->mode_flags & MIPI_DSI_MODE_VIDEO)) { 410 dev_err(priv->dev, "Only MIPI_DSI_MODE_VIDEO is supported\n"); 411 return -ENOTSUPP; 412 } 413 414 /* 415 * tc358768 supports RGB888, RGB666, RGB666_PACKED and RGB565, but only 416 * RGB888 is verified. 417 */ 418 if (dev->format != MIPI_DSI_FMT_RGB888) { 419 dev_warn(priv->dev, "Only MIPI_DSI_FMT_RGB888 tested!\n"); 420 return -ENOTSUPP; 421 } 422 423 ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel, 424 &bridge); 425 if (ret) 426 return ret; 427 428 if (panel) { 429 bridge = drm_panel_bridge_add_typed(panel, 430 DRM_MODE_CONNECTOR_DSI); 431 if (IS_ERR(bridge)) 432 return PTR_ERR(bridge); 433 } 434 435 priv->output.dev = dev; 436 priv->output.bridge = bridge; 437 priv->output.panel = panel; 438 439 priv->dsi_lanes = dev->lanes; 440 priv->dsi_bpp = mipi_dsi_pixel_format_to_bpp(dev->format); 441 442 /* get input ep (port0/endpoint0) */ 443 ret = -EINVAL; 444 ep = of_graph_get_endpoint_by_regs(host->dev->of_node, 0, 0); 445 if (ep) { 446 ret = of_property_read_u32(ep, "data-lines", &priv->pd_lines); 447 448 of_node_put(ep); 449 } 450 451 if (ret) 452 priv->pd_lines = priv->dsi_bpp; 453 454 drm_bridge_add(&priv->bridge); 455 456 return 0; 457 } 458 459 static int tc358768_dsi_host_detach(struct mipi_dsi_host *host, 460 struct mipi_dsi_device *dev) 461 { 462 struct tc358768_priv *priv = dsi_host_to_tc358768(host); 463 464 drm_bridge_remove(&priv->bridge); 465 if (priv->output.panel) 466 drm_panel_bridge_remove(priv->output.bridge); 467 468 return 0; 469 } 470 471 static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host, 472 const struct mipi_dsi_msg *msg) 473 { 474 struct tc358768_priv *priv = dsi_host_to_tc358768(host); 475 struct mipi_dsi_packet packet; 476 int ret; 477 478 if (!priv->enabled) { 479 dev_err(priv->dev, "Bridge is not enabled\n"); 480 return -ENODEV; 481 } 482 483 if (msg->rx_len) { 484 dev_warn(priv->dev, "MIPI rx is not supported\n"); 485 return -ENOTSUPP; 486 } 487 488 if (msg->tx_len > 8) { 489 dev_warn(priv->dev, "Maximum 8 byte MIPI tx is supported\n"); 490 return -ENOTSUPP; 491 } 492 493 ret = mipi_dsi_create_packet(&packet, msg); 494 if (ret) 495 return ret; 496 497 if (mipi_dsi_packet_format_is_short(msg->type)) { 498 tc358768_write(priv, TC358768_DSICMD_TYPE, 499 (0x10 << 8) | (packet.header[0] & 0x3f)); 500 tc358768_write(priv, TC358768_DSICMD_WC, 0); 501 tc358768_write(priv, TC358768_DSICMD_WD0, 502 (packet.header[2] << 8) | packet.header[1]); 503 } else { 504 int i; 505 506 tc358768_write(priv, TC358768_DSICMD_TYPE, 507 (0x40 << 8) | (packet.header[0] & 0x3f)); 508 tc358768_write(priv, TC358768_DSICMD_WC, packet.payload_length); 509 for (i = 0; i < packet.payload_length; i += 2) { 510 u16 val = packet.payload[i]; 511 512 if (i + 1 < packet.payload_length) 513 val |= packet.payload[i + 1] << 8; 514 515 tc358768_write(priv, TC358768_DSICMD_WD0 + i, val); 516 } 517 } 518 519 /* start transfer */ 520 tc358768_write(priv, TC358768_DSICMD_TX, 1); 521 522 ret = tc358768_clear_error(priv); 523 if (ret) 524 dev_warn(priv->dev, "Software disable failed: %d\n", ret); 525 else 526 ret = packet.size; 527 528 return ret; 529 } 530 531 static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = { 532 .attach = tc358768_dsi_host_attach, 533 .detach = tc358768_dsi_host_detach, 534 .transfer = tc358768_dsi_host_transfer, 535 }; 536 537 static int tc358768_bridge_attach(struct drm_bridge *bridge, 538 enum drm_bridge_attach_flags flags) 539 { 540 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 541 542 if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) { 543 dev_err(priv->dev, "needs atomic updates support\n"); 544 return -ENOTSUPP; 545 } 546 547 return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge, 548 flags); 549 } 550 551 static enum drm_mode_status 552 tc358768_bridge_mode_valid(struct drm_bridge *bridge, 553 const struct drm_display_info *info, 554 const struct drm_display_mode *mode) 555 { 556 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 557 558 if (tc358768_calc_pll(priv, mode, true)) 559 return MODE_CLOCK_RANGE; 560 561 return MODE_OK; 562 } 563 564 static void tc358768_bridge_disable(struct drm_bridge *bridge) 565 { 566 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 567 int ret; 568 569 /* set FrmStop */ 570 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(15), BIT(15)); 571 572 /* wait at least for one frame */ 573 msleep(50); 574 575 /* clear PP_en */ 576 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), 0); 577 578 /* set RstPtr */ 579 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(14), BIT(14)); 580 581 ret = tc358768_clear_error(priv); 582 if (ret) 583 dev_warn(priv->dev, "Software disable failed: %d\n", ret); 584 } 585 586 static void tc358768_bridge_post_disable(struct drm_bridge *bridge) 587 { 588 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 589 590 tc358768_hw_disable(priv); 591 } 592 593 static int tc358768_setup_pll(struct tc358768_priv *priv, 594 const struct drm_display_mode *mode) 595 { 596 u32 fbd, prd, frs; 597 int ret; 598 599 ret = tc358768_calc_pll(priv, mode, false); 600 if (ret) { 601 dev_err(priv->dev, "PLL calculation failed: %d\n", ret); 602 return ret; 603 } 604 605 fbd = priv->fbd; 606 prd = priv->prd; 607 frs = priv->frs; 608 609 dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n", 610 clk_get_rate(priv->refclk), fbd, prd, frs); 611 dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, HSByteClk %u\n", 612 priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4); 613 dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n", 614 tc358768_pll_to_pclk(priv, priv->dsiclk * 2), 615 mode->clock * 1000); 616 617 /* PRD[15:12] FBD[8:0] */ 618 tc358768_write(priv, TC358768_PLLCTL0, (prd << 12) | fbd); 619 620 /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */ 621 tc358768_write(priv, TC358768_PLLCTL1, 622 (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0)); 623 624 /* wait for lock */ 625 usleep_range(1000, 2000); 626 627 /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */ 628 tc358768_write(priv, TC358768_PLLCTL1, 629 (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0)); 630 631 return tc358768_clear_error(priv); 632 } 633 634 static u32 tc358768_ns_to_cnt(u32 ns, u32 period_ps) 635 { 636 return DIV_ROUND_UP(ns * 1000, period_ps); 637 } 638 639 static u32 tc358768_ps_to_ns(u32 ps) 640 { 641 return ps / 1000; 642 } 643 644 static u32 tc358768_dpi_to_ns(u32 val, u32 pclk) 645 { 646 return (u32)div_u64((u64)val * NANO, pclk); 647 } 648 649 /* Convert value in DPI pixel clock units to DSI byte count */ 650 static u32 tc358768_dpi_to_dsi_bytes(struct tc358768_priv *priv, u32 val) 651 { 652 u64 m = (u64)val * priv->dsiclk / 4 * priv->dsi_lanes; 653 u64 n = priv->pclk; 654 655 return (u32)div_u64(m + n - 1, n); 656 } 657 658 static u32 tc358768_dsi_bytes_to_ns(struct tc358768_priv *priv, u32 val) 659 { 660 u64 m = (u64)val * NANO; 661 u64 n = priv->dsiclk / 4 * priv->dsi_lanes; 662 663 return (u32)div_u64(m, n); 664 } 665 666 static void tc358768_bridge_pre_enable(struct drm_bridge *bridge) 667 { 668 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 669 struct mipi_dsi_device *dsi_dev = priv->output.dev; 670 unsigned long mode_flags = dsi_dev->mode_flags; 671 u32 val, val2, lptxcnt, hact, data_type; 672 s32 raw_val; 673 const struct drm_display_mode *mode; 674 u32 hsbyteclk_ps, dsiclk_ps, ui_ps; 675 u32 dsiclk, hsbyteclk; 676 int ret, i; 677 struct videomode vm; 678 struct device *dev = priv->dev; 679 /* In pixelclock units */ 680 u32 dpi_htot, dpi_data_start; 681 /* In byte units */ 682 u32 dsi_dpi_htot, dsi_dpi_data_start; 683 u32 dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp; 684 const u32 dsi_hss = 4; /* HSS is a short packet (4 bytes) */ 685 /* In hsbyteclk units */ 686 u32 dsi_vsdly; 687 const u32 internal_dly = 40; 688 689 if (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) { 690 dev_warn_once(dev, "Non-continuous mode unimplemented, falling back to continuous\n"); 691 mode_flags &= ~MIPI_DSI_CLOCK_NON_CONTINUOUS; 692 } 693 694 tc358768_hw_enable(priv); 695 696 ret = tc358768_sw_reset(priv); 697 if (ret) { 698 dev_err(dev, "Software reset failed: %d\n", ret); 699 tc358768_hw_disable(priv); 700 return; 701 } 702 703 mode = &bridge->encoder->crtc->state->adjusted_mode; 704 ret = tc358768_setup_pll(priv, mode); 705 if (ret) { 706 dev_err(dev, "PLL setup failed: %d\n", ret); 707 tc358768_hw_disable(priv); 708 return; 709 } 710 711 drm_display_mode_to_videomode(mode, &vm); 712 713 dsiclk = priv->dsiclk; 714 hsbyteclk = dsiclk / 4; 715 716 /* Data Format Control Register */ 717 val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */ 718 switch (dsi_dev->format) { 719 case MIPI_DSI_FMT_RGB888: 720 val |= (0x3 << 4); 721 hact = vm.hactive * 3; 722 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24; 723 break; 724 case MIPI_DSI_FMT_RGB666: 725 val |= (0x4 << 4); 726 hact = vm.hactive * 3; 727 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18; 728 break; 729 730 case MIPI_DSI_FMT_RGB666_PACKED: 731 val |= (0x4 << 4) | BIT(3); 732 hact = vm.hactive * 18 / 8; 733 data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18; 734 break; 735 736 case MIPI_DSI_FMT_RGB565: 737 val |= (0x5 << 4); 738 hact = vm.hactive * 2; 739 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16; 740 break; 741 default: 742 dev_err(dev, "Invalid data format (%u)\n", 743 dsi_dev->format); 744 tc358768_hw_disable(priv); 745 return; 746 } 747 748 /* 749 * There are three important things to make TC358768 work correctly, 750 * which are not trivial to manage: 751 * 752 * 1. Keep the DPI line-time and the DSI line-time as close to each 753 * other as possible. 754 * 2. TC358768 goes to LP mode after each line's active area. The DSI 755 * HFP period has to be long enough for entering and exiting LP mode. 756 * But it is not clear how to calculate this. 757 * 3. VSDly (video start delay) has to be long enough to ensure that the 758 * DSI TX does not start transmitting until we have started receiving 759 * pixel data from the DPI input. It is not clear how to calculate 760 * this either. 761 */ 762 763 dpi_htot = vm.hactive + vm.hfront_porch + vm.hsync_len + vm.hback_porch; 764 dpi_data_start = vm.hsync_len + vm.hback_porch; 765 766 dev_dbg(dev, "dpi horiz timing (pclk): %u + %u + %u + %u = %u\n", 767 vm.hsync_len, vm.hback_porch, vm.hactive, vm.hfront_porch, 768 dpi_htot); 769 770 dev_dbg(dev, "dpi horiz timing (ns): %u + %u + %u + %u = %u\n", 771 tc358768_dpi_to_ns(vm.hsync_len, vm.pixelclock), 772 tc358768_dpi_to_ns(vm.hback_porch, vm.pixelclock), 773 tc358768_dpi_to_ns(vm.hactive, vm.pixelclock), 774 tc358768_dpi_to_ns(vm.hfront_porch, vm.pixelclock), 775 tc358768_dpi_to_ns(dpi_htot, vm.pixelclock)); 776 777 dev_dbg(dev, "dpi data start (ns): %u + %u = %u\n", 778 tc358768_dpi_to_ns(vm.hsync_len, vm.pixelclock), 779 tc358768_dpi_to_ns(vm.hback_porch, vm.pixelclock), 780 tc358768_dpi_to_ns(dpi_data_start, vm.pixelclock)); 781 782 dsi_dpi_htot = tc358768_dpi_to_dsi_bytes(priv, dpi_htot); 783 dsi_dpi_data_start = tc358768_dpi_to_dsi_bytes(priv, dpi_data_start); 784 785 if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { 786 dsi_hsw = tc358768_dpi_to_dsi_bytes(priv, vm.hsync_len); 787 dsi_hbp = tc358768_dpi_to_dsi_bytes(priv, vm.hback_porch); 788 } else { 789 /* HBP is included in HSW in event mode */ 790 dsi_hbp = 0; 791 dsi_hsw = tc358768_dpi_to_dsi_bytes(priv, 792 vm.hsync_len + 793 vm.hback_porch); 794 795 /* 796 * The pixel packet includes the actual pixel data, and: 797 * DSI packet header = 4 bytes 798 * DCS code = 1 byte 799 * DSI packet footer = 2 bytes 800 */ 801 dsi_hact = hact + 4 + 1 + 2; 802 803 dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss; 804 805 /* 806 * Here we should check if HFP is long enough for entering LP 807 * and exiting LP, but it's not clear how to calculate that. 808 * Instead, this is a naive algorithm that just adjusts the HFP 809 * and HSW so that HFP is (at least) roughly 2/3 of the total 810 * blanking time. 811 */ 812 if (dsi_hfp < (dsi_hfp + dsi_hsw + dsi_hss) * 2 / 3) { 813 u32 old_hfp = dsi_hfp; 814 u32 old_hsw = dsi_hsw; 815 u32 tot = dsi_hfp + dsi_hsw + dsi_hss; 816 817 dsi_hsw = tot / 3; 818 819 /* 820 * Seems like sometimes HSW has to be divisible by num-lanes, but 821 * not always... 822 */ 823 dsi_hsw = roundup(dsi_hsw, priv->dsi_lanes); 824 825 dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss; 826 827 dev_dbg(dev, 828 "hfp too short, adjusting dsi hfp and dsi hsw from %u, %u to %u, %u\n", 829 old_hfp, old_hsw, dsi_hfp, dsi_hsw); 830 } 831 832 dev_dbg(dev, 833 "dsi horiz timing (bytes): %u, %u + %u + %u + %u = %u\n", 834 dsi_hss, dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp, 835 dsi_hss + dsi_hsw + dsi_hbp + dsi_hact + dsi_hfp); 836 837 dev_dbg(dev, "dsi horiz timing (ns): %u + %u + %u + %u + %u = %u\n", 838 tc358768_dsi_bytes_to_ns(priv, dsi_hss), 839 tc358768_dsi_bytes_to_ns(priv, dsi_hsw), 840 tc358768_dsi_bytes_to_ns(priv, dsi_hbp), 841 tc358768_dsi_bytes_to_ns(priv, dsi_hact), 842 tc358768_dsi_bytes_to_ns(priv, dsi_hfp), 843 tc358768_dsi_bytes_to_ns(priv, dsi_hss + dsi_hsw + 844 dsi_hbp + dsi_hact + dsi_hfp)); 845 } 846 847 /* VSDly calculation */ 848 849 /* Start with the HW internal delay */ 850 dsi_vsdly = internal_dly; 851 852 /* Convert to byte units as the other variables are in byte units */ 853 dsi_vsdly *= priv->dsi_lanes; 854 855 /* Do we need more delay, in addition to the internal? */ 856 if (dsi_dpi_data_start > dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp) { 857 dsi_vsdly = dsi_dpi_data_start - dsi_hss - dsi_hsw - dsi_hbp; 858 dsi_vsdly = roundup(dsi_vsdly, priv->dsi_lanes); 859 } 860 861 dev_dbg(dev, "dsi data start (bytes) %u + %u + %u + %u = %u\n", 862 dsi_vsdly, dsi_hss, dsi_hsw, dsi_hbp, 863 dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp); 864 865 dev_dbg(dev, "dsi data start (ns) %u + %u + %u + %u = %u\n", 866 tc358768_dsi_bytes_to_ns(priv, dsi_vsdly), 867 tc358768_dsi_bytes_to_ns(priv, dsi_hss), 868 tc358768_dsi_bytes_to_ns(priv, dsi_hsw), 869 tc358768_dsi_bytes_to_ns(priv, dsi_hbp), 870 tc358768_dsi_bytes_to_ns(priv, dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp)); 871 872 /* Convert back to hsbyteclk */ 873 dsi_vsdly /= priv->dsi_lanes; 874 875 /* 876 * The docs say that there is an internal delay of 40 cycles. 877 * However, we get underflows if we follow that rule. If we 878 * instead ignore the internal delay, things work. So either 879 * the docs are wrong or the calculations are wrong. 880 * 881 * As a temporary fix, add the internal delay here, to counter 882 * the subtraction when writing the register. 883 */ 884 dsi_vsdly += internal_dly; 885 886 /* Clamp to the register max */ 887 if (dsi_vsdly - internal_dly > 0x3ff) { 888 dev_warn(dev, "VSDly too high, underflows likely\n"); 889 dsi_vsdly = 0x3ff + internal_dly; 890 } 891 892 /* VSDly[9:0] */ 893 tc358768_write(priv, TC358768_VSDLY, dsi_vsdly - internal_dly); 894 895 tc358768_write(priv, TC358768_DATAFMT, val); 896 tc358768_write(priv, TC358768_DSITX_DT, data_type); 897 898 /* Enable D-PHY (HiZ->LP11) */ 899 tc358768_write(priv, TC358768_CLW_CNTRL, 0x0000); 900 /* Enable lanes */ 901 for (i = 0; i < dsi_dev->lanes; i++) 902 tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000); 903 904 /* DSI Timings */ 905 hsbyteclk_ps = (u32)div_u64(PICO, hsbyteclk); 906 dsiclk_ps = (u32)div_u64(PICO, dsiclk); 907 ui_ps = dsiclk_ps / 2; 908 dev_dbg(dev, "dsiclk: %u ps, ui %u ps, hsbyteclk %u ps\n", dsiclk_ps, 909 ui_ps, hsbyteclk_ps); 910 911 /* LP11 > 100us for D-PHY Rx Init */ 912 val = tc358768_ns_to_cnt(100 * 1000, hsbyteclk_ps) - 1; 913 dev_dbg(dev, "LINEINITCNT: %u\n", val); 914 tc358768_write(priv, TC358768_LINEINITCNT, val); 915 916 /* LPTimeCnt > 50ns */ 917 val = tc358768_ns_to_cnt(50, hsbyteclk_ps) - 1; 918 lptxcnt = val; 919 dev_dbg(dev, "LPTXTIMECNT: %u\n", val); 920 tc358768_write(priv, TC358768_LPTXTIMECNT, val); 921 922 /* 38ns < TCLK_PREPARE < 95ns */ 923 val = tc358768_ns_to_cnt(65, hsbyteclk_ps) - 1; 924 dev_dbg(dev, "TCLK_PREPARECNT %u\n", val); 925 /* TCLK_PREPARE + TCLK_ZERO > 300ns */ 926 val2 = tc358768_ns_to_cnt(300 - tc358768_ps_to_ns(2 * ui_ps), 927 hsbyteclk_ps) - 2; 928 dev_dbg(dev, "TCLK_ZEROCNT %u\n", val2); 929 val |= val2 << 8; 930 tc358768_write(priv, TC358768_TCLK_HEADERCNT, val); 931 932 /* TCLK_TRAIL > 60ns AND TEOT <= 105 ns + 12*UI */ 933 raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(2 * ui_ps), hsbyteclk_ps) - 5; 934 val = clamp(raw_val, 0, 127); 935 dev_dbg(dev, "TCLK_TRAILCNT: %u\n", val); 936 tc358768_write(priv, TC358768_TCLK_TRAILCNT, val); 937 938 /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */ 939 val = 50 + tc358768_ps_to_ns(4 * ui_ps); 940 val = tc358768_ns_to_cnt(val, hsbyteclk_ps) - 1; 941 dev_dbg(dev, "THS_PREPARECNT %u\n", val); 942 /* THS_PREPARE + THS_ZERO > 145ns + 10*UI */ 943 raw_val = tc358768_ns_to_cnt(145 - tc358768_ps_to_ns(3 * ui_ps), hsbyteclk_ps) - 10; 944 val2 = clamp(raw_val, 0, 127); 945 dev_dbg(dev, "THS_ZEROCNT %u\n", val2); 946 val |= val2 << 8; 947 tc358768_write(priv, TC358768_THS_HEADERCNT, val); 948 949 /* TWAKEUP > 1ms in lptxcnt steps */ 950 val = tc358768_ns_to_cnt(1020000, hsbyteclk_ps); 951 val = val / (lptxcnt + 1) - 1; 952 dev_dbg(dev, "TWAKEUP: %u\n", val); 953 tc358768_write(priv, TC358768_TWAKEUP, val); 954 955 /* TCLK_POSTCNT > 60ns + 52*UI */ 956 val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(52 * ui_ps), 957 hsbyteclk_ps) - 3; 958 dev_dbg(dev, "TCLK_POSTCNT: %u\n", val); 959 tc358768_write(priv, TC358768_TCLK_POSTCNT, val); 960 961 /* max(60ns + 4*UI, 8*UI) < THS_TRAILCNT < 105ns + 12*UI */ 962 raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(18 * ui_ps), 963 hsbyteclk_ps) - 4; 964 val = clamp(raw_val, 0, 15); 965 dev_dbg(dev, "THS_TRAILCNT: %u\n", val); 966 tc358768_write(priv, TC358768_THS_TRAILCNT, val); 967 968 val = BIT(0); 969 for (i = 0; i < dsi_dev->lanes; i++) 970 val |= BIT(i + 1); 971 tc358768_write(priv, TC358768_HSTXVREGEN, val); 972 973 tc358768_write(priv, TC358768_TXOPTIONCNTRL, 974 (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) ? 0 : BIT(0)); 975 976 /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */ 977 val = tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps * 4); 978 val = tc358768_ns_to_cnt(val, hsbyteclk_ps) / 4 - 1; 979 dev_dbg(dev, "TXTAGOCNT: %u\n", val); 980 val2 = tc358768_ns_to_cnt(tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps), 981 hsbyteclk_ps) - 2; 982 dev_dbg(dev, "RXTASURECNT: %u\n", val2); 983 val = val << 16 | val2; 984 tc358768_write(priv, TC358768_BTACNTRL1, val); 985 986 /* START[0] */ 987 tc358768_write(priv, TC358768_STARTCNTRL, 1); 988 989 if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { 990 /* Set pulse mode */ 991 tc358768_write(priv, TC358768_DSI_EVENT, 0); 992 993 /* vact */ 994 tc358768_write(priv, TC358768_DSI_VACT, vm.vactive); 995 996 /* vsw */ 997 tc358768_write(priv, TC358768_DSI_VSW, vm.vsync_len); 998 999 /* vbp */ 1000 tc358768_write(priv, TC358768_DSI_VBPR, vm.vback_porch); 1001 } else { 1002 /* Set event mode */ 1003 tc358768_write(priv, TC358768_DSI_EVENT, 1); 1004 1005 /* vact */ 1006 tc358768_write(priv, TC358768_DSI_VACT, vm.vactive); 1007 1008 /* vsw (+ vbp) */ 1009 tc358768_write(priv, TC358768_DSI_VSW, 1010 vm.vsync_len + vm.vback_porch); 1011 1012 /* vbp (not used in event mode) */ 1013 tc358768_write(priv, TC358768_DSI_VBPR, 0); 1014 } 1015 1016 /* hsw (bytes) */ 1017 tc358768_write(priv, TC358768_DSI_HSW, dsi_hsw); 1018 1019 /* hbp (bytes) */ 1020 tc358768_write(priv, TC358768_DSI_HBPR, dsi_hbp); 1021 1022 /* hact (bytes) */ 1023 tc358768_write(priv, TC358768_DSI_HACT, hact); 1024 1025 /* VSYNC polarity */ 1026 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5), 1027 (mode->flags & DRM_MODE_FLAG_PVSYNC) ? BIT(5) : 0); 1028 1029 /* HSYNC polarity */ 1030 tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0), 1031 (mode->flags & DRM_MODE_FLAG_PHSYNC) ? BIT(0) : 0); 1032 1033 /* Start DSI Tx */ 1034 tc358768_write(priv, TC358768_DSI_START, 0x1); 1035 1036 /* Configure DSI_Control register */ 1037 val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL; 1038 val |= TC358768_DSI_CONTROL_TXMD | TC358768_DSI_CONTROL_HSCKMD | 1039 0x3 << 1 | TC358768_DSI_CONTROL_EOTDIS; 1040 tc358768_write(priv, TC358768_DSI_CONFW, val); 1041 1042 val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL; 1043 val |= (dsi_dev->lanes - 1) << 1; 1044 1045 val |= TC358768_DSI_CONTROL_TXMD; 1046 1047 if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)) 1048 val |= TC358768_DSI_CONTROL_HSCKMD; 1049 1050 if (dsi_dev->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET) 1051 val |= TC358768_DSI_CONTROL_EOTDIS; 1052 1053 tc358768_write(priv, TC358768_DSI_CONFW, val); 1054 1055 val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL; 1056 val |= TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */ 1057 tc358768_write(priv, TC358768_DSI_CONFW, val); 1058 1059 ret = tc358768_clear_error(priv); 1060 if (ret) { 1061 dev_err(dev, "Bridge pre_enable failed: %d\n", ret); 1062 tc358768_bridge_disable(bridge); 1063 tc358768_bridge_post_disable(bridge); 1064 } 1065 } 1066 1067 static void tc358768_bridge_enable(struct drm_bridge *bridge) 1068 { 1069 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 1070 int ret; 1071 1072 if (!priv->enabled) { 1073 dev_err(priv->dev, "Bridge is not enabled\n"); 1074 return; 1075 } 1076 1077 /* clear FrmStop and RstPtr */ 1078 tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0); 1079 1080 /* set PP_en */ 1081 tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), BIT(6)); 1082 1083 ret = tc358768_clear_error(priv); 1084 if (ret) { 1085 dev_err(priv->dev, "Bridge enable failed: %d\n", ret); 1086 tc358768_bridge_disable(bridge); 1087 tc358768_bridge_post_disable(bridge); 1088 } 1089 } 1090 1091 #define MAX_INPUT_SEL_FORMATS 1 1092 1093 static u32 * 1094 tc358768_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 1095 struct drm_bridge_state *bridge_state, 1096 struct drm_crtc_state *crtc_state, 1097 struct drm_connector_state *conn_state, 1098 u32 output_fmt, 1099 unsigned int *num_input_fmts) 1100 { 1101 struct tc358768_priv *priv = bridge_to_tc358768(bridge); 1102 u32 *input_fmts; 1103 1104 *num_input_fmts = 0; 1105 1106 input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts), 1107 GFP_KERNEL); 1108 if (!input_fmts) 1109 return NULL; 1110 1111 switch (priv->pd_lines) { 1112 case 16: 1113 input_fmts[0] = MEDIA_BUS_FMT_RGB565_1X16; 1114 break; 1115 case 18: 1116 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X18; 1117 break; 1118 default: 1119 case 24: 1120 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24; 1121 break; 1122 } 1123 1124 *num_input_fmts = MAX_INPUT_SEL_FORMATS; 1125 1126 return input_fmts; 1127 } 1128 1129 static const struct drm_bridge_funcs tc358768_bridge_funcs = { 1130 .attach = tc358768_bridge_attach, 1131 .mode_valid = tc358768_bridge_mode_valid, 1132 .pre_enable = tc358768_bridge_pre_enable, 1133 .enable = tc358768_bridge_enable, 1134 .disable = tc358768_bridge_disable, 1135 .post_disable = tc358768_bridge_post_disable, 1136 1137 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 1138 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 1139 .atomic_reset = drm_atomic_helper_bridge_reset, 1140 .atomic_get_input_bus_fmts = tc358768_atomic_get_input_bus_fmts, 1141 }; 1142 1143 static const struct drm_bridge_timings default_tc358768_timings = { 1144 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE 1145 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE 1146 | DRM_BUS_FLAG_DE_HIGH, 1147 }; 1148 1149 static bool tc358768_is_reserved_reg(unsigned int reg) 1150 { 1151 switch (reg) { 1152 case 0x114 ... 0x13f: 1153 case 0x200: 1154 case 0x20c: 1155 case 0x400 ... 0x408: 1156 case 0x41c ... 0x42f: 1157 return true; 1158 default: 1159 return false; 1160 } 1161 } 1162 1163 static bool tc358768_writeable_reg(struct device *dev, unsigned int reg) 1164 { 1165 if (tc358768_is_reserved_reg(reg)) 1166 return false; 1167 1168 switch (reg) { 1169 case TC358768_CHIPID: 1170 case TC358768_FIFOSTATUS: 1171 case TC358768_DSITXSTATUS ... (TC358768_DSITXSTATUS + 2): 1172 case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2): 1173 case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2): 1174 return false; 1175 default: 1176 return true; 1177 } 1178 } 1179 1180 static bool tc358768_readable_reg(struct device *dev, unsigned int reg) 1181 { 1182 if (tc358768_is_reserved_reg(reg)) 1183 return false; 1184 1185 switch (reg) { 1186 case TC358768_STARTCNTRL: 1187 case TC358768_DSI_CONFW ... (TC358768_DSI_CONFW + 2): 1188 case TC358768_DSI_INT_CLR ... (TC358768_DSI_INT_CLR + 2): 1189 case TC358768_DSI_START ... (TC358768_DSI_START + 2): 1190 case TC358768_DBG_DATA: 1191 return false; 1192 default: 1193 return true; 1194 } 1195 } 1196 1197 static const struct regmap_config tc358768_regmap_config = { 1198 .name = "tc358768", 1199 .reg_bits = 16, 1200 .val_bits = 16, 1201 .max_register = TC358768_DSI_HACT, 1202 .cache_type = REGCACHE_NONE, 1203 .writeable_reg = tc358768_writeable_reg, 1204 .readable_reg = tc358768_readable_reg, 1205 .reg_format_endian = REGMAP_ENDIAN_BIG, 1206 .val_format_endian = REGMAP_ENDIAN_BIG, 1207 }; 1208 1209 static const struct i2c_device_id tc358768_i2c_ids[] = { 1210 { "tc358768", 0 }, 1211 { "tc358778", 0 }, 1212 { } 1213 }; 1214 MODULE_DEVICE_TABLE(i2c, tc358768_i2c_ids); 1215 1216 static const struct of_device_id tc358768_of_ids[] = { 1217 { .compatible = "toshiba,tc358768", }, 1218 { .compatible = "toshiba,tc358778", }, 1219 { } 1220 }; 1221 MODULE_DEVICE_TABLE(of, tc358768_of_ids); 1222 1223 static int tc358768_get_regulators(struct tc358768_priv *priv) 1224 { 1225 int i, ret; 1226 1227 for (i = 0; i < ARRAY_SIZE(priv->supplies); ++i) 1228 priv->supplies[i].supply = tc358768_supplies[i]; 1229 1230 ret = devm_regulator_bulk_get(priv->dev, ARRAY_SIZE(priv->supplies), 1231 priv->supplies); 1232 if (ret < 0) 1233 dev_err(priv->dev, "failed to get regulators: %d\n", ret); 1234 1235 return ret; 1236 } 1237 1238 static int tc358768_i2c_probe(struct i2c_client *client) 1239 { 1240 struct tc358768_priv *priv; 1241 struct device *dev = &client->dev; 1242 struct device_node *np = dev->of_node; 1243 int ret; 1244 1245 if (!np) 1246 return -ENODEV; 1247 1248 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 1249 if (!priv) 1250 return -ENOMEM; 1251 1252 dev_set_drvdata(dev, priv); 1253 priv->dev = dev; 1254 1255 ret = tc358768_get_regulators(priv); 1256 if (ret) 1257 return ret; 1258 1259 priv->refclk = devm_clk_get(dev, "refclk"); 1260 if (IS_ERR(priv->refclk)) 1261 return PTR_ERR(priv->refclk); 1262 1263 /* 1264 * RESX is low active, to disable tc358768 initially (keep in reset) 1265 * the gpio line must be LOW. This is the ASSERTED state of 1266 * GPIO_ACTIVE_LOW (GPIOD_OUT_HIGH == ASSERTED). 1267 */ 1268 priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", 1269 GPIOD_OUT_HIGH); 1270 if (IS_ERR(priv->reset_gpio)) 1271 return PTR_ERR(priv->reset_gpio); 1272 1273 priv->regmap = devm_regmap_init_i2c(client, &tc358768_regmap_config); 1274 if (IS_ERR(priv->regmap)) { 1275 dev_err(dev, "Failed to init regmap\n"); 1276 return PTR_ERR(priv->regmap); 1277 } 1278 1279 priv->dsi_host.dev = dev; 1280 priv->dsi_host.ops = &tc358768_dsi_host_ops; 1281 1282 priv->bridge.funcs = &tc358768_bridge_funcs; 1283 priv->bridge.timings = &default_tc358768_timings; 1284 priv->bridge.of_node = np; 1285 1286 i2c_set_clientdata(client, priv); 1287 1288 return mipi_dsi_host_register(&priv->dsi_host); 1289 } 1290 1291 static void tc358768_i2c_remove(struct i2c_client *client) 1292 { 1293 struct tc358768_priv *priv = i2c_get_clientdata(client); 1294 1295 mipi_dsi_host_unregister(&priv->dsi_host); 1296 } 1297 1298 static struct i2c_driver tc358768_driver = { 1299 .driver = { 1300 .name = "tc358768", 1301 .of_match_table = tc358768_of_ids, 1302 }, 1303 .id_table = tc358768_i2c_ids, 1304 .probe = tc358768_i2c_probe, 1305 .remove = tc358768_i2c_remove, 1306 }; 1307 module_i2c_driver(tc358768_driver); 1308 1309 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); 1310 MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge"); 1311 MODULE_LICENSE("GPL v2"); 1312