1 /* 2 * Copyright (C) 2013 NVIDIA Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/debugfs.h> 11 #include <linux/host1x.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/of_platform.h> 15 #include <linux/platform_device.h> 16 #include <linux/reset.h> 17 18 #include <linux/regulator/consumer.h> 19 20 #include <drm/drm_atomic_helper.h> 21 #include <drm/drm_mipi_dsi.h> 22 #include <drm/drm_panel.h> 23 24 #include <video/mipi_display.h> 25 26 #include "dc.h" 27 #include "drm.h" 28 #include "dsi.h" 29 #include "mipi-phy.h" 30 31 struct tegra_dsi_state { 32 struct drm_connector_state base; 33 34 struct mipi_dphy_timing timing; 35 unsigned long period; 36 37 unsigned int vrefresh; 38 unsigned int lanes; 39 unsigned long pclk; 40 unsigned long bclk; 41 42 enum tegra_dsi_format format; 43 unsigned int mul; 44 unsigned int div; 45 }; 46 47 static inline struct tegra_dsi_state * 48 to_dsi_state(struct drm_connector_state *state) 49 { 50 return container_of(state, struct tegra_dsi_state, base); 51 } 52 53 struct tegra_dsi { 54 struct host1x_client client; 55 struct tegra_output output; 56 struct device *dev; 57 58 void __iomem *regs; 59 60 struct reset_control *rst; 61 struct clk *clk_parent; 62 struct clk *clk_lp; 63 struct clk *clk; 64 65 struct drm_info_list *debugfs_files; 66 struct drm_minor *minor; 67 struct dentry *debugfs; 68 69 unsigned long flags; 70 enum mipi_dsi_pixel_format format; 71 unsigned int lanes; 72 73 struct tegra_mipi_device *mipi; 74 struct mipi_dsi_host host; 75 76 struct regulator *vdd; 77 78 unsigned int video_fifo_depth; 79 unsigned int host_fifo_depth; 80 81 /* for ganged-mode support */ 82 struct tegra_dsi *master; 83 struct tegra_dsi *slave; 84 }; 85 86 static inline struct tegra_dsi * 87 host1x_client_to_dsi(struct host1x_client *client) 88 { 89 return container_of(client, struct tegra_dsi, client); 90 } 91 92 static inline struct tegra_dsi *host_to_tegra(struct mipi_dsi_host *host) 93 { 94 return container_of(host, struct tegra_dsi, host); 95 } 96 97 static inline struct tegra_dsi *to_dsi(struct tegra_output *output) 98 { 99 return container_of(output, struct tegra_dsi, output); 100 } 101 102 static struct tegra_dsi_state *tegra_dsi_get_state(struct tegra_dsi *dsi) 103 { 104 return to_dsi_state(dsi->output.connector.state); 105 } 106 107 static inline u32 tegra_dsi_readl(struct tegra_dsi *dsi, unsigned long reg) 108 { 109 return readl(dsi->regs + (reg << 2)); 110 } 111 112 static inline void tegra_dsi_writel(struct tegra_dsi *dsi, u32 value, 113 unsigned long reg) 114 { 115 writel(value, dsi->regs + (reg << 2)); 116 } 117 118 static int tegra_dsi_show_regs(struct seq_file *s, void *data) 119 { 120 struct drm_info_node *node = s->private; 121 struct tegra_dsi *dsi = node->info_ent->data; 122 struct drm_crtc *crtc = dsi->output.encoder.crtc; 123 struct drm_device *drm = node->minor->dev; 124 int err = 0; 125 126 drm_modeset_lock_all(drm); 127 128 if (!crtc || !crtc->state->active) { 129 err = -EBUSY; 130 goto unlock; 131 } 132 133 #define DUMP_REG(name) \ 134 seq_printf(s, "%-32s %#05x %08x\n", #name, name, \ 135 tegra_dsi_readl(dsi, name)) 136 137 DUMP_REG(DSI_INCR_SYNCPT); 138 DUMP_REG(DSI_INCR_SYNCPT_CONTROL); 139 DUMP_REG(DSI_INCR_SYNCPT_ERROR); 140 DUMP_REG(DSI_CTXSW); 141 DUMP_REG(DSI_RD_DATA); 142 DUMP_REG(DSI_WR_DATA); 143 DUMP_REG(DSI_POWER_CONTROL); 144 DUMP_REG(DSI_INT_ENABLE); 145 DUMP_REG(DSI_INT_STATUS); 146 DUMP_REG(DSI_INT_MASK); 147 DUMP_REG(DSI_HOST_CONTROL); 148 DUMP_REG(DSI_CONTROL); 149 DUMP_REG(DSI_SOL_DELAY); 150 DUMP_REG(DSI_MAX_THRESHOLD); 151 DUMP_REG(DSI_TRIGGER); 152 DUMP_REG(DSI_TX_CRC); 153 DUMP_REG(DSI_STATUS); 154 155 DUMP_REG(DSI_INIT_SEQ_CONTROL); 156 DUMP_REG(DSI_INIT_SEQ_DATA_0); 157 DUMP_REG(DSI_INIT_SEQ_DATA_1); 158 DUMP_REG(DSI_INIT_SEQ_DATA_2); 159 DUMP_REG(DSI_INIT_SEQ_DATA_3); 160 DUMP_REG(DSI_INIT_SEQ_DATA_4); 161 DUMP_REG(DSI_INIT_SEQ_DATA_5); 162 DUMP_REG(DSI_INIT_SEQ_DATA_6); 163 DUMP_REG(DSI_INIT_SEQ_DATA_7); 164 165 DUMP_REG(DSI_PKT_SEQ_0_LO); 166 DUMP_REG(DSI_PKT_SEQ_0_HI); 167 DUMP_REG(DSI_PKT_SEQ_1_LO); 168 DUMP_REG(DSI_PKT_SEQ_1_HI); 169 DUMP_REG(DSI_PKT_SEQ_2_LO); 170 DUMP_REG(DSI_PKT_SEQ_2_HI); 171 DUMP_REG(DSI_PKT_SEQ_3_LO); 172 DUMP_REG(DSI_PKT_SEQ_3_HI); 173 DUMP_REG(DSI_PKT_SEQ_4_LO); 174 DUMP_REG(DSI_PKT_SEQ_4_HI); 175 DUMP_REG(DSI_PKT_SEQ_5_LO); 176 DUMP_REG(DSI_PKT_SEQ_5_HI); 177 178 DUMP_REG(DSI_DCS_CMDS); 179 180 DUMP_REG(DSI_PKT_LEN_0_1); 181 DUMP_REG(DSI_PKT_LEN_2_3); 182 DUMP_REG(DSI_PKT_LEN_4_5); 183 DUMP_REG(DSI_PKT_LEN_6_7); 184 185 DUMP_REG(DSI_PHY_TIMING_0); 186 DUMP_REG(DSI_PHY_TIMING_1); 187 DUMP_REG(DSI_PHY_TIMING_2); 188 DUMP_REG(DSI_BTA_TIMING); 189 190 DUMP_REG(DSI_TIMEOUT_0); 191 DUMP_REG(DSI_TIMEOUT_1); 192 DUMP_REG(DSI_TO_TALLY); 193 194 DUMP_REG(DSI_PAD_CONTROL_0); 195 DUMP_REG(DSI_PAD_CONTROL_CD); 196 DUMP_REG(DSI_PAD_CD_STATUS); 197 DUMP_REG(DSI_VIDEO_MODE_CONTROL); 198 DUMP_REG(DSI_PAD_CONTROL_1); 199 DUMP_REG(DSI_PAD_CONTROL_2); 200 DUMP_REG(DSI_PAD_CONTROL_3); 201 DUMP_REG(DSI_PAD_CONTROL_4); 202 203 DUMP_REG(DSI_GANGED_MODE_CONTROL); 204 DUMP_REG(DSI_GANGED_MODE_START); 205 DUMP_REG(DSI_GANGED_MODE_SIZE); 206 207 DUMP_REG(DSI_RAW_DATA_BYTE_COUNT); 208 DUMP_REG(DSI_ULTRA_LOW_POWER_CONTROL); 209 210 DUMP_REG(DSI_INIT_SEQ_DATA_8); 211 DUMP_REG(DSI_INIT_SEQ_DATA_9); 212 DUMP_REG(DSI_INIT_SEQ_DATA_10); 213 DUMP_REG(DSI_INIT_SEQ_DATA_11); 214 DUMP_REG(DSI_INIT_SEQ_DATA_12); 215 DUMP_REG(DSI_INIT_SEQ_DATA_13); 216 DUMP_REG(DSI_INIT_SEQ_DATA_14); 217 DUMP_REG(DSI_INIT_SEQ_DATA_15); 218 219 #undef DUMP_REG 220 221 unlock: 222 drm_modeset_unlock_all(drm); 223 return err; 224 } 225 226 static struct drm_info_list debugfs_files[] = { 227 { "regs", tegra_dsi_show_regs, 0, NULL }, 228 }; 229 230 static int tegra_dsi_debugfs_init(struct tegra_dsi *dsi, 231 struct drm_minor *minor) 232 { 233 const char *name = dev_name(dsi->dev); 234 unsigned int i; 235 int err; 236 237 dsi->debugfs = debugfs_create_dir(name, minor->debugfs_root); 238 if (!dsi->debugfs) 239 return -ENOMEM; 240 241 dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files), 242 GFP_KERNEL); 243 if (!dsi->debugfs_files) { 244 err = -ENOMEM; 245 goto remove; 246 } 247 248 for (i = 0; i < ARRAY_SIZE(debugfs_files); i++) 249 dsi->debugfs_files[i].data = dsi; 250 251 err = drm_debugfs_create_files(dsi->debugfs_files, 252 ARRAY_SIZE(debugfs_files), 253 dsi->debugfs, minor); 254 if (err < 0) 255 goto free; 256 257 dsi->minor = minor; 258 259 return 0; 260 261 free: 262 kfree(dsi->debugfs_files); 263 dsi->debugfs_files = NULL; 264 remove: 265 debugfs_remove(dsi->debugfs); 266 dsi->debugfs = NULL; 267 268 return err; 269 } 270 271 static void tegra_dsi_debugfs_exit(struct tegra_dsi *dsi) 272 { 273 drm_debugfs_remove_files(dsi->debugfs_files, ARRAY_SIZE(debugfs_files), 274 dsi->minor); 275 dsi->minor = NULL; 276 277 kfree(dsi->debugfs_files); 278 dsi->debugfs_files = NULL; 279 280 debugfs_remove(dsi->debugfs); 281 dsi->debugfs = NULL; 282 } 283 284 #define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9)) 285 #define PKT_LEN0(len) (((len) & 0x07) << 0) 286 #define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19)) 287 #define PKT_LEN1(len) (((len) & 0x07) << 10) 288 #define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29)) 289 #define PKT_LEN2(len) (((len) & 0x07) << 20) 290 291 #define PKT_LP (1 << 30) 292 #define NUM_PKT_SEQ 12 293 294 /* 295 * non-burst mode with sync pulses 296 */ 297 static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = { 298 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) | 299 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 300 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 301 PKT_LP, 302 [ 1] = 0, 303 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) | 304 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 305 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 306 PKT_LP, 307 [ 3] = 0, 308 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 309 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 310 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 311 PKT_LP, 312 [ 5] = 0, 313 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 314 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 315 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0), 316 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) | 317 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) | 318 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4), 319 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 320 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 321 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 322 PKT_LP, 323 [ 9] = 0, 324 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 325 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 326 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0), 327 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) | 328 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) | 329 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4), 330 }; 331 332 /* 333 * non-burst mode with sync events 334 */ 335 static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = { 336 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) | 337 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 338 PKT_LP, 339 [ 1] = 0, 340 [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 341 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 342 PKT_LP, 343 [ 3] = 0, 344 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 345 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 346 PKT_LP, 347 [ 5] = 0, 348 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 349 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) | 350 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3), 351 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4), 352 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 353 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 354 PKT_LP, 355 [ 9] = 0, 356 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 357 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) | 358 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3), 359 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4), 360 }; 361 362 static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = { 363 [ 0] = 0, 364 [ 1] = 0, 365 [ 2] = 0, 366 [ 3] = 0, 367 [ 4] = 0, 368 [ 5] = 0, 369 [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP, 370 [ 7] = 0, 371 [ 8] = 0, 372 [ 9] = 0, 373 [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP, 374 [11] = 0, 375 }; 376 377 static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi, 378 unsigned long period, 379 const struct mipi_dphy_timing *timing) 380 { 381 u32 value; 382 383 value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 | 384 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 | 385 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 | 386 DSI_TIMING_FIELD(timing->hsprepare, period, 1); 387 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0); 388 389 value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 | 390 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 | 391 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 | 392 DSI_TIMING_FIELD(timing->lpx, period, 1); 393 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1); 394 395 value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 | 396 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 | 397 DSI_TIMING_FIELD(0xff * period, period, 0) << 0; 398 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2); 399 400 value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 | 401 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 | 402 DSI_TIMING_FIELD(timing->tago, period, 1); 403 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING); 404 405 if (dsi->slave) 406 tegra_dsi_set_phy_timing(dsi->slave, period, timing); 407 } 408 409 static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format, 410 unsigned int *mulp, unsigned int *divp) 411 { 412 switch (format) { 413 case MIPI_DSI_FMT_RGB666_PACKED: 414 case MIPI_DSI_FMT_RGB888: 415 *mulp = 3; 416 *divp = 1; 417 break; 418 419 case MIPI_DSI_FMT_RGB565: 420 *mulp = 2; 421 *divp = 1; 422 break; 423 424 case MIPI_DSI_FMT_RGB666: 425 *mulp = 9; 426 *divp = 4; 427 break; 428 429 default: 430 return -EINVAL; 431 } 432 433 return 0; 434 } 435 436 static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format, 437 enum tegra_dsi_format *fmt) 438 { 439 switch (format) { 440 case MIPI_DSI_FMT_RGB888: 441 *fmt = TEGRA_DSI_FORMAT_24P; 442 break; 443 444 case MIPI_DSI_FMT_RGB666: 445 *fmt = TEGRA_DSI_FORMAT_18NP; 446 break; 447 448 case MIPI_DSI_FMT_RGB666_PACKED: 449 *fmt = TEGRA_DSI_FORMAT_18P; 450 break; 451 452 case MIPI_DSI_FMT_RGB565: 453 *fmt = TEGRA_DSI_FORMAT_16P; 454 break; 455 456 default: 457 return -EINVAL; 458 } 459 460 return 0; 461 } 462 463 static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start, 464 unsigned int size) 465 { 466 u32 value; 467 468 tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START); 469 tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE); 470 471 value = DSI_GANGED_MODE_CONTROL_ENABLE; 472 tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL); 473 } 474 475 static void tegra_dsi_enable(struct tegra_dsi *dsi) 476 { 477 u32 value; 478 479 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 480 value |= DSI_POWER_CONTROL_ENABLE; 481 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 482 483 if (dsi->slave) 484 tegra_dsi_enable(dsi->slave); 485 } 486 487 static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi) 488 { 489 if (dsi->master) 490 return dsi->master->lanes + dsi->lanes; 491 492 if (dsi->slave) 493 return dsi->lanes + dsi->slave->lanes; 494 495 return dsi->lanes; 496 } 497 498 static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe, 499 const struct drm_display_mode *mode) 500 { 501 unsigned int hact, hsw, hbp, hfp, i, mul, div; 502 struct tegra_dsi_state *state; 503 const u32 *pkt_seq; 504 u32 value; 505 506 /* XXX: pass in state into this function? */ 507 if (dsi->master) 508 state = tegra_dsi_get_state(dsi->master); 509 else 510 state = tegra_dsi_get_state(dsi); 511 512 mul = state->mul; 513 div = state->div; 514 515 if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { 516 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n"); 517 pkt_seq = pkt_seq_video_non_burst_sync_pulses; 518 } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) { 519 DRM_DEBUG_KMS("Non-burst video mode with sync events\n"); 520 pkt_seq = pkt_seq_video_non_burst_sync_events; 521 } else { 522 DRM_DEBUG_KMS("Command mode\n"); 523 pkt_seq = pkt_seq_command_mode; 524 } 525 526 value = DSI_CONTROL_CHANNEL(0) | 527 DSI_CONTROL_FORMAT(state->format) | 528 DSI_CONTROL_LANES(dsi->lanes - 1) | 529 DSI_CONTROL_SOURCE(pipe); 530 tegra_dsi_writel(dsi, value, DSI_CONTROL); 531 532 tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD); 533 534 value = DSI_HOST_CONTROL_HS; 535 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 536 537 value = tegra_dsi_readl(dsi, DSI_CONTROL); 538 539 if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) 540 value |= DSI_CONTROL_HS_CLK_CTRL; 541 542 value &= ~DSI_CONTROL_TX_TRIG(3); 543 544 /* enable DCS commands for command mode */ 545 if (dsi->flags & MIPI_DSI_MODE_VIDEO) 546 value &= ~DSI_CONTROL_DCS_ENABLE; 547 else 548 value |= DSI_CONTROL_DCS_ENABLE; 549 550 value |= DSI_CONTROL_VIDEO_ENABLE; 551 value &= ~DSI_CONTROL_HOST_ENABLE; 552 tegra_dsi_writel(dsi, value, DSI_CONTROL); 553 554 for (i = 0; i < NUM_PKT_SEQ; i++) 555 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i); 556 557 if (dsi->flags & MIPI_DSI_MODE_VIDEO) { 558 /* horizontal active pixels */ 559 hact = mode->hdisplay * mul / div; 560 561 /* horizontal sync width */ 562 hsw = (mode->hsync_end - mode->hsync_start) * mul / div; 563 564 /* horizontal back porch */ 565 hbp = (mode->htotal - mode->hsync_end) * mul / div; 566 567 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0) 568 hbp += hsw; 569 570 /* horizontal front porch */ 571 hfp = (mode->hsync_start - mode->hdisplay) * mul / div; 572 573 /* subtract packet overhead */ 574 hsw -= 10; 575 hbp -= 14; 576 hfp -= 8; 577 578 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1); 579 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3); 580 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5); 581 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7); 582 583 /* set SOL delay (for non-burst mode only) */ 584 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY); 585 586 /* TODO: implement ganged mode */ 587 } else { 588 u16 bytes; 589 590 if (dsi->master || dsi->slave) { 591 /* 592 * For ganged mode, assume symmetric left-right mode. 593 */ 594 bytes = 1 + (mode->hdisplay / 2) * mul / div; 595 } else { 596 /* 1 byte (DCS command) + pixel data */ 597 bytes = 1 + mode->hdisplay * mul / div; 598 } 599 600 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1); 601 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3); 602 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5); 603 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7); 604 605 value = MIPI_DCS_WRITE_MEMORY_START << 8 | 606 MIPI_DCS_WRITE_MEMORY_CONTINUE; 607 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS); 608 609 /* set SOL delay */ 610 if (dsi->master || dsi->slave) { 611 unsigned long delay, bclk, bclk_ganged; 612 unsigned int lanes = state->lanes; 613 614 /* SOL to valid, valid to FIFO and FIFO write delay */ 615 delay = 4 + 4 + 2; 616 delay = DIV_ROUND_UP(delay * mul, div * lanes); 617 /* FIFO read delay */ 618 delay = delay + 6; 619 620 bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes); 621 bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes); 622 value = bclk - bclk_ganged + delay + 20; 623 } else { 624 /* TODO: revisit for non-ganged mode */ 625 value = 8 * mul / div; 626 } 627 628 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY); 629 } 630 631 if (dsi->slave) { 632 tegra_dsi_configure(dsi->slave, pipe, mode); 633 634 /* 635 * TODO: Support modes other than symmetrical left-right 636 * split. 637 */ 638 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2); 639 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2, 640 mode->hdisplay / 2); 641 } 642 } 643 644 static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout) 645 { 646 u32 value; 647 648 timeout = jiffies + msecs_to_jiffies(timeout); 649 650 while (time_before(jiffies, timeout)) { 651 value = tegra_dsi_readl(dsi, DSI_STATUS); 652 if (value & DSI_STATUS_IDLE) 653 return 0; 654 655 usleep_range(1000, 2000); 656 } 657 658 return -ETIMEDOUT; 659 } 660 661 static void tegra_dsi_video_disable(struct tegra_dsi *dsi) 662 { 663 u32 value; 664 665 value = tegra_dsi_readl(dsi, DSI_CONTROL); 666 value &= ~DSI_CONTROL_VIDEO_ENABLE; 667 tegra_dsi_writel(dsi, value, DSI_CONTROL); 668 669 if (dsi->slave) 670 tegra_dsi_video_disable(dsi->slave); 671 } 672 673 static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi) 674 { 675 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START); 676 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE); 677 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL); 678 } 679 680 static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk, 681 unsigned int vrefresh) 682 { 683 unsigned int timeout; 684 u32 value; 685 686 /* one frame high-speed transmission timeout */ 687 timeout = (bclk / vrefresh) / 512; 688 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout); 689 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0); 690 691 /* 2 ms peripheral timeout for panel */ 692 timeout = 2 * bclk / 512 * 1000; 693 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000); 694 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1); 695 696 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0); 697 tegra_dsi_writel(dsi, value, DSI_TO_TALLY); 698 699 if (dsi->slave) 700 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh); 701 } 702 703 static void tegra_dsi_disable(struct tegra_dsi *dsi) 704 { 705 u32 value; 706 707 if (dsi->slave) { 708 tegra_dsi_ganged_disable(dsi->slave); 709 tegra_dsi_ganged_disable(dsi); 710 } 711 712 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 713 value &= ~DSI_POWER_CONTROL_ENABLE; 714 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 715 716 if (dsi->slave) 717 tegra_dsi_disable(dsi->slave); 718 719 usleep_range(5000, 10000); 720 } 721 722 static void tegra_dsi_soft_reset(struct tegra_dsi *dsi) 723 { 724 u32 value; 725 726 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 727 value &= ~DSI_POWER_CONTROL_ENABLE; 728 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 729 730 usleep_range(300, 1000); 731 732 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 733 value |= DSI_POWER_CONTROL_ENABLE; 734 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 735 736 usleep_range(300, 1000); 737 738 value = tegra_dsi_readl(dsi, DSI_TRIGGER); 739 if (value) 740 tegra_dsi_writel(dsi, 0, DSI_TRIGGER); 741 742 if (dsi->slave) 743 tegra_dsi_soft_reset(dsi->slave); 744 } 745 746 static void tegra_dsi_connector_reset(struct drm_connector *connector) 747 { 748 struct tegra_dsi_state *state; 749 750 kfree(connector->state); 751 connector->state = NULL; 752 753 state = kzalloc(sizeof(*state), GFP_KERNEL); 754 if (state) 755 connector->state = &state->base; 756 } 757 758 static struct drm_connector_state * 759 tegra_dsi_connector_duplicate_state(struct drm_connector *connector) 760 { 761 struct tegra_dsi_state *state = to_dsi_state(connector->state); 762 struct tegra_dsi_state *copy; 763 764 copy = kmemdup(state, sizeof(*state), GFP_KERNEL); 765 if (!copy) 766 return NULL; 767 768 return ©->base; 769 } 770 771 static const struct drm_connector_funcs tegra_dsi_connector_funcs = { 772 .dpms = drm_atomic_helper_connector_dpms, 773 .reset = tegra_dsi_connector_reset, 774 .detect = tegra_output_connector_detect, 775 .fill_modes = drm_helper_probe_single_connector_modes, 776 .destroy = tegra_output_connector_destroy, 777 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state, 778 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 779 }; 780 781 static enum drm_mode_status 782 tegra_dsi_connector_mode_valid(struct drm_connector *connector, 783 struct drm_display_mode *mode) 784 { 785 return MODE_OK; 786 } 787 788 static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = { 789 .get_modes = tegra_output_connector_get_modes, 790 .mode_valid = tegra_dsi_connector_mode_valid, 791 .best_encoder = tegra_output_connector_best_encoder, 792 }; 793 794 static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = { 795 .destroy = tegra_output_encoder_destroy, 796 }; 797 798 static void tegra_dsi_encoder_disable(struct drm_encoder *encoder) 799 { 800 struct tegra_output *output = encoder_to_output(encoder); 801 struct tegra_dc *dc = to_tegra_dc(encoder->crtc); 802 struct tegra_dsi *dsi = to_dsi(output); 803 u32 value; 804 int err; 805 806 if (output->panel) 807 drm_panel_disable(output->panel); 808 809 tegra_dsi_video_disable(dsi); 810 811 /* 812 * The following accesses registers of the display controller, so make 813 * sure it's only executed when the output is attached to one. 814 */ 815 if (dc) { 816 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS); 817 value &= ~DSI_ENABLE; 818 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS); 819 820 tegra_dc_commit(dc); 821 } 822 823 err = tegra_dsi_wait_idle(dsi, 100); 824 if (err < 0) 825 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err); 826 827 tegra_dsi_soft_reset(dsi); 828 829 if (output->panel) 830 drm_panel_unprepare(output->panel); 831 832 tegra_dsi_disable(dsi); 833 834 return; 835 } 836 837 static void tegra_dsi_encoder_enable(struct drm_encoder *encoder) 838 { 839 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode; 840 struct tegra_output *output = encoder_to_output(encoder); 841 struct tegra_dc *dc = to_tegra_dc(encoder->crtc); 842 struct tegra_dsi *dsi = to_dsi(output); 843 struct tegra_dsi_state *state; 844 u32 value; 845 846 state = tegra_dsi_get_state(dsi); 847 848 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh); 849 850 /* 851 * The D-PHY timing fields are expressed in byte-clock cycles, so 852 * multiply the period by 8. 853 */ 854 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing); 855 856 if (output->panel) 857 drm_panel_prepare(output->panel); 858 859 tegra_dsi_configure(dsi, dc->pipe, mode); 860 861 /* enable display controller */ 862 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS); 863 value |= DSI_ENABLE; 864 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS); 865 866 tegra_dc_commit(dc); 867 868 /* enable DSI controller */ 869 tegra_dsi_enable(dsi); 870 871 if (output->panel) 872 drm_panel_enable(output->panel); 873 874 return; 875 } 876 877 static int 878 tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder, 879 struct drm_crtc_state *crtc_state, 880 struct drm_connector_state *conn_state) 881 { 882 struct tegra_output *output = encoder_to_output(encoder); 883 struct tegra_dsi_state *state = to_dsi_state(conn_state); 884 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc); 885 struct tegra_dsi *dsi = to_dsi(output); 886 unsigned int scdiv; 887 unsigned long plld; 888 int err; 889 890 state->pclk = crtc_state->mode.clock * 1000; 891 892 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div); 893 if (err < 0) 894 return err; 895 896 state->lanes = tegra_dsi_get_lanes(dsi); 897 898 err = tegra_dsi_get_format(dsi->format, &state->format); 899 if (err < 0) 900 return err; 901 902 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode); 903 904 /* compute byte clock */ 905 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes); 906 907 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div, 908 state->lanes); 909 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format, 910 state->vrefresh); 911 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk); 912 913 /* 914 * Compute bit clock and round up to the next MHz. 915 */ 916 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC; 917 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld); 918 919 err = mipi_dphy_timing_get_default(&state->timing, state->period); 920 if (err < 0) 921 return err; 922 923 err = mipi_dphy_timing_validate(&state->timing, state->period); 924 if (err < 0) { 925 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err); 926 return err; 927 } 928 929 /* 930 * We divide the frequency by two here, but we make up for that by 931 * setting the shift clock divider (further below) to half of the 932 * correct value. 933 */ 934 plld /= 2; 935 936 /* 937 * Derive pixel clock from bit clock using the shift clock divider. 938 * Note that this is only half of what we would expect, but we need 939 * that to make up for the fact that we divided the bit clock by a 940 * factor of two above. 941 * 942 * It's not clear exactly why this is necessary, but the display is 943 * not working properly otherwise. Perhaps the PLLs cannot generate 944 * frequencies sufficiently high. 945 */ 946 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2; 947 948 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent, 949 plld, scdiv); 950 if (err < 0) { 951 dev_err(output->dev, "failed to setup CRTC state: %d\n", err); 952 return err; 953 } 954 955 return err; 956 } 957 958 static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = { 959 .disable = tegra_dsi_encoder_disable, 960 .enable = tegra_dsi_encoder_enable, 961 .atomic_check = tegra_dsi_encoder_atomic_check, 962 }; 963 964 static int tegra_dsi_pad_enable(struct tegra_dsi *dsi) 965 { 966 u32 value; 967 968 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0); 969 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0); 970 971 return 0; 972 } 973 974 static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi) 975 { 976 u32 value; 977 978 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0); 979 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1); 980 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2); 981 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3); 982 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4); 983 984 /* start calibration */ 985 tegra_dsi_pad_enable(dsi); 986 987 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) | 988 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) | 989 DSI_PAD_OUT_CLK(0x0); 990 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2); 991 992 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) | 993 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3); 994 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3); 995 996 return tegra_mipi_calibrate(dsi->mipi); 997 } 998 999 static int tegra_dsi_init(struct host1x_client *client) 1000 { 1001 struct drm_device *drm = dev_get_drvdata(client->parent); 1002 struct tegra_dsi *dsi = host1x_client_to_dsi(client); 1003 int err; 1004 1005 reset_control_deassert(dsi->rst); 1006 1007 err = tegra_dsi_pad_calibrate(dsi); 1008 if (err < 0) { 1009 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err); 1010 goto reset; 1011 } 1012 1013 /* Gangsters must not register their own outputs. */ 1014 if (!dsi->master) { 1015 dsi->output.dev = client->dev; 1016 1017 drm_connector_init(drm, &dsi->output.connector, 1018 &tegra_dsi_connector_funcs, 1019 DRM_MODE_CONNECTOR_DSI); 1020 drm_connector_helper_add(&dsi->output.connector, 1021 &tegra_dsi_connector_helper_funcs); 1022 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF; 1023 1024 drm_encoder_init(drm, &dsi->output.encoder, 1025 &tegra_dsi_encoder_funcs, 1026 DRM_MODE_ENCODER_DSI); 1027 drm_encoder_helper_add(&dsi->output.encoder, 1028 &tegra_dsi_encoder_helper_funcs); 1029 1030 drm_mode_connector_attach_encoder(&dsi->output.connector, 1031 &dsi->output.encoder); 1032 drm_connector_register(&dsi->output.connector); 1033 1034 err = tegra_output_init(drm, &dsi->output); 1035 if (err < 0) { 1036 dev_err(client->dev, 1037 "failed to initialize output: %d\n", 1038 err); 1039 goto reset; 1040 } 1041 1042 dsi->output.encoder.possible_crtcs = 0x3; 1043 } 1044 1045 if (IS_ENABLED(CONFIG_DEBUG_FS)) { 1046 err = tegra_dsi_debugfs_init(dsi, drm->primary); 1047 if (err < 0) 1048 dev_err(dsi->dev, "debugfs setup failed: %d\n", err); 1049 } 1050 1051 return 0; 1052 1053 reset: 1054 reset_control_assert(dsi->rst); 1055 return err; 1056 } 1057 1058 static int tegra_dsi_exit(struct host1x_client *client) 1059 { 1060 struct tegra_dsi *dsi = host1x_client_to_dsi(client); 1061 1062 tegra_output_exit(&dsi->output); 1063 1064 if (IS_ENABLED(CONFIG_DEBUG_FS)) 1065 tegra_dsi_debugfs_exit(dsi); 1066 1067 reset_control_assert(dsi->rst); 1068 1069 return 0; 1070 } 1071 1072 static const struct host1x_client_ops dsi_client_ops = { 1073 .init = tegra_dsi_init, 1074 .exit = tegra_dsi_exit, 1075 }; 1076 1077 static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi) 1078 { 1079 struct clk *parent; 1080 int err; 1081 1082 parent = clk_get_parent(dsi->clk); 1083 if (!parent) 1084 return -EINVAL; 1085 1086 err = clk_set_parent(parent, dsi->clk_parent); 1087 if (err < 0) 1088 return err; 1089 1090 return 0; 1091 } 1092 1093 static const char * const error_report[16] = { 1094 "SoT Error", 1095 "SoT Sync Error", 1096 "EoT Sync Error", 1097 "Escape Mode Entry Command Error", 1098 "Low-Power Transmit Sync Error", 1099 "Peripheral Timeout Error", 1100 "False Control Error", 1101 "Contention Detected", 1102 "ECC Error, single-bit", 1103 "ECC Error, multi-bit", 1104 "Checksum Error", 1105 "DSI Data Type Not Recognized", 1106 "DSI VC ID Invalid", 1107 "Invalid Transmission Length", 1108 "Reserved", 1109 "DSI Protocol Violation", 1110 }; 1111 1112 static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi, 1113 const struct mipi_dsi_msg *msg, 1114 size_t count) 1115 { 1116 u8 *rx = msg->rx_buf; 1117 unsigned int i, j, k; 1118 size_t size = 0; 1119 u16 errors; 1120 u32 value; 1121 1122 /* read and parse packet header */ 1123 value = tegra_dsi_readl(dsi, DSI_RD_DATA); 1124 1125 switch (value & 0x3f) { 1126 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT: 1127 errors = (value >> 8) & 0xffff; 1128 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n", 1129 errors); 1130 for (i = 0; i < ARRAY_SIZE(error_report); i++) 1131 if (errors & BIT(i)) 1132 dev_dbg(dsi->dev, " %2u: %s\n", i, 1133 error_report[i]); 1134 break; 1135 1136 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE: 1137 rx[0] = (value >> 8) & 0xff; 1138 size = 1; 1139 break; 1140 1141 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE: 1142 rx[0] = (value >> 8) & 0xff; 1143 rx[1] = (value >> 16) & 0xff; 1144 size = 2; 1145 break; 1146 1147 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE: 1148 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff); 1149 break; 1150 1151 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE: 1152 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff); 1153 break; 1154 1155 default: 1156 dev_err(dsi->dev, "unhandled response type: %02x\n", 1157 value & 0x3f); 1158 return -EPROTO; 1159 } 1160 1161 size = min(size, msg->rx_len); 1162 1163 if (msg->rx_buf && size > 0) { 1164 for (i = 0, j = 0; i < count - 1; i++, j += 4) { 1165 u8 *rx = msg->rx_buf + j; 1166 1167 value = tegra_dsi_readl(dsi, DSI_RD_DATA); 1168 1169 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++) 1170 rx[j + k] = (value >> (k << 3)) & 0xff; 1171 } 1172 } 1173 1174 return size; 1175 } 1176 1177 static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout) 1178 { 1179 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER); 1180 1181 timeout = jiffies + msecs_to_jiffies(timeout); 1182 1183 while (time_before(jiffies, timeout)) { 1184 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER); 1185 if ((value & DSI_TRIGGER_HOST) == 0) 1186 return 0; 1187 1188 usleep_range(1000, 2000); 1189 } 1190 1191 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n"); 1192 return -ETIMEDOUT; 1193 } 1194 1195 static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi, 1196 unsigned long timeout) 1197 { 1198 timeout = jiffies + msecs_to_jiffies(250); 1199 1200 while (time_before(jiffies, timeout)) { 1201 u32 value = tegra_dsi_readl(dsi, DSI_STATUS); 1202 u8 count = value & 0x1f; 1203 1204 if (count > 0) 1205 return count; 1206 1207 usleep_range(1000, 2000); 1208 } 1209 1210 DRM_DEBUG_KMS("peripheral returned no data\n"); 1211 return -ETIMEDOUT; 1212 } 1213 1214 static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset, 1215 const void *buffer, size_t size) 1216 { 1217 const u8 *buf = buffer; 1218 size_t i, j; 1219 u32 value; 1220 1221 for (j = 0; j < size; j += 4) { 1222 value = 0; 1223 1224 for (i = 0; i < 4 && j + i < size; i++) 1225 value |= buf[j + i] << (i << 3); 1226 1227 tegra_dsi_writel(dsi, value, DSI_WR_DATA); 1228 } 1229 } 1230 1231 static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host, 1232 const struct mipi_dsi_msg *msg) 1233 { 1234 struct tegra_dsi *dsi = host_to_tegra(host); 1235 struct mipi_dsi_packet packet; 1236 const u8 *header; 1237 size_t count; 1238 ssize_t err; 1239 u32 value; 1240 1241 err = mipi_dsi_create_packet(&packet, msg); 1242 if (err < 0) 1243 return err; 1244 1245 header = packet.header; 1246 1247 /* maximum FIFO depth is 1920 words */ 1248 if (packet.size > dsi->video_fifo_depth * 4) 1249 return -ENOSPC; 1250 1251 /* reset underflow/overflow flags */ 1252 value = tegra_dsi_readl(dsi, DSI_STATUS); 1253 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) { 1254 value = DSI_HOST_CONTROL_FIFO_RESET; 1255 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 1256 usleep_range(10, 20); 1257 } 1258 1259 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 1260 value |= DSI_POWER_CONTROL_ENABLE; 1261 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 1262 1263 usleep_range(5000, 10000); 1264 1265 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST | 1266 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC; 1267 1268 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0) 1269 value |= DSI_HOST_CONTROL_HS; 1270 1271 /* 1272 * The host FIFO has a maximum of 64 words, so larger transmissions 1273 * need to use the video FIFO. 1274 */ 1275 if (packet.size > dsi->host_fifo_depth * 4) 1276 value |= DSI_HOST_CONTROL_FIFO_SEL; 1277 1278 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 1279 1280 /* 1281 * For reads and messages with explicitly requested ACK, generate a 1282 * BTA sequence after the transmission of the packet. 1283 */ 1284 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) || 1285 (msg->rx_buf && msg->rx_len > 0)) { 1286 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL); 1287 value |= DSI_HOST_CONTROL_PKT_BTA; 1288 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 1289 } 1290 1291 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE; 1292 tegra_dsi_writel(dsi, value, DSI_CONTROL); 1293 1294 /* write packet header, ECC is generated by hardware */ 1295 value = header[2] << 16 | header[1] << 8 | header[0]; 1296 tegra_dsi_writel(dsi, value, DSI_WR_DATA); 1297 1298 /* write payload (if any) */ 1299 if (packet.payload_length > 0) 1300 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload, 1301 packet.payload_length); 1302 1303 err = tegra_dsi_transmit(dsi, 250); 1304 if (err < 0) 1305 return err; 1306 1307 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) || 1308 (msg->rx_buf && msg->rx_len > 0)) { 1309 err = tegra_dsi_wait_for_response(dsi, 250); 1310 if (err < 0) 1311 return err; 1312 1313 count = err; 1314 1315 value = tegra_dsi_readl(dsi, DSI_RD_DATA); 1316 switch (value) { 1317 case 0x84: 1318 /* 1319 dev_dbg(dsi->dev, "ACK\n"); 1320 */ 1321 break; 1322 1323 case 0x87: 1324 /* 1325 dev_dbg(dsi->dev, "ESCAPE\n"); 1326 */ 1327 break; 1328 1329 default: 1330 dev_err(dsi->dev, "unknown status: %08x\n", value); 1331 break; 1332 } 1333 1334 if (count > 1) { 1335 err = tegra_dsi_read_response(dsi, msg, count); 1336 if (err < 0) 1337 dev_err(dsi->dev, 1338 "failed to parse response: %zd\n", 1339 err); 1340 else { 1341 /* 1342 * For read commands, return the number of 1343 * bytes returned by the peripheral. 1344 */ 1345 count = err; 1346 } 1347 } 1348 } else { 1349 /* 1350 * For write commands, we have transmitted the 4-byte header 1351 * plus the variable-length payload. 1352 */ 1353 count = 4 + packet.payload_length; 1354 } 1355 1356 return count; 1357 } 1358 1359 static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi) 1360 { 1361 struct clk *parent; 1362 int err; 1363 1364 /* make sure both DSI controllers share the same PLL */ 1365 parent = clk_get_parent(dsi->slave->clk); 1366 if (!parent) 1367 return -EINVAL; 1368 1369 err = clk_set_parent(parent, dsi->clk_parent); 1370 if (err < 0) 1371 return err; 1372 1373 return 0; 1374 } 1375 1376 static int tegra_dsi_host_attach(struct mipi_dsi_host *host, 1377 struct mipi_dsi_device *device) 1378 { 1379 struct tegra_dsi *dsi = host_to_tegra(host); 1380 1381 dsi->flags = device->mode_flags; 1382 dsi->format = device->format; 1383 dsi->lanes = device->lanes; 1384 1385 if (dsi->slave) { 1386 int err; 1387 1388 dev_dbg(dsi->dev, "attaching dual-channel device %s\n", 1389 dev_name(&device->dev)); 1390 1391 err = tegra_dsi_ganged_setup(dsi); 1392 if (err < 0) { 1393 dev_err(dsi->dev, "failed to set up ganged mode: %d\n", 1394 err); 1395 return err; 1396 } 1397 } 1398 1399 /* 1400 * Slaves don't have a panel associated with them, so they provide 1401 * merely the second channel. 1402 */ 1403 if (!dsi->master) { 1404 struct tegra_output *output = &dsi->output; 1405 1406 output->panel = of_drm_find_panel(device->dev.of_node); 1407 if (output->panel && output->connector.dev) { 1408 drm_panel_attach(output->panel, &output->connector); 1409 drm_helper_hpd_irq_event(output->connector.dev); 1410 } 1411 } 1412 1413 return 0; 1414 } 1415 1416 static int tegra_dsi_host_detach(struct mipi_dsi_host *host, 1417 struct mipi_dsi_device *device) 1418 { 1419 struct tegra_dsi *dsi = host_to_tegra(host); 1420 struct tegra_output *output = &dsi->output; 1421 1422 if (output->panel && &device->dev == output->panel->dev) { 1423 output->panel = NULL; 1424 1425 if (output->connector.dev) 1426 drm_helper_hpd_irq_event(output->connector.dev); 1427 } 1428 1429 return 0; 1430 } 1431 1432 static const struct mipi_dsi_host_ops tegra_dsi_host_ops = { 1433 .attach = tegra_dsi_host_attach, 1434 .detach = tegra_dsi_host_detach, 1435 .transfer = tegra_dsi_host_transfer, 1436 }; 1437 1438 static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi) 1439 { 1440 struct device_node *np; 1441 1442 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0); 1443 if (np) { 1444 struct platform_device *gangster = of_find_device_by_node(np); 1445 1446 dsi->slave = platform_get_drvdata(gangster); 1447 of_node_put(np); 1448 1449 if (!dsi->slave) 1450 return -EPROBE_DEFER; 1451 1452 dsi->slave->master = dsi; 1453 } 1454 1455 return 0; 1456 } 1457 1458 static int tegra_dsi_probe(struct platform_device *pdev) 1459 { 1460 struct tegra_dsi *dsi; 1461 struct resource *regs; 1462 int err; 1463 1464 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL); 1465 if (!dsi) 1466 return -ENOMEM; 1467 1468 dsi->output.dev = dsi->dev = &pdev->dev; 1469 dsi->video_fifo_depth = 1920; 1470 dsi->host_fifo_depth = 64; 1471 1472 err = tegra_dsi_ganged_probe(dsi); 1473 if (err < 0) 1474 return err; 1475 1476 err = tegra_output_probe(&dsi->output); 1477 if (err < 0) 1478 return err; 1479 1480 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD; 1481 1482 /* 1483 * Assume these values by default. When a DSI peripheral driver 1484 * attaches to the DSI host, the parameters will be taken from 1485 * the attached device. 1486 */ 1487 dsi->flags = MIPI_DSI_MODE_VIDEO; 1488 dsi->format = MIPI_DSI_FMT_RGB888; 1489 dsi->lanes = 4; 1490 1491 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi"); 1492 if (IS_ERR(dsi->rst)) 1493 return PTR_ERR(dsi->rst); 1494 1495 dsi->clk = devm_clk_get(&pdev->dev, NULL); 1496 if (IS_ERR(dsi->clk)) { 1497 dev_err(&pdev->dev, "cannot get DSI clock\n"); 1498 err = PTR_ERR(dsi->clk); 1499 goto reset; 1500 } 1501 1502 err = clk_prepare_enable(dsi->clk); 1503 if (err < 0) { 1504 dev_err(&pdev->dev, "cannot enable DSI clock\n"); 1505 goto reset; 1506 } 1507 1508 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp"); 1509 if (IS_ERR(dsi->clk_lp)) { 1510 dev_err(&pdev->dev, "cannot get low-power clock\n"); 1511 err = PTR_ERR(dsi->clk_lp); 1512 goto disable_clk; 1513 } 1514 1515 err = clk_prepare_enable(dsi->clk_lp); 1516 if (err < 0) { 1517 dev_err(&pdev->dev, "cannot enable low-power clock\n"); 1518 goto disable_clk; 1519 } 1520 1521 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent"); 1522 if (IS_ERR(dsi->clk_parent)) { 1523 dev_err(&pdev->dev, "cannot get parent clock\n"); 1524 err = PTR_ERR(dsi->clk_parent); 1525 goto disable_clk_lp; 1526 } 1527 1528 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi"); 1529 if (IS_ERR(dsi->vdd)) { 1530 dev_err(&pdev->dev, "cannot get VDD supply\n"); 1531 err = PTR_ERR(dsi->vdd); 1532 goto disable_clk_lp; 1533 } 1534 1535 err = regulator_enable(dsi->vdd); 1536 if (err < 0) { 1537 dev_err(&pdev->dev, "cannot enable VDD supply\n"); 1538 goto disable_clk_lp; 1539 } 1540 1541 err = tegra_dsi_setup_clocks(dsi); 1542 if (err < 0) { 1543 dev_err(&pdev->dev, "cannot setup clocks\n"); 1544 goto disable_vdd; 1545 } 1546 1547 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1548 dsi->regs = devm_ioremap_resource(&pdev->dev, regs); 1549 if (IS_ERR(dsi->regs)) { 1550 err = PTR_ERR(dsi->regs); 1551 goto disable_vdd; 1552 } 1553 1554 dsi->mipi = tegra_mipi_request(&pdev->dev); 1555 if (IS_ERR(dsi->mipi)) { 1556 err = PTR_ERR(dsi->mipi); 1557 goto disable_vdd; 1558 } 1559 1560 dsi->host.ops = &tegra_dsi_host_ops; 1561 dsi->host.dev = &pdev->dev; 1562 1563 err = mipi_dsi_host_register(&dsi->host); 1564 if (err < 0) { 1565 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err); 1566 goto mipi_free; 1567 } 1568 1569 INIT_LIST_HEAD(&dsi->client.list); 1570 dsi->client.ops = &dsi_client_ops; 1571 dsi->client.dev = &pdev->dev; 1572 1573 err = host1x_client_register(&dsi->client); 1574 if (err < 0) { 1575 dev_err(&pdev->dev, "failed to register host1x client: %d\n", 1576 err); 1577 goto unregister; 1578 } 1579 1580 platform_set_drvdata(pdev, dsi); 1581 1582 return 0; 1583 1584 unregister: 1585 mipi_dsi_host_unregister(&dsi->host); 1586 mipi_free: 1587 tegra_mipi_free(dsi->mipi); 1588 disable_vdd: 1589 regulator_disable(dsi->vdd); 1590 disable_clk_lp: 1591 clk_disable_unprepare(dsi->clk_lp); 1592 disable_clk: 1593 clk_disable_unprepare(dsi->clk); 1594 reset: 1595 reset_control_assert(dsi->rst); 1596 return err; 1597 } 1598 1599 static int tegra_dsi_remove(struct platform_device *pdev) 1600 { 1601 struct tegra_dsi *dsi = platform_get_drvdata(pdev); 1602 int err; 1603 1604 err = host1x_client_unregister(&dsi->client); 1605 if (err < 0) { 1606 dev_err(&pdev->dev, "failed to unregister host1x client: %d\n", 1607 err); 1608 return err; 1609 } 1610 1611 tegra_output_remove(&dsi->output); 1612 1613 mipi_dsi_host_unregister(&dsi->host); 1614 tegra_mipi_free(dsi->mipi); 1615 1616 regulator_disable(dsi->vdd); 1617 clk_disable_unprepare(dsi->clk_lp); 1618 clk_disable_unprepare(dsi->clk); 1619 reset_control_assert(dsi->rst); 1620 1621 return 0; 1622 } 1623 1624 static const struct of_device_id tegra_dsi_of_match[] = { 1625 { .compatible = "nvidia,tegra210-dsi", }, 1626 { .compatible = "nvidia,tegra132-dsi", }, 1627 { .compatible = "nvidia,tegra124-dsi", }, 1628 { .compatible = "nvidia,tegra114-dsi", }, 1629 { }, 1630 }; 1631 MODULE_DEVICE_TABLE(of, tegra_dsi_of_match); 1632 1633 struct platform_driver tegra_dsi_driver = { 1634 .driver = { 1635 .name = "tegra-dsi", 1636 .of_match_table = tegra_dsi_of_match, 1637 }, 1638 .probe = tegra_dsi_probe, 1639 .remove = tegra_dsi_remove, 1640 }; 1641