1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 NVIDIA Corporation 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/debugfs.h> 8 #include <linux/delay.h> 9 #include <linux/host1x.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/of_platform.h> 13 #include <linux/platform_device.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/regulator/consumer.h> 16 #include <linux/reset.h> 17 18 #include <video/mipi_display.h> 19 20 #include <drm/drm_atomic_helper.h> 21 #include <drm/drm_debugfs.h> 22 #include <drm/drm_file.h> 23 #include <drm/drm_mipi_dsi.h> 24 #include <drm/drm_panel.h> 25 #include <drm/drm_simple_kms_helper.h> 26 27 #include "dc.h" 28 #include "drm.h" 29 #include "dsi.h" 30 #include "mipi-phy.h" 31 #include "trace.h" 32 33 struct tegra_dsi_state { 34 struct drm_connector_state base; 35 36 struct mipi_dphy_timing timing; 37 unsigned long period; 38 39 unsigned int vrefresh; 40 unsigned int lanes; 41 unsigned long pclk; 42 unsigned long bclk; 43 44 enum tegra_dsi_format format; 45 unsigned int mul; 46 unsigned int div; 47 }; 48 49 static inline struct tegra_dsi_state * 50 to_dsi_state(struct drm_connector_state *state) 51 { 52 return container_of(state, struct tegra_dsi_state, base); 53 } 54 55 struct tegra_dsi { 56 struct host1x_client client; 57 struct tegra_output output; 58 struct device *dev; 59 60 void __iomem *regs; 61 62 struct reset_control *rst; 63 struct clk *clk_parent; 64 struct clk *clk_lp; 65 struct clk *clk; 66 67 struct drm_info_list *debugfs_files; 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 int offset) 108 { 109 u32 value = readl(dsi->regs + (offset << 2)); 110 111 trace_dsi_readl(dsi->dev, offset, value); 112 113 return value; 114 } 115 116 static inline void tegra_dsi_writel(struct tegra_dsi *dsi, u32 value, 117 unsigned int offset) 118 { 119 trace_dsi_writel(dsi->dev, offset, value); 120 writel(value, dsi->regs + (offset << 2)); 121 } 122 123 #define DEBUGFS_REG32(_name) { .name = #_name, .offset = _name } 124 125 static const struct debugfs_reg32 tegra_dsi_regs[] = { 126 DEBUGFS_REG32(DSI_INCR_SYNCPT), 127 DEBUGFS_REG32(DSI_INCR_SYNCPT_CONTROL), 128 DEBUGFS_REG32(DSI_INCR_SYNCPT_ERROR), 129 DEBUGFS_REG32(DSI_CTXSW), 130 DEBUGFS_REG32(DSI_RD_DATA), 131 DEBUGFS_REG32(DSI_WR_DATA), 132 DEBUGFS_REG32(DSI_POWER_CONTROL), 133 DEBUGFS_REG32(DSI_INT_ENABLE), 134 DEBUGFS_REG32(DSI_INT_STATUS), 135 DEBUGFS_REG32(DSI_INT_MASK), 136 DEBUGFS_REG32(DSI_HOST_CONTROL), 137 DEBUGFS_REG32(DSI_CONTROL), 138 DEBUGFS_REG32(DSI_SOL_DELAY), 139 DEBUGFS_REG32(DSI_MAX_THRESHOLD), 140 DEBUGFS_REG32(DSI_TRIGGER), 141 DEBUGFS_REG32(DSI_TX_CRC), 142 DEBUGFS_REG32(DSI_STATUS), 143 DEBUGFS_REG32(DSI_INIT_SEQ_CONTROL), 144 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_0), 145 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_1), 146 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_2), 147 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_3), 148 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_4), 149 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_5), 150 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_6), 151 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_7), 152 DEBUGFS_REG32(DSI_PKT_SEQ_0_LO), 153 DEBUGFS_REG32(DSI_PKT_SEQ_0_HI), 154 DEBUGFS_REG32(DSI_PKT_SEQ_1_LO), 155 DEBUGFS_REG32(DSI_PKT_SEQ_1_HI), 156 DEBUGFS_REG32(DSI_PKT_SEQ_2_LO), 157 DEBUGFS_REG32(DSI_PKT_SEQ_2_HI), 158 DEBUGFS_REG32(DSI_PKT_SEQ_3_LO), 159 DEBUGFS_REG32(DSI_PKT_SEQ_3_HI), 160 DEBUGFS_REG32(DSI_PKT_SEQ_4_LO), 161 DEBUGFS_REG32(DSI_PKT_SEQ_4_HI), 162 DEBUGFS_REG32(DSI_PKT_SEQ_5_LO), 163 DEBUGFS_REG32(DSI_PKT_SEQ_5_HI), 164 DEBUGFS_REG32(DSI_DCS_CMDS), 165 DEBUGFS_REG32(DSI_PKT_LEN_0_1), 166 DEBUGFS_REG32(DSI_PKT_LEN_2_3), 167 DEBUGFS_REG32(DSI_PKT_LEN_4_5), 168 DEBUGFS_REG32(DSI_PKT_LEN_6_7), 169 DEBUGFS_REG32(DSI_PHY_TIMING_0), 170 DEBUGFS_REG32(DSI_PHY_TIMING_1), 171 DEBUGFS_REG32(DSI_PHY_TIMING_2), 172 DEBUGFS_REG32(DSI_BTA_TIMING), 173 DEBUGFS_REG32(DSI_TIMEOUT_0), 174 DEBUGFS_REG32(DSI_TIMEOUT_1), 175 DEBUGFS_REG32(DSI_TO_TALLY), 176 DEBUGFS_REG32(DSI_PAD_CONTROL_0), 177 DEBUGFS_REG32(DSI_PAD_CONTROL_CD), 178 DEBUGFS_REG32(DSI_PAD_CD_STATUS), 179 DEBUGFS_REG32(DSI_VIDEO_MODE_CONTROL), 180 DEBUGFS_REG32(DSI_PAD_CONTROL_1), 181 DEBUGFS_REG32(DSI_PAD_CONTROL_2), 182 DEBUGFS_REG32(DSI_PAD_CONTROL_3), 183 DEBUGFS_REG32(DSI_PAD_CONTROL_4), 184 DEBUGFS_REG32(DSI_GANGED_MODE_CONTROL), 185 DEBUGFS_REG32(DSI_GANGED_MODE_START), 186 DEBUGFS_REG32(DSI_GANGED_MODE_SIZE), 187 DEBUGFS_REG32(DSI_RAW_DATA_BYTE_COUNT), 188 DEBUGFS_REG32(DSI_ULTRA_LOW_POWER_CONTROL), 189 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_8), 190 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_9), 191 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_10), 192 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_11), 193 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_12), 194 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_13), 195 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_14), 196 DEBUGFS_REG32(DSI_INIT_SEQ_DATA_15), 197 }; 198 199 static int tegra_dsi_show_regs(struct seq_file *s, void *data) 200 { 201 struct drm_info_node *node = s->private; 202 struct tegra_dsi *dsi = node->info_ent->data; 203 struct drm_crtc *crtc = dsi->output.encoder.crtc; 204 struct drm_device *drm = node->minor->dev; 205 unsigned int i; 206 int err = 0; 207 208 drm_modeset_lock_all(drm); 209 210 if (!crtc || !crtc->state->active) { 211 err = -EBUSY; 212 goto unlock; 213 } 214 215 for (i = 0; i < ARRAY_SIZE(tegra_dsi_regs); i++) { 216 unsigned int offset = tegra_dsi_regs[i].offset; 217 218 seq_printf(s, "%-32s %#05x %08x\n", tegra_dsi_regs[i].name, 219 offset, tegra_dsi_readl(dsi, offset)); 220 } 221 222 unlock: 223 drm_modeset_unlock_all(drm); 224 return err; 225 } 226 227 static struct drm_info_list debugfs_files[] = { 228 { "regs", tegra_dsi_show_regs, 0, NULL }, 229 }; 230 231 static int tegra_dsi_late_register(struct drm_connector *connector) 232 { 233 struct tegra_output *output = connector_to_output(connector); 234 unsigned int i, count = ARRAY_SIZE(debugfs_files); 235 struct drm_minor *minor = connector->dev->primary; 236 struct dentry *root = connector->debugfs_entry; 237 struct tegra_dsi *dsi = to_dsi(output); 238 239 dsi->debugfs_files = kmemdup(debugfs_files, sizeof(debugfs_files), 240 GFP_KERNEL); 241 if (!dsi->debugfs_files) 242 return -ENOMEM; 243 244 for (i = 0; i < count; i++) 245 dsi->debugfs_files[i].data = dsi; 246 247 drm_debugfs_create_files(dsi->debugfs_files, count, root, minor); 248 249 return 0; 250 } 251 252 static void tegra_dsi_early_unregister(struct drm_connector *connector) 253 { 254 struct tegra_output *output = connector_to_output(connector); 255 unsigned int count = ARRAY_SIZE(debugfs_files); 256 struct tegra_dsi *dsi = to_dsi(output); 257 258 drm_debugfs_remove_files(dsi->debugfs_files, count, 259 connector->debugfs_entry, 260 connector->dev->primary); 261 kfree(dsi->debugfs_files); 262 dsi->debugfs_files = NULL; 263 } 264 265 #define PKT_ID0(id) ((((id) & 0x3f) << 3) | (1 << 9)) 266 #define PKT_LEN0(len) (((len) & 0x07) << 0) 267 #define PKT_ID1(id) ((((id) & 0x3f) << 13) | (1 << 19)) 268 #define PKT_LEN1(len) (((len) & 0x07) << 10) 269 #define PKT_ID2(id) ((((id) & 0x3f) << 23) | (1 << 29)) 270 #define PKT_LEN2(len) (((len) & 0x07) << 20) 271 272 #define PKT_LP (1 << 30) 273 #define NUM_PKT_SEQ 12 274 275 /* 276 * non-burst mode with sync pulses 277 */ 278 static const u32 pkt_seq_video_non_burst_sync_pulses[NUM_PKT_SEQ] = { 279 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) | 280 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 281 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 282 PKT_LP, 283 [ 1] = 0, 284 [ 2] = PKT_ID0(MIPI_DSI_V_SYNC_END) | PKT_LEN0(0) | 285 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 286 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 287 PKT_LP, 288 [ 3] = 0, 289 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 290 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 291 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 292 PKT_LP, 293 [ 5] = 0, 294 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 295 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 296 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0), 297 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) | 298 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) | 299 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4), 300 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 301 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 302 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0) | 303 PKT_LP, 304 [ 9] = 0, 305 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 306 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(1) | 307 PKT_ID2(MIPI_DSI_H_SYNC_END) | PKT_LEN2(0), 308 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(2) | 309 PKT_ID1(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN1(3) | 310 PKT_ID2(MIPI_DSI_BLANKING_PACKET) | PKT_LEN2(4), 311 }; 312 313 /* 314 * non-burst mode with sync events 315 */ 316 static const u32 pkt_seq_video_non_burst_sync_events[NUM_PKT_SEQ] = { 317 [ 0] = PKT_ID0(MIPI_DSI_V_SYNC_START) | PKT_LEN0(0) | 318 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 319 PKT_LP, 320 [ 1] = 0, 321 [ 2] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 322 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 323 PKT_LP, 324 [ 3] = 0, 325 [ 4] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 326 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 327 PKT_LP, 328 [ 5] = 0, 329 [ 6] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 330 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) | 331 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3), 332 [ 7] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4), 333 [ 8] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 334 PKT_ID1(MIPI_DSI_END_OF_TRANSMISSION) | PKT_LEN1(7) | 335 PKT_LP, 336 [ 9] = 0, 337 [10] = PKT_ID0(MIPI_DSI_H_SYNC_START) | PKT_LEN0(0) | 338 PKT_ID1(MIPI_DSI_BLANKING_PACKET) | PKT_LEN1(2) | 339 PKT_ID2(MIPI_DSI_PACKED_PIXEL_STREAM_24) | PKT_LEN2(3), 340 [11] = PKT_ID0(MIPI_DSI_BLANKING_PACKET) | PKT_LEN0(4), 341 }; 342 343 static const u32 pkt_seq_command_mode[NUM_PKT_SEQ] = { 344 [ 0] = 0, 345 [ 1] = 0, 346 [ 2] = 0, 347 [ 3] = 0, 348 [ 4] = 0, 349 [ 5] = 0, 350 [ 6] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(3) | PKT_LP, 351 [ 7] = 0, 352 [ 8] = 0, 353 [ 9] = 0, 354 [10] = PKT_ID0(MIPI_DSI_DCS_LONG_WRITE) | PKT_LEN0(5) | PKT_LP, 355 [11] = 0, 356 }; 357 358 static void tegra_dsi_set_phy_timing(struct tegra_dsi *dsi, 359 unsigned long period, 360 const struct mipi_dphy_timing *timing) 361 { 362 u32 value; 363 364 value = DSI_TIMING_FIELD(timing->hsexit, period, 1) << 24 | 365 DSI_TIMING_FIELD(timing->hstrail, period, 0) << 16 | 366 DSI_TIMING_FIELD(timing->hszero, period, 3) << 8 | 367 DSI_TIMING_FIELD(timing->hsprepare, period, 1); 368 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_0); 369 370 value = DSI_TIMING_FIELD(timing->clktrail, period, 1) << 24 | 371 DSI_TIMING_FIELD(timing->clkpost, period, 1) << 16 | 372 DSI_TIMING_FIELD(timing->clkzero, period, 1) << 8 | 373 DSI_TIMING_FIELD(timing->lpx, period, 1); 374 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_1); 375 376 value = DSI_TIMING_FIELD(timing->clkprepare, period, 1) << 16 | 377 DSI_TIMING_FIELD(timing->clkpre, period, 1) << 8 | 378 DSI_TIMING_FIELD(0xff * period, period, 0) << 0; 379 tegra_dsi_writel(dsi, value, DSI_PHY_TIMING_2); 380 381 value = DSI_TIMING_FIELD(timing->taget, period, 1) << 16 | 382 DSI_TIMING_FIELD(timing->tasure, period, 1) << 8 | 383 DSI_TIMING_FIELD(timing->tago, period, 1); 384 tegra_dsi_writel(dsi, value, DSI_BTA_TIMING); 385 386 if (dsi->slave) 387 tegra_dsi_set_phy_timing(dsi->slave, period, timing); 388 } 389 390 static int tegra_dsi_get_muldiv(enum mipi_dsi_pixel_format format, 391 unsigned int *mulp, unsigned int *divp) 392 { 393 switch (format) { 394 case MIPI_DSI_FMT_RGB666_PACKED: 395 case MIPI_DSI_FMT_RGB888: 396 *mulp = 3; 397 *divp = 1; 398 break; 399 400 case MIPI_DSI_FMT_RGB565: 401 *mulp = 2; 402 *divp = 1; 403 break; 404 405 case MIPI_DSI_FMT_RGB666: 406 *mulp = 9; 407 *divp = 4; 408 break; 409 410 default: 411 return -EINVAL; 412 } 413 414 return 0; 415 } 416 417 static int tegra_dsi_get_format(enum mipi_dsi_pixel_format format, 418 enum tegra_dsi_format *fmt) 419 { 420 switch (format) { 421 case MIPI_DSI_FMT_RGB888: 422 *fmt = TEGRA_DSI_FORMAT_24P; 423 break; 424 425 case MIPI_DSI_FMT_RGB666: 426 *fmt = TEGRA_DSI_FORMAT_18NP; 427 break; 428 429 case MIPI_DSI_FMT_RGB666_PACKED: 430 *fmt = TEGRA_DSI_FORMAT_18P; 431 break; 432 433 case MIPI_DSI_FMT_RGB565: 434 *fmt = TEGRA_DSI_FORMAT_16P; 435 break; 436 437 default: 438 return -EINVAL; 439 } 440 441 return 0; 442 } 443 444 static void tegra_dsi_ganged_enable(struct tegra_dsi *dsi, unsigned int start, 445 unsigned int size) 446 { 447 u32 value; 448 449 tegra_dsi_writel(dsi, start, DSI_GANGED_MODE_START); 450 tegra_dsi_writel(dsi, size << 16 | size, DSI_GANGED_MODE_SIZE); 451 452 value = DSI_GANGED_MODE_CONTROL_ENABLE; 453 tegra_dsi_writel(dsi, value, DSI_GANGED_MODE_CONTROL); 454 } 455 456 static void tegra_dsi_enable(struct tegra_dsi *dsi) 457 { 458 u32 value; 459 460 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 461 value |= DSI_POWER_CONTROL_ENABLE; 462 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 463 464 if (dsi->slave) 465 tegra_dsi_enable(dsi->slave); 466 } 467 468 static unsigned int tegra_dsi_get_lanes(struct tegra_dsi *dsi) 469 { 470 if (dsi->master) 471 return dsi->master->lanes + dsi->lanes; 472 473 if (dsi->slave) 474 return dsi->lanes + dsi->slave->lanes; 475 476 return dsi->lanes; 477 } 478 479 static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe, 480 const struct drm_display_mode *mode) 481 { 482 unsigned int hact, hsw, hbp, hfp, i, mul, div; 483 struct tegra_dsi_state *state; 484 const u32 *pkt_seq; 485 u32 value; 486 487 /* XXX: pass in state into this function? */ 488 if (dsi->master) 489 state = tegra_dsi_get_state(dsi->master); 490 else 491 state = tegra_dsi_get_state(dsi); 492 493 mul = state->mul; 494 div = state->div; 495 496 if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) { 497 DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n"); 498 pkt_seq = pkt_seq_video_non_burst_sync_pulses; 499 } else if (dsi->flags & MIPI_DSI_MODE_VIDEO) { 500 DRM_DEBUG_KMS("Non-burst video mode with sync events\n"); 501 pkt_seq = pkt_seq_video_non_burst_sync_events; 502 } else { 503 DRM_DEBUG_KMS("Command mode\n"); 504 pkt_seq = pkt_seq_command_mode; 505 } 506 507 value = DSI_CONTROL_CHANNEL(0) | 508 DSI_CONTROL_FORMAT(state->format) | 509 DSI_CONTROL_LANES(dsi->lanes - 1) | 510 DSI_CONTROL_SOURCE(pipe); 511 tegra_dsi_writel(dsi, value, DSI_CONTROL); 512 513 tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD); 514 515 value = DSI_HOST_CONTROL_HS; 516 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 517 518 value = tegra_dsi_readl(dsi, DSI_CONTROL); 519 520 if (dsi->flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) 521 value |= DSI_CONTROL_HS_CLK_CTRL; 522 523 value &= ~DSI_CONTROL_TX_TRIG(3); 524 525 /* enable DCS commands for command mode */ 526 if (dsi->flags & MIPI_DSI_MODE_VIDEO) 527 value &= ~DSI_CONTROL_DCS_ENABLE; 528 else 529 value |= DSI_CONTROL_DCS_ENABLE; 530 531 value |= DSI_CONTROL_VIDEO_ENABLE; 532 value &= ~DSI_CONTROL_HOST_ENABLE; 533 tegra_dsi_writel(dsi, value, DSI_CONTROL); 534 535 for (i = 0; i < NUM_PKT_SEQ; i++) 536 tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i); 537 538 if (dsi->flags & MIPI_DSI_MODE_VIDEO) { 539 /* horizontal active pixels */ 540 hact = mode->hdisplay * mul / div; 541 542 /* horizontal sync width */ 543 hsw = (mode->hsync_end - mode->hsync_start) * mul / div; 544 545 /* horizontal back porch */ 546 hbp = (mode->htotal - mode->hsync_end) * mul / div; 547 548 if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0) 549 hbp += hsw; 550 551 /* horizontal front porch */ 552 hfp = (mode->hsync_start - mode->hdisplay) * mul / div; 553 554 /* subtract packet overhead */ 555 hsw -= 10; 556 hbp -= 14; 557 hfp -= 8; 558 559 tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1); 560 tegra_dsi_writel(dsi, hact << 16 | hbp, DSI_PKT_LEN_2_3); 561 tegra_dsi_writel(dsi, hfp, DSI_PKT_LEN_4_5); 562 tegra_dsi_writel(dsi, 0x0f0f << 16, DSI_PKT_LEN_6_7); 563 564 /* set SOL delay (for non-burst mode only) */ 565 tegra_dsi_writel(dsi, 8 * mul / div, DSI_SOL_DELAY); 566 567 /* TODO: implement ganged mode */ 568 } else { 569 u16 bytes; 570 571 if (dsi->master || dsi->slave) { 572 /* 573 * For ganged mode, assume symmetric left-right mode. 574 */ 575 bytes = 1 + (mode->hdisplay / 2) * mul / div; 576 } else { 577 /* 1 byte (DCS command) + pixel data */ 578 bytes = 1 + mode->hdisplay * mul / div; 579 } 580 581 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_0_1); 582 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_2_3); 583 tegra_dsi_writel(dsi, bytes << 16, DSI_PKT_LEN_4_5); 584 tegra_dsi_writel(dsi, 0, DSI_PKT_LEN_6_7); 585 586 value = MIPI_DCS_WRITE_MEMORY_START << 8 | 587 MIPI_DCS_WRITE_MEMORY_CONTINUE; 588 tegra_dsi_writel(dsi, value, DSI_DCS_CMDS); 589 590 /* set SOL delay */ 591 if (dsi->master || dsi->slave) { 592 unsigned long delay, bclk, bclk_ganged; 593 unsigned int lanes = state->lanes; 594 595 /* SOL to valid, valid to FIFO and FIFO write delay */ 596 delay = 4 + 4 + 2; 597 delay = DIV_ROUND_UP(delay * mul, div * lanes); 598 /* FIFO read delay */ 599 delay = delay + 6; 600 601 bclk = DIV_ROUND_UP(mode->htotal * mul, div * lanes); 602 bclk_ganged = DIV_ROUND_UP(bclk * lanes / 2, lanes); 603 value = bclk - bclk_ganged + delay + 20; 604 } else { 605 /* TODO: revisit for non-ganged mode */ 606 value = 8 * mul / div; 607 } 608 609 tegra_dsi_writel(dsi, value, DSI_SOL_DELAY); 610 } 611 612 if (dsi->slave) { 613 tegra_dsi_configure(dsi->slave, pipe, mode); 614 615 /* 616 * TODO: Support modes other than symmetrical left-right 617 * split. 618 */ 619 tegra_dsi_ganged_enable(dsi, 0, mode->hdisplay / 2); 620 tegra_dsi_ganged_enable(dsi->slave, mode->hdisplay / 2, 621 mode->hdisplay / 2); 622 } 623 } 624 625 static int tegra_dsi_wait_idle(struct tegra_dsi *dsi, unsigned long timeout) 626 { 627 u32 value; 628 629 timeout = jiffies + msecs_to_jiffies(timeout); 630 631 while (time_before(jiffies, timeout)) { 632 value = tegra_dsi_readl(dsi, DSI_STATUS); 633 if (value & DSI_STATUS_IDLE) 634 return 0; 635 636 usleep_range(1000, 2000); 637 } 638 639 return -ETIMEDOUT; 640 } 641 642 static void tegra_dsi_video_disable(struct tegra_dsi *dsi) 643 { 644 u32 value; 645 646 value = tegra_dsi_readl(dsi, DSI_CONTROL); 647 value &= ~DSI_CONTROL_VIDEO_ENABLE; 648 tegra_dsi_writel(dsi, value, DSI_CONTROL); 649 650 if (dsi->slave) 651 tegra_dsi_video_disable(dsi->slave); 652 } 653 654 static void tegra_dsi_ganged_disable(struct tegra_dsi *dsi) 655 { 656 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_START); 657 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_SIZE); 658 tegra_dsi_writel(dsi, 0, DSI_GANGED_MODE_CONTROL); 659 } 660 661 static int tegra_dsi_pad_enable(struct tegra_dsi *dsi) 662 { 663 u32 value; 664 665 value = DSI_PAD_CONTROL_VS1_PULLDN(0) | DSI_PAD_CONTROL_VS1_PDIO(0); 666 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_0); 667 668 return 0; 669 } 670 671 static int tegra_dsi_pad_calibrate(struct tegra_dsi *dsi) 672 { 673 u32 value; 674 int err; 675 676 /* 677 * XXX Is this still needed? The module reset is deasserted right 678 * before this function is called. 679 */ 680 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_0); 681 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_1); 682 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_2); 683 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_3); 684 tegra_dsi_writel(dsi, 0, DSI_PAD_CONTROL_4); 685 686 /* start calibration */ 687 tegra_dsi_pad_enable(dsi); 688 689 value = DSI_PAD_SLEW_UP(0x7) | DSI_PAD_SLEW_DN(0x7) | 690 DSI_PAD_LP_UP(0x1) | DSI_PAD_LP_DN(0x1) | 691 DSI_PAD_OUT_CLK(0x0); 692 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_2); 693 694 value = DSI_PAD_PREEMP_PD_CLK(0x3) | DSI_PAD_PREEMP_PU_CLK(0x3) | 695 DSI_PAD_PREEMP_PD(0x03) | DSI_PAD_PREEMP_PU(0x3); 696 tegra_dsi_writel(dsi, value, DSI_PAD_CONTROL_3); 697 698 err = tegra_mipi_start_calibration(dsi->mipi); 699 if (err < 0) 700 return err; 701 702 return tegra_mipi_finish_calibration(dsi->mipi); 703 } 704 705 static void tegra_dsi_set_timeout(struct tegra_dsi *dsi, unsigned long bclk, 706 unsigned int vrefresh) 707 { 708 unsigned int timeout; 709 u32 value; 710 711 /* one frame high-speed transmission timeout */ 712 timeout = (bclk / vrefresh) / 512; 713 value = DSI_TIMEOUT_LRX(0x2000) | DSI_TIMEOUT_HTX(timeout); 714 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_0); 715 716 /* 2 ms peripheral timeout for panel */ 717 timeout = 2 * bclk / 512 * 1000; 718 value = DSI_TIMEOUT_PR(timeout) | DSI_TIMEOUT_TA(0x2000); 719 tegra_dsi_writel(dsi, value, DSI_TIMEOUT_1); 720 721 value = DSI_TALLY_TA(0) | DSI_TALLY_LRX(0) | DSI_TALLY_HTX(0); 722 tegra_dsi_writel(dsi, value, DSI_TO_TALLY); 723 724 if (dsi->slave) 725 tegra_dsi_set_timeout(dsi->slave, bclk, vrefresh); 726 } 727 728 static void tegra_dsi_disable(struct tegra_dsi *dsi) 729 { 730 u32 value; 731 732 if (dsi->slave) { 733 tegra_dsi_ganged_disable(dsi->slave); 734 tegra_dsi_ganged_disable(dsi); 735 } 736 737 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 738 value &= ~DSI_POWER_CONTROL_ENABLE; 739 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 740 741 if (dsi->slave) 742 tegra_dsi_disable(dsi->slave); 743 744 usleep_range(5000, 10000); 745 } 746 747 static void tegra_dsi_soft_reset(struct tegra_dsi *dsi) 748 { 749 u32 value; 750 751 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 752 value &= ~DSI_POWER_CONTROL_ENABLE; 753 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 754 755 usleep_range(300, 1000); 756 757 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 758 value |= DSI_POWER_CONTROL_ENABLE; 759 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 760 761 usleep_range(300, 1000); 762 763 value = tegra_dsi_readl(dsi, DSI_TRIGGER); 764 if (value) 765 tegra_dsi_writel(dsi, 0, DSI_TRIGGER); 766 767 if (dsi->slave) 768 tegra_dsi_soft_reset(dsi->slave); 769 } 770 771 static void tegra_dsi_connector_reset(struct drm_connector *connector) 772 { 773 struct tegra_dsi_state *state = kzalloc(sizeof(*state), GFP_KERNEL); 774 775 if (!state) 776 return; 777 778 if (connector->state) { 779 __drm_atomic_helper_connector_destroy_state(connector->state); 780 kfree(connector->state); 781 } 782 783 __drm_atomic_helper_connector_reset(connector, &state->base); 784 } 785 786 static struct drm_connector_state * 787 tegra_dsi_connector_duplicate_state(struct drm_connector *connector) 788 { 789 struct tegra_dsi_state *state = to_dsi_state(connector->state); 790 struct tegra_dsi_state *copy; 791 792 copy = kmemdup(state, sizeof(*state), GFP_KERNEL); 793 if (!copy) 794 return NULL; 795 796 __drm_atomic_helper_connector_duplicate_state(connector, 797 ©->base); 798 799 return ©->base; 800 } 801 802 static const struct drm_connector_funcs tegra_dsi_connector_funcs = { 803 .reset = tegra_dsi_connector_reset, 804 .detect = tegra_output_connector_detect, 805 .fill_modes = drm_helper_probe_single_connector_modes, 806 .destroy = tegra_output_connector_destroy, 807 .atomic_duplicate_state = tegra_dsi_connector_duplicate_state, 808 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 809 .late_register = tegra_dsi_late_register, 810 .early_unregister = tegra_dsi_early_unregister, 811 }; 812 813 static enum drm_mode_status 814 tegra_dsi_connector_mode_valid(struct drm_connector *connector, 815 const struct drm_display_mode *mode) 816 { 817 return MODE_OK; 818 } 819 820 static const struct drm_connector_helper_funcs tegra_dsi_connector_helper_funcs = { 821 .get_modes = tegra_output_connector_get_modes, 822 .mode_valid = tegra_dsi_connector_mode_valid, 823 }; 824 825 static void tegra_dsi_unprepare(struct tegra_dsi *dsi) 826 { 827 int err; 828 829 if (dsi->slave) 830 tegra_dsi_unprepare(dsi->slave); 831 832 err = tegra_mipi_disable(dsi->mipi); 833 if (err < 0) 834 dev_err(dsi->dev, "failed to disable MIPI calibration: %d\n", 835 err); 836 837 err = host1x_client_suspend(&dsi->client); 838 if (err < 0) 839 dev_err(dsi->dev, "failed to suspend: %d\n", err); 840 } 841 842 static void tegra_dsi_encoder_disable(struct drm_encoder *encoder) 843 { 844 struct tegra_output *output = encoder_to_output(encoder); 845 struct tegra_dc *dc = to_tegra_dc(encoder->crtc); 846 struct tegra_dsi *dsi = to_dsi(output); 847 u32 value; 848 int err; 849 850 if (output->panel) 851 drm_panel_disable(output->panel); 852 853 tegra_dsi_video_disable(dsi); 854 855 /* 856 * The following accesses registers of the display controller, so make 857 * sure it's only executed when the output is attached to one. 858 */ 859 if (dc) { 860 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS); 861 value &= ~DSI_ENABLE; 862 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS); 863 864 tegra_dc_commit(dc); 865 } 866 867 err = tegra_dsi_wait_idle(dsi, 100); 868 if (err < 0) 869 dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err); 870 871 tegra_dsi_soft_reset(dsi); 872 873 if (output->panel) 874 drm_panel_unprepare(output->panel); 875 876 tegra_dsi_disable(dsi); 877 878 tegra_dsi_unprepare(dsi); 879 } 880 881 static int tegra_dsi_prepare(struct tegra_dsi *dsi) 882 { 883 int err; 884 885 err = host1x_client_resume(&dsi->client); 886 if (err < 0) { 887 dev_err(dsi->dev, "failed to resume: %d\n", err); 888 return err; 889 } 890 891 err = tegra_mipi_enable(dsi->mipi); 892 if (err < 0) 893 dev_err(dsi->dev, "failed to enable MIPI calibration: %d\n", 894 err); 895 896 err = tegra_dsi_pad_calibrate(dsi); 897 if (err < 0) 898 dev_err(dsi->dev, "MIPI calibration failed: %d\n", err); 899 900 if (dsi->slave) 901 tegra_dsi_prepare(dsi->slave); 902 903 return 0; 904 } 905 906 static void tegra_dsi_encoder_enable(struct drm_encoder *encoder) 907 { 908 struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode; 909 struct tegra_output *output = encoder_to_output(encoder); 910 struct tegra_dc *dc = to_tegra_dc(encoder->crtc); 911 struct tegra_dsi *dsi = to_dsi(output); 912 struct tegra_dsi_state *state; 913 u32 value; 914 int err; 915 916 err = tegra_dsi_prepare(dsi); 917 if (err < 0) { 918 dev_err(dsi->dev, "failed to prepare: %d\n", err); 919 return; 920 } 921 922 state = tegra_dsi_get_state(dsi); 923 924 tegra_dsi_set_timeout(dsi, state->bclk, state->vrefresh); 925 926 /* 927 * The D-PHY timing fields are expressed in byte-clock cycles, so 928 * multiply the period by 8. 929 */ 930 tegra_dsi_set_phy_timing(dsi, state->period * 8, &state->timing); 931 932 if (output->panel) 933 drm_panel_prepare(output->panel); 934 935 tegra_dsi_configure(dsi, dc->pipe, mode); 936 937 /* enable display controller */ 938 value = tegra_dc_readl(dc, DC_DISP_DISP_WIN_OPTIONS); 939 value |= DSI_ENABLE; 940 tegra_dc_writel(dc, value, DC_DISP_DISP_WIN_OPTIONS); 941 942 tegra_dc_commit(dc); 943 944 /* enable DSI controller */ 945 tegra_dsi_enable(dsi); 946 947 if (output->panel) 948 drm_panel_enable(output->panel); 949 } 950 951 static int 952 tegra_dsi_encoder_atomic_check(struct drm_encoder *encoder, 953 struct drm_crtc_state *crtc_state, 954 struct drm_connector_state *conn_state) 955 { 956 struct tegra_output *output = encoder_to_output(encoder); 957 struct tegra_dsi_state *state = to_dsi_state(conn_state); 958 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc); 959 struct tegra_dsi *dsi = to_dsi(output); 960 unsigned int scdiv; 961 unsigned long plld; 962 int err; 963 964 state->pclk = crtc_state->mode.clock * 1000; 965 966 err = tegra_dsi_get_muldiv(dsi->format, &state->mul, &state->div); 967 if (err < 0) 968 return err; 969 970 state->lanes = tegra_dsi_get_lanes(dsi); 971 972 err = tegra_dsi_get_format(dsi->format, &state->format); 973 if (err < 0) 974 return err; 975 976 state->vrefresh = drm_mode_vrefresh(&crtc_state->mode); 977 978 /* compute byte clock */ 979 state->bclk = (state->pclk * state->mul) / (state->div * state->lanes); 980 981 DRM_DEBUG_KMS("mul: %u, div: %u, lanes: %u\n", state->mul, state->div, 982 state->lanes); 983 DRM_DEBUG_KMS("format: %u, vrefresh: %u\n", state->format, 984 state->vrefresh); 985 DRM_DEBUG_KMS("bclk: %lu\n", state->bclk); 986 987 /* 988 * Compute bit clock and round up to the next MHz. 989 */ 990 plld = DIV_ROUND_UP(state->bclk * 8, USEC_PER_SEC) * USEC_PER_SEC; 991 state->period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, plld); 992 993 err = mipi_dphy_timing_get_default(&state->timing, state->period); 994 if (err < 0) 995 return err; 996 997 err = mipi_dphy_timing_validate(&state->timing, state->period); 998 if (err < 0) { 999 dev_err(dsi->dev, "failed to validate D-PHY timing: %d\n", err); 1000 return err; 1001 } 1002 1003 /* 1004 * We divide the frequency by two here, but we make up for that by 1005 * setting the shift clock divider (further below) to half of the 1006 * correct value. 1007 */ 1008 plld /= 2; 1009 1010 /* 1011 * Derive pixel clock from bit clock using the shift clock divider. 1012 * Note that this is only half of what we would expect, but we need 1013 * that to make up for the fact that we divided the bit clock by a 1014 * factor of two above. 1015 * 1016 * It's not clear exactly why this is necessary, but the display is 1017 * not working properly otherwise. Perhaps the PLLs cannot generate 1018 * frequencies sufficiently high. 1019 */ 1020 scdiv = ((8 * state->mul) / (state->div * state->lanes)) - 2; 1021 1022 err = tegra_dc_state_setup_clock(dc, crtc_state, dsi->clk_parent, 1023 plld, scdiv); 1024 if (err < 0) { 1025 dev_err(output->dev, "failed to setup CRTC state: %d\n", err); 1026 return err; 1027 } 1028 1029 return err; 1030 } 1031 1032 static const struct drm_encoder_helper_funcs tegra_dsi_encoder_helper_funcs = { 1033 .disable = tegra_dsi_encoder_disable, 1034 .enable = tegra_dsi_encoder_enable, 1035 .atomic_check = tegra_dsi_encoder_atomic_check, 1036 }; 1037 1038 static int tegra_dsi_init(struct host1x_client *client) 1039 { 1040 struct drm_device *drm = dev_get_drvdata(client->host); 1041 struct tegra_dsi *dsi = host1x_client_to_dsi(client); 1042 int err; 1043 1044 /* Gangsters must not register their own outputs. */ 1045 if (!dsi->master) { 1046 dsi->output.dev = client->dev; 1047 1048 drm_connector_init(drm, &dsi->output.connector, 1049 &tegra_dsi_connector_funcs, 1050 DRM_MODE_CONNECTOR_DSI); 1051 drm_connector_helper_add(&dsi->output.connector, 1052 &tegra_dsi_connector_helper_funcs); 1053 dsi->output.connector.dpms = DRM_MODE_DPMS_OFF; 1054 1055 drm_simple_encoder_init(drm, &dsi->output.encoder, 1056 DRM_MODE_ENCODER_DSI); 1057 drm_encoder_helper_add(&dsi->output.encoder, 1058 &tegra_dsi_encoder_helper_funcs); 1059 1060 drm_connector_attach_encoder(&dsi->output.connector, 1061 &dsi->output.encoder); 1062 drm_connector_register(&dsi->output.connector); 1063 1064 err = tegra_output_init(drm, &dsi->output); 1065 if (err < 0) 1066 dev_err(dsi->dev, "failed to initialize output: %d\n", 1067 err); 1068 1069 dsi->output.encoder.possible_crtcs = 0x3; 1070 } 1071 1072 return 0; 1073 } 1074 1075 static int tegra_dsi_exit(struct host1x_client *client) 1076 { 1077 struct tegra_dsi *dsi = host1x_client_to_dsi(client); 1078 1079 tegra_output_exit(&dsi->output); 1080 1081 return 0; 1082 } 1083 1084 static int tegra_dsi_runtime_suspend(struct host1x_client *client) 1085 { 1086 struct tegra_dsi *dsi = host1x_client_to_dsi(client); 1087 struct device *dev = client->dev; 1088 int err; 1089 1090 if (dsi->rst) { 1091 err = reset_control_assert(dsi->rst); 1092 if (err < 0) { 1093 dev_err(dev, "failed to assert reset: %d\n", err); 1094 return err; 1095 } 1096 } 1097 1098 usleep_range(1000, 2000); 1099 1100 clk_disable_unprepare(dsi->clk_lp); 1101 clk_disable_unprepare(dsi->clk); 1102 1103 regulator_disable(dsi->vdd); 1104 pm_runtime_put_sync(dev); 1105 1106 return 0; 1107 } 1108 1109 static int tegra_dsi_runtime_resume(struct host1x_client *client) 1110 { 1111 struct tegra_dsi *dsi = host1x_client_to_dsi(client); 1112 struct device *dev = client->dev; 1113 int err; 1114 1115 err = pm_runtime_resume_and_get(dev); 1116 if (err < 0) { 1117 dev_err(dev, "failed to get runtime PM: %d\n", err); 1118 return err; 1119 } 1120 1121 err = regulator_enable(dsi->vdd); 1122 if (err < 0) { 1123 dev_err(dev, "failed to enable VDD supply: %d\n", err); 1124 goto put_rpm; 1125 } 1126 1127 err = clk_prepare_enable(dsi->clk); 1128 if (err < 0) { 1129 dev_err(dev, "cannot enable DSI clock: %d\n", err); 1130 goto disable_vdd; 1131 } 1132 1133 err = clk_prepare_enable(dsi->clk_lp); 1134 if (err < 0) { 1135 dev_err(dev, "cannot enable low-power clock: %d\n", err); 1136 goto disable_clk; 1137 } 1138 1139 usleep_range(1000, 2000); 1140 1141 if (dsi->rst) { 1142 err = reset_control_deassert(dsi->rst); 1143 if (err < 0) { 1144 dev_err(dev, "cannot assert reset: %d\n", err); 1145 goto disable_clk_lp; 1146 } 1147 } 1148 1149 return 0; 1150 1151 disable_clk_lp: 1152 clk_disable_unprepare(dsi->clk_lp); 1153 disable_clk: 1154 clk_disable_unprepare(dsi->clk); 1155 disable_vdd: 1156 regulator_disable(dsi->vdd); 1157 put_rpm: 1158 pm_runtime_put_sync(dev); 1159 return err; 1160 } 1161 1162 static const struct host1x_client_ops dsi_client_ops = { 1163 .init = tegra_dsi_init, 1164 .exit = tegra_dsi_exit, 1165 .suspend = tegra_dsi_runtime_suspend, 1166 .resume = tegra_dsi_runtime_resume, 1167 }; 1168 1169 static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi) 1170 { 1171 struct clk *parent; 1172 int err; 1173 1174 parent = clk_get_parent(dsi->clk); 1175 if (!parent) 1176 return -EINVAL; 1177 1178 err = clk_set_parent(parent, dsi->clk_parent); 1179 if (err < 0) 1180 return err; 1181 1182 return 0; 1183 } 1184 1185 static const char * const error_report[16] = { 1186 "SoT Error", 1187 "SoT Sync Error", 1188 "EoT Sync Error", 1189 "Escape Mode Entry Command Error", 1190 "Low-Power Transmit Sync Error", 1191 "Peripheral Timeout Error", 1192 "False Control Error", 1193 "Contention Detected", 1194 "ECC Error, single-bit", 1195 "ECC Error, multi-bit", 1196 "Checksum Error", 1197 "DSI Data Type Not Recognized", 1198 "DSI VC ID Invalid", 1199 "Invalid Transmission Length", 1200 "Reserved", 1201 "DSI Protocol Violation", 1202 }; 1203 1204 static ssize_t tegra_dsi_read_response(struct tegra_dsi *dsi, 1205 const struct mipi_dsi_msg *msg, 1206 size_t count) 1207 { 1208 u8 *rx = msg->rx_buf; 1209 unsigned int i, j, k; 1210 size_t size = 0; 1211 u16 errors; 1212 u32 value; 1213 1214 /* read and parse packet header */ 1215 value = tegra_dsi_readl(dsi, DSI_RD_DATA); 1216 1217 switch (value & 0x3f) { 1218 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT: 1219 errors = (value >> 8) & 0xffff; 1220 dev_dbg(dsi->dev, "Acknowledge and error report: %04x\n", 1221 errors); 1222 for (i = 0; i < ARRAY_SIZE(error_report); i++) 1223 if (errors & BIT(i)) 1224 dev_dbg(dsi->dev, " %2u: %s\n", i, 1225 error_report[i]); 1226 break; 1227 1228 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE: 1229 rx[0] = (value >> 8) & 0xff; 1230 size = 1; 1231 break; 1232 1233 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE: 1234 rx[0] = (value >> 8) & 0xff; 1235 rx[1] = (value >> 16) & 0xff; 1236 size = 2; 1237 break; 1238 1239 case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE: 1240 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff); 1241 break; 1242 1243 case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE: 1244 size = ((value >> 8) & 0xff00) | ((value >> 8) & 0xff); 1245 break; 1246 1247 default: 1248 dev_err(dsi->dev, "unhandled response type: %02x\n", 1249 value & 0x3f); 1250 return -EPROTO; 1251 } 1252 1253 size = min(size, msg->rx_len); 1254 1255 if (msg->rx_buf && size > 0) { 1256 for (i = 0, j = 0; i < count - 1; i++, j += 4) { 1257 u8 *rx = msg->rx_buf + j; 1258 1259 value = tegra_dsi_readl(dsi, DSI_RD_DATA); 1260 1261 for (k = 0; k < 4 && (j + k) < msg->rx_len; k++) 1262 rx[j + k] = (value >> (k << 3)) & 0xff; 1263 } 1264 } 1265 1266 return size; 1267 } 1268 1269 static int tegra_dsi_transmit(struct tegra_dsi *dsi, unsigned long timeout) 1270 { 1271 tegra_dsi_writel(dsi, DSI_TRIGGER_HOST, DSI_TRIGGER); 1272 1273 timeout = jiffies + msecs_to_jiffies(timeout); 1274 1275 while (time_before(jiffies, timeout)) { 1276 u32 value = tegra_dsi_readl(dsi, DSI_TRIGGER); 1277 if ((value & DSI_TRIGGER_HOST) == 0) 1278 return 0; 1279 1280 usleep_range(1000, 2000); 1281 } 1282 1283 DRM_DEBUG_KMS("timeout waiting for transmission to complete\n"); 1284 return -ETIMEDOUT; 1285 } 1286 1287 static int tegra_dsi_wait_for_response(struct tegra_dsi *dsi, 1288 unsigned long timeout) 1289 { 1290 timeout = jiffies + msecs_to_jiffies(250); 1291 1292 while (time_before(jiffies, timeout)) { 1293 u32 value = tegra_dsi_readl(dsi, DSI_STATUS); 1294 u8 count = value & 0x1f; 1295 1296 if (count > 0) 1297 return count; 1298 1299 usleep_range(1000, 2000); 1300 } 1301 1302 DRM_DEBUG_KMS("peripheral returned no data\n"); 1303 return -ETIMEDOUT; 1304 } 1305 1306 static void tegra_dsi_writesl(struct tegra_dsi *dsi, unsigned long offset, 1307 const void *buffer, size_t size) 1308 { 1309 const u8 *buf = buffer; 1310 size_t i, j; 1311 u32 value; 1312 1313 for (j = 0; j < size; j += 4) { 1314 value = 0; 1315 1316 for (i = 0; i < 4 && j + i < size; i++) 1317 value |= buf[j + i] << (i << 3); 1318 1319 tegra_dsi_writel(dsi, value, DSI_WR_DATA); 1320 } 1321 } 1322 1323 static ssize_t tegra_dsi_host_transfer(struct mipi_dsi_host *host, 1324 const struct mipi_dsi_msg *msg) 1325 { 1326 struct tegra_dsi *dsi = host_to_tegra(host); 1327 struct mipi_dsi_packet packet; 1328 const u8 *header; 1329 size_t count; 1330 ssize_t err; 1331 u32 value; 1332 1333 err = mipi_dsi_create_packet(&packet, msg); 1334 if (err < 0) 1335 return err; 1336 1337 header = packet.header; 1338 1339 /* maximum FIFO depth is 1920 words */ 1340 if (packet.size > dsi->video_fifo_depth * 4) 1341 return -ENOSPC; 1342 1343 /* reset underflow/overflow flags */ 1344 value = tegra_dsi_readl(dsi, DSI_STATUS); 1345 if (value & (DSI_STATUS_UNDERFLOW | DSI_STATUS_OVERFLOW)) { 1346 value = DSI_HOST_CONTROL_FIFO_RESET; 1347 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 1348 usleep_range(10, 20); 1349 } 1350 1351 value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL); 1352 value |= DSI_POWER_CONTROL_ENABLE; 1353 tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL); 1354 1355 usleep_range(5000, 10000); 1356 1357 value = DSI_HOST_CONTROL_CRC_RESET | DSI_HOST_CONTROL_TX_TRIG_HOST | 1358 DSI_HOST_CONTROL_CS | DSI_HOST_CONTROL_ECC; 1359 1360 if ((msg->flags & MIPI_DSI_MSG_USE_LPM) == 0) 1361 value |= DSI_HOST_CONTROL_HS; 1362 1363 /* 1364 * The host FIFO has a maximum of 64 words, so larger transmissions 1365 * need to use the video FIFO. 1366 */ 1367 if (packet.size > dsi->host_fifo_depth * 4) 1368 value |= DSI_HOST_CONTROL_FIFO_SEL; 1369 1370 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 1371 1372 /* 1373 * For reads and messages with explicitly requested ACK, generate a 1374 * BTA sequence after the transmission of the packet. 1375 */ 1376 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) || 1377 (msg->rx_buf && msg->rx_len > 0)) { 1378 value = tegra_dsi_readl(dsi, DSI_HOST_CONTROL); 1379 value |= DSI_HOST_CONTROL_PKT_BTA; 1380 tegra_dsi_writel(dsi, value, DSI_HOST_CONTROL); 1381 } 1382 1383 value = DSI_CONTROL_LANES(0) | DSI_CONTROL_HOST_ENABLE; 1384 tegra_dsi_writel(dsi, value, DSI_CONTROL); 1385 1386 /* write packet header, ECC is generated by hardware */ 1387 value = header[2] << 16 | header[1] << 8 | header[0]; 1388 tegra_dsi_writel(dsi, value, DSI_WR_DATA); 1389 1390 /* write payload (if any) */ 1391 if (packet.payload_length > 0) 1392 tegra_dsi_writesl(dsi, DSI_WR_DATA, packet.payload, 1393 packet.payload_length); 1394 1395 err = tegra_dsi_transmit(dsi, 250); 1396 if (err < 0) 1397 return err; 1398 1399 if ((msg->flags & MIPI_DSI_MSG_REQ_ACK) || 1400 (msg->rx_buf && msg->rx_len > 0)) { 1401 err = tegra_dsi_wait_for_response(dsi, 250); 1402 if (err < 0) 1403 return err; 1404 1405 count = err; 1406 1407 value = tegra_dsi_readl(dsi, DSI_RD_DATA); 1408 switch (value) { 1409 case 0x84: 1410 /* 1411 dev_dbg(dsi->dev, "ACK\n"); 1412 */ 1413 break; 1414 1415 case 0x87: 1416 /* 1417 dev_dbg(dsi->dev, "ESCAPE\n"); 1418 */ 1419 break; 1420 1421 default: 1422 dev_err(dsi->dev, "unknown status: %08x\n", value); 1423 break; 1424 } 1425 1426 if (count > 1) { 1427 err = tegra_dsi_read_response(dsi, msg, count); 1428 if (err < 0) 1429 dev_err(dsi->dev, 1430 "failed to parse response: %zd\n", 1431 err); 1432 else { 1433 /* 1434 * For read commands, return the number of 1435 * bytes returned by the peripheral. 1436 */ 1437 count = err; 1438 } 1439 } 1440 } else { 1441 /* 1442 * For write commands, we have transmitted the 4-byte header 1443 * plus the variable-length payload. 1444 */ 1445 count = 4 + packet.payload_length; 1446 } 1447 1448 return count; 1449 } 1450 1451 static int tegra_dsi_ganged_setup(struct tegra_dsi *dsi) 1452 { 1453 struct clk *parent; 1454 int err; 1455 1456 /* make sure both DSI controllers share the same PLL */ 1457 parent = clk_get_parent(dsi->slave->clk); 1458 if (!parent) 1459 return -EINVAL; 1460 1461 err = clk_set_parent(parent, dsi->clk_parent); 1462 if (err < 0) 1463 return err; 1464 1465 return 0; 1466 } 1467 1468 static int tegra_dsi_host_attach(struct mipi_dsi_host *host, 1469 struct mipi_dsi_device *device) 1470 { 1471 struct tegra_dsi *dsi = host_to_tegra(host); 1472 1473 dsi->flags = device->mode_flags; 1474 dsi->format = device->format; 1475 dsi->lanes = device->lanes; 1476 1477 if (dsi->slave) { 1478 int err; 1479 1480 dev_dbg(dsi->dev, "attaching dual-channel device %s\n", 1481 dev_name(&device->dev)); 1482 1483 err = tegra_dsi_ganged_setup(dsi); 1484 if (err < 0) { 1485 dev_err(dsi->dev, "failed to set up ganged mode: %d\n", 1486 err); 1487 return err; 1488 } 1489 } 1490 1491 /* 1492 * Slaves don't have a panel associated with them, so they provide 1493 * merely the second channel. 1494 */ 1495 if (!dsi->master) { 1496 struct tegra_output *output = &dsi->output; 1497 1498 output->panel = of_drm_find_panel(device->dev.of_node); 1499 if (IS_ERR(output->panel)) 1500 output->panel = NULL; 1501 1502 if (output->panel && output->connector.dev) 1503 drm_helper_hpd_irq_event(output->connector.dev); 1504 } 1505 1506 return 0; 1507 } 1508 1509 static int tegra_dsi_host_detach(struct mipi_dsi_host *host, 1510 struct mipi_dsi_device *device) 1511 { 1512 struct tegra_dsi *dsi = host_to_tegra(host); 1513 struct tegra_output *output = &dsi->output; 1514 1515 if (output->panel && &device->dev == output->panel->dev) { 1516 output->panel = NULL; 1517 1518 if (output->connector.dev) 1519 drm_helper_hpd_irq_event(output->connector.dev); 1520 } 1521 1522 return 0; 1523 } 1524 1525 static const struct mipi_dsi_host_ops tegra_dsi_host_ops = { 1526 .attach = tegra_dsi_host_attach, 1527 .detach = tegra_dsi_host_detach, 1528 .transfer = tegra_dsi_host_transfer, 1529 }; 1530 1531 static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi) 1532 { 1533 struct device_node *np; 1534 1535 np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0); 1536 if (np) { 1537 struct platform_device *gangster = of_find_device_by_node(np); 1538 of_node_put(np); 1539 if (!gangster) 1540 return -EPROBE_DEFER; 1541 1542 dsi->slave = platform_get_drvdata(gangster); 1543 1544 if (!dsi->slave) { 1545 put_device(&gangster->dev); 1546 return -EPROBE_DEFER; 1547 } 1548 1549 dsi->slave->master = dsi; 1550 } 1551 1552 return 0; 1553 } 1554 1555 static int tegra_dsi_probe(struct platform_device *pdev) 1556 { 1557 struct tegra_dsi *dsi; 1558 int err; 1559 1560 dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL); 1561 if (!dsi) 1562 return -ENOMEM; 1563 1564 dsi->output.dev = dsi->dev = &pdev->dev; 1565 dsi->video_fifo_depth = 1920; 1566 dsi->host_fifo_depth = 64; 1567 1568 err = tegra_dsi_ganged_probe(dsi); 1569 if (err < 0) 1570 return err; 1571 1572 err = tegra_output_probe(&dsi->output); 1573 if (err < 0) 1574 return err; 1575 1576 dsi->output.connector.polled = DRM_CONNECTOR_POLL_HPD; 1577 1578 /* 1579 * Assume these values by default. When a DSI peripheral driver 1580 * attaches to the DSI host, the parameters will be taken from 1581 * the attached device. 1582 */ 1583 dsi->flags = MIPI_DSI_MODE_VIDEO; 1584 dsi->format = MIPI_DSI_FMT_RGB888; 1585 dsi->lanes = 4; 1586 1587 if (!pdev->dev.pm_domain) { 1588 dsi->rst = devm_reset_control_get(&pdev->dev, "dsi"); 1589 if (IS_ERR(dsi->rst)) { 1590 err = PTR_ERR(dsi->rst); 1591 goto remove; 1592 } 1593 } 1594 1595 dsi->clk = devm_clk_get(&pdev->dev, NULL); 1596 if (IS_ERR(dsi->clk)) { 1597 err = dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk), 1598 "cannot get DSI clock\n"); 1599 goto remove; 1600 } 1601 1602 dsi->clk_lp = devm_clk_get(&pdev->dev, "lp"); 1603 if (IS_ERR(dsi->clk_lp)) { 1604 err = dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk_lp), 1605 "cannot get low-power clock\n"); 1606 goto remove; 1607 } 1608 1609 dsi->clk_parent = devm_clk_get(&pdev->dev, "parent"); 1610 if (IS_ERR(dsi->clk_parent)) { 1611 err = dev_err_probe(&pdev->dev, PTR_ERR(dsi->clk_parent), 1612 "cannot get parent clock\n"); 1613 goto remove; 1614 } 1615 1616 dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi"); 1617 if (IS_ERR(dsi->vdd)) { 1618 err = dev_err_probe(&pdev->dev, PTR_ERR(dsi->vdd), 1619 "cannot get VDD supply\n"); 1620 goto remove; 1621 } 1622 1623 err = tegra_dsi_setup_clocks(dsi); 1624 if (err < 0) { 1625 dev_err(&pdev->dev, "cannot setup clocks\n"); 1626 goto remove; 1627 } 1628 1629 dsi->regs = devm_platform_ioremap_resource(pdev, 0); 1630 if (IS_ERR(dsi->regs)) { 1631 err = PTR_ERR(dsi->regs); 1632 goto remove; 1633 } 1634 1635 dsi->mipi = tegra_mipi_request(&pdev->dev, pdev->dev.of_node); 1636 if (IS_ERR(dsi->mipi)) { 1637 err = PTR_ERR(dsi->mipi); 1638 goto remove; 1639 } 1640 1641 dsi->host.ops = &tegra_dsi_host_ops; 1642 dsi->host.dev = &pdev->dev; 1643 1644 err = mipi_dsi_host_register(&dsi->host); 1645 if (err < 0) { 1646 dev_err(&pdev->dev, "failed to register DSI host: %d\n", err); 1647 goto mipi_free; 1648 } 1649 1650 platform_set_drvdata(pdev, dsi); 1651 pm_runtime_enable(&pdev->dev); 1652 1653 INIT_LIST_HEAD(&dsi->client.list); 1654 dsi->client.ops = &dsi_client_ops; 1655 dsi->client.dev = &pdev->dev; 1656 1657 err = host1x_client_register(&dsi->client); 1658 if (err < 0) { 1659 dev_err(&pdev->dev, "failed to register host1x client: %d\n", 1660 err); 1661 goto unregister; 1662 } 1663 1664 return 0; 1665 1666 unregister: 1667 pm_runtime_disable(&pdev->dev); 1668 mipi_dsi_host_unregister(&dsi->host); 1669 mipi_free: 1670 tegra_mipi_free(dsi->mipi); 1671 remove: 1672 tegra_output_remove(&dsi->output); 1673 return err; 1674 } 1675 1676 static void tegra_dsi_remove(struct platform_device *pdev) 1677 { 1678 struct tegra_dsi *dsi = platform_get_drvdata(pdev); 1679 1680 pm_runtime_disable(&pdev->dev); 1681 1682 host1x_client_unregister(&dsi->client); 1683 1684 tegra_output_remove(&dsi->output); 1685 1686 mipi_dsi_host_unregister(&dsi->host); 1687 tegra_mipi_free(dsi->mipi); 1688 } 1689 1690 static const struct of_device_id tegra_dsi_of_match[] = { 1691 { .compatible = "nvidia,tegra210-dsi", }, 1692 { .compatible = "nvidia,tegra132-dsi", }, 1693 { .compatible = "nvidia,tegra124-dsi", }, 1694 { .compatible = "nvidia,tegra114-dsi", }, 1695 { }, 1696 }; 1697 MODULE_DEVICE_TABLE(of, tegra_dsi_of_match); 1698 1699 struct platform_driver tegra_dsi_driver = { 1700 .driver = { 1701 .name = "tegra-dsi", 1702 .of_match_table = tegra_dsi_of_match, 1703 }, 1704 .probe = tegra_dsi_probe, 1705 .remove = tegra_dsi_remove, 1706 }; 1707