1 /* 2 * Copyright (C) 2016 Broadcom Limited 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 /** 18 * DOC: VC4 DPI module 19 * 20 * The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI 21 * signals, which are routed out to GPIO0-27 with the ALT2 function. 22 */ 23 24 #include "drm_atomic_helper.h" 25 #include "drm_crtc_helper.h" 26 #include "drm_edid.h" 27 #include "drm_panel.h" 28 #include "linux/clk.h" 29 #include "linux/component.h" 30 #include "linux/of_graph.h" 31 #include "linux/of_platform.h" 32 #include "vc4_drv.h" 33 #include "vc4_regs.h" 34 35 #define DPI_C 0x00 36 # define DPI_OUTPUT_ENABLE_MODE BIT(16) 37 38 /* The order field takes the incoming 24 bit RGB from the pixel valve 39 * and shuffles the 3 channels. 40 */ 41 # define DPI_ORDER_MASK VC4_MASK(15, 14) 42 # define DPI_ORDER_SHIFT 14 43 # define DPI_ORDER_RGB 0 44 # define DPI_ORDER_BGR 1 45 # define DPI_ORDER_GRB 2 46 # define DPI_ORDER_BRG 3 47 48 /* The format field takes the ORDER-shuffled pixel valve data and 49 * formats it onto the output lines. 50 */ 51 # define DPI_FORMAT_MASK VC4_MASK(13, 11) 52 # define DPI_FORMAT_SHIFT 11 53 /* This define is named in the hardware, but actually just outputs 0. */ 54 # define DPI_FORMAT_9BIT_666_RGB 0 55 /* Outputs 00000000rrrrrggggggbbbbb */ 56 # define DPI_FORMAT_16BIT_565_RGB_1 1 57 /* Outputs 000rrrrr00gggggg000bbbbb */ 58 # define DPI_FORMAT_16BIT_565_RGB_2 2 59 /* Outputs 00rrrrr000gggggg00bbbbb0 */ 60 # define DPI_FORMAT_16BIT_565_RGB_3 3 61 /* Outputs 000000rrrrrrggggggbbbbbb */ 62 # define DPI_FORMAT_18BIT_666_RGB_1 4 63 /* Outputs 00rrrrrr00gggggg00bbbbbb */ 64 # define DPI_FORMAT_18BIT_666_RGB_2 5 65 /* Outputs rrrrrrrrggggggggbbbbbbbb */ 66 # define DPI_FORMAT_24BIT_888_RGB 6 67 68 /* Reverses the polarity of the corresponding signal */ 69 # define DPI_PIXEL_CLK_INVERT BIT(10) 70 # define DPI_HSYNC_INVERT BIT(9) 71 # define DPI_VSYNC_INVERT BIT(8) 72 # define DPI_OUTPUT_ENABLE_INVERT BIT(7) 73 74 /* Outputs the signal the falling clock edge instead of rising. */ 75 # define DPI_HSYNC_NEGATE BIT(6) 76 # define DPI_VSYNC_NEGATE BIT(5) 77 # define DPI_OUTPUT_ENABLE_NEGATE BIT(4) 78 79 /* Disables the signal */ 80 # define DPI_HSYNC_DISABLE BIT(3) 81 # define DPI_VSYNC_DISABLE BIT(2) 82 # define DPI_OUTPUT_ENABLE_DISABLE BIT(1) 83 84 /* Power gate to the device, full reset at 0 -> 1 transition */ 85 # define DPI_ENABLE BIT(0) 86 87 /* All other registers besides DPI_C return the ID */ 88 #define DPI_ID 0x04 89 # define DPI_ID_VALUE 0x00647069 90 91 /* General DPI hardware state. */ 92 struct vc4_dpi { 93 struct platform_device *pdev; 94 95 struct drm_encoder *encoder; 96 struct drm_connector *connector; 97 struct drm_panel *panel; 98 99 void __iomem *regs; 100 101 struct clk *pixel_clock; 102 struct clk *core_clock; 103 }; 104 105 #define DPI_READ(offset) readl(dpi->regs + (offset)) 106 #define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset)) 107 108 /* VC4 DPI encoder KMS struct */ 109 struct vc4_dpi_encoder { 110 struct vc4_encoder base; 111 struct vc4_dpi *dpi; 112 }; 113 114 static inline struct vc4_dpi_encoder * 115 to_vc4_dpi_encoder(struct drm_encoder *encoder) 116 { 117 return container_of(encoder, struct vc4_dpi_encoder, base.base); 118 } 119 120 /* VC4 DPI connector KMS struct */ 121 struct vc4_dpi_connector { 122 struct drm_connector base; 123 struct vc4_dpi *dpi; 124 125 /* Since the connector is attached to just the one encoder, 126 * this is the reference to it so we can do the best_encoder() 127 * hook. 128 */ 129 struct drm_encoder *encoder; 130 }; 131 132 static inline struct vc4_dpi_connector * 133 to_vc4_dpi_connector(struct drm_connector *connector) 134 { 135 return container_of(connector, struct vc4_dpi_connector, base); 136 } 137 138 #define DPI_REG(reg) { reg, #reg } 139 static const struct { 140 u32 reg; 141 const char *name; 142 } dpi_regs[] = { 143 DPI_REG(DPI_C), 144 DPI_REG(DPI_ID), 145 }; 146 147 static void vc4_dpi_dump_regs(struct vc4_dpi *dpi) 148 { 149 int i; 150 151 for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) { 152 DRM_INFO("0x%04x (%s): 0x%08x\n", 153 dpi_regs[i].reg, dpi_regs[i].name, 154 DPI_READ(dpi_regs[i].reg)); 155 } 156 } 157 158 #ifdef CONFIG_DEBUG_FS 159 int vc4_dpi_debugfs_regs(struct seq_file *m, void *unused) 160 { 161 struct drm_info_node *node = (struct drm_info_node *)m->private; 162 struct drm_device *dev = node->minor->dev; 163 struct vc4_dev *vc4 = to_vc4_dev(dev); 164 struct vc4_dpi *dpi = vc4->dpi; 165 int i; 166 167 if (!dpi) 168 return 0; 169 170 for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) { 171 seq_printf(m, "%s (0x%04x): 0x%08x\n", 172 dpi_regs[i].name, dpi_regs[i].reg, 173 DPI_READ(dpi_regs[i].reg)); 174 } 175 176 return 0; 177 } 178 #endif 179 180 static enum drm_connector_status 181 vc4_dpi_connector_detect(struct drm_connector *connector, bool force) 182 { 183 struct vc4_dpi_connector *vc4_connector = 184 to_vc4_dpi_connector(connector); 185 struct vc4_dpi *dpi = vc4_connector->dpi; 186 187 if (dpi->panel) 188 return connector_status_connected; 189 else 190 return connector_status_disconnected; 191 } 192 193 static void vc4_dpi_connector_destroy(struct drm_connector *connector) 194 { 195 drm_connector_unregister(connector); 196 drm_connector_cleanup(connector); 197 } 198 199 static int vc4_dpi_connector_get_modes(struct drm_connector *connector) 200 { 201 struct vc4_dpi_connector *vc4_connector = 202 to_vc4_dpi_connector(connector); 203 struct vc4_dpi *dpi = vc4_connector->dpi; 204 205 if (dpi->panel) 206 return drm_panel_get_modes(dpi->panel); 207 208 return 0; 209 } 210 211 static struct drm_encoder * 212 vc4_dpi_connector_best_encoder(struct drm_connector *connector) 213 { 214 struct vc4_dpi_connector *dpi_connector = 215 to_vc4_dpi_connector(connector); 216 return dpi_connector->encoder; 217 } 218 219 static const struct drm_connector_funcs vc4_dpi_connector_funcs = { 220 .dpms = drm_atomic_helper_connector_dpms, 221 .detect = vc4_dpi_connector_detect, 222 .fill_modes = drm_helper_probe_single_connector_modes, 223 .destroy = vc4_dpi_connector_destroy, 224 .reset = drm_atomic_helper_connector_reset, 225 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 226 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 227 }; 228 229 static const struct drm_connector_helper_funcs vc4_dpi_connector_helper_funcs = { 230 .get_modes = vc4_dpi_connector_get_modes, 231 .best_encoder = vc4_dpi_connector_best_encoder, 232 }; 233 234 static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev, 235 struct vc4_dpi *dpi) 236 { 237 struct drm_connector *connector = NULL; 238 struct vc4_dpi_connector *dpi_connector; 239 int ret = 0; 240 241 dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector), 242 GFP_KERNEL); 243 if (!dpi_connector) { 244 ret = -ENOMEM; 245 goto fail; 246 } 247 connector = &dpi_connector->base; 248 249 dpi_connector->encoder = dpi->encoder; 250 dpi_connector->dpi = dpi; 251 252 drm_connector_init(dev, connector, &vc4_dpi_connector_funcs, 253 DRM_MODE_CONNECTOR_DPI); 254 drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs); 255 256 connector->polled = 0; 257 connector->interlace_allowed = 0; 258 connector->doublescan_allowed = 0; 259 260 drm_mode_connector_attach_encoder(connector, dpi->encoder); 261 262 return connector; 263 264 fail: 265 if (connector) 266 vc4_dpi_connector_destroy(connector); 267 268 return ERR_PTR(ret); 269 } 270 271 static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = { 272 .destroy = drm_encoder_cleanup, 273 }; 274 275 static void vc4_dpi_encoder_disable(struct drm_encoder *encoder) 276 { 277 struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder); 278 struct vc4_dpi *dpi = vc4_encoder->dpi; 279 280 drm_panel_disable(dpi->panel); 281 282 clk_disable_unprepare(dpi->pixel_clock); 283 284 drm_panel_unprepare(dpi->panel); 285 } 286 287 static void vc4_dpi_encoder_enable(struct drm_encoder *encoder) 288 { 289 struct drm_display_mode *mode = &encoder->crtc->mode; 290 struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder); 291 struct vc4_dpi *dpi = vc4_encoder->dpi; 292 u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE; 293 int ret; 294 295 ret = drm_panel_prepare(dpi->panel); 296 if (ret) { 297 DRM_ERROR("Panel failed to prepare\n"); 298 return; 299 } 300 301 if (dpi->connector->display_info.num_bus_formats) { 302 u32 bus_format = dpi->connector->display_info.bus_formats[0]; 303 304 switch (bus_format) { 305 case MEDIA_BUS_FMT_RGB888_1X24: 306 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, 307 DPI_FORMAT); 308 break; 309 case MEDIA_BUS_FMT_BGR888_1X24: 310 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, 311 DPI_FORMAT); 312 dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER); 313 break; 314 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 315 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2, 316 DPI_FORMAT); 317 break; 318 case MEDIA_BUS_FMT_RGB666_1X18: 319 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1, 320 DPI_FORMAT); 321 break; 322 case MEDIA_BUS_FMT_RGB565_1X16: 323 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3, 324 DPI_FORMAT); 325 break; 326 default: 327 DRM_ERROR("Unknown media bus format %d\n", bus_format); 328 break; 329 } 330 } 331 332 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 333 dpi_c |= DPI_HSYNC_INVERT; 334 else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC)) 335 dpi_c |= DPI_HSYNC_DISABLE; 336 337 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 338 dpi_c |= DPI_VSYNC_INVERT; 339 else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC)) 340 dpi_c |= DPI_VSYNC_DISABLE; 341 342 DPI_WRITE(DPI_C, dpi_c); 343 344 ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000); 345 if (ret) 346 DRM_ERROR("Failed to set clock rate: %d\n", ret); 347 348 ret = clk_prepare_enable(dpi->pixel_clock); 349 if (ret) 350 DRM_ERROR("Failed to set clock rate: %d\n", ret); 351 352 ret = drm_panel_enable(dpi->panel); 353 if (ret) { 354 DRM_ERROR("Panel failed to enable\n"); 355 drm_panel_unprepare(dpi->panel); 356 return; 357 } 358 } 359 360 static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = { 361 .disable = vc4_dpi_encoder_disable, 362 .enable = vc4_dpi_encoder_enable, 363 }; 364 365 static const struct of_device_id vc4_dpi_dt_match[] = { 366 { .compatible = "brcm,bcm2835-dpi", .data = NULL }, 367 {} 368 }; 369 370 /* Walks the OF graph to find the panel node and then asks DRM to look 371 * up the panel. 372 */ 373 static struct drm_panel *vc4_dpi_get_panel(struct device *dev) 374 { 375 struct device_node *endpoint, *panel_node; 376 struct device_node *np = dev->of_node; 377 struct drm_panel *panel; 378 379 endpoint = of_graph_get_next_endpoint(np, NULL); 380 if (!endpoint) { 381 dev_err(dev, "no endpoint to fetch DPI panel\n"); 382 return NULL; 383 } 384 385 /* don't proceed if we have an endpoint but no panel_node tied to it */ 386 panel_node = of_graph_get_remote_port_parent(endpoint); 387 of_node_put(endpoint); 388 if (!panel_node) { 389 dev_err(dev, "no valid panel node\n"); 390 return NULL; 391 } 392 393 panel = of_drm_find_panel(panel_node); 394 of_node_put(panel_node); 395 396 return panel; 397 } 398 399 static int vc4_dpi_bind(struct device *dev, struct device *master, void *data) 400 { 401 struct platform_device *pdev = to_platform_device(dev); 402 struct drm_device *drm = dev_get_drvdata(master); 403 struct vc4_dev *vc4 = to_vc4_dev(drm); 404 struct vc4_dpi *dpi; 405 struct vc4_dpi_encoder *vc4_dpi_encoder; 406 int ret; 407 408 dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL); 409 if (!dpi) 410 return -ENOMEM; 411 412 vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder), 413 GFP_KERNEL); 414 if (!vc4_dpi_encoder) 415 return -ENOMEM; 416 vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI; 417 vc4_dpi_encoder->dpi = dpi; 418 dpi->encoder = &vc4_dpi_encoder->base.base; 419 420 dpi->pdev = pdev; 421 dpi->regs = vc4_ioremap_regs(pdev, 0); 422 if (IS_ERR(dpi->regs)) 423 return PTR_ERR(dpi->regs); 424 425 vc4_dpi_dump_regs(dpi); 426 427 if (DPI_READ(DPI_ID) != DPI_ID_VALUE) { 428 dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n", 429 DPI_READ(DPI_ID), DPI_ID_VALUE); 430 return -ENODEV; 431 } 432 433 dpi->core_clock = devm_clk_get(dev, "core"); 434 if (IS_ERR(dpi->core_clock)) { 435 ret = PTR_ERR(dpi->core_clock); 436 if (ret != -EPROBE_DEFER) 437 DRM_ERROR("Failed to get core clock: %d\n", ret); 438 return ret; 439 } 440 dpi->pixel_clock = devm_clk_get(dev, "pixel"); 441 if (IS_ERR(dpi->pixel_clock)) { 442 ret = PTR_ERR(dpi->pixel_clock); 443 if (ret != -EPROBE_DEFER) 444 DRM_ERROR("Failed to get pixel clock: %d\n", ret); 445 return ret; 446 } 447 448 ret = clk_prepare_enable(dpi->core_clock); 449 if (ret) 450 DRM_ERROR("Failed to turn on core clock: %d\n", ret); 451 452 dpi->panel = vc4_dpi_get_panel(dev); 453 454 drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs, 455 DRM_MODE_ENCODER_DPI, NULL); 456 drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs); 457 458 dpi->connector = vc4_dpi_connector_init(drm, dpi); 459 if (IS_ERR(dpi->connector)) { 460 ret = PTR_ERR(dpi->connector); 461 goto err_destroy_encoder; 462 } 463 464 if (dpi->panel) 465 drm_panel_attach(dpi->panel, dpi->connector); 466 467 dev_set_drvdata(dev, dpi); 468 469 vc4->dpi = dpi; 470 471 return 0; 472 473 err_destroy_encoder: 474 drm_encoder_cleanup(dpi->encoder); 475 clk_disable_unprepare(dpi->core_clock); 476 return ret; 477 } 478 479 static void vc4_dpi_unbind(struct device *dev, struct device *master, 480 void *data) 481 { 482 struct drm_device *drm = dev_get_drvdata(master); 483 struct vc4_dev *vc4 = to_vc4_dev(drm); 484 struct vc4_dpi *dpi = dev_get_drvdata(dev); 485 486 if (dpi->panel) 487 drm_panel_detach(dpi->panel); 488 489 vc4_dpi_connector_destroy(dpi->connector); 490 drm_encoder_cleanup(dpi->encoder); 491 492 clk_disable_unprepare(dpi->core_clock); 493 494 vc4->dpi = NULL; 495 } 496 497 static const struct component_ops vc4_dpi_ops = { 498 .bind = vc4_dpi_bind, 499 .unbind = vc4_dpi_unbind, 500 }; 501 502 static int vc4_dpi_dev_probe(struct platform_device *pdev) 503 { 504 return component_add(&pdev->dev, &vc4_dpi_ops); 505 } 506 507 static int vc4_dpi_dev_remove(struct platform_device *pdev) 508 { 509 component_del(&pdev->dev, &vc4_dpi_ops); 510 return 0; 511 } 512 513 struct platform_driver vc4_dpi_driver = { 514 .probe = vc4_dpi_dev_probe, 515 .remove = vc4_dpi_dev_remove, 516 .driver = { 517 .name = "vc4_dpi", 518 .of_match_table = vc4_dpi_dt_match, 519 }, 520 }; 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