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 const struct drm_connector_funcs vc4_dpi_connector_funcs = { 212 .dpms = drm_atomic_helper_connector_dpms, 213 .detect = vc4_dpi_connector_detect, 214 .fill_modes = drm_helper_probe_single_connector_modes, 215 .destroy = vc4_dpi_connector_destroy, 216 .reset = drm_atomic_helper_connector_reset, 217 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 218 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 219 }; 220 221 static const struct drm_connector_helper_funcs vc4_dpi_connector_helper_funcs = { 222 .get_modes = vc4_dpi_connector_get_modes, 223 }; 224 225 static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev, 226 struct vc4_dpi *dpi) 227 { 228 struct drm_connector *connector = NULL; 229 struct vc4_dpi_connector *dpi_connector; 230 231 dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector), 232 GFP_KERNEL); 233 if (!dpi_connector) 234 return ERR_PTR(-ENOMEM); 235 236 connector = &dpi_connector->base; 237 238 dpi_connector->encoder = dpi->encoder; 239 dpi_connector->dpi = dpi; 240 241 drm_connector_init(dev, connector, &vc4_dpi_connector_funcs, 242 DRM_MODE_CONNECTOR_DPI); 243 drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs); 244 245 connector->polled = 0; 246 connector->interlace_allowed = 0; 247 connector->doublescan_allowed = 0; 248 249 drm_mode_connector_attach_encoder(connector, dpi->encoder); 250 251 return connector; 252 } 253 254 static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = { 255 .destroy = drm_encoder_cleanup, 256 }; 257 258 static void vc4_dpi_encoder_disable(struct drm_encoder *encoder) 259 { 260 struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder); 261 struct vc4_dpi *dpi = vc4_encoder->dpi; 262 263 drm_panel_disable(dpi->panel); 264 265 clk_disable_unprepare(dpi->pixel_clock); 266 267 drm_panel_unprepare(dpi->panel); 268 } 269 270 static void vc4_dpi_encoder_enable(struct drm_encoder *encoder) 271 { 272 struct drm_display_mode *mode = &encoder->crtc->mode; 273 struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder); 274 struct vc4_dpi *dpi = vc4_encoder->dpi; 275 u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE; 276 int ret; 277 278 ret = drm_panel_prepare(dpi->panel); 279 if (ret) { 280 DRM_ERROR("Panel failed to prepare\n"); 281 return; 282 } 283 284 if (dpi->connector->display_info.num_bus_formats) { 285 u32 bus_format = dpi->connector->display_info.bus_formats[0]; 286 287 switch (bus_format) { 288 case MEDIA_BUS_FMT_RGB888_1X24: 289 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, 290 DPI_FORMAT); 291 break; 292 case MEDIA_BUS_FMT_BGR888_1X24: 293 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, 294 DPI_FORMAT); 295 dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER); 296 break; 297 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 298 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2, 299 DPI_FORMAT); 300 break; 301 case MEDIA_BUS_FMT_RGB666_1X18: 302 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1, 303 DPI_FORMAT); 304 break; 305 case MEDIA_BUS_FMT_RGB565_1X16: 306 dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3, 307 DPI_FORMAT); 308 break; 309 default: 310 DRM_ERROR("Unknown media bus format %d\n", bus_format); 311 break; 312 } 313 } 314 315 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 316 dpi_c |= DPI_HSYNC_INVERT; 317 else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC)) 318 dpi_c |= DPI_HSYNC_DISABLE; 319 320 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 321 dpi_c |= DPI_VSYNC_INVERT; 322 else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC)) 323 dpi_c |= DPI_VSYNC_DISABLE; 324 325 DPI_WRITE(DPI_C, dpi_c); 326 327 ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000); 328 if (ret) 329 DRM_ERROR("Failed to set clock rate: %d\n", ret); 330 331 ret = clk_prepare_enable(dpi->pixel_clock); 332 if (ret) 333 DRM_ERROR("Failed to set clock rate: %d\n", ret); 334 335 ret = drm_panel_enable(dpi->panel); 336 if (ret) { 337 DRM_ERROR("Panel failed to enable\n"); 338 drm_panel_unprepare(dpi->panel); 339 return; 340 } 341 } 342 343 static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = { 344 .disable = vc4_dpi_encoder_disable, 345 .enable = vc4_dpi_encoder_enable, 346 }; 347 348 static const struct of_device_id vc4_dpi_dt_match[] = { 349 { .compatible = "brcm,bcm2835-dpi", .data = NULL }, 350 {} 351 }; 352 353 /* Walks the OF graph to find the panel node and then asks DRM to look 354 * up the panel. 355 */ 356 static struct drm_panel *vc4_dpi_get_panel(struct device *dev) 357 { 358 struct device_node *endpoint, *panel_node; 359 struct device_node *np = dev->of_node; 360 struct drm_panel *panel; 361 362 endpoint = of_graph_get_next_endpoint(np, NULL); 363 if (!endpoint) { 364 dev_err(dev, "no endpoint to fetch DPI panel\n"); 365 return NULL; 366 } 367 368 /* don't proceed if we have an endpoint but no panel_node tied to it */ 369 panel_node = of_graph_get_remote_port_parent(endpoint); 370 of_node_put(endpoint); 371 if (!panel_node) { 372 dev_err(dev, "no valid panel node\n"); 373 return NULL; 374 } 375 376 panel = of_drm_find_panel(panel_node); 377 of_node_put(panel_node); 378 379 return panel; 380 } 381 382 static int vc4_dpi_bind(struct device *dev, struct device *master, void *data) 383 { 384 struct platform_device *pdev = to_platform_device(dev); 385 struct drm_device *drm = dev_get_drvdata(master); 386 struct vc4_dev *vc4 = to_vc4_dev(drm); 387 struct vc4_dpi *dpi; 388 struct vc4_dpi_encoder *vc4_dpi_encoder; 389 int ret; 390 391 dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL); 392 if (!dpi) 393 return -ENOMEM; 394 395 vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder), 396 GFP_KERNEL); 397 if (!vc4_dpi_encoder) 398 return -ENOMEM; 399 vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI; 400 vc4_dpi_encoder->dpi = dpi; 401 dpi->encoder = &vc4_dpi_encoder->base.base; 402 403 dpi->pdev = pdev; 404 dpi->regs = vc4_ioremap_regs(pdev, 0); 405 if (IS_ERR(dpi->regs)) 406 return PTR_ERR(dpi->regs); 407 408 vc4_dpi_dump_regs(dpi); 409 410 if (DPI_READ(DPI_ID) != DPI_ID_VALUE) { 411 dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n", 412 DPI_READ(DPI_ID), DPI_ID_VALUE); 413 return -ENODEV; 414 } 415 416 dpi->core_clock = devm_clk_get(dev, "core"); 417 if (IS_ERR(dpi->core_clock)) { 418 ret = PTR_ERR(dpi->core_clock); 419 if (ret != -EPROBE_DEFER) 420 DRM_ERROR("Failed to get core clock: %d\n", ret); 421 return ret; 422 } 423 dpi->pixel_clock = devm_clk_get(dev, "pixel"); 424 if (IS_ERR(dpi->pixel_clock)) { 425 ret = PTR_ERR(dpi->pixel_clock); 426 if (ret != -EPROBE_DEFER) 427 DRM_ERROR("Failed to get pixel clock: %d\n", ret); 428 return ret; 429 } 430 431 ret = clk_prepare_enable(dpi->core_clock); 432 if (ret) 433 DRM_ERROR("Failed to turn on core clock: %d\n", ret); 434 435 dpi->panel = vc4_dpi_get_panel(dev); 436 437 drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs, 438 DRM_MODE_ENCODER_DPI, NULL); 439 drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs); 440 441 dpi->connector = vc4_dpi_connector_init(drm, dpi); 442 if (IS_ERR(dpi->connector)) { 443 ret = PTR_ERR(dpi->connector); 444 goto err_destroy_encoder; 445 } 446 447 if (dpi->panel) 448 drm_panel_attach(dpi->panel, dpi->connector); 449 450 dev_set_drvdata(dev, dpi); 451 452 vc4->dpi = dpi; 453 454 return 0; 455 456 err_destroy_encoder: 457 drm_encoder_cleanup(dpi->encoder); 458 clk_disable_unprepare(dpi->core_clock); 459 return ret; 460 } 461 462 static void vc4_dpi_unbind(struct device *dev, struct device *master, 463 void *data) 464 { 465 struct drm_device *drm = dev_get_drvdata(master); 466 struct vc4_dev *vc4 = to_vc4_dev(drm); 467 struct vc4_dpi *dpi = dev_get_drvdata(dev); 468 469 if (dpi->panel) 470 drm_panel_detach(dpi->panel); 471 472 vc4_dpi_connector_destroy(dpi->connector); 473 drm_encoder_cleanup(dpi->encoder); 474 475 clk_disable_unprepare(dpi->core_clock); 476 477 vc4->dpi = NULL; 478 } 479 480 static const struct component_ops vc4_dpi_ops = { 481 .bind = vc4_dpi_bind, 482 .unbind = vc4_dpi_unbind, 483 }; 484 485 static int vc4_dpi_dev_probe(struct platform_device *pdev) 486 { 487 return component_add(&pdev->dev, &vc4_dpi_ops); 488 } 489 490 static int vc4_dpi_dev_remove(struct platform_device *pdev) 491 { 492 component_del(&pdev->dev, &vc4_dpi_ops); 493 return 0; 494 } 495 496 struct platform_driver vc4_dpi_driver = { 497 .probe = vc4_dpi_dev_probe, 498 .remove = vc4_dpi_dev_remove, 499 .driver = { 500 .name = "vc4_dpi", 501 .of_match_table = vc4_dpi_dt_match, 502 }, 503 }; 504