1 // SPDX-License-Identifier: GPL-2.0+ 2 3 /* 4 * Copyright 2020 NXP 5 */ 6 7 #include <linux/firmware/imx/svc/misc.h> 8 #include <linux/media-bus-format.h> 9 #include <linux/mfd/syscon.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/of_device.h> 13 #include <linux/of_graph.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/regmap.h> 17 18 #include <drm/drm_atomic_state_helper.h> 19 #include <drm/drm_bridge.h> 20 #include <drm/drm_of.h> 21 #include <drm/drm_print.h> 22 23 #include <dt-bindings/firmware/imx/rsrc.h> 24 25 #define PXL2DPI_CTRL 0x40 26 #define CFG1_16BIT 0x0 27 #define CFG2_16BIT 0x1 28 #define CFG3_16BIT 0x2 29 #define CFG1_18BIT 0x3 30 #define CFG2_18BIT 0x4 31 #define CFG_24BIT 0x5 32 33 #define DRIVER_NAME "imx8qxp-pxl2dpi" 34 35 struct imx8qxp_pxl2dpi { 36 struct regmap *regmap; 37 struct drm_bridge bridge; 38 struct drm_bridge *next_bridge; 39 struct drm_bridge *companion; 40 struct device *dev; 41 struct imx_sc_ipc *ipc_handle; 42 u32 sc_resource; 43 u32 in_bus_format; 44 u32 out_bus_format; 45 u32 pl_sel; 46 }; 47 48 #define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge) 49 50 static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge, 51 enum drm_bridge_attach_flags flags) 52 { 53 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 54 55 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 56 DRM_DEV_ERROR(p2d->dev, 57 "do not support creating a drm_connector\n"); 58 return -EINVAL; 59 } 60 61 return drm_bridge_attach(bridge->encoder, 62 p2d->next_bridge, bridge, 63 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 64 } 65 66 static int 67 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge, 68 struct drm_bridge_state *bridge_state, 69 struct drm_crtc_state *crtc_state, 70 struct drm_connector_state *conn_state) 71 { 72 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 73 74 p2d->in_bus_format = bridge_state->input_bus_cfg.format; 75 p2d->out_bus_format = bridge_state->output_bus_cfg.format; 76 77 return 0; 78 } 79 80 static void 81 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge, 82 const struct drm_display_mode *mode, 83 const struct drm_display_mode *adjusted_mode) 84 { 85 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 86 struct imx8qxp_pxl2dpi *companion_p2d; 87 int ret; 88 89 ret = pm_runtime_get_sync(p2d->dev); 90 if (ret < 0) 91 DRM_DEV_ERROR(p2d->dev, 92 "failed to get runtime PM sync: %d\n", ret); 93 94 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource, 95 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel); 96 if (ret) 97 DRM_DEV_ERROR(p2d->dev, 98 "failed to set pixel link selection(%u): %d\n", 99 p2d->pl_sel, ret); 100 101 switch (p2d->out_bus_format) { 102 case MEDIA_BUS_FMT_RGB888_1X24: 103 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT); 104 break; 105 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 106 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT); 107 break; 108 default: 109 DRM_DEV_ERROR(p2d->dev, 110 "unsupported output bus format 0x%08x\n", 111 p2d->out_bus_format); 112 } 113 114 if (p2d->companion) { 115 companion_p2d = bridge_to_p2d(p2d->companion); 116 117 companion_p2d->in_bus_format = p2d->in_bus_format; 118 companion_p2d->out_bus_format = p2d->out_bus_format; 119 120 p2d->companion->funcs->mode_set(p2d->companion, mode, 121 adjusted_mode); 122 } 123 } 124 125 static void 126 imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge, 127 struct drm_bridge_state *old_bridge_state) 128 { 129 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 130 int ret; 131 132 ret = pm_runtime_put(p2d->dev); 133 if (ret < 0) 134 DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret); 135 136 if (p2d->companion) 137 p2d->companion->funcs->atomic_disable(p2d->companion, 138 old_bridge_state); 139 } 140 141 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = { 142 MEDIA_BUS_FMT_RGB888_1X24, 143 MEDIA_BUS_FMT_RGB666_1X24_CPADHI, 144 }; 145 146 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt) 147 { 148 int i; 149 150 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) { 151 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt) 152 return true; 153 } 154 155 return false; 156 } 157 158 static u32 * 159 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 160 struct drm_bridge_state *bridge_state, 161 struct drm_crtc_state *crtc_state, 162 struct drm_connector_state *conn_state, 163 u32 output_fmt, 164 unsigned int *num_input_fmts) 165 { 166 u32 *input_fmts; 167 168 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt)) 169 return NULL; 170 171 *num_input_fmts = 1; 172 173 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); 174 if (!input_fmts) 175 return NULL; 176 177 switch (output_fmt) { 178 case MEDIA_BUS_FMT_RGB888_1X24: 179 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO; 180 break; 181 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 182 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO; 183 break; 184 default: 185 kfree(input_fmts); 186 input_fmts = NULL; 187 break; 188 } 189 190 return input_fmts; 191 } 192 193 static u32 * 194 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, 195 struct drm_bridge_state *bridge_state, 196 struct drm_crtc_state *crtc_state, 197 struct drm_connector_state *conn_state, 198 unsigned int *num_output_fmts) 199 { 200 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); 201 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts, 202 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL); 203 } 204 205 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = { 206 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 207 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 208 .atomic_reset = drm_atomic_helper_bridge_reset, 209 .attach = imx8qxp_pxl2dpi_bridge_attach, 210 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check, 211 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set, 212 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable, 213 .atomic_get_input_bus_fmts = 214 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts, 215 .atomic_get_output_bus_fmts = 216 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts, 217 }; 218 219 static struct device_node * 220 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d, 221 u32 port_id) 222 { 223 struct device_node *port, *ep; 224 int ep_cnt; 225 226 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id); 227 if (!port) { 228 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id); 229 return ERR_PTR(-ENODEV); 230 } 231 232 ep_cnt = of_get_available_child_count(port); 233 if (ep_cnt == 0) { 234 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", 235 port_id); 236 ep = ERR_PTR(-ENODEV); 237 goto out; 238 } else if (ep_cnt > 1) { 239 DRM_DEV_ERROR(p2d->dev, 240 "invalid available endpoints of port@%u\n", 241 port_id); 242 ep = ERR_PTR(-EINVAL); 243 goto out; 244 } 245 246 ep = of_get_next_available_child(port, NULL); 247 if (!ep) { 248 DRM_DEV_ERROR(p2d->dev, 249 "failed to get available endpoint of port@%u\n", 250 port_id); 251 ep = ERR_PTR(-ENODEV); 252 goto out; 253 } 254 out: 255 of_node_put(port); 256 return ep; 257 } 258 259 static struct drm_bridge * 260 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d) 261 { 262 struct device_node *ep, *remote; 263 struct drm_bridge *next_bridge; 264 int ret; 265 266 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1); 267 if (IS_ERR(ep)) { 268 ret = PTR_ERR(ep); 269 return ERR_PTR(ret); 270 } 271 272 remote = of_graph_get_remote_port_parent(ep); 273 if (!remote || !of_device_is_available(remote)) { 274 DRM_DEV_ERROR(p2d->dev, "no available remote\n"); 275 next_bridge = ERR_PTR(-ENODEV); 276 goto out; 277 } else if (!of_device_is_available(remote->parent)) { 278 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n"); 279 next_bridge = ERR_PTR(-ENODEV); 280 goto out; 281 } 282 283 next_bridge = of_drm_find_bridge(remote); 284 if (!next_bridge) { 285 next_bridge = ERR_PTR(-EPROBE_DEFER); 286 goto out; 287 } 288 out: 289 of_node_put(remote); 290 of_node_put(ep); 291 292 return next_bridge; 293 } 294 295 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d) 296 { 297 struct device_node *ep; 298 struct of_endpoint endpoint; 299 int ret; 300 301 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0); 302 if (IS_ERR(ep)) 303 return PTR_ERR(ep); 304 305 ret = of_graph_parse_endpoint(ep, &endpoint); 306 if (ret) { 307 DRM_DEV_ERROR(p2d->dev, 308 "failed to parse endpoint of port@0: %d\n", ret); 309 goto out; 310 } 311 312 p2d->pl_sel = endpoint.id; 313 out: 314 of_node_put(ep); 315 316 return ret; 317 } 318 319 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d) 320 { 321 struct imx8qxp_pxl2dpi *companion_p2d; 322 struct device *dev = p2d->dev; 323 struct device_node *companion; 324 struct device_node *port1, *port2; 325 const struct of_device_id *match; 326 int dual_link; 327 int ret = 0; 328 329 /* Locate the companion PXL2DPI for dual-link operation, if any. */ 330 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0); 331 if (!companion) 332 return 0; 333 334 if (!of_device_is_available(companion)) { 335 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n"); 336 ret = -ENODEV; 337 goto out; 338 } 339 340 /* 341 * Sanity check: the companion bridge must have the same compatible 342 * string. 343 */ 344 match = of_match_device(dev->driver->of_match_table, dev); 345 if (!of_device_is_compatible(companion, match->compatible)) { 346 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n"); 347 ret = -ENXIO; 348 goto out; 349 } 350 351 p2d->companion = of_drm_find_bridge(companion); 352 if (!p2d->companion) { 353 ret = -EPROBE_DEFER; 354 DRM_DEV_DEBUG_DRIVER(p2d->dev, 355 "failed to find companion bridge: %d\n", 356 ret); 357 goto out; 358 } 359 360 companion_p2d = bridge_to_p2d(p2d->companion); 361 362 /* 363 * We need to work out if the sink is expecting us to function in 364 * dual-link mode. We do this by looking at the DT port nodes that 365 * the next bridges are connected to. If they are marked as expecting 366 * even pixels and odd pixels than we need to use the companion PXL2DPI. 367 */ 368 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1); 369 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1); 370 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2); 371 of_node_put(port1); 372 of_node_put(port2); 373 374 if (dual_link < 0) { 375 ret = dual_link; 376 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", 377 ret); 378 goto out; 379 } 380 381 DRM_DEV_DEBUG_DRIVER(dev, 382 "dual-link configuration detected (companion bridge %pOF)\n", 383 companion); 384 out: 385 of_node_put(companion); 386 return ret; 387 } 388 389 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev) 390 { 391 struct imx8qxp_pxl2dpi *p2d; 392 struct device *dev = &pdev->dev; 393 struct device_node *np = dev->of_node; 394 int ret; 395 396 p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL); 397 if (!p2d) 398 return -ENOMEM; 399 400 p2d->regmap = syscon_node_to_regmap(np->parent); 401 if (IS_ERR(p2d->regmap)) { 402 ret = PTR_ERR(p2d->regmap); 403 if (ret != -EPROBE_DEFER) 404 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); 405 return ret; 406 } 407 408 ret = imx_scu_get_handle(&p2d->ipc_handle); 409 if (ret) { 410 if (ret != -EPROBE_DEFER) 411 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", 412 ret); 413 return ret; 414 } 415 416 p2d->dev = dev; 417 418 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource); 419 if (ret) { 420 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret); 421 return ret; 422 } 423 424 p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d); 425 if (IS_ERR(p2d->next_bridge)) { 426 ret = PTR_ERR(p2d->next_bridge); 427 if (ret != -EPROBE_DEFER) 428 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", 429 ret); 430 return ret; 431 } 432 433 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d); 434 if (ret) 435 return ret; 436 437 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d); 438 if (ret) 439 return ret; 440 441 platform_set_drvdata(pdev, p2d); 442 pm_runtime_enable(dev); 443 444 p2d->bridge.driver_private = p2d; 445 p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs; 446 p2d->bridge.of_node = np; 447 448 drm_bridge_add(&p2d->bridge); 449 450 return ret; 451 } 452 453 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev) 454 { 455 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev); 456 457 drm_bridge_remove(&p2d->bridge); 458 459 pm_runtime_disable(&pdev->dev); 460 } 461 462 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = { 463 { .compatible = "fsl,imx8qxp-pxl2dpi", }, 464 { /* sentinel */ } 465 }; 466 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids); 467 468 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = { 469 .probe = imx8qxp_pxl2dpi_bridge_probe, 470 .remove_new = imx8qxp_pxl2dpi_bridge_remove, 471 .driver = { 472 .of_match_table = imx8qxp_pxl2dpi_dt_ids, 473 .name = DRIVER_NAME, 474 }, 475 }; 476 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver); 477 478 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver"); 479 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); 480 MODULE_LICENSE("GPL v2"); 481 MODULE_ALIAS("platform:" DRIVER_NAME); 482