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