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; 130 131 pm_runtime_put(p2d->dev); 132 133 if (p2d->companion) 134 p2d->companion->funcs->atomic_disable(p2d->companion, state); 135 } 136 137 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = { 138 MEDIA_BUS_FMT_RGB888_1X24, 139 MEDIA_BUS_FMT_RGB666_1X24_CPADHI, 140 }; 141 142 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt) 143 { 144 int i; 145 146 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) { 147 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt) 148 return true; 149 } 150 151 return false; 152 } 153 154 static u32 * 155 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 156 struct drm_bridge_state *bridge_state, 157 struct drm_crtc_state *crtc_state, 158 struct drm_connector_state *conn_state, 159 u32 output_fmt, 160 unsigned int *num_input_fmts) 161 { 162 u32 *input_fmts; 163 164 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt)) 165 return NULL; 166 167 *num_input_fmts = 1; 168 169 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); 170 if (!input_fmts) 171 return NULL; 172 173 switch (output_fmt) { 174 case MEDIA_BUS_FMT_RGB888_1X24: 175 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO; 176 break; 177 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 178 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO; 179 break; 180 default: 181 kfree(input_fmts); 182 input_fmts = NULL; 183 break; 184 } 185 186 return input_fmts; 187 } 188 189 static u32 * 190 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, 191 struct drm_bridge_state *bridge_state, 192 struct drm_crtc_state *crtc_state, 193 struct drm_connector_state *conn_state, 194 unsigned int *num_output_fmts) 195 { 196 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); 197 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts, 198 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL); 199 } 200 201 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = { 202 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 203 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 204 .atomic_reset = drm_atomic_helper_bridge_reset, 205 .attach = imx8qxp_pxl2dpi_bridge_attach, 206 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check, 207 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set, 208 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable, 209 .atomic_get_input_bus_fmts = 210 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts, 211 .atomic_get_output_bus_fmts = 212 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts, 213 }; 214 215 static struct device_node * 216 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d, 217 u32 port_id) 218 { 219 struct device_node *port, *ep; 220 int ep_cnt; 221 222 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id); 223 if (!port) { 224 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id); 225 return ERR_PTR(-ENODEV); 226 } 227 228 ep_cnt = of_get_available_child_count(port); 229 if (ep_cnt == 0) { 230 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", 231 port_id); 232 ep = ERR_PTR(-ENODEV); 233 goto out; 234 } else if (ep_cnt > 1) { 235 DRM_DEV_ERROR(p2d->dev, 236 "invalid available endpoints of port@%u\n", 237 port_id); 238 ep = ERR_PTR(-EINVAL); 239 goto out; 240 } 241 242 ep = of_get_next_available_child(port, NULL); 243 if (!ep) { 244 DRM_DEV_ERROR(p2d->dev, 245 "failed to get available endpoint of port@%u\n", 246 port_id); 247 ep = ERR_PTR(-ENODEV); 248 goto out; 249 } 250 out: 251 of_node_put(port); 252 return ep; 253 } 254 255 static struct drm_bridge * 256 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d) 257 { 258 struct device_node *ep, *remote; 259 struct drm_bridge *next_bridge; 260 int ret; 261 262 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1); 263 if (IS_ERR(ep)) { 264 ret = PTR_ERR(ep); 265 return ERR_PTR(ret); 266 } 267 268 remote = of_graph_get_remote_port_parent(ep); 269 if (!remote || !of_device_is_available(remote)) { 270 DRM_DEV_ERROR(p2d->dev, "no available remote\n"); 271 next_bridge = ERR_PTR(-ENODEV); 272 goto out; 273 } else if (!of_device_is_available(remote->parent)) { 274 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n"); 275 next_bridge = ERR_PTR(-ENODEV); 276 goto out; 277 } 278 279 next_bridge = of_drm_find_bridge(remote); 280 if (!next_bridge) { 281 next_bridge = ERR_PTR(-EPROBE_DEFER); 282 goto out; 283 } 284 out: 285 of_node_put(remote); 286 of_node_put(ep); 287 288 return next_bridge; 289 } 290 291 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d) 292 { 293 struct device_node *ep; 294 struct of_endpoint endpoint; 295 int ret; 296 297 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0); 298 if (IS_ERR(ep)) 299 return PTR_ERR(ep); 300 301 ret = of_graph_parse_endpoint(ep, &endpoint); 302 if (ret) { 303 DRM_DEV_ERROR(p2d->dev, 304 "failed to parse endpoint of port@0: %d\n", ret); 305 goto out; 306 } 307 308 p2d->pl_sel = endpoint.id; 309 out: 310 of_node_put(ep); 311 312 return ret; 313 } 314 315 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d) 316 { 317 struct imx8qxp_pxl2dpi *companion_p2d; 318 struct device *dev = p2d->dev; 319 struct device_node *companion; 320 struct device_node *port1, *port2; 321 const struct of_device_id *match; 322 int dual_link; 323 int ret = 0; 324 325 /* Locate the companion PXL2DPI for dual-link operation, if any. */ 326 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0); 327 if (!companion) 328 return 0; 329 330 if (!of_device_is_available(companion)) { 331 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n"); 332 ret = -ENODEV; 333 goto out; 334 } 335 336 /* 337 * Sanity check: the companion bridge must have the same compatible 338 * string. 339 */ 340 match = of_match_device(dev->driver->of_match_table, dev); 341 if (!of_device_is_compatible(companion, match->compatible)) { 342 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n"); 343 ret = -ENXIO; 344 goto out; 345 } 346 347 p2d->companion = of_drm_find_bridge(companion); 348 if (!p2d->companion) { 349 ret = -EPROBE_DEFER; 350 DRM_DEV_DEBUG_DRIVER(p2d->dev, 351 "failed to find companion bridge: %d\n", 352 ret); 353 goto out; 354 } 355 356 companion_p2d = bridge_to_p2d(p2d->companion); 357 358 /* 359 * We need to work out if the sink is expecting us to function in 360 * dual-link mode. We do this by looking at the DT port nodes that 361 * the next bridges are connected to. If they are marked as expecting 362 * even pixels and odd pixels than we need to use the companion PXL2DPI. 363 */ 364 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1); 365 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1); 366 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2); 367 of_node_put(port1); 368 of_node_put(port2); 369 370 if (dual_link < 0) { 371 ret = dual_link; 372 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", 373 ret); 374 goto out; 375 } 376 377 DRM_DEV_DEBUG_DRIVER(dev, 378 "dual-link configuration detected (companion bridge %pOF)\n", 379 companion); 380 out: 381 of_node_put(companion); 382 return ret; 383 } 384 385 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev) 386 { 387 struct imx8qxp_pxl2dpi *p2d; 388 struct device *dev = &pdev->dev; 389 struct device_node *np = dev->of_node; 390 int ret; 391 392 p2d = devm_drm_bridge_alloc(dev, struct imx8qxp_pxl2dpi, bridge, 393 &imx8qxp_pxl2dpi_bridge_funcs); 394 if (IS_ERR(p2d)) 395 return PTR_ERR(p2d); 396 397 p2d->regmap = syscon_node_to_regmap(np->parent); 398 if (IS_ERR(p2d->regmap)) { 399 ret = PTR_ERR(p2d->regmap); 400 if (ret != -EPROBE_DEFER) 401 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); 402 return ret; 403 } 404 405 ret = imx_scu_get_handle(&p2d->ipc_handle); 406 if (ret) { 407 if (ret != -EPROBE_DEFER) 408 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", 409 ret); 410 return ret; 411 } 412 413 p2d->dev = dev; 414 415 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource); 416 if (ret) { 417 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret); 418 return ret; 419 } 420 421 p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d); 422 if (IS_ERR(p2d->next_bridge)) { 423 ret = PTR_ERR(p2d->next_bridge); 424 if (ret != -EPROBE_DEFER) 425 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", 426 ret); 427 return ret; 428 } 429 430 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d); 431 if (ret) 432 return ret; 433 434 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d); 435 if (ret) 436 return ret; 437 438 platform_set_drvdata(pdev, p2d); 439 pm_runtime_enable(dev); 440 441 p2d->bridge.driver_private = p2d; 442 p2d->bridge.of_node = np; 443 444 drm_bridge_add(&p2d->bridge); 445 446 return ret; 447 } 448 449 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev) 450 { 451 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev); 452 453 drm_bridge_remove(&p2d->bridge); 454 455 pm_runtime_disable(&pdev->dev); 456 } 457 458 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = { 459 { .compatible = "fsl,imx8qxp-pxl2dpi", }, 460 { /* sentinel */ } 461 }; 462 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids); 463 464 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = { 465 .probe = imx8qxp_pxl2dpi_bridge_probe, 466 .remove = imx8qxp_pxl2dpi_bridge_remove, 467 .driver = { 468 .of_match_table = imx8qxp_pxl2dpi_dt_ids, 469 .name = DRIVER_NAME, 470 }, 471 }; 472 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver); 473 474 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver"); 475 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); 476 MODULE_LICENSE("GPL v2"); 477 MODULE_ALIAS("platform:" DRIVER_NAME); 478