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 *companion; 39 struct device *dev; 40 struct imx_sc_ipc *ipc_handle; 41 u32 sc_resource; 42 u32 in_bus_format; 43 u32 out_bus_format; 44 u32 pl_sel; 45 }; 46 47 #define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge) 48 49 static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge, 50 struct drm_encoder *encoder, 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(encoder, 62 p2d->bridge.next_bridge, bridge, 63 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 64 } 65 66 static void imx8qxp_pxl2dpi_bridge_destroy(struct drm_bridge *bridge) 67 { 68 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 69 70 if (!p2d) 71 return; 72 73 drm_bridge_put(p2d->companion); 74 } 75 76 static int 77 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge, 78 struct drm_bridge_state *bridge_state, 79 struct drm_crtc_state *crtc_state, 80 struct drm_connector_state *conn_state) 81 { 82 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 83 84 p2d->in_bus_format = bridge_state->input_bus_cfg.format; 85 p2d->out_bus_format = bridge_state->output_bus_cfg.format; 86 87 return 0; 88 } 89 90 static void 91 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge, 92 const struct drm_display_mode *mode, 93 const struct drm_display_mode *adjusted_mode) 94 { 95 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 96 struct imx8qxp_pxl2dpi *companion_p2d; 97 int ret; 98 99 ret = pm_runtime_get_sync(p2d->dev); 100 if (ret < 0) 101 DRM_DEV_ERROR(p2d->dev, 102 "failed to get runtime PM sync: %d\n", ret); 103 104 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource, 105 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel); 106 if (ret) 107 DRM_DEV_ERROR(p2d->dev, 108 "failed to set pixel link selection(%u): %d\n", 109 p2d->pl_sel, ret); 110 111 switch (p2d->out_bus_format) { 112 case MEDIA_BUS_FMT_RGB888_1X24: 113 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT); 114 break; 115 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 116 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT); 117 break; 118 default: 119 DRM_DEV_ERROR(p2d->dev, 120 "unsupported output bus format 0x%08x\n", 121 p2d->out_bus_format); 122 } 123 124 if (p2d->companion) { 125 companion_p2d = bridge_to_p2d(p2d->companion); 126 127 companion_p2d->in_bus_format = p2d->in_bus_format; 128 companion_p2d->out_bus_format = p2d->out_bus_format; 129 130 p2d->companion->funcs->mode_set(p2d->companion, mode, 131 adjusted_mode); 132 } 133 } 134 135 static void imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge, 136 struct drm_atomic_commit *state) 137 { 138 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; 139 140 pm_runtime_put(p2d->dev); 141 142 if (p2d->companion) 143 p2d->companion->funcs->atomic_disable(p2d->companion, state); 144 } 145 146 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = { 147 MEDIA_BUS_FMT_RGB888_1X24, 148 MEDIA_BUS_FMT_RGB666_1X24_CPADHI, 149 }; 150 151 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt) 152 { 153 int i; 154 155 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) { 156 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt) 157 return true; 158 } 159 160 return false; 161 } 162 163 static u32 * 164 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 165 struct drm_bridge_state *bridge_state, 166 struct drm_crtc_state *crtc_state, 167 struct drm_connector_state *conn_state, 168 u32 output_fmt, 169 unsigned int *num_input_fmts) 170 { 171 u32 *input_fmts; 172 173 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt)) 174 return NULL; 175 176 *num_input_fmts = 1; 177 178 input_fmts = kmalloc_obj(*input_fmts); 179 if (!input_fmts) 180 return NULL; 181 182 switch (output_fmt) { 183 case MEDIA_BUS_FMT_RGB888_1X24: 184 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO; 185 break; 186 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: 187 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO; 188 break; 189 default: 190 kfree(input_fmts); 191 input_fmts = NULL; 192 break; 193 } 194 195 return input_fmts; 196 } 197 198 static u32 * 199 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, 200 struct drm_bridge_state *bridge_state, 201 struct drm_crtc_state *crtc_state, 202 struct drm_connector_state *conn_state, 203 unsigned int *num_output_fmts) 204 { 205 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); 206 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts, 207 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL); 208 } 209 210 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = { 211 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 212 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 213 .atomic_reset = drm_atomic_helper_bridge_reset, 214 .attach = imx8qxp_pxl2dpi_bridge_attach, 215 .destroy = imx8qxp_pxl2dpi_bridge_destroy, 216 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check, 217 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set, 218 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable, 219 .atomic_get_input_bus_fmts = 220 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts, 221 .atomic_get_output_bus_fmts = 222 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts, 223 }; 224 225 static int 226 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d, 227 u32 port_id, 228 struct device_node **ep) 229 { 230 struct device_node *port; 231 int ret = 0; 232 int ep_cnt; 233 234 *ep = NULL; 235 236 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id); 237 if (!port) { 238 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id); 239 return -ENODEV; 240 } 241 242 ep_cnt = of_get_available_child_count(port); 243 if (ep_cnt == 0) { 244 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", 245 port_id); 246 ret = -ENODEV; 247 goto out; 248 } else if (ep_cnt > 1) { 249 DRM_DEV_ERROR(p2d->dev, 250 "invalid available endpoints of port@%u\n", 251 port_id); 252 ret = -EINVAL; 253 goto out; 254 } 255 256 *ep = of_get_next_available_child(port, NULL); 257 if (!*ep) { 258 DRM_DEV_ERROR(p2d->dev, 259 "failed to get available endpoint of port@%u\n", 260 port_id); 261 ret = -ENODEV; 262 goto out; 263 } 264 out: 265 of_node_put(port); 266 return ret; 267 } 268 269 static int imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d) 270 { 271 struct device_node *ep __free(device_node) = NULL; 272 int ret; 273 274 ret = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1, &ep); 275 if (ret) 276 return ret; 277 278 struct device_node *remote __free(device_node) = of_graph_get_remote_port_parent(ep); 279 if (!remote || !of_device_is_available(remote)) { 280 DRM_DEV_ERROR(p2d->dev, "no available remote\n"); 281 return -ENODEV; 282 } else if (!of_device_is_available(remote->parent)) { 283 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n"); 284 return -ENODEV; 285 } 286 287 p2d->bridge.next_bridge = of_drm_find_and_get_bridge(remote); 288 if (!p2d->bridge.next_bridge) 289 return -EPROBE_DEFER; 290 291 return 0; 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 ret = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0, &ep); 301 if (ret) 302 return ret; 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_and_get_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->bridge.next_bridge->of_node, 1); 368 port2 = of_graph_get_port_by_id(companion_p2d->bridge.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_drm_bridge_alloc(dev, struct imx8qxp_pxl2dpi, bridge, 396 &imx8qxp_pxl2dpi_bridge_funcs); 397 if (IS_ERR(p2d)) 398 return PTR_ERR(p2d); 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 ret = imx8qxp_pxl2dpi_find_next_bridge(p2d); 425 if (ret) 426 return ret; 427 428 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d); 429 if (ret) 430 return ret; 431 432 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d); 433 if (ret) 434 return ret; 435 436 platform_set_drvdata(pdev, p2d); 437 pm_runtime_enable(dev); 438 439 p2d->bridge.driver_private = p2d; 440 p2d->bridge.of_node = np; 441 442 drm_bridge_add(&p2d->bridge); 443 444 return ret; 445 } 446 447 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev) 448 { 449 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev); 450 451 drm_bridge_remove(&p2d->bridge); 452 453 pm_runtime_disable(&pdev->dev); 454 } 455 456 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = { 457 { .compatible = "fsl,imx8qxp-pxl2dpi", }, 458 { /* sentinel */ } 459 }; 460 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids); 461 462 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = { 463 .probe = imx8qxp_pxl2dpi_bridge_probe, 464 .remove = imx8qxp_pxl2dpi_bridge_remove, 465 .driver = { 466 .of_match_table = imx8qxp_pxl2dpi_dt_ids, 467 .name = DRIVER_NAME, 468 }, 469 }; 470 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver); 471 472 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver"); 473 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); 474 MODULE_LICENSE("GPL v2"); 475 MODULE_ALIAS("platform:" DRIVER_NAME); 476