1 // SPDX-License-Identifier: GPL-2.0+ 2 3 /* 4 * Copyright 2020,2022 NXP 5 */ 6 7 #include <linux/firmware/imx/svc/misc.h> 8 #include <linux/media-bus-format.h> 9 #include <linux/module.h> 10 #include <linux/of.h> 11 #include <linux/of_graph.h> 12 #include <linux/platform_device.h> 13 14 #include <drm/drm_atomic_state_helper.h> 15 #include <drm/drm_bridge.h> 16 #include <drm/drm_print.h> 17 18 #include <dt-bindings/firmware/imx/rsrc.h> 19 20 #define DRIVER_NAME "imx8qxp-display-pixel-link" 21 #define PL_MAX_MST_ADDR 3 22 #define PL_MAX_NEXT_BRIDGES 2 23 24 struct imx8qxp_pixel_link { 25 struct drm_bridge bridge; 26 struct drm_bridge *next_bridge; 27 struct device *dev; 28 struct imx_sc_ipc *ipc_handle; 29 u8 stream_id; 30 u8 dc_id; 31 u32 sink_rsc; 32 u32 mst_addr; 33 u8 mst_addr_ctrl; 34 u8 mst_en_ctrl; 35 u8 mst_vld_ctrl; 36 u8 sync_ctrl; 37 }; 38 39 static void imx8qxp_pixel_link_enable_mst_en(struct imx8qxp_pixel_link *pl) 40 { 41 int ret; 42 43 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc, 44 pl->mst_en_ctrl, true); 45 if (ret) 46 DRM_DEV_ERROR(pl->dev, 47 "failed to enable DC%u stream%u pixel link mst_en: %d\n", 48 pl->dc_id, pl->stream_id, ret); 49 } 50 51 static void imx8qxp_pixel_link_enable_mst_vld(struct imx8qxp_pixel_link *pl) 52 { 53 int ret; 54 55 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc, 56 pl->mst_vld_ctrl, true); 57 if (ret) 58 DRM_DEV_ERROR(pl->dev, 59 "failed to enable DC%u stream%u pixel link mst_vld: %d\n", 60 pl->dc_id, pl->stream_id, ret); 61 } 62 63 static void imx8qxp_pixel_link_enable_sync(struct imx8qxp_pixel_link *pl) 64 { 65 int ret; 66 67 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc, 68 pl->sync_ctrl, true); 69 if (ret) 70 DRM_DEV_ERROR(pl->dev, 71 "failed to enable DC%u stream%u pixel link sync: %d\n", 72 pl->dc_id, pl->stream_id, ret); 73 } 74 75 static int imx8qxp_pixel_link_disable_mst_en(struct imx8qxp_pixel_link *pl) 76 { 77 int ret; 78 79 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc, 80 pl->mst_en_ctrl, false); 81 if (ret) 82 DRM_DEV_ERROR(pl->dev, 83 "failed to disable DC%u stream%u pixel link mst_en: %d\n", 84 pl->dc_id, pl->stream_id, ret); 85 86 return ret; 87 } 88 89 static int imx8qxp_pixel_link_disable_mst_vld(struct imx8qxp_pixel_link *pl) 90 { 91 int ret; 92 93 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc, 94 pl->mst_vld_ctrl, false); 95 if (ret) 96 DRM_DEV_ERROR(pl->dev, 97 "failed to disable DC%u stream%u pixel link mst_vld: %d\n", 98 pl->dc_id, pl->stream_id, ret); 99 100 return ret; 101 } 102 103 static int imx8qxp_pixel_link_disable_sync(struct imx8qxp_pixel_link *pl) 104 { 105 int ret; 106 107 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc, 108 pl->sync_ctrl, false); 109 if (ret) 110 DRM_DEV_ERROR(pl->dev, 111 "failed to disable DC%u stream%u pixel link sync: %d\n", 112 pl->dc_id, pl->stream_id, ret); 113 114 return ret; 115 } 116 117 static void imx8qxp_pixel_link_set_mst_addr(struct imx8qxp_pixel_link *pl) 118 { 119 int ret; 120 121 ret = imx_sc_misc_set_control(pl->ipc_handle, 122 pl->sink_rsc, pl->mst_addr_ctrl, 123 pl->mst_addr); 124 if (ret) 125 DRM_DEV_ERROR(pl->dev, 126 "failed to set DC%u stream%u pixel link mst addr(%u): %d\n", 127 pl->dc_id, pl->stream_id, pl->mst_addr, ret); 128 } 129 130 static int imx8qxp_pixel_link_bridge_attach(struct drm_bridge *bridge, 131 enum drm_bridge_attach_flags flags) 132 { 133 struct imx8qxp_pixel_link *pl = bridge->driver_private; 134 135 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 136 DRM_DEV_ERROR(pl->dev, 137 "do not support creating a drm_connector\n"); 138 return -EINVAL; 139 } 140 141 if (!bridge->encoder) { 142 DRM_DEV_ERROR(pl->dev, "missing encoder\n"); 143 return -ENODEV; 144 } 145 146 return drm_bridge_attach(bridge->encoder, 147 pl->next_bridge, bridge, 148 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 149 } 150 151 static void 152 imx8qxp_pixel_link_bridge_mode_set(struct drm_bridge *bridge, 153 const struct drm_display_mode *mode, 154 const struct drm_display_mode *adjusted_mode) 155 { 156 struct imx8qxp_pixel_link *pl = bridge->driver_private; 157 158 imx8qxp_pixel_link_set_mst_addr(pl); 159 } 160 161 static void 162 imx8qxp_pixel_link_bridge_atomic_enable(struct drm_bridge *bridge, 163 struct drm_bridge_state *old_bridge_state) 164 { 165 struct imx8qxp_pixel_link *pl = bridge->driver_private; 166 167 imx8qxp_pixel_link_enable_mst_en(pl); 168 imx8qxp_pixel_link_enable_mst_vld(pl); 169 imx8qxp_pixel_link_enable_sync(pl); 170 } 171 172 static void 173 imx8qxp_pixel_link_bridge_atomic_disable(struct drm_bridge *bridge, 174 struct drm_bridge_state *old_bridge_state) 175 { 176 struct imx8qxp_pixel_link *pl = bridge->driver_private; 177 178 imx8qxp_pixel_link_disable_mst_en(pl); 179 imx8qxp_pixel_link_disable_mst_vld(pl); 180 imx8qxp_pixel_link_disable_sync(pl); 181 } 182 183 static const u32 imx8qxp_pixel_link_bus_output_fmts[] = { 184 MEDIA_BUS_FMT_RGB888_1X36_CPADLO, 185 MEDIA_BUS_FMT_RGB666_1X36_CPADLO, 186 }; 187 188 static bool imx8qxp_pixel_link_bus_output_fmt_supported(u32 fmt) 189 { 190 int i; 191 192 for (i = 0; i < ARRAY_SIZE(imx8qxp_pixel_link_bus_output_fmts); i++) { 193 if (imx8qxp_pixel_link_bus_output_fmts[i] == fmt) 194 return true; 195 } 196 197 return false; 198 } 199 200 static u32 * 201 imx8qxp_pixel_link_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 202 struct drm_bridge_state *bridge_state, 203 struct drm_crtc_state *crtc_state, 204 struct drm_connector_state *conn_state, 205 u32 output_fmt, 206 unsigned int *num_input_fmts) 207 { 208 u32 *input_fmts; 209 210 if (!imx8qxp_pixel_link_bus_output_fmt_supported(output_fmt)) 211 return NULL; 212 213 *num_input_fmts = 1; 214 215 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); 216 if (!input_fmts) 217 return NULL; 218 219 input_fmts[0] = output_fmt; 220 221 return input_fmts; 222 } 223 224 static u32 * 225 imx8qxp_pixel_link_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, 226 struct drm_bridge_state *bridge_state, 227 struct drm_crtc_state *crtc_state, 228 struct drm_connector_state *conn_state, 229 unsigned int *num_output_fmts) 230 { 231 *num_output_fmts = ARRAY_SIZE(imx8qxp_pixel_link_bus_output_fmts); 232 return kmemdup(imx8qxp_pixel_link_bus_output_fmts, 233 sizeof(imx8qxp_pixel_link_bus_output_fmts), GFP_KERNEL); 234 } 235 236 static const struct drm_bridge_funcs imx8qxp_pixel_link_bridge_funcs = { 237 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 238 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 239 .atomic_reset = drm_atomic_helper_bridge_reset, 240 .attach = imx8qxp_pixel_link_bridge_attach, 241 .mode_set = imx8qxp_pixel_link_bridge_mode_set, 242 .atomic_enable = imx8qxp_pixel_link_bridge_atomic_enable, 243 .atomic_disable = imx8qxp_pixel_link_bridge_atomic_disable, 244 .atomic_get_input_bus_fmts = 245 imx8qxp_pixel_link_bridge_atomic_get_input_bus_fmts, 246 .atomic_get_output_bus_fmts = 247 imx8qxp_pixel_link_bridge_atomic_get_output_bus_fmts, 248 }; 249 250 static int imx8qxp_pixel_link_disable_all_controls(struct imx8qxp_pixel_link *pl) 251 { 252 int ret; 253 254 ret = imx8qxp_pixel_link_disable_mst_en(pl); 255 if (ret) 256 return ret; 257 258 ret = imx8qxp_pixel_link_disable_mst_vld(pl); 259 if (ret) 260 return ret; 261 262 return imx8qxp_pixel_link_disable_sync(pl); 263 } 264 265 static struct drm_bridge * 266 imx8qxp_pixel_link_find_next_bridge(struct imx8qxp_pixel_link *pl) 267 { 268 struct device_node *np = pl->dev->of_node; 269 struct device_node *port, *remote; 270 struct drm_bridge *next_bridge[PL_MAX_NEXT_BRIDGES]; 271 u32 port_id; 272 bool found_port = false; 273 int reg, ep_cnt = 0; 274 /* select the first next bridge by default */ 275 int bridge_sel = 0; 276 277 for (port_id = 1; port_id <= PL_MAX_MST_ADDR + 1; port_id++) { 278 port = of_graph_get_port_by_id(np, port_id); 279 if (!port) 280 continue; 281 282 if (of_device_is_available(port)) { 283 found_port = true; 284 of_node_put(port); 285 break; 286 } 287 288 of_node_put(port); 289 } 290 291 if (!found_port) { 292 DRM_DEV_ERROR(pl->dev, "no available output port\n"); 293 return ERR_PTR(-ENODEV); 294 } 295 296 for (reg = 0; reg < PL_MAX_NEXT_BRIDGES; reg++) { 297 remote = of_graph_get_remote_node(np, port_id, reg); 298 if (!remote) 299 continue; 300 301 if (!of_device_is_available(remote->parent)) { 302 DRM_DEV_DEBUG(pl->dev, 303 "port%u endpoint%u remote parent is not available\n", 304 port_id, reg); 305 of_node_put(remote); 306 continue; 307 } 308 309 next_bridge[ep_cnt] = of_drm_find_bridge(remote); 310 if (!next_bridge[ep_cnt]) { 311 of_node_put(remote); 312 return ERR_PTR(-EPROBE_DEFER); 313 } 314 315 /* specially select the next bridge with companion PXL2DPI */ 316 if (of_property_present(remote, "fsl,companion-pxl2dpi")) 317 bridge_sel = ep_cnt; 318 319 ep_cnt++; 320 321 of_node_put(remote); 322 } 323 324 pl->mst_addr = port_id - 1; 325 326 return next_bridge[bridge_sel]; 327 } 328 329 static int imx8qxp_pixel_link_bridge_probe(struct platform_device *pdev) 330 { 331 struct imx8qxp_pixel_link *pl; 332 struct device *dev = &pdev->dev; 333 struct device_node *np = dev->of_node; 334 int ret; 335 336 pl = devm_kzalloc(dev, sizeof(*pl), GFP_KERNEL); 337 if (!pl) 338 return -ENOMEM; 339 340 ret = imx_scu_get_handle(&pl->ipc_handle); 341 if (ret) { 342 if (ret != -EPROBE_DEFER) 343 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", 344 ret); 345 return ret; 346 } 347 348 ret = of_property_read_u8(np, "fsl,dc-id", &pl->dc_id); 349 if (ret) { 350 DRM_DEV_ERROR(dev, "failed to get DC index: %d\n", ret); 351 return ret; 352 } 353 354 ret = of_property_read_u8(np, "fsl,dc-stream-id", &pl->stream_id); 355 if (ret) { 356 DRM_DEV_ERROR(dev, "failed to get DC stream index: %d\n", ret); 357 return ret; 358 } 359 360 pl->dev = dev; 361 362 pl->sink_rsc = pl->dc_id ? IMX_SC_R_DC_1 : IMX_SC_R_DC_0; 363 364 if (pl->stream_id == 0) { 365 pl->mst_addr_ctrl = IMX_SC_C_PXL_LINK_MST1_ADDR; 366 pl->mst_en_ctrl = IMX_SC_C_PXL_LINK_MST1_ENB; 367 pl->mst_vld_ctrl = IMX_SC_C_PXL_LINK_MST1_VLD; 368 pl->sync_ctrl = IMX_SC_C_SYNC_CTRL0; 369 } else { 370 pl->mst_addr_ctrl = IMX_SC_C_PXL_LINK_MST2_ADDR; 371 pl->mst_en_ctrl = IMX_SC_C_PXL_LINK_MST2_ENB; 372 pl->mst_vld_ctrl = IMX_SC_C_PXL_LINK_MST2_VLD; 373 pl->sync_ctrl = IMX_SC_C_SYNC_CTRL1; 374 } 375 376 /* disable all controls to POR default */ 377 ret = imx8qxp_pixel_link_disable_all_controls(pl); 378 if (ret) 379 return ret; 380 381 pl->next_bridge = imx8qxp_pixel_link_find_next_bridge(pl); 382 if (IS_ERR(pl->next_bridge)) { 383 ret = PTR_ERR(pl->next_bridge); 384 if (ret != -EPROBE_DEFER) 385 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", 386 ret); 387 return ret; 388 } 389 390 platform_set_drvdata(pdev, pl); 391 392 pl->bridge.driver_private = pl; 393 pl->bridge.funcs = &imx8qxp_pixel_link_bridge_funcs; 394 pl->bridge.of_node = np; 395 396 drm_bridge_add(&pl->bridge); 397 398 return ret; 399 } 400 401 static void imx8qxp_pixel_link_bridge_remove(struct platform_device *pdev) 402 { 403 struct imx8qxp_pixel_link *pl = platform_get_drvdata(pdev); 404 405 drm_bridge_remove(&pl->bridge); 406 } 407 408 static const struct of_device_id imx8qxp_pixel_link_dt_ids[] = { 409 { .compatible = "fsl,imx8qm-dc-pixel-link", }, 410 { .compatible = "fsl,imx8qxp-dc-pixel-link", }, 411 { /* sentinel */ } 412 }; 413 MODULE_DEVICE_TABLE(of, imx8qxp_pixel_link_dt_ids); 414 415 static struct platform_driver imx8qxp_pixel_link_bridge_driver = { 416 .probe = imx8qxp_pixel_link_bridge_probe, 417 .remove_new = imx8qxp_pixel_link_bridge_remove, 418 .driver = { 419 .of_match_table = imx8qxp_pixel_link_dt_ids, 420 .name = DRIVER_NAME, 421 }, 422 }; 423 module_platform_driver(imx8qxp_pixel_link_bridge_driver); 424 425 MODULE_DESCRIPTION("i.MX8QXP/QM display pixel link bridge driver"); 426 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); 427 MODULE_LICENSE("GPL v2"); 428 MODULE_ALIAS("platform:" DRIVER_NAME); 429