1 // SPDX-License-Identifier: GPL-2.0+ 2 3 /* 4 * Copyright 2020 NXP 5 */ 6 7 #include <linux/bitfield.h> 8 #include <linux/clk.h> 9 #include <linux/delay.h> 10 #include <linux/io.h> 11 #include <linux/media-bus-format.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/of_graph.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 18 #include <drm/drm_atomic_state_helper.h> 19 #include <drm/drm_bridge.h> 20 #include <drm/drm_print.h> 21 22 #define PC_CTRL_REG 0x0 23 #define PC_COMBINE_ENABLE BIT(0) 24 #define PC_DISP_BYPASS(n) BIT(1 + 21 * (n)) 25 #define PC_DISP_HSYNC_POLARITY(n) BIT(2 + 11 * (n)) 26 #define PC_DISP_HSYNC_POLARITY_POS(n) DISP_HSYNC_POLARITY(n) 27 #define PC_DISP_VSYNC_POLARITY(n) BIT(3 + 11 * (n)) 28 #define PC_DISP_VSYNC_POLARITY_POS(n) DISP_VSYNC_POLARITY(n) 29 #define PC_DISP_DVALID_POLARITY(n) BIT(4 + 11 * (n)) 30 #define PC_DISP_DVALID_POLARITY_POS(n) DISP_DVALID_POLARITY(n) 31 #define PC_VSYNC_MASK_ENABLE BIT(5) 32 #define PC_SKIP_MODE BIT(6) 33 #define PC_SKIP_NUMBER_MASK GENMASK(12, 7) 34 #define PC_SKIP_NUMBER(n) FIELD_PREP(PC_SKIP_NUMBER_MASK, (n)) 35 #define PC_DISP0_PIX_DATA_FORMAT_MASK GENMASK(18, 16) 36 #define PC_DISP0_PIX_DATA_FORMAT(fmt) \ 37 FIELD_PREP(PC_DISP0_PIX_DATA_FORMAT_MASK, (fmt)) 38 #define PC_DISP1_PIX_DATA_FORMAT_MASK GENMASK(21, 19) 39 #define PC_DISP1_PIX_DATA_FORMAT(fmt) \ 40 FIELD_PREP(PC_DISP1_PIX_DATA_FORMAT_MASK, (fmt)) 41 42 #define PC_SW_RESET_REG 0x20 43 #define PC_SW_RESET_N BIT(0) 44 #define PC_DISP_SW_RESET_N(n) BIT(1 + (n)) 45 #define PC_FULL_RESET_N (PC_SW_RESET_N | \ 46 PC_DISP_SW_RESET_N(0) | \ 47 PC_DISP_SW_RESET_N(1)) 48 49 #define PC_REG_SET 0x4 50 #define PC_REG_CLR 0x8 51 52 #define DRIVER_NAME "imx8qxp-pixel-combiner" 53 54 enum imx8qxp_pc_pix_data_format { 55 RGB, 56 YUV444, 57 YUV422, 58 SPLIT_RGB, 59 }; 60 61 struct imx8qxp_pc_channel { 62 struct drm_bridge bridge; 63 struct drm_bridge *next_bridge; 64 struct imx8qxp_pc *pc; 65 unsigned int stream_id; 66 bool is_available; 67 }; 68 69 struct imx8qxp_pc { 70 struct device *dev; 71 struct imx8qxp_pc_channel ch[2]; 72 struct clk *clk_apb; 73 void __iomem *base; 74 }; 75 76 static inline u32 imx8qxp_pc_read(struct imx8qxp_pc *pc, unsigned int offset) 77 { 78 return readl(pc->base + offset); 79 } 80 81 static inline void 82 imx8qxp_pc_write(struct imx8qxp_pc *pc, unsigned int offset, u32 value) 83 { 84 writel(value, pc->base + offset); 85 } 86 87 static inline void 88 imx8qxp_pc_write_set(struct imx8qxp_pc *pc, unsigned int offset, u32 value) 89 { 90 imx8qxp_pc_write(pc, offset + PC_REG_SET, value); 91 } 92 93 static inline void 94 imx8qxp_pc_write_clr(struct imx8qxp_pc *pc, unsigned int offset, u32 value) 95 { 96 imx8qxp_pc_write(pc, offset + PC_REG_CLR, value); 97 } 98 99 static enum drm_mode_status 100 imx8qxp_pc_bridge_mode_valid(struct drm_bridge *bridge, 101 const struct drm_display_info *info, 102 const struct drm_display_mode *mode) 103 { 104 if (mode->hdisplay > 2560) 105 return MODE_BAD_HVALUE; 106 107 return MODE_OK; 108 } 109 110 static int imx8qxp_pc_bridge_attach(struct drm_bridge *bridge, 111 enum drm_bridge_attach_flags flags) 112 { 113 struct imx8qxp_pc_channel *ch = bridge->driver_private; 114 struct imx8qxp_pc *pc = ch->pc; 115 116 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 117 DRM_DEV_ERROR(pc->dev, 118 "do not support creating a drm_connector\n"); 119 return -EINVAL; 120 } 121 122 return drm_bridge_attach(bridge->encoder, 123 ch->next_bridge, bridge, 124 DRM_BRIDGE_ATTACH_NO_CONNECTOR); 125 } 126 127 static void 128 imx8qxp_pc_bridge_mode_set(struct drm_bridge *bridge, 129 const struct drm_display_mode *mode, 130 const struct drm_display_mode *adjusted_mode) 131 { 132 struct imx8qxp_pc_channel *ch = bridge->driver_private; 133 struct imx8qxp_pc *pc = ch->pc; 134 u32 val; 135 int ret; 136 137 ret = pm_runtime_get_sync(pc->dev); 138 if (ret < 0) 139 DRM_DEV_ERROR(pc->dev, 140 "failed to get runtime PM sync: %d\n", ret); 141 142 ret = clk_prepare_enable(pc->clk_apb); 143 if (ret) 144 DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n", 145 __func__, ret); 146 147 /* HSYNC to pixel link is active low. */ 148 imx8qxp_pc_write_clr(pc, PC_CTRL_REG, 149 PC_DISP_HSYNC_POLARITY(ch->stream_id)); 150 151 /* VSYNC to pixel link is active low. */ 152 imx8qxp_pc_write_clr(pc, PC_CTRL_REG, 153 PC_DISP_VSYNC_POLARITY(ch->stream_id)); 154 155 /* Data enable to pixel link is active high. */ 156 imx8qxp_pc_write_set(pc, PC_CTRL_REG, 157 PC_DISP_DVALID_POLARITY(ch->stream_id)); 158 159 /* Mask the first frame output which may be incomplete. */ 160 imx8qxp_pc_write_set(pc, PC_CTRL_REG, PC_VSYNC_MASK_ENABLE); 161 162 /* Only support RGB currently. */ 163 val = imx8qxp_pc_read(pc, PC_CTRL_REG); 164 if (ch->stream_id == 0) { 165 val &= ~PC_DISP0_PIX_DATA_FORMAT_MASK; 166 val |= PC_DISP0_PIX_DATA_FORMAT(RGB); 167 } else { 168 val &= ~PC_DISP1_PIX_DATA_FORMAT_MASK; 169 val |= PC_DISP1_PIX_DATA_FORMAT(RGB); 170 } 171 imx8qxp_pc_write(pc, PC_CTRL_REG, val); 172 173 /* Only support bypass mode currently. */ 174 imx8qxp_pc_write_set(pc, PC_CTRL_REG, PC_DISP_BYPASS(ch->stream_id)); 175 176 clk_disable_unprepare(pc->clk_apb); 177 } 178 179 static void imx8qxp_pc_bridge_atomic_disable(struct drm_bridge *bridge, 180 struct drm_atomic_state *state) 181 { 182 struct imx8qxp_pc_channel *ch = bridge->driver_private; 183 struct imx8qxp_pc *pc = ch->pc; 184 int ret; 185 186 ret = pm_runtime_put(pc->dev); 187 if (ret < 0) 188 DRM_DEV_ERROR(pc->dev, "failed to put runtime PM: %d\n", ret); 189 } 190 191 static const u32 imx8qxp_pc_bus_output_fmts[] = { 192 MEDIA_BUS_FMT_RGB888_1X36_CPADLO, 193 MEDIA_BUS_FMT_RGB666_1X36_CPADLO, 194 }; 195 196 static bool imx8qxp_pc_bus_output_fmt_supported(u32 fmt) 197 { 198 int i; 199 200 for (i = 0; i < ARRAY_SIZE(imx8qxp_pc_bus_output_fmts); i++) { 201 if (imx8qxp_pc_bus_output_fmts[i] == fmt) 202 return true; 203 } 204 205 return false; 206 } 207 208 static u32 * 209 imx8qxp_pc_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 210 struct drm_bridge_state *bridge_state, 211 struct drm_crtc_state *crtc_state, 212 struct drm_connector_state *conn_state, 213 u32 output_fmt, 214 unsigned int *num_input_fmts) 215 { 216 u32 *input_fmts; 217 218 if (!imx8qxp_pc_bus_output_fmt_supported(output_fmt)) 219 return NULL; 220 221 *num_input_fmts = 1; 222 223 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); 224 if (!input_fmts) 225 return NULL; 226 227 switch (output_fmt) { 228 case MEDIA_BUS_FMT_RGB888_1X36_CPADLO: 229 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X30_CPADLO; 230 break; 231 case MEDIA_BUS_FMT_RGB666_1X36_CPADLO: 232 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X30_CPADLO; 233 break; 234 default: 235 kfree(input_fmts); 236 input_fmts = NULL; 237 break; 238 } 239 240 return input_fmts; 241 } 242 243 static u32 * 244 imx8qxp_pc_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, 245 struct drm_bridge_state *bridge_state, 246 struct drm_crtc_state *crtc_state, 247 struct drm_connector_state *conn_state, 248 unsigned int *num_output_fmts) 249 { 250 *num_output_fmts = ARRAY_SIZE(imx8qxp_pc_bus_output_fmts); 251 return kmemdup(imx8qxp_pc_bus_output_fmts, 252 sizeof(imx8qxp_pc_bus_output_fmts), GFP_KERNEL); 253 } 254 255 static const struct drm_bridge_funcs imx8qxp_pc_bridge_funcs = { 256 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 257 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 258 .atomic_reset = drm_atomic_helper_bridge_reset, 259 .mode_valid = imx8qxp_pc_bridge_mode_valid, 260 .attach = imx8qxp_pc_bridge_attach, 261 .mode_set = imx8qxp_pc_bridge_mode_set, 262 .atomic_disable = imx8qxp_pc_bridge_atomic_disable, 263 .atomic_get_input_bus_fmts = 264 imx8qxp_pc_bridge_atomic_get_input_bus_fmts, 265 .atomic_get_output_bus_fmts = 266 imx8qxp_pc_bridge_atomic_get_output_bus_fmts, 267 }; 268 269 static int imx8qxp_pc_bridge_probe(struct platform_device *pdev) 270 { 271 struct imx8qxp_pc *pc; 272 struct imx8qxp_pc_channel *ch; 273 struct device *dev = &pdev->dev; 274 struct device_node *np = dev->of_node; 275 struct device_node *child, *remote; 276 u32 i; 277 int ret; 278 279 pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); 280 if (!pc) 281 return -ENOMEM; 282 283 pc->base = devm_platform_ioremap_resource(pdev, 0); 284 if (IS_ERR(pc->base)) 285 return PTR_ERR(pc->base); 286 287 pc->dev = dev; 288 289 pc->clk_apb = devm_clk_get(dev, "apb"); 290 if (IS_ERR(pc->clk_apb)) { 291 ret = PTR_ERR(pc->clk_apb); 292 if (ret != -EPROBE_DEFER) 293 DRM_DEV_ERROR(dev, "failed to get apb clock: %d\n", ret); 294 return ret; 295 } 296 297 platform_set_drvdata(pdev, pc); 298 pm_runtime_enable(dev); 299 300 for_each_available_child_of_node(np, child) { 301 ret = of_property_read_u32(child, "reg", &i); 302 if (ret || i > 1) { 303 ret = -EINVAL; 304 DRM_DEV_ERROR(dev, 305 "invalid channel(%u) node address\n", i); 306 goto free_child; 307 } 308 309 ch = &pc->ch[i]; 310 ch->pc = pc; 311 ch->stream_id = i; 312 313 remote = of_graph_get_remote_node(child, 1, 0); 314 if (!remote) { 315 ret = -ENODEV; 316 DRM_DEV_ERROR(dev, 317 "channel%u failed to get port1's remote node: %d\n", 318 i, ret); 319 goto free_child; 320 } 321 322 ch->next_bridge = of_drm_find_bridge(remote); 323 if (!ch->next_bridge) { 324 of_node_put(remote); 325 ret = -EPROBE_DEFER; 326 DRM_DEV_DEBUG_DRIVER(dev, 327 "channel%u failed to find next bridge: %d\n", 328 i, ret); 329 goto free_child; 330 } 331 332 of_node_put(remote); 333 334 ch->bridge.driver_private = ch; 335 ch->bridge.funcs = &imx8qxp_pc_bridge_funcs; 336 ch->bridge.of_node = child; 337 ch->is_available = true; 338 339 drm_bridge_add(&ch->bridge); 340 } 341 342 return 0; 343 344 free_child: 345 of_node_put(child); 346 347 if (i == 1 && pc->ch[0].next_bridge) 348 drm_bridge_remove(&pc->ch[0].bridge); 349 350 pm_runtime_disable(dev); 351 return ret; 352 } 353 354 static void imx8qxp_pc_bridge_remove(struct platform_device *pdev) 355 { 356 struct imx8qxp_pc *pc = platform_get_drvdata(pdev); 357 struct imx8qxp_pc_channel *ch; 358 int i; 359 360 for (i = 0; i < 2; i++) { 361 ch = &pc->ch[i]; 362 363 if (!ch->is_available) 364 continue; 365 366 drm_bridge_remove(&ch->bridge); 367 ch->is_available = false; 368 } 369 370 pm_runtime_disable(&pdev->dev); 371 } 372 373 static int imx8qxp_pc_runtime_suspend(struct device *dev) 374 { 375 struct platform_device *pdev = to_platform_device(dev); 376 struct imx8qxp_pc *pc = platform_get_drvdata(pdev); 377 int ret; 378 379 ret = clk_prepare_enable(pc->clk_apb); 380 if (ret) 381 DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n", 382 __func__, ret); 383 384 /* Disable pixel combiner by full reset. */ 385 imx8qxp_pc_write_clr(pc, PC_SW_RESET_REG, PC_FULL_RESET_N); 386 387 clk_disable_unprepare(pc->clk_apb); 388 389 /* Ensure the reset takes effect. */ 390 usleep_range(10, 20); 391 392 return ret; 393 } 394 395 static int imx8qxp_pc_runtime_resume(struct device *dev) 396 { 397 struct platform_device *pdev = to_platform_device(dev); 398 struct imx8qxp_pc *pc = platform_get_drvdata(pdev); 399 int ret; 400 401 ret = clk_prepare_enable(pc->clk_apb); 402 if (ret) { 403 DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n", 404 __func__, ret); 405 return ret; 406 } 407 408 /* out of reset */ 409 imx8qxp_pc_write_set(pc, PC_SW_RESET_REG, PC_FULL_RESET_N); 410 411 clk_disable_unprepare(pc->clk_apb); 412 413 return ret; 414 } 415 416 static const struct dev_pm_ops imx8qxp_pc_pm_ops = { 417 RUNTIME_PM_OPS(imx8qxp_pc_runtime_suspend, imx8qxp_pc_runtime_resume, NULL) 418 }; 419 420 static const struct of_device_id imx8qxp_pc_dt_ids[] = { 421 { .compatible = "fsl,imx8qm-pixel-combiner", }, 422 { .compatible = "fsl,imx8qxp-pixel-combiner", }, 423 { /* sentinel */ } 424 }; 425 MODULE_DEVICE_TABLE(of, imx8qxp_pc_dt_ids); 426 427 static struct platform_driver imx8qxp_pc_bridge_driver = { 428 .probe = imx8qxp_pc_bridge_probe, 429 .remove = imx8qxp_pc_bridge_remove, 430 .driver = { 431 .pm = pm_ptr(&imx8qxp_pc_pm_ops), 432 .name = DRIVER_NAME, 433 .of_match_table = imx8qxp_pc_dt_ids, 434 }, 435 }; 436 module_platform_driver(imx8qxp_pc_bridge_driver); 437 438 MODULE_DESCRIPTION("i.MX8QM/QXP pixel combiner bridge driver"); 439 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); 440 MODULE_LICENSE("GPL v2"); 441 MODULE_ALIAS("platform:" DRIVER_NAME); 442