1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Rockchip SoC DP (Display Port) interface driver. 4 * 5 * Copyright (C) Fuzhou Rockchip Electronics Co., Ltd. 6 * Author: Andy Yan <andy.yan@rock-chips.com> 7 * Yakir Yang <ykk@rock-chips.com> 8 * Jeff Chen <jeff.chen@rock-chips.com> 9 */ 10 11 #include <linux/component.h> 12 #include <linux/mfd/syscon.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 #include <linux/regmap.h> 18 #include <linux/reset.h> 19 #include <linux/clk.h> 20 21 #include <video/of_videomode.h> 22 #include <video/videomode.h> 23 24 #include <drm/display/drm_dp_helper.h> 25 #include <drm/drm_atomic.h> 26 #include <drm/drm_atomic_helper.h> 27 #include <drm/bridge/analogix_dp.h> 28 #include <drm/drm_of.h> 29 #include <drm/drm_panel.h> 30 #include <drm/drm_probe_helper.h> 31 #include <drm/drm_simple_kms_helper.h> 32 33 #include "rockchip_drm_drv.h" 34 35 #define RK3288_GRF_SOC_CON6 0x25c 36 #define RK3288_EDP_LCDC_SEL BIT(5) 37 #define RK3399_GRF_SOC_CON20 0x6250 38 #define RK3399_EDP_LCDC_SEL BIT(5) 39 40 #define HIWORD_UPDATE(val, mask) (val | (mask) << 16) 41 42 #define PSR_WAIT_LINE_FLAG_TIMEOUT_MS 100 43 44 /** 45 * struct rockchip_dp_chip_data - splite the grf setting of kind of chips 46 * @lcdsel_grf_reg: grf register offset of lcdc select 47 * @lcdsel_big: reg value of selecting vop big for eDP 48 * @lcdsel_lit: reg value of selecting vop little for eDP 49 * @chip_type: specific chip type 50 */ 51 struct rockchip_dp_chip_data { 52 u32 lcdsel_grf_reg; 53 u32 lcdsel_big; 54 u32 lcdsel_lit; 55 u32 chip_type; 56 }; 57 58 struct rockchip_dp_device { 59 struct drm_device *drm_dev; 60 struct device *dev; 61 struct rockchip_encoder encoder; 62 struct drm_display_mode mode; 63 64 struct clk *pclk; 65 struct clk *grfclk; 66 struct regmap *grf; 67 struct reset_control *rst; 68 69 const struct rockchip_dp_chip_data *data; 70 71 struct analogix_dp_device *adp; 72 struct analogix_dp_plat_data plat_data; 73 }; 74 75 static struct rockchip_dp_device *encoder_to_dp(struct drm_encoder *encoder) 76 { 77 struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder); 78 79 return container_of(rkencoder, struct rockchip_dp_device, encoder); 80 } 81 82 static struct rockchip_dp_device *pdata_encoder_to_dp(struct analogix_dp_plat_data *plat_data) 83 { 84 return container_of(plat_data, struct rockchip_dp_device, plat_data); 85 } 86 87 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp) 88 { 89 reset_control_assert(dp->rst); 90 usleep_range(10, 20); 91 reset_control_deassert(dp->rst); 92 93 return 0; 94 } 95 96 static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data) 97 { 98 struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data); 99 int ret; 100 101 ret = clk_prepare_enable(dp->pclk); 102 if (ret < 0) { 103 DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret); 104 return ret; 105 } 106 107 ret = rockchip_dp_pre_init(dp); 108 if (ret < 0) { 109 DRM_DEV_ERROR(dp->dev, "failed to dp pre init %d\n", ret); 110 clk_disable_unprepare(dp->pclk); 111 return ret; 112 } 113 114 return ret; 115 } 116 117 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data) 118 { 119 struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data); 120 121 clk_disable_unprepare(dp->pclk); 122 123 return 0; 124 } 125 126 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data, 127 struct drm_connector *connector) 128 { 129 struct drm_display_info *di = &connector->display_info; 130 /* VOP couldn't output YUV video format for eDP rightly */ 131 u32 mask = DRM_COLOR_FORMAT_YCBCR444 | DRM_COLOR_FORMAT_YCBCR422; 132 133 if ((di->color_formats & mask)) { 134 DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n"); 135 di->color_formats &= ~mask; 136 di->color_formats |= DRM_COLOR_FORMAT_RGB444; 137 di->bpc = 8; 138 } 139 140 return 0; 141 } 142 143 static bool 144 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder, 145 const struct drm_display_mode *mode, 146 struct drm_display_mode *adjusted_mode) 147 { 148 /* do nothing */ 149 return true; 150 } 151 152 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder, 153 struct drm_display_mode *mode, 154 struct drm_display_mode *adjusted) 155 { 156 /* do nothing */ 157 } 158 159 static 160 struct drm_crtc *rockchip_dp_drm_get_new_crtc(struct drm_encoder *encoder, 161 struct drm_atomic_state *state) 162 { 163 struct drm_connector *connector; 164 struct drm_connector_state *conn_state; 165 166 connector = drm_atomic_get_new_connector_for_encoder(state, encoder); 167 if (!connector) 168 return NULL; 169 170 conn_state = drm_atomic_get_new_connector_state(state, connector); 171 if (!conn_state) 172 return NULL; 173 174 return conn_state->crtc; 175 } 176 177 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder, 178 struct drm_atomic_state *state) 179 { 180 struct rockchip_dp_device *dp = encoder_to_dp(encoder); 181 struct drm_crtc *crtc; 182 struct drm_crtc_state *old_crtc_state; 183 int ret; 184 u32 val; 185 186 crtc = rockchip_dp_drm_get_new_crtc(encoder, state); 187 if (!crtc) 188 return; 189 190 old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc); 191 /* Coming back from self refresh, nothing to do */ 192 if (old_crtc_state && old_crtc_state->self_refresh_active) 193 return; 194 195 ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder); 196 if (ret < 0) 197 return; 198 199 if (ret) 200 val = dp->data->lcdsel_lit; 201 else 202 val = dp->data->lcdsel_big; 203 204 DRM_DEV_DEBUG(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG"); 205 206 ret = clk_prepare_enable(dp->grfclk); 207 if (ret < 0) { 208 DRM_DEV_ERROR(dp->dev, "failed to enable grfclk %d\n", ret); 209 return; 210 } 211 212 ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val); 213 if (ret != 0) 214 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret); 215 216 clk_disable_unprepare(dp->grfclk); 217 } 218 219 static void rockchip_dp_drm_encoder_disable(struct drm_encoder *encoder, 220 struct drm_atomic_state *state) 221 { 222 struct rockchip_dp_device *dp = encoder_to_dp(encoder); 223 struct drm_crtc *crtc; 224 struct drm_crtc_state *new_crtc_state = NULL; 225 int ret; 226 227 crtc = rockchip_dp_drm_get_new_crtc(encoder, state); 228 /* No crtc means we're doing a full shutdown */ 229 if (!crtc) 230 return; 231 232 new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 233 /* If we're not entering self-refresh, no need to wait for vact */ 234 if (!new_crtc_state || !new_crtc_state->self_refresh_active) 235 return; 236 237 ret = rockchip_drm_wait_vact_end(crtc, PSR_WAIT_LINE_FLAG_TIMEOUT_MS); 238 if (ret) 239 DRM_DEV_ERROR(dp->dev, "line flag irq timed out\n"); 240 } 241 242 static int 243 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder, 244 struct drm_crtc_state *crtc_state, 245 struct drm_connector_state *conn_state) 246 { 247 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state); 248 struct drm_display_info *di = &conn_state->connector->display_info; 249 250 /* 251 * The hardware IC designed that VOP must output the RGB10 video 252 * format to eDP controller, and if eDP panel only support RGB8, 253 * then eDP controller should cut down the video data, not via VOP 254 * controller, that's why we need to hardcode the VOP output mode 255 * to RGA10 here. 256 */ 257 258 s->output_mode = ROCKCHIP_OUT_MODE_AAAA; 259 s->output_type = DRM_MODE_CONNECTOR_eDP; 260 s->output_bpc = di->bpc; 261 262 return 0; 263 } 264 265 static const struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = { 266 .mode_fixup = rockchip_dp_drm_encoder_mode_fixup, 267 .mode_set = rockchip_dp_drm_encoder_mode_set, 268 .atomic_enable = rockchip_dp_drm_encoder_enable, 269 .atomic_disable = rockchip_dp_drm_encoder_disable, 270 .atomic_check = rockchip_dp_drm_encoder_atomic_check, 271 }; 272 273 static int rockchip_dp_of_probe(struct rockchip_dp_device *dp) 274 { 275 struct device *dev = dp->dev; 276 struct device_node *np = dev->of_node; 277 278 dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf"); 279 if (IS_ERR(dp->grf)) { 280 DRM_DEV_ERROR(dev, "failed to get rockchip,grf property\n"); 281 return PTR_ERR(dp->grf); 282 } 283 284 dp->grfclk = devm_clk_get(dev, "grf"); 285 if (PTR_ERR(dp->grfclk) == -ENOENT) { 286 dp->grfclk = NULL; 287 } else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) { 288 return -EPROBE_DEFER; 289 } else if (IS_ERR(dp->grfclk)) { 290 DRM_DEV_ERROR(dev, "failed to get grf clock\n"); 291 return PTR_ERR(dp->grfclk); 292 } 293 294 dp->pclk = devm_clk_get(dev, "pclk"); 295 if (IS_ERR(dp->pclk)) { 296 DRM_DEV_ERROR(dev, "failed to get pclk property\n"); 297 return PTR_ERR(dp->pclk); 298 } 299 300 dp->rst = devm_reset_control_get(dev, "dp"); 301 if (IS_ERR(dp->rst)) { 302 DRM_DEV_ERROR(dev, "failed to get dp reset control\n"); 303 return PTR_ERR(dp->rst); 304 } 305 306 return 0; 307 } 308 309 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp) 310 { 311 struct drm_encoder *encoder = &dp->encoder.encoder; 312 struct drm_device *drm_dev = dp->drm_dev; 313 struct device *dev = dp->dev; 314 int ret; 315 316 encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev, 317 dev->of_node); 318 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs); 319 320 ret = drm_simple_encoder_init(drm_dev, encoder, 321 DRM_MODE_ENCODER_TMDS); 322 if (ret) { 323 DRM_ERROR("failed to initialize encoder with drm\n"); 324 return ret; 325 } 326 327 drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs); 328 329 return 0; 330 } 331 332 static int rockchip_dp_bind(struct device *dev, struct device *master, 333 void *data) 334 { 335 struct rockchip_dp_device *dp = dev_get_drvdata(dev); 336 struct drm_device *drm_dev = data; 337 int ret; 338 339 dp->drm_dev = drm_dev; 340 341 ret = rockchip_dp_drm_create_encoder(dp); 342 if (ret) { 343 DRM_ERROR("failed to create drm encoder\n"); 344 return ret; 345 } 346 347 rockchip_drm_encoder_set_crtc_endpoint_id(&dp->encoder, 348 dev->of_node, 0, 0); 349 350 dp->plat_data.encoder = &dp->encoder.encoder; 351 352 ret = analogix_dp_bind(dp->adp, drm_dev); 353 if (ret) 354 goto err_cleanup_encoder; 355 356 return 0; 357 err_cleanup_encoder: 358 dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder); 359 return ret; 360 } 361 362 static void rockchip_dp_unbind(struct device *dev, struct device *master, 363 void *data) 364 { 365 struct rockchip_dp_device *dp = dev_get_drvdata(dev); 366 367 analogix_dp_unbind(dp->adp); 368 dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder); 369 } 370 371 static const struct component_ops rockchip_dp_component_ops = { 372 .bind = rockchip_dp_bind, 373 .unbind = rockchip_dp_unbind, 374 }; 375 376 static int rockchip_dp_probe(struct platform_device *pdev) 377 { 378 struct device *dev = &pdev->dev; 379 const struct rockchip_dp_chip_data *dp_data; 380 struct drm_panel *panel = NULL; 381 struct rockchip_dp_device *dp; 382 int ret; 383 384 dp_data = of_device_get_match_data(dev); 385 if (!dp_data) 386 return -ENODEV; 387 388 ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); 389 if (ret < 0) 390 return ret; 391 392 dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL); 393 if (!dp) 394 return -ENOMEM; 395 396 dp->dev = dev; 397 dp->adp = ERR_PTR(-ENODEV); 398 dp->data = dp_data; 399 dp->plat_data.panel = panel; 400 dp->plat_data.dev_type = dp->data->chip_type; 401 dp->plat_data.power_on = rockchip_dp_poweron; 402 dp->plat_data.power_off = rockchip_dp_powerdown; 403 dp->plat_data.get_modes = rockchip_dp_get_modes; 404 405 ret = rockchip_dp_of_probe(dp); 406 if (ret < 0) 407 return ret; 408 409 platform_set_drvdata(pdev, dp); 410 411 dp->adp = analogix_dp_probe(dev, &dp->plat_data); 412 if (IS_ERR(dp->adp)) 413 return PTR_ERR(dp->adp); 414 415 ret = component_add(dev, &rockchip_dp_component_ops); 416 if (ret) 417 return ret; 418 419 return 0; 420 } 421 422 static void rockchip_dp_remove(struct platform_device *pdev) 423 { 424 component_del(&pdev->dev, &rockchip_dp_component_ops); 425 } 426 427 static int rockchip_dp_suspend(struct device *dev) 428 { 429 struct rockchip_dp_device *dp = dev_get_drvdata(dev); 430 431 if (IS_ERR(dp->adp)) 432 return 0; 433 434 return analogix_dp_suspend(dp->adp); 435 } 436 437 static int rockchip_dp_resume(struct device *dev) 438 { 439 struct rockchip_dp_device *dp = dev_get_drvdata(dev); 440 441 if (IS_ERR(dp->adp)) 442 return 0; 443 444 return analogix_dp_resume(dp->adp); 445 } 446 447 static DEFINE_RUNTIME_DEV_PM_OPS(rockchip_dp_pm_ops, rockchip_dp_suspend, 448 rockchip_dp_resume, NULL); 449 450 static const struct rockchip_dp_chip_data rk3399_edp = { 451 .lcdsel_grf_reg = RK3399_GRF_SOC_CON20, 452 .lcdsel_big = HIWORD_UPDATE(0, RK3399_EDP_LCDC_SEL), 453 .lcdsel_lit = HIWORD_UPDATE(RK3399_EDP_LCDC_SEL, RK3399_EDP_LCDC_SEL), 454 .chip_type = RK3399_EDP, 455 }; 456 457 static const struct rockchip_dp_chip_data rk3288_dp = { 458 .lcdsel_grf_reg = RK3288_GRF_SOC_CON6, 459 .lcdsel_big = HIWORD_UPDATE(0, RK3288_EDP_LCDC_SEL), 460 .lcdsel_lit = HIWORD_UPDATE(RK3288_EDP_LCDC_SEL, RK3288_EDP_LCDC_SEL), 461 .chip_type = RK3288_DP, 462 }; 463 464 static const struct of_device_id rockchip_dp_dt_ids[] = { 465 {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp }, 466 {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp }, 467 {} 468 }; 469 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids); 470 471 struct platform_driver rockchip_dp_driver = { 472 .probe = rockchip_dp_probe, 473 .remove_new = rockchip_dp_remove, 474 .driver = { 475 .name = "rockchip-dp", 476 .pm = pm_ptr(&rockchip_dp_pm_ops), 477 .of_match_table = rockchip_dp_dt_ids, 478 }, 479 }; 480