1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Free Electrons 4 * Copyright (C) 2015 NextThing Co 5 * 6 * Maxime Ripard <maxime.ripard@free-electrons.com> 7 */ 8 9 #include <linux/component.h> 10 #include <linux/list.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include <linux/of_graph.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/platform_device.h> 16 #include <linux/reset.h> 17 18 #include <drm/drm_atomic.h> 19 #include <drm/drm_atomic_helper.h> 20 #include <drm/drm_crtc.h> 21 #include <drm/drm_fb_cma_helper.h> 22 #include <drm/drm_fourcc.h> 23 #include <drm/drm_gem_cma_helper.h> 24 #include <drm/drm_plane_helper.h> 25 #include <drm/drm_probe_helper.h> 26 27 #include "sun4i_backend.h" 28 #include "sun4i_drv.h" 29 #include "sun4i_frontend.h" 30 #include "sun4i_layer.h" 31 #include "sunxi_engine.h" 32 33 struct sun4i_backend_quirks { 34 /* backend <-> TCON muxing selection done in backend */ 35 bool needs_output_muxing; 36 37 /* alpha at the lowest z position is not always supported */ 38 bool supports_lowest_plane_alpha; 39 }; 40 41 static const u32 sunxi_rgb2yuv_coef[12] = { 42 0x00000107, 0x00000204, 0x00000064, 0x00000108, 43 0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808, 44 0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808 45 }; 46 47 static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine) 48 { 49 int i; 50 51 DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n"); 52 53 /* Set color correction */ 54 regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG, 55 SUN4I_BACKEND_OCCTL_ENABLE); 56 57 for (i = 0; i < 12; i++) 58 regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i), 59 sunxi_rgb2yuv_coef[i]); 60 } 61 62 static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine) 63 { 64 DRM_DEBUG_DRIVER("Disabling color correction\n"); 65 66 /* Disable color correction */ 67 regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG, 68 SUN4I_BACKEND_OCCTL_ENABLE, 0); 69 } 70 71 static void sun4i_backend_commit(struct sunxi_engine *engine) 72 { 73 DRM_DEBUG_DRIVER("Committing changes\n"); 74 75 regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG, 76 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS | 77 SUN4I_BACKEND_REGBUFFCTL_LOADCTL); 78 } 79 80 void sun4i_backend_layer_enable(struct sun4i_backend *backend, 81 int layer, bool enable) 82 { 83 u32 val; 84 85 DRM_DEBUG_DRIVER("%sabling layer %d\n", enable ? "En" : "Dis", 86 layer); 87 88 if (enable) 89 val = SUN4I_BACKEND_MODCTL_LAY_EN(layer); 90 else 91 val = 0; 92 93 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 94 SUN4I_BACKEND_MODCTL_LAY_EN(layer), val); 95 } 96 97 static int sun4i_backend_drm_format_to_layer(u32 format, u32 *mode) 98 { 99 switch (format) { 100 case DRM_FORMAT_ARGB8888: 101 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888; 102 break; 103 104 case DRM_FORMAT_ARGB4444: 105 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444; 106 break; 107 108 case DRM_FORMAT_ARGB1555: 109 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555; 110 break; 111 112 case DRM_FORMAT_RGBA5551: 113 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551; 114 break; 115 116 case DRM_FORMAT_RGBA4444: 117 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444; 118 break; 119 120 case DRM_FORMAT_XRGB8888: 121 *mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888; 122 break; 123 124 case DRM_FORMAT_RGB888: 125 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB888; 126 break; 127 128 case DRM_FORMAT_RGB565: 129 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB565; 130 break; 131 132 default: 133 return -EINVAL; 134 } 135 136 return 0; 137 } 138 139 static const uint32_t sun4i_backend_formats[] = { 140 DRM_FORMAT_ARGB1555, 141 DRM_FORMAT_ARGB4444, 142 DRM_FORMAT_ARGB8888, 143 DRM_FORMAT_RGB565, 144 DRM_FORMAT_RGB888, 145 DRM_FORMAT_RGBA4444, 146 DRM_FORMAT_RGBA5551, 147 DRM_FORMAT_UYVY, 148 DRM_FORMAT_VYUY, 149 DRM_FORMAT_XRGB8888, 150 DRM_FORMAT_YUYV, 151 DRM_FORMAT_YVYU, 152 }; 153 154 bool sun4i_backend_format_is_supported(uint32_t fmt, uint64_t modifier) 155 { 156 unsigned int i; 157 158 if (modifier != DRM_FORMAT_MOD_LINEAR) 159 return false; 160 161 for (i = 0; i < ARRAY_SIZE(sun4i_backend_formats); i++) 162 if (sun4i_backend_formats[i] == fmt) 163 return true; 164 165 return false; 166 } 167 168 int sun4i_backend_update_layer_coord(struct sun4i_backend *backend, 169 int layer, struct drm_plane *plane) 170 { 171 struct drm_plane_state *state = plane->state; 172 173 DRM_DEBUG_DRIVER("Updating layer %d\n", layer); 174 175 /* Set height and width */ 176 DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n", 177 state->crtc_w, state->crtc_h); 178 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer), 179 SUN4I_BACKEND_LAYSIZE(state->crtc_w, 180 state->crtc_h)); 181 182 /* Set base coordinates */ 183 DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n", 184 state->crtc_x, state->crtc_y); 185 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer), 186 SUN4I_BACKEND_LAYCOOR(state->crtc_x, 187 state->crtc_y)); 188 189 return 0; 190 } 191 192 static int sun4i_backend_update_yuv_format(struct sun4i_backend *backend, 193 int layer, struct drm_plane *plane) 194 { 195 struct drm_plane_state *state = plane->state; 196 struct drm_framebuffer *fb = state->fb; 197 const struct drm_format_info *format = fb->format; 198 const uint32_t fmt = format->format; 199 u32 val = SUN4I_BACKEND_IYUVCTL_EN; 200 int i; 201 202 for (i = 0; i < ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef); i++) 203 regmap_write(backend->engine.regs, 204 SUN4I_BACKEND_YGCOEF_REG(i), 205 sunxi_bt601_yuv2rgb_coef[i]); 206 207 /* 208 * We should do that only for a single plane, but the 209 * framebuffer's atomic_check has our back on this. 210 */ 211 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 212 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 213 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN); 214 215 /* TODO: Add support for the multi-planar YUV formats */ 216 if (drm_format_info_is_yuv_packed(format) && 217 drm_format_info_is_yuv_sampling_422(format)) 218 val |= SUN4I_BACKEND_IYUVCTL_FBFMT_PACKED_YUV422; 219 else 220 DRM_DEBUG_DRIVER("Unsupported YUV format (0x%x)\n", fmt); 221 222 /* 223 * Allwinner seems to list the pixel sequence from right to left, while 224 * DRM lists it from left to right. 225 */ 226 switch (fmt) { 227 case DRM_FORMAT_YUYV: 228 val |= SUN4I_BACKEND_IYUVCTL_FBPS_VYUY; 229 break; 230 case DRM_FORMAT_YVYU: 231 val |= SUN4I_BACKEND_IYUVCTL_FBPS_UYVY; 232 break; 233 case DRM_FORMAT_UYVY: 234 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YVYU; 235 break; 236 case DRM_FORMAT_VYUY: 237 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YUYV; 238 break; 239 default: 240 DRM_DEBUG_DRIVER("Unsupported YUV pixel sequence (0x%x)\n", 241 fmt); 242 } 243 244 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVCTL_REG, val); 245 246 return 0; 247 } 248 249 int sun4i_backend_update_layer_formats(struct sun4i_backend *backend, 250 int layer, struct drm_plane *plane) 251 { 252 struct drm_plane_state *state = plane->state; 253 struct drm_framebuffer *fb = state->fb; 254 u32 val; 255 int ret; 256 257 /* Clear the YUV mode */ 258 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 259 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0); 260 261 val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >> 8); 262 if (state->alpha != DRM_BLEND_ALPHA_OPAQUE) 263 val |= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN; 264 regmap_update_bits(backend->engine.regs, 265 SUN4I_BACKEND_ATTCTL_REG0(layer), 266 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK | 267 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN, 268 val); 269 270 if (fb->format->is_yuv) 271 return sun4i_backend_update_yuv_format(backend, layer, plane); 272 273 ret = sun4i_backend_drm_format_to_layer(fb->format->format, &val); 274 if (ret) { 275 DRM_DEBUG_DRIVER("Invalid format\n"); 276 return ret; 277 } 278 279 regmap_update_bits(backend->engine.regs, 280 SUN4I_BACKEND_ATTCTL_REG1(layer), 281 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); 282 283 return 0; 284 } 285 286 int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend, 287 int layer, uint32_t fmt) 288 { 289 u32 val; 290 int ret; 291 292 ret = sun4i_backend_drm_format_to_layer(fmt, &val); 293 if (ret) { 294 DRM_DEBUG_DRIVER("Invalid format\n"); 295 return ret; 296 } 297 298 regmap_update_bits(backend->engine.regs, 299 SUN4I_BACKEND_ATTCTL_REG0(layer), 300 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN, 301 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN); 302 303 regmap_update_bits(backend->engine.regs, 304 SUN4I_BACKEND_ATTCTL_REG1(layer), 305 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); 306 307 return 0; 308 } 309 310 static int sun4i_backend_update_yuv_buffer(struct sun4i_backend *backend, 311 struct drm_framebuffer *fb, 312 dma_addr_t paddr) 313 { 314 /* TODO: Add support for the multi-planar YUV formats */ 315 DRM_DEBUG_DRIVER("Setting packed YUV buffer address to %pad\n", &paddr); 316 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVADD_REG(0), paddr); 317 318 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); 319 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVLINEWIDTH_REG(0), 320 fb->pitches[0] * 8); 321 322 return 0; 323 } 324 325 int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend, 326 int layer, struct drm_plane *plane) 327 { 328 struct drm_plane_state *state = plane->state; 329 struct drm_framebuffer *fb = state->fb; 330 u32 lo_paddr, hi_paddr; 331 dma_addr_t paddr; 332 333 /* Set the line width */ 334 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); 335 regmap_write(backend->engine.regs, 336 SUN4I_BACKEND_LAYLINEWIDTH_REG(layer), 337 fb->pitches[0] * 8); 338 339 /* Get the start of the displayed memory */ 340 paddr = drm_fb_cma_get_gem_addr(fb, state, 0); 341 DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr); 342 343 if (fb->format->is_yuv) 344 return sun4i_backend_update_yuv_buffer(backend, fb, paddr); 345 346 /* Write the 32 lower bits of the address (in bits) */ 347 lo_paddr = paddr << 3; 348 DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr); 349 regmap_write(backend->engine.regs, 350 SUN4I_BACKEND_LAYFB_L32ADD_REG(layer), 351 lo_paddr); 352 353 /* And the upper bits */ 354 hi_paddr = paddr >> 29; 355 DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr); 356 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG, 357 SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer), 358 SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr)); 359 360 return 0; 361 } 362 363 int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer, 364 struct drm_plane *plane) 365 { 366 struct drm_plane_state *state = plane->state; 367 struct sun4i_layer_state *p_state = state_to_sun4i_layer_state(state); 368 unsigned int priority = state->normalized_zpos; 369 unsigned int pipe = p_state->pipe; 370 371 DRM_DEBUG_DRIVER("Setting layer %d's priority to %d and pipe %d\n", 372 layer, priority, pipe); 373 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 374 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK | 375 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK, 376 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(p_state->pipe) | 377 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority)); 378 379 return 0; 380 } 381 382 void sun4i_backend_cleanup_layer(struct sun4i_backend *backend, 383 int layer) 384 { 385 regmap_update_bits(backend->engine.regs, 386 SUN4I_BACKEND_ATTCTL_REG0(layer), 387 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN | 388 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0); 389 } 390 391 static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state) 392 { 393 u16 src_h = state->src_h >> 16; 394 u16 src_w = state->src_w >> 16; 395 396 DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n", 397 src_w, src_h, state->crtc_w, state->crtc_h); 398 399 if ((state->crtc_h != src_h) || (state->crtc_w != src_w)) 400 return true; 401 402 return false; 403 } 404 405 static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state) 406 { 407 struct sun4i_layer *layer = plane_to_sun4i_layer(state->plane); 408 struct sun4i_backend *backend = layer->backend; 409 uint32_t format = state->fb->format->format; 410 uint64_t modifier = state->fb->modifier; 411 412 if (IS_ERR(backend->frontend)) 413 return false; 414 415 if (!sun4i_frontend_format_is_supported(format, modifier)) 416 return false; 417 418 if (!sun4i_backend_format_is_supported(format, modifier)) 419 return true; 420 421 /* 422 * TODO: The backend alone allows 2x and 4x integer scaling, including 423 * support for an alpha component (which the frontend doesn't support). 424 * Use the backend directly instead of the frontend in this case, with 425 * another test to return false. 426 */ 427 428 if (sun4i_backend_plane_uses_scaler(state)) 429 return true; 430 431 /* 432 * Here the format is supported by both the frontend and the backend 433 * and no frontend scaling is required, so use the backend directly. 434 */ 435 return false; 436 } 437 438 static bool sun4i_backend_plane_is_supported(struct drm_plane_state *state, 439 bool *uses_frontend) 440 { 441 if (sun4i_backend_plane_uses_frontend(state)) { 442 *uses_frontend = true; 443 return true; 444 } 445 446 *uses_frontend = false; 447 448 /* Scaling is not supported without the frontend. */ 449 if (sun4i_backend_plane_uses_scaler(state)) 450 return false; 451 452 return true; 453 } 454 455 static void sun4i_backend_atomic_begin(struct sunxi_engine *engine, 456 struct drm_crtc_state *old_state) 457 { 458 u32 val; 459 460 WARN_ON(regmap_read_poll_timeout(engine->regs, 461 SUN4I_BACKEND_REGBUFFCTL_REG, 462 val, !(val & SUN4I_BACKEND_REGBUFFCTL_LOADCTL), 463 100, 50000)); 464 } 465 466 static int sun4i_backend_atomic_check(struct sunxi_engine *engine, 467 struct drm_crtc_state *crtc_state) 468 { 469 struct drm_plane_state *plane_states[SUN4I_BACKEND_NUM_LAYERS] = { 0 }; 470 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 471 struct drm_atomic_state *state = crtc_state->state; 472 struct drm_device *drm = state->dev; 473 struct drm_plane *plane; 474 unsigned int num_planes = 0; 475 unsigned int num_alpha_planes = 0; 476 unsigned int num_frontend_planes = 0; 477 unsigned int num_alpha_planes_max = 1; 478 unsigned int num_yuv_planes = 0; 479 unsigned int current_pipe = 0; 480 unsigned int i; 481 482 DRM_DEBUG_DRIVER("Starting checking our planes\n"); 483 484 if (!crtc_state->planes_changed) 485 return 0; 486 487 drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) { 488 struct drm_plane_state *plane_state = 489 drm_atomic_get_plane_state(state, plane); 490 struct sun4i_layer_state *layer_state = 491 state_to_sun4i_layer_state(plane_state); 492 struct drm_framebuffer *fb = plane_state->fb; 493 494 if (!sun4i_backend_plane_is_supported(plane_state, 495 &layer_state->uses_frontend)) 496 return -EINVAL; 497 498 if (layer_state->uses_frontend) { 499 DRM_DEBUG_DRIVER("Using the frontend for plane %d\n", 500 plane->index); 501 num_frontend_planes++; 502 } else { 503 if (fb->format->is_yuv) { 504 DRM_DEBUG_DRIVER("Plane FB format is YUV\n"); 505 num_yuv_planes++; 506 } 507 } 508 509 DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n", 510 &fb->format->format); 511 if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 512 num_alpha_planes++; 513 514 DRM_DEBUG_DRIVER("Plane zpos is %d\n", 515 plane_state->normalized_zpos); 516 517 /* Sort our planes by Zpos */ 518 plane_states[plane_state->normalized_zpos] = plane_state; 519 520 num_planes++; 521 } 522 523 /* All our planes were disabled, bail out */ 524 if (!num_planes) 525 return 0; 526 527 /* 528 * The hardware is a bit unusual here. 529 * 530 * Even though it supports 4 layers, it does the composition 531 * in two separate steps. 532 * 533 * The first one is assigning a layer to one of its two 534 * pipes. If more that 1 layer is assigned to the same pipe, 535 * and if pixels overlaps, the pipe will take the pixel from 536 * the layer with the highest priority. 537 * 538 * The second step is the actual alpha blending, that takes 539 * the two pipes as input, and uses the potential alpha 540 * component to do the transparency between the two. 541 * 542 * This two-step scenario makes us unable to guarantee a 543 * robust alpha blending between the 4 layers in all 544 * situations, since this means that we need to have one layer 545 * with alpha at the lowest position of our two pipes. 546 * 547 * However, we cannot even do that on every platform, since 548 * the hardware has a bug where the lowest plane of the lowest 549 * pipe (pipe 0, priority 0), if it has any alpha, will 550 * discard the pixel data entirely and just display the pixels 551 * in the background color (black by default). 552 * 553 * This means that on the affected platforms, we effectively 554 * have only three valid configurations with alpha, all of 555 * them with the alpha being on pipe1 with the lowest 556 * position, which can be 1, 2 or 3 depending on the number of 557 * planes and their zpos. 558 */ 559 560 /* For platforms that are not affected by the issue described above. */ 561 if (backend->quirks->supports_lowest_plane_alpha) 562 num_alpha_planes_max++; 563 564 if (num_alpha_planes > num_alpha_planes_max) { 565 DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n"); 566 return -EINVAL; 567 } 568 569 /* We can't have an alpha plane at the lowest position */ 570 if (!backend->quirks->supports_lowest_plane_alpha && 571 (plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE)) 572 return -EINVAL; 573 574 for (i = 1; i < num_planes; i++) { 575 struct drm_plane_state *p_state = plane_states[i]; 576 struct drm_framebuffer *fb = p_state->fb; 577 struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(p_state); 578 579 /* 580 * The only alpha position is the lowest plane of the 581 * second pipe. 582 */ 583 if (fb->format->has_alpha || (p_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 584 current_pipe++; 585 586 s_state->pipe = current_pipe; 587 } 588 589 /* We can only have a single YUV plane at a time */ 590 if (num_yuv_planes > SUN4I_BACKEND_NUM_YUV_PLANES) { 591 DRM_DEBUG_DRIVER("Too many planes with YUV, rejecting...\n"); 592 return -EINVAL; 593 } 594 595 if (num_frontend_planes > SUN4I_BACKEND_NUM_FRONTEND_LAYERS) { 596 DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n"); 597 return -EINVAL; 598 } 599 600 DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n", 601 num_planes, num_alpha_planes, num_frontend_planes, 602 num_yuv_planes); 603 604 return 0; 605 } 606 607 static void sun4i_backend_vblank_quirk(struct sunxi_engine *engine) 608 { 609 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 610 struct sun4i_frontend *frontend = backend->frontend; 611 612 if (!frontend) 613 return; 614 615 /* 616 * In a teardown scenario with the frontend involved, we have 617 * to keep the frontend enabled until the next vblank, and 618 * only then disable it. 619 * 620 * This is due to the fact that the backend will not take into 621 * account the new configuration (with the plane that used to 622 * be fed by the frontend now disabled) until we write to the 623 * commit bit and the hardware fetches the new configuration 624 * during the next vblank. 625 * 626 * So we keep the frontend around in order to prevent any 627 * visual artifacts. 628 */ 629 spin_lock(&backend->frontend_lock); 630 if (backend->frontend_teardown) { 631 sun4i_frontend_exit(frontend); 632 backend->frontend_teardown = false; 633 } 634 spin_unlock(&backend->frontend_lock); 635 }; 636 637 static void sun4i_backend_mode_set(struct sunxi_engine *engine, 638 const struct drm_display_mode *mode) 639 { 640 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 641 642 DRM_DEBUG_DRIVER("Updating global size W: %u H: %u\n", 643 mode->hdisplay, mode->vdisplay); 644 645 regmap_write(engine->regs, SUN4I_BACKEND_DISSIZE_REG, 646 SUN4I_BACKEND_DISSIZE(mode->hdisplay, mode->vdisplay)); 647 648 regmap_update_bits(engine->regs, SUN4I_BACKEND_MODCTL_REG, 649 SUN4I_BACKEND_MODCTL_ITLMOD_EN, 650 interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0); 651 652 DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n", 653 interlaced ? "on" : "off"); 654 } 655 656 static int sun4i_backend_init_sat(struct device *dev) { 657 struct sun4i_backend *backend = dev_get_drvdata(dev); 658 int ret; 659 660 backend->sat_reset = devm_reset_control_get(dev, "sat"); 661 if (IS_ERR(backend->sat_reset)) { 662 dev_err(dev, "Couldn't get the SAT reset line\n"); 663 return PTR_ERR(backend->sat_reset); 664 } 665 666 ret = reset_control_deassert(backend->sat_reset); 667 if (ret) { 668 dev_err(dev, "Couldn't deassert the SAT reset line\n"); 669 return ret; 670 } 671 672 backend->sat_clk = devm_clk_get(dev, "sat"); 673 if (IS_ERR(backend->sat_clk)) { 674 dev_err(dev, "Couldn't get our SAT clock\n"); 675 ret = PTR_ERR(backend->sat_clk); 676 goto err_assert_reset; 677 } 678 679 ret = clk_prepare_enable(backend->sat_clk); 680 if (ret) { 681 dev_err(dev, "Couldn't enable the SAT clock\n"); 682 return ret; 683 } 684 685 return 0; 686 687 err_assert_reset: 688 reset_control_assert(backend->sat_reset); 689 return ret; 690 } 691 692 static int sun4i_backend_free_sat(struct device *dev) { 693 struct sun4i_backend *backend = dev_get_drvdata(dev); 694 695 clk_disable_unprepare(backend->sat_clk); 696 reset_control_assert(backend->sat_reset); 697 698 return 0; 699 } 700 701 /* 702 * The display backend can take video output from the display frontend, or 703 * the display enhancement unit on the A80, as input for one it its layers. 704 * This relationship within the display pipeline is encoded in the device 705 * tree with of_graph, and we use it here to figure out which backend, if 706 * there are 2 or more, we are currently probing. The number would be in 707 * the "reg" property of the upstream output port endpoint. 708 */ 709 static int sun4i_backend_of_get_id(struct device_node *node) 710 { 711 struct device_node *ep, *remote; 712 struct of_endpoint of_ep; 713 714 /* Input port is 0, and we want the first endpoint. */ 715 ep = of_graph_get_endpoint_by_regs(node, 0, -1); 716 if (!ep) 717 return -EINVAL; 718 719 remote = of_graph_get_remote_endpoint(ep); 720 of_node_put(ep); 721 if (!remote) 722 return -EINVAL; 723 724 of_graph_parse_endpoint(remote, &of_ep); 725 of_node_put(remote); 726 return of_ep.id; 727 } 728 729 /* TODO: This needs to take multiple pipelines into account */ 730 static struct sun4i_frontend *sun4i_backend_find_frontend(struct sun4i_drv *drv, 731 struct device_node *node) 732 { 733 struct device_node *port, *ep, *remote; 734 struct sun4i_frontend *frontend; 735 736 port = of_graph_get_port_by_id(node, 0); 737 if (!port) 738 return ERR_PTR(-EINVAL); 739 740 for_each_available_child_of_node(port, ep) { 741 remote = of_graph_get_remote_port_parent(ep); 742 if (!remote) 743 continue; 744 of_node_put(remote); 745 746 /* does this node match any registered engines? */ 747 list_for_each_entry(frontend, &drv->frontend_list, list) { 748 if (remote == frontend->node) { 749 of_node_put(port); 750 of_node_put(ep); 751 return frontend; 752 } 753 } 754 } 755 of_node_put(port); 756 return ERR_PTR(-EINVAL); 757 } 758 759 static const struct sunxi_engine_ops sun4i_backend_engine_ops = { 760 .atomic_begin = sun4i_backend_atomic_begin, 761 .atomic_check = sun4i_backend_atomic_check, 762 .commit = sun4i_backend_commit, 763 .layers_init = sun4i_layers_init, 764 .apply_color_correction = sun4i_backend_apply_color_correction, 765 .disable_color_correction = sun4i_backend_disable_color_correction, 766 .vblank_quirk = sun4i_backend_vblank_quirk, 767 .mode_set = sun4i_backend_mode_set, 768 }; 769 770 static const struct regmap_config sun4i_backend_regmap_config = { 771 .reg_bits = 32, 772 .val_bits = 32, 773 .reg_stride = 4, 774 .max_register = 0x5800, 775 }; 776 777 static int sun4i_backend_bind(struct device *dev, struct device *master, 778 void *data) 779 { 780 struct platform_device *pdev = to_platform_device(dev); 781 struct drm_device *drm = data; 782 struct sun4i_drv *drv = drm->dev_private; 783 struct sun4i_backend *backend; 784 const struct sun4i_backend_quirks *quirks; 785 void __iomem *regs; 786 int i, ret; 787 788 backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL); 789 if (!backend) 790 return -ENOMEM; 791 dev_set_drvdata(dev, backend); 792 spin_lock_init(&backend->frontend_lock); 793 794 if (of_find_property(dev->of_node, "interconnects", NULL)) { 795 /* 796 * This assume we have the same DMA constraints for all our the 797 * devices in our pipeline (all the backends, but also the 798 * frontends). This sounds bad, but it has always been the case 799 * for us, and DRM doesn't do per-device allocation either, so 800 * we would need to fix DRM first... 801 */ 802 ret = of_dma_configure(drm->dev, dev->of_node, true); 803 if (ret) 804 return ret; 805 } 806 807 backend->engine.node = dev->of_node; 808 backend->engine.ops = &sun4i_backend_engine_ops; 809 backend->engine.id = sun4i_backend_of_get_id(dev->of_node); 810 if (backend->engine.id < 0) 811 return backend->engine.id; 812 813 backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); 814 if (IS_ERR(backend->frontend)) 815 dev_warn(dev, "Couldn't find matching frontend, frontend features disabled\n"); 816 817 regs = devm_platform_ioremap_resource(pdev, 0); 818 if (IS_ERR(regs)) 819 return PTR_ERR(regs); 820 821 backend->reset = devm_reset_control_get(dev, NULL); 822 if (IS_ERR(backend->reset)) { 823 dev_err(dev, "Couldn't get our reset line\n"); 824 return PTR_ERR(backend->reset); 825 } 826 827 ret = reset_control_deassert(backend->reset); 828 if (ret) { 829 dev_err(dev, "Couldn't deassert our reset line\n"); 830 return ret; 831 } 832 833 backend->bus_clk = devm_clk_get(dev, "ahb"); 834 if (IS_ERR(backend->bus_clk)) { 835 dev_err(dev, "Couldn't get the backend bus clock\n"); 836 ret = PTR_ERR(backend->bus_clk); 837 goto err_assert_reset; 838 } 839 clk_prepare_enable(backend->bus_clk); 840 841 backend->mod_clk = devm_clk_get(dev, "mod"); 842 if (IS_ERR(backend->mod_clk)) { 843 dev_err(dev, "Couldn't get the backend module clock\n"); 844 ret = PTR_ERR(backend->mod_clk); 845 goto err_disable_bus_clk; 846 } 847 848 ret = clk_set_rate_exclusive(backend->mod_clk, 300000000); 849 if (ret) { 850 dev_err(dev, "Couldn't set the module clock frequency\n"); 851 goto err_disable_bus_clk; 852 } 853 854 clk_prepare_enable(backend->mod_clk); 855 856 backend->ram_clk = devm_clk_get(dev, "ram"); 857 if (IS_ERR(backend->ram_clk)) { 858 dev_err(dev, "Couldn't get the backend RAM clock\n"); 859 ret = PTR_ERR(backend->ram_clk); 860 goto err_disable_mod_clk; 861 } 862 clk_prepare_enable(backend->ram_clk); 863 864 if (of_device_is_compatible(dev->of_node, 865 "allwinner,sun8i-a33-display-backend")) { 866 ret = sun4i_backend_init_sat(dev); 867 if (ret) { 868 dev_err(dev, "Couldn't init SAT resources\n"); 869 goto err_disable_ram_clk; 870 } 871 } 872 873 backend->engine.regs = devm_regmap_init_mmio(dev, regs, 874 &sun4i_backend_regmap_config); 875 if (IS_ERR(backend->engine.regs)) { 876 dev_err(dev, "Couldn't create the backend regmap\n"); 877 return PTR_ERR(backend->engine.regs); 878 } 879 880 list_add_tail(&backend->engine.list, &drv->engine_list); 881 882 /* 883 * Many of the backend's layer configuration registers have 884 * undefined default values. This poses a risk as we use 885 * regmap_update_bits in some places, and don't overwrite 886 * the whole register. 887 * 888 * Clear the registers here to have something predictable. 889 */ 890 for (i = 0x800; i < 0x1000; i += 4) 891 regmap_write(backend->engine.regs, i, 0); 892 893 /* Disable registers autoloading */ 894 regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG, 895 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS); 896 897 /* Enable the backend */ 898 regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 899 SUN4I_BACKEND_MODCTL_DEBE_EN | 900 SUN4I_BACKEND_MODCTL_START_CTL); 901 902 /* Set output selection if needed */ 903 quirks = of_device_get_match_data(dev); 904 if (quirks->needs_output_muxing) { 905 /* 906 * We assume there is no dynamic muxing of backends 907 * and TCONs, so we select the backend with same ID. 908 * 909 * While dynamic selection might be interesting, since 910 * the CRTC is tied to the TCON, while the layers are 911 * tied to the backends, this means, we will need to 912 * switch between groups of layers. There might not be 913 * a way to represent this constraint in DRM. 914 */ 915 regmap_update_bits(backend->engine.regs, 916 SUN4I_BACKEND_MODCTL_REG, 917 SUN4I_BACKEND_MODCTL_OUT_SEL, 918 (backend->engine.id 919 ? SUN4I_BACKEND_MODCTL_OUT_LCD1 920 : SUN4I_BACKEND_MODCTL_OUT_LCD0)); 921 } 922 923 backend->quirks = quirks; 924 925 return 0; 926 927 err_disable_ram_clk: 928 clk_disable_unprepare(backend->ram_clk); 929 err_disable_mod_clk: 930 clk_rate_exclusive_put(backend->mod_clk); 931 clk_disable_unprepare(backend->mod_clk); 932 err_disable_bus_clk: 933 clk_disable_unprepare(backend->bus_clk); 934 err_assert_reset: 935 reset_control_assert(backend->reset); 936 return ret; 937 } 938 939 static void sun4i_backend_unbind(struct device *dev, struct device *master, 940 void *data) 941 { 942 struct sun4i_backend *backend = dev_get_drvdata(dev); 943 944 list_del(&backend->engine.list); 945 946 if (of_device_is_compatible(dev->of_node, 947 "allwinner,sun8i-a33-display-backend")) 948 sun4i_backend_free_sat(dev); 949 950 clk_disable_unprepare(backend->ram_clk); 951 clk_rate_exclusive_put(backend->mod_clk); 952 clk_disable_unprepare(backend->mod_clk); 953 clk_disable_unprepare(backend->bus_clk); 954 reset_control_assert(backend->reset); 955 } 956 957 static const struct component_ops sun4i_backend_ops = { 958 .bind = sun4i_backend_bind, 959 .unbind = sun4i_backend_unbind, 960 }; 961 962 static int sun4i_backend_probe(struct platform_device *pdev) 963 { 964 return component_add(&pdev->dev, &sun4i_backend_ops); 965 } 966 967 static int sun4i_backend_remove(struct platform_device *pdev) 968 { 969 component_del(&pdev->dev, &sun4i_backend_ops); 970 971 return 0; 972 } 973 974 static const struct sun4i_backend_quirks sun4i_backend_quirks = { 975 .needs_output_muxing = true, 976 }; 977 978 static const struct sun4i_backend_quirks sun5i_backend_quirks = { 979 }; 980 981 static const struct sun4i_backend_quirks sun6i_backend_quirks = { 982 }; 983 984 static const struct sun4i_backend_quirks sun7i_backend_quirks = { 985 .needs_output_muxing = true, 986 }; 987 988 static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = { 989 .supports_lowest_plane_alpha = true, 990 }; 991 992 static const struct sun4i_backend_quirks sun9i_backend_quirks = { 993 }; 994 995 static const struct of_device_id sun4i_backend_of_table[] = { 996 { 997 .compatible = "allwinner,sun4i-a10-display-backend", 998 .data = &sun4i_backend_quirks, 999 }, 1000 { 1001 .compatible = "allwinner,sun5i-a13-display-backend", 1002 .data = &sun5i_backend_quirks, 1003 }, 1004 { 1005 .compatible = "allwinner,sun6i-a31-display-backend", 1006 .data = &sun6i_backend_quirks, 1007 }, 1008 { 1009 .compatible = "allwinner,sun7i-a20-display-backend", 1010 .data = &sun7i_backend_quirks, 1011 }, 1012 { 1013 .compatible = "allwinner,sun8i-a23-display-backend", 1014 .data = &sun8i_a33_backend_quirks, 1015 }, 1016 { 1017 .compatible = "allwinner,sun8i-a33-display-backend", 1018 .data = &sun8i_a33_backend_quirks, 1019 }, 1020 { 1021 .compatible = "allwinner,sun9i-a80-display-backend", 1022 .data = &sun9i_backend_quirks, 1023 }, 1024 { } 1025 }; 1026 MODULE_DEVICE_TABLE(of, sun4i_backend_of_table); 1027 1028 static struct platform_driver sun4i_backend_platform_driver = { 1029 .probe = sun4i_backend_probe, 1030 .remove = sun4i_backend_remove, 1031 .driver = { 1032 .name = "sun4i-backend", 1033 .of_match_table = sun4i_backend_of_table, 1034 }, 1035 }; 1036 module_platform_driver(sun4i_backend_platform_driver); 1037 1038 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 1039 MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver"); 1040 MODULE_LICENSE("GPL"); 1041