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_blend.h> 21 #include <drm/drm_crtc.h> 22 #include <drm/drm_fb_dma_helper.h> 23 #include <drm/drm_fourcc.h> 24 #include <drm/drm_framebuffer.h> 25 #include <drm/drm_gem_dma_helper.h> 26 #include <drm/drm_probe_helper.h> 27 28 #include "sun4i_backend.h" 29 #include "sun4i_drv.h" 30 #include "sun4i_frontend.h" 31 #include "sun4i_layer.h" 32 #include "sunxi_engine.h" 33 34 struct sun4i_backend_quirks { 35 /* backend <-> TCON muxing selection done in backend */ 36 bool needs_output_muxing; 37 38 /* alpha at the lowest z position is not always supported */ 39 bool supports_lowest_plane_alpha; 40 }; 41 42 static const u32 sunxi_rgb2yuv_coef[12] = { 43 0x00000107, 0x00000204, 0x00000064, 0x00000108, 44 0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808, 45 0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808 46 }; 47 48 static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine) 49 { 50 int i; 51 52 DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n"); 53 54 /* Set color correction */ 55 regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG, 56 SUN4I_BACKEND_OCCTL_ENABLE); 57 58 for (i = 0; i < 12; i++) 59 regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i), 60 sunxi_rgb2yuv_coef[i]); 61 } 62 63 static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine) 64 { 65 DRM_DEBUG_DRIVER("Disabling color correction\n"); 66 67 /* Disable color correction */ 68 regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG, 69 SUN4I_BACKEND_OCCTL_ENABLE, 0); 70 } 71 72 static void sun4i_backend_commit(struct sunxi_engine *engine) 73 { 74 DRM_DEBUG_DRIVER("Committing changes\n"); 75 76 regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG, 77 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS | 78 SUN4I_BACKEND_REGBUFFCTL_LOADCTL); 79 } 80 81 void sun4i_backend_layer_enable(struct sun4i_backend *backend, 82 int layer, bool enable) 83 { 84 u32 val; 85 86 DRM_DEBUG_DRIVER("%sabling layer %d\n", enable ? "En" : "Dis", 87 layer); 88 89 if (enable) 90 val = SUN4I_BACKEND_MODCTL_LAY_EN(layer); 91 else 92 val = 0; 93 94 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 95 SUN4I_BACKEND_MODCTL_LAY_EN(layer), val); 96 } 97 98 static int sun4i_backend_drm_format_to_layer(u32 format, u32 *mode) 99 { 100 switch (format) { 101 case DRM_FORMAT_ARGB8888: 102 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888; 103 break; 104 105 case DRM_FORMAT_ARGB4444: 106 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444; 107 break; 108 109 case DRM_FORMAT_ARGB1555: 110 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555; 111 break; 112 113 case DRM_FORMAT_RGBA5551: 114 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551; 115 break; 116 117 case DRM_FORMAT_RGBA4444: 118 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444; 119 break; 120 121 case DRM_FORMAT_XRGB8888: 122 *mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888; 123 break; 124 125 case DRM_FORMAT_RGB888: 126 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB888; 127 break; 128 129 case DRM_FORMAT_RGB565: 130 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB565; 131 break; 132 133 default: 134 return -EINVAL; 135 } 136 137 return 0; 138 } 139 140 static const uint32_t sun4i_backend_formats[] = { 141 DRM_FORMAT_ARGB1555, 142 DRM_FORMAT_ARGB4444, 143 DRM_FORMAT_ARGB8888, 144 DRM_FORMAT_RGB565, 145 DRM_FORMAT_RGB888, 146 DRM_FORMAT_RGBA4444, 147 DRM_FORMAT_RGBA5551, 148 DRM_FORMAT_UYVY, 149 DRM_FORMAT_VYUY, 150 DRM_FORMAT_XRGB8888, 151 DRM_FORMAT_YUYV, 152 DRM_FORMAT_YVYU, 153 }; 154 155 bool sun4i_backend_format_is_supported(uint32_t fmt, uint64_t modifier) 156 { 157 unsigned int i; 158 159 if (modifier != DRM_FORMAT_MOD_LINEAR) 160 return false; 161 162 for (i = 0; i < ARRAY_SIZE(sun4i_backend_formats); i++) 163 if (sun4i_backend_formats[i] == fmt) 164 return true; 165 166 return false; 167 } 168 169 int sun4i_backend_update_layer_coord(struct sun4i_backend *backend, 170 int layer, struct drm_plane *plane) 171 { 172 struct drm_plane_state *state = plane->state; 173 174 DRM_DEBUG_DRIVER("Updating layer %d\n", layer); 175 176 /* Set height and width */ 177 DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n", 178 state->crtc_w, state->crtc_h); 179 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer), 180 SUN4I_BACKEND_LAYSIZE(state->crtc_w, 181 state->crtc_h)); 182 183 /* Set base coordinates */ 184 DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n", 185 state->crtc_x, state->crtc_y); 186 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer), 187 SUN4I_BACKEND_LAYCOOR(state->crtc_x, 188 state->crtc_y)); 189 190 return 0; 191 } 192 193 static int sun4i_backend_update_yuv_format(struct sun4i_backend *backend, 194 int layer, struct drm_plane *plane) 195 { 196 struct drm_plane_state *state = plane->state; 197 struct drm_framebuffer *fb = state->fb; 198 const struct drm_format_info *format = fb->format; 199 const uint32_t fmt = format->format; 200 u32 val = SUN4I_BACKEND_IYUVCTL_EN; 201 int i; 202 203 for (i = 0; i < ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef); i++) 204 regmap_write(backend->engine.regs, 205 SUN4I_BACKEND_YGCOEF_REG(i), 206 sunxi_bt601_yuv2rgb_coef[i]); 207 208 /* 209 * We should do that only for a single plane, but the 210 * framebuffer's atomic_check has our back on this. 211 */ 212 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 213 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 214 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN); 215 216 /* TODO: Add support for the multi-planar YUV formats */ 217 if (drm_format_info_is_yuv_packed(format) && 218 drm_format_info_is_yuv_sampling_422(format)) 219 val |= SUN4I_BACKEND_IYUVCTL_FBFMT_PACKED_YUV422; 220 else 221 DRM_DEBUG_DRIVER("Unsupported YUV format (0x%x)\n", fmt); 222 223 /* 224 * Allwinner seems to list the pixel sequence from right to left, while 225 * DRM lists it from left to right. 226 */ 227 switch (fmt) { 228 case DRM_FORMAT_YUYV: 229 val |= SUN4I_BACKEND_IYUVCTL_FBPS_VYUY; 230 break; 231 case DRM_FORMAT_YVYU: 232 val |= SUN4I_BACKEND_IYUVCTL_FBPS_UYVY; 233 break; 234 case DRM_FORMAT_UYVY: 235 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YVYU; 236 break; 237 case DRM_FORMAT_VYUY: 238 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YUYV; 239 break; 240 default: 241 DRM_DEBUG_DRIVER("Unsupported YUV pixel sequence (0x%x)\n", 242 fmt); 243 } 244 245 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVCTL_REG, val); 246 247 return 0; 248 } 249 250 int sun4i_backend_update_layer_formats(struct sun4i_backend *backend, 251 int layer, struct drm_plane *plane) 252 { 253 struct drm_plane_state *state = plane->state; 254 struct drm_framebuffer *fb = state->fb; 255 u32 val; 256 int ret; 257 258 /* Clear the YUV mode */ 259 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 260 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0); 261 262 val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >> 8); 263 if (state->alpha != DRM_BLEND_ALPHA_OPAQUE) 264 val |= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN; 265 regmap_update_bits(backend->engine.regs, 266 SUN4I_BACKEND_ATTCTL_REG0(layer), 267 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK | 268 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN, 269 val); 270 271 if (fb->format->is_yuv) 272 return sun4i_backend_update_yuv_format(backend, layer, plane); 273 274 ret = sun4i_backend_drm_format_to_layer(fb->format->format, &val); 275 if (ret) { 276 DRM_DEBUG_DRIVER("Invalid format\n"); 277 return ret; 278 } 279 280 regmap_update_bits(backend->engine.regs, 281 SUN4I_BACKEND_ATTCTL_REG1(layer), 282 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); 283 284 return 0; 285 } 286 287 int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend, 288 int layer, uint32_t fmt) 289 { 290 u32 val; 291 int ret; 292 293 ret = sun4i_backend_drm_format_to_layer(fmt, &val); 294 if (ret) { 295 DRM_DEBUG_DRIVER("Invalid format\n"); 296 return ret; 297 } 298 299 regmap_update_bits(backend->engine.regs, 300 SUN4I_BACKEND_ATTCTL_REG0(layer), 301 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN, 302 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN); 303 304 regmap_update_bits(backend->engine.regs, 305 SUN4I_BACKEND_ATTCTL_REG1(layer), 306 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); 307 308 return 0; 309 } 310 311 static int sun4i_backend_update_yuv_buffer(struct sun4i_backend *backend, 312 struct drm_framebuffer *fb, 313 dma_addr_t paddr) 314 { 315 /* TODO: Add support for the multi-planar YUV formats */ 316 DRM_DEBUG_DRIVER("Setting packed YUV buffer address to %pad\n", &paddr); 317 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVADD_REG(0), paddr); 318 319 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); 320 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVLINEWIDTH_REG(0), 321 fb->pitches[0] * 8); 322 323 return 0; 324 } 325 326 int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend, 327 int layer, struct drm_plane *plane) 328 { 329 struct drm_plane_state *state = plane->state; 330 struct drm_framebuffer *fb = state->fb; 331 u32 lo_paddr, hi_paddr; 332 dma_addr_t dma_addr; 333 334 /* Set the line width */ 335 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); 336 regmap_write(backend->engine.regs, 337 SUN4I_BACKEND_LAYLINEWIDTH_REG(layer), 338 fb->pitches[0] * 8); 339 340 /* Get the start of the displayed memory */ 341 dma_addr = drm_fb_dma_get_gem_addr(fb, state, 0); 342 DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &dma_addr); 343 344 if (fb->format->is_yuv) 345 return sun4i_backend_update_yuv_buffer(backend, fb, dma_addr); 346 347 /* Write the 32 lower bits of the address (in bits) */ 348 lo_paddr = dma_addr << 3; 349 DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr); 350 regmap_write(backend->engine.regs, 351 SUN4I_BACKEND_LAYFB_L32ADD_REG(layer), 352 lo_paddr); 353 354 /* And the upper bits */ 355 hi_paddr = dma_addr >> 29; 356 DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr); 357 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG, 358 SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer), 359 SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr)); 360 361 return 0; 362 } 363 364 int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer, 365 struct drm_plane *plane) 366 { 367 struct drm_plane_state *state = plane->state; 368 struct sun4i_layer_state *p_state = state_to_sun4i_layer_state(state); 369 unsigned int priority = state->normalized_zpos; 370 unsigned int pipe = p_state->pipe; 371 372 DRM_DEBUG_DRIVER("Setting layer %d's priority to %d and pipe %d\n", 373 layer, priority, pipe); 374 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 375 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK | 376 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK, 377 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(p_state->pipe) | 378 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority)); 379 380 return 0; 381 } 382 383 void sun4i_backend_cleanup_layer(struct sun4i_backend *backend, 384 int layer) 385 { 386 regmap_update_bits(backend->engine.regs, 387 SUN4I_BACKEND_ATTCTL_REG0(layer), 388 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN | 389 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0); 390 } 391 392 static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state) 393 { 394 u16 src_h = state->src_h >> 16; 395 u16 src_w = state->src_w >> 16; 396 397 DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n", 398 src_w, src_h, state->crtc_w, state->crtc_h); 399 400 if ((state->crtc_h != src_h) || (state->crtc_w != src_w)) 401 return true; 402 403 return false; 404 } 405 406 static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state) 407 { 408 struct sun4i_layer *layer = plane_to_sun4i_layer(state->plane); 409 struct sun4i_backend *backend = layer->backend; 410 uint32_t format = state->fb->format->format; 411 uint64_t modifier = state->fb->modifier; 412 413 if (IS_ERR(backend->frontend)) 414 return false; 415 416 if (!sun4i_frontend_format_is_supported(format, modifier)) 417 return false; 418 419 if (!sun4i_backend_format_is_supported(format, modifier)) 420 return true; 421 422 /* 423 * TODO: The backend alone allows 2x and 4x integer scaling, including 424 * support for an alpha component (which the frontend doesn't support). 425 * Use the backend directly instead of the frontend in this case, with 426 * another test to return false. 427 */ 428 429 if (sun4i_backend_plane_uses_scaler(state)) 430 return true; 431 432 /* 433 * Here the format is supported by both the frontend and the backend 434 * and no frontend scaling is required, so use the backend directly. 435 */ 436 return false; 437 } 438 439 static bool sun4i_backend_plane_is_supported(struct drm_plane_state *state, 440 bool *uses_frontend) 441 { 442 if (sun4i_backend_plane_uses_frontend(state)) { 443 *uses_frontend = true; 444 return true; 445 } 446 447 *uses_frontend = false; 448 449 /* Scaling is not supported without the frontend. */ 450 if (sun4i_backend_plane_uses_scaler(state)) 451 return false; 452 453 return true; 454 } 455 456 static void sun4i_backend_atomic_begin(struct sunxi_engine *engine, 457 struct drm_crtc_state *old_state) 458 { 459 u32 val; 460 461 WARN_ON(regmap_read_poll_timeout(engine->regs, 462 SUN4I_BACKEND_REGBUFFCTL_REG, 463 val, !(val & SUN4I_BACKEND_REGBUFFCTL_LOADCTL), 464 100, 50000)); 465 } 466 467 static int sun4i_backend_atomic_check(struct sunxi_engine *engine, 468 struct drm_crtc_state *crtc_state) 469 { 470 struct drm_plane_state *plane_states[SUN4I_BACKEND_NUM_LAYERS] = { 0 }; 471 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 472 struct drm_atomic_state *state = crtc_state->state; 473 struct drm_device *drm = state->dev; 474 struct drm_plane *plane; 475 unsigned int num_planes = 0; 476 unsigned int num_alpha_planes = 0; 477 unsigned int num_frontend_planes = 0; 478 unsigned int num_alpha_planes_max = 1; 479 unsigned int num_yuv_planes = 0; 480 unsigned int current_pipe = 0; 481 unsigned int i; 482 483 DRM_DEBUG_DRIVER("Starting checking our planes\n"); 484 485 if (!crtc_state->planes_changed) 486 return 0; 487 488 drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) { 489 struct drm_plane_state *plane_state = 490 drm_atomic_get_plane_state(state, plane); 491 struct sun4i_layer_state *layer_state = 492 state_to_sun4i_layer_state(plane_state); 493 struct drm_framebuffer *fb = plane_state->fb; 494 495 if (!sun4i_backend_plane_is_supported(plane_state, 496 &layer_state->uses_frontend)) 497 return -EINVAL; 498 499 if (layer_state->uses_frontend) { 500 DRM_DEBUG_DRIVER("Using the frontend for plane %d\n", 501 plane->index); 502 num_frontend_planes++; 503 } else { 504 if (fb->format->is_yuv) { 505 DRM_DEBUG_DRIVER("Plane FB format is YUV\n"); 506 num_yuv_planes++; 507 } 508 } 509 510 DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n", 511 &fb->format->format); 512 if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 513 num_alpha_planes++; 514 515 DRM_DEBUG_DRIVER("Plane zpos is %d\n", 516 plane_state->normalized_zpos); 517 518 /* Sort our planes by Zpos */ 519 plane_states[plane_state->normalized_zpos] = plane_state; 520 521 num_planes++; 522 } 523 524 /* All our planes were disabled, bail out */ 525 if (!num_planes) 526 return 0; 527 528 /* 529 * The hardware is a bit unusual here. 530 * 531 * Even though it supports 4 layers, it does the composition 532 * in two separate steps. 533 * 534 * The first one is assigning a layer to one of its two 535 * pipes. If more that 1 layer is assigned to the same pipe, 536 * and if pixels overlaps, the pipe will take the pixel from 537 * the layer with the highest priority. 538 * 539 * The second step is the actual alpha blending, that takes 540 * the two pipes as input, and uses the potential alpha 541 * component to do the transparency between the two. 542 * 543 * This two-step scenario makes us unable to guarantee a 544 * robust alpha blending between the 4 layers in all 545 * situations, since this means that we need to have one layer 546 * with alpha at the lowest position of our two pipes. 547 * 548 * However, we cannot even do that on every platform, since 549 * the hardware has a bug where the lowest plane of the lowest 550 * pipe (pipe 0, priority 0), if it has any alpha, will 551 * discard the pixel data entirely and just display the pixels 552 * in the background color (black by default). 553 * 554 * This means that on the affected platforms, we effectively 555 * have only three valid configurations with alpha, all of 556 * them with the alpha being on pipe1 with the lowest 557 * position, which can be 1, 2 or 3 depending on the number of 558 * planes and their zpos. 559 */ 560 561 /* For platforms that are not affected by the issue described above. */ 562 if (backend->quirks->supports_lowest_plane_alpha) 563 num_alpha_planes_max++; 564 565 if (num_alpha_planes > num_alpha_planes_max) { 566 DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n"); 567 return -EINVAL; 568 } 569 570 /* We can't have an alpha plane at the lowest position */ 571 if (!backend->quirks->supports_lowest_plane_alpha && 572 (plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE)) 573 return -EINVAL; 574 575 for (i = 1; i < num_planes; i++) { 576 struct drm_plane_state *p_state = plane_states[i]; 577 struct drm_framebuffer *fb = p_state->fb; 578 struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(p_state); 579 580 /* 581 * The only alpha position is the lowest plane of the 582 * second pipe. 583 */ 584 if (fb->format->has_alpha || (p_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 585 current_pipe++; 586 587 s_state->pipe = current_pipe; 588 } 589 590 /* We can only have a single YUV plane at a time */ 591 if (num_yuv_planes > SUN4I_BACKEND_NUM_YUV_PLANES) { 592 DRM_DEBUG_DRIVER("Too many planes with YUV, rejecting...\n"); 593 return -EINVAL; 594 } 595 596 if (num_frontend_planes > SUN4I_BACKEND_NUM_FRONTEND_LAYERS) { 597 DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n"); 598 return -EINVAL; 599 } 600 601 DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n", 602 num_planes, num_alpha_planes, num_frontend_planes, 603 num_yuv_planes); 604 605 return 0; 606 } 607 608 static void sun4i_backend_vblank_quirk(struct sunxi_engine *engine) 609 { 610 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 611 struct sun4i_frontend *frontend = backend->frontend; 612 613 if (!frontend) 614 return; 615 616 /* 617 * In a teardown scenario with the frontend involved, we have 618 * to keep the frontend enabled until the next vblank, and 619 * only then disable it. 620 * 621 * This is due to the fact that the backend will not take into 622 * account the new configuration (with the plane that used to 623 * be fed by the frontend now disabled) until we write to the 624 * commit bit and the hardware fetches the new configuration 625 * during the next vblank. 626 * 627 * So we keep the frontend around in order to prevent any 628 * visual artifacts. 629 */ 630 spin_lock(&backend->frontend_lock); 631 if (backend->frontend_teardown) { 632 sun4i_frontend_exit(frontend); 633 backend->frontend_teardown = false; 634 } 635 spin_unlock(&backend->frontend_lock); 636 }; 637 638 static void sun4i_backend_mode_set(struct sunxi_engine *engine, 639 const struct drm_display_mode *mode) 640 { 641 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 642 643 DRM_DEBUG_DRIVER("Updating global size W: %u H: %u\n", 644 mode->hdisplay, mode->vdisplay); 645 646 regmap_write(engine->regs, SUN4I_BACKEND_DISSIZE_REG, 647 SUN4I_BACKEND_DISSIZE(mode->hdisplay, mode->vdisplay)); 648 649 regmap_update_bits(engine->regs, SUN4I_BACKEND_MODCTL_REG, 650 SUN4I_BACKEND_MODCTL_ITLMOD_EN, 651 interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0); 652 653 DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n", 654 interlaced ? "on" : "off"); 655 } 656 657 static int sun4i_backend_init_sat(struct device *dev) { 658 struct sun4i_backend *backend = dev_get_drvdata(dev); 659 int ret; 660 661 backend->sat_reset = devm_reset_control_get(dev, "sat"); 662 if (IS_ERR(backend->sat_reset)) { 663 dev_err(dev, "Couldn't get the SAT reset line\n"); 664 return PTR_ERR(backend->sat_reset); 665 } 666 667 ret = reset_control_deassert(backend->sat_reset); 668 if (ret) { 669 dev_err(dev, "Couldn't deassert the SAT reset line\n"); 670 return ret; 671 } 672 673 backend->sat_clk = devm_clk_get(dev, "sat"); 674 if (IS_ERR(backend->sat_clk)) { 675 dev_err(dev, "Couldn't get our SAT clock\n"); 676 ret = PTR_ERR(backend->sat_clk); 677 goto err_assert_reset; 678 } 679 680 ret = clk_prepare_enable(backend->sat_clk); 681 if (ret) { 682 dev_err(dev, "Couldn't enable the SAT clock\n"); 683 return ret; 684 } 685 686 return 0; 687 688 err_assert_reset: 689 reset_control_assert(backend->sat_reset); 690 return ret; 691 } 692 693 static int sun4i_backend_free_sat(struct device *dev) { 694 struct sun4i_backend *backend = dev_get_drvdata(dev); 695 696 clk_disable_unprepare(backend->sat_clk); 697 reset_control_assert(backend->sat_reset); 698 699 return 0; 700 } 701 702 /* 703 * The display backend can take video output from the display frontend, or 704 * the display enhancement unit on the A80, as input for one it its layers. 705 * This relationship within the display pipeline is encoded in the device 706 * tree with of_graph, and we use it here to figure out which backend, if 707 * there are 2 or more, we are currently probing. The number would be in 708 * the "reg" property of the upstream output port endpoint. 709 */ 710 static int sun4i_backend_of_get_id(struct device_node *node) 711 { 712 struct device_node *ep, *remote; 713 struct of_endpoint of_ep; 714 715 /* Input port is 0, and we want the first endpoint. */ 716 ep = of_graph_get_endpoint_by_regs(node, 0, -1); 717 if (!ep) 718 return -EINVAL; 719 720 remote = of_graph_get_remote_endpoint(ep); 721 of_node_put(ep); 722 if (!remote) 723 return -EINVAL; 724 725 of_graph_parse_endpoint(remote, &of_ep); 726 of_node_put(remote); 727 return of_ep.id; 728 } 729 730 /* TODO: This needs to take multiple pipelines into account */ 731 static struct sun4i_frontend *sun4i_backend_find_frontend(struct sun4i_drv *drv, 732 struct device_node *node) 733 { 734 struct device_node *port, *ep, *remote; 735 struct sun4i_frontend *frontend; 736 737 port = of_graph_get_port_by_id(node, 0); 738 if (!port) 739 return ERR_PTR(-EINVAL); 740 741 for_each_available_child_of_node(port, ep) { 742 remote = of_graph_get_remote_port_parent(ep); 743 if (!remote) 744 continue; 745 of_node_put(remote); 746 747 /* does this node match any registered engines? */ 748 list_for_each_entry(frontend, &drv->frontend_list, list) { 749 if (remote == frontend->node) { 750 of_node_put(port); 751 of_node_put(ep); 752 return frontend; 753 } 754 } 755 } 756 of_node_put(port); 757 return ERR_PTR(-EINVAL); 758 } 759 760 static const struct sunxi_engine_ops sun4i_backend_engine_ops = { 761 .atomic_begin = sun4i_backend_atomic_begin, 762 .atomic_check = sun4i_backend_atomic_check, 763 .commit = sun4i_backend_commit, 764 .layers_init = sun4i_layers_init, 765 .apply_color_correction = sun4i_backend_apply_color_correction, 766 .disable_color_correction = sun4i_backend_disable_color_correction, 767 .vblank_quirk = sun4i_backend_vblank_quirk, 768 .mode_set = sun4i_backend_mode_set, 769 }; 770 771 static const struct regmap_config sun4i_backend_regmap_config = { 772 .reg_bits = 32, 773 .val_bits = 32, 774 .reg_stride = 4, 775 .max_register = 0x5800, 776 }; 777 778 static int sun4i_backend_bind(struct device *dev, struct device *master, 779 void *data) 780 { 781 struct platform_device *pdev = to_platform_device(dev); 782 struct drm_device *drm = data; 783 struct sun4i_drv *drv = drm->dev_private; 784 struct sun4i_backend *backend; 785 const struct sun4i_backend_quirks *quirks; 786 void __iomem *regs; 787 int i, ret; 788 789 backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL); 790 if (!backend) 791 return -ENOMEM; 792 dev_set_drvdata(dev, backend); 793 spin_lock_init(&backend->frontend_lock); 794 795 if (of_find_property(dev->of_node, "interconnects", NULL)) { 796 /* 797 * This assume we have the same DMA constraints for all our the 798 * devices in our pipeline (all the backends, but also the 799 * frontends). This sounds bad, but it has always been the case 800 * for us, and DRM doesn't do per-device allocation either, so 801 * we would need to fix DRM first... 802 */ 803 ret = of_dma_configure(drm->dev, dev->of_node, true); 804 if (ret) 805 return ret; 806 } 807 808 backend->engine.node = dev->of_node; 809 backend->engine.ops = &sun4i_backend_engine_ops; 810 backend->engine.id = sun4i_backend_of_get_id(dev->of_node); 811 if (backend->engine.id < 0) 812 return backend->engine.id; 813 814 backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); 815 if (IS_ERR(backend->frontend)) 816 dev_warn(dev, "Couldn't find matching frontend, frontend features disabled\n"); 817 818 regs = devm_platform_ioremap_resource(pdev, 0); 819 if (IS_ERR(regs)) 820 return PTR_ERR(regs); 821 822 backend->reset = devm_reset_control_get(dev, NULL); 823 if (IS_ERR(backend->reset)) { 824 dev_err(dev, "Couldn't get our reset line\n"); 825 return PTR_ERR(backend->reset); 826 } 827 828 ret = reset_control_deassert(backend->reset); 829 if (ret) { 830 dev_err(dev, "Couldn't deassert our reset line\n"); 831 return ret; 832 } 833 834 backend->bus_clk = devm_clk_get(dev, "ahb"); 835 if (IS_ERR(backend->bus_clk)) { 836 dev_err(dev, "Couldn't get the backend bus clock\n"); 837 ret = PTR_ERR(backend->bus_clk); 838 goto err_assert_reset; 839 } 840 clk_prepare_enable(backend->bus_clk); 841 842 backend->mod_clk = devm_clk_get(dev, "mod"); 843 if (IS_ERR(backend->mod_clk)) { 844 dev_err(dev, "Couldn't get the backend module clock\n"); 845 ret = PTR_ERR(backend->mod_clk); 846 goto err_disable_bus_clk; 847 } 848 849 ret = clk_set_rate_exclusive(backend->mod_clk, 300000000); 850 if (ret) { 851 dev_err(dev, "Couldn't set the module clock frequency\n"); 852 goto err_disable_bus_clk; 853 } 854 855 clk_prepare_enable(backend->mod_clk); 856 857 backend->ram_clk = devm_clk_get(dev, "ram"); 858 if (IS_ERR(backend->ram_clk)) { 859 dev_err(dev, "Couldn't get the backend RAM clock\n"); 860 ret = PTR_ERR(backend->ram_clk); 861 goto err_disable_mod_clk; 862 } 863 clk_prepare_enable(backend->ram_clk); 864 865 if (of_device_is_compatible(dev->of_node, 866 "allwinner,sun8i-a33-display-backend")) { 867 ret = sun4i_backend_init_sat(dev); 868 if (ret) { 869 dev_err(dev, "Couldn't init SAT resources\n"); 870 goto err_disable_ram_clk; 871 } 872 } 873 874 backend->engine.regs = devm_regmap_init_mmio(dev, regs, 875 &sun4i_backend_regmap_config); 876 if (IS_ERR(backend->engine.regs)) { 877 dev_err(dev, "Couldn't create the backend regmap\n"); 878 return PTR_ERR(backend->engine.regs); 879 } 880 881 list_add_tail(&backend->engine.list, &drv->engine_list); 882 883 /* 884 * Many of the backend's layer configuration registers have 885 * undefined default values. This poses a risk as we use 886 * regmap_update_bits in some places, and don't overwrite 887 * the whole register. 888 * 889 * Clear the registers here to have something predictable. 890 */ 891 for (i = 0x800; i < 0x1000; i += 4) 892 regmap_write(backend->engine.regs, i, 0); 893 894 /* Disable registers autoloading */ 895 regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG, 896 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS); 897 898 /* Enable the backend */ 899 regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 900 SUN4I_BACKEND_MODCTL_DEBE_EN | 901 SUN4I_BACKEND_MODCTL_START_CTL); 902 903 /* Set output selection if needed */ 904 quirks = of_device_get_match_data(dev); 905 if (quirks->needs_output_muxing) { 906 /* 907 * We assume there is no dynamic muxing of backends 908 * and TCONs, so we select the backend with same ID. 909 * 910 * While dynamic selection might be interesting, since 911 * the CRTC is tied to the TCON, while the layers are 912 * tied to the backends, this means, we will need to 913 * switch between groups of layers. There might not be 914 * a way to represent this constraint in DRM. 915 */ 916 regmap_update_bits(backend->engine.regs, 917 SUN4I_BACKEND_MODCTL_REG, 918 SUN4I_BACKEND_MODCTL_OUT_SEL, 919 (backend->engine.id 920 ? SUN4I_BACKEND_MODCTL_OUT_LCD1 921 : SUN4I_BACKEND_MODCTL_OUT_LCD0)); 922 } 923 924 backend->quirks = quirks; 925 926 return 0; 927 928 err_disable_ram_clk: 929 clk_disable_unprepare(backend->ram_clk); 930 err_disable_mod_clk: 931 clk_rate_exclusive_put(backend->mod_clk); 932 clk_disable_unprepare(backend->mod_clk); 933 err_disable_bus_clk: 934 clk_disable_unprepare(backend->bus_clk); 935 err_assert_reset: 936 reset_control_assert(backend->reset); 937 return ret; 938 } 939 940 static void sun4i_backend_unbind(struct device *dev, struct device *master, 941 void *data) 942 { 943 struct sun4i_backend *backend = dev_get_drvdata(dev); 944 945 list_del(&backend->engine.list); 946 947 if (of_device_is_compatible(dev->of_node, 948 "allwinner,sun8i-a33-display-backend")) 949 sun4i_backend_free_sat(dev); 950 951 clk_disable_unprepare(backend->ram_clk); 952 clk_rate_exclusive_put(backend->mod_clk); 953 clk_disable_unprepare(backend->mod_clk); 954 clk_disable_unprepare(backend->bus_clk); 955 reset_control_assert(backend->reset); 956 } 957 958 static const struct component_ops sun4i_backend_ops = { 959 .bind = sun4i_backend_bind, 960 .unbind = sun4i_backend_unbind, 961 }; 962 963 static int sun4i_backend_probe(struct platform_device *pdev) 964 { 965 return component_add(&pdev->dev, &sun4i_backend_ops); 966 } 967 968 static int sun4i_backend_remove(struct platform_device *pdev) 969 { 970 component_del(&pdev->dev, &sun4i_backend_ops); 971 972 return 0; 973 } 974 975 static const struct sun4i_backend_quirks sun4i_backend_quirks = { 976 .needs_output_muxing = true, 977 }; 978 979 static const struct sun4i_backend_quirks sun5i_backend_quirks = { 980 }; 981 982 static const struct sun4i_backend_quirks sun6i_backend_quirks = { 983 }; 984 985 static const struct sun4i_backend_quirks sun7i_backend_quirks = { 986 .needs_output_muxing = true, 987 }; 988 989 static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = { 990 .supports_lowest_plane_alpha = true, 991 }; 992 993 static const struct sun4i_backend_quirks sun9i_backend_quirks = { 994 }; 995 996 static const struct of_device_id sun4i_backend_of_table[] = { 997 { 998 .compatible = "allwinner,sun4i-a10-display-backend", 999 .data = &sun4i_backend_quirks, 1000 }, 1001 { 1002 .compatible = "allwinner,sun5i-a13-display-backend", 1003 .data = &sun5i_backend_quirks, 1004 }, 1005 { 1006 .compatible = "allwinner,sun6i-a31-display-backend", 1007 .data = &sun6i_backend_quirks, 1008 }, 1009 { 1010 .compatible = "allwinner,sun7i-a20-display-backend", 1011 .data = &sun7i_backend_quirks, 1012 }, 1013 { 1014 .compatible = "allwinner,sun8i-a23-display-backend", 1015 .data = &sun8i_a33_backend_quirks, 1016 }, 1017 { 1018 .compatible = "allwinner,sun8i-a33-display-backend", 1019 .data = &sun8i_a33_backend_quirks, 1020 }, 1021 { 1022 .compatible = "allwinner,sun9i-a80-display-backend", 1023 .data = &sun9i_backend_quirks, 1024 }, 1025 { } 1026 }; 1027 MODULE_DEVICE_TABLE(of, sun4i_backend_of_table); 1028 1029 static struct platform_driver sun4i_backend_platform_driver = { 1030 .probe = sun4i_backend_probe, 1031 .remove = sun4i_backend_remove, 1032 .driver = { 1033 .name = "sun4i-backend", 1034 .of_match_table = sun4i_backend_of_table, 1035 }, 1036 }; 1037 module_platform_driver(sun4i_backend_platform_driver); 1038 1039 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 1040 MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver"); 1041 MODULE_LICENSE("GPL"); 1042