1 /* 2 * Copyright (C) 2015 Free Electrons 3 * Copyright (C) 2015 NextThing Co 4 * 5 * Maxime Ripard <maxime.ripard@free-electrons.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 */ 12 13 #include <drm/drmP.h> 14 #include <drm/drm_atomic.h> 15 #include <drm/drm_atomic_helper.h> 16 #include <drm/drm_crtc.h> 17 #include <drm/drm_fb_cma_helper.h> 18 #include <drm/drm_gem_cma_helper.h> 19 #include <drm/drm_plane_helper.h> 20 #include <drm/drm_probe_helper.h> 21 22 #include <linux/component.h> 23 #include <linux/list.h> 24 #include <linux/of_device.h> 25 #include <linux/of_graph.h> 26 #include <linux/reset.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 if (plane->type == DRM_PLANE_TYPE_PRIMARY) { 177 DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n", 178 state->crtc_w, state->crtc_h); 179 regmap_write(backend->engine.regs, SUN4I_BACKEND_DISSIZE_REG, 180 SUN4I_BACKEND_DISSIZE(state->crtc_w, 181 state->crtc_h)); 182 } 183 184 /* Set height and width */ 185 DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n", 186 state->crtc_w, state->crtc_h); 187 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer), 188 SUN4I_BACKEND_LAYSIZE(state->crtc_w, 189 state->crtc_h)); 190 191 /* Set base coordinates */ 192 DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n", 193 state->crtc_x, state->crtc_y); 194 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer), 195 SUN4I_BACKEND_LAYCOOR(state->crtc_x, 196 state->crtc_y)); 197 198 return 0; 199 } 200 201 static int sun4i_backend_update_yuv_format(struct sun4i_backend *backend, 202 int layer, struct drm_plane *plane) 203 { 204 struct drm_plane_state *state = plane->state; 205 struct drm_framebuffer *fb = state->fb; 206 const struct drm_format_info *format = fb->format; 207 const uint32_t fmt = format->format; 208 u32 val = SUN4I_BACKEND_IYUVCTL_EN; 209 int i; 210 211 for (i = 0; i < ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef); i++) 212 regmap_write(backend->engine.regs, 213 SUN4I_BACKEND_YGCOEF_REG(i), 214 sunxi_bt601_yuv2rgb_coef[i]); 215 216 /* 217 * We should do that only for a single plane, but the 218 * framebuffer's atomic_check has our back on this. 219 */ 220 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 221 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 222 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN); 223 224 /* TODO: Add support for the multi-planar YUV formats */ 225 if (drm_format_info_is_yuv_packed(format) && 226 drm_format_info_is_yuv_sampling_422(format)) 227 val |= SUN4I_BACKEND_IYUVCTL_FBFMT_PACKED_YUV422; 228 else 229 DRM_DEBUG_DRIVER("Unsupported YUV format (0x%x)\n", fmt); 230 231 /* 232 * Allwinner seems to list the pixel sequence from right to left, while 233 * DRM lists it from left to right. 234 */ 235 switch (fmt) { 236 case DRM_FORMAT_YUYV: 237 val |= SUN4I_BACKEND_IYUVCTL_FBPS_VYUY; 238 break; 239 case DRM_FORMAT_YVYU: 240 val |= SUN4I_BACKEND_IYUVCTL_FBPS_UYVY; 241 break; 242 case DRM_FORMAT_UYVY: 243 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YVYU; 244 break; 245 case DRM_FORMAT_VYUY: 246 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YUYV; 247 break; 248 default: 249 DRM_DEBUG_DRIVER("Unsupported YUV pixel sequence (0x%x)\n", 250 fmt); 251 } 252 253 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVCTL_REG, val); 254 255 return 0; 256 } 257 258 int sun4i_backend_update_layer_formats(struct sun4i_backend *backend, 259 int layer, struct drm_plane *plane) 260 { 261 struct drm_plane_state *state = plane->state; 262 struct drm_framebuffer *fb = state->fb; 263 bool interlaced = false; 264 u32 val; 265 int ret; 266 267 /* Clear the YUV mode */ 268 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 269 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0); 270 271 if (plane->state->crtc) 272 interlaced = plane->state->crtc->state->adjusted_mode.flags 273 & DRM_MODE_FLAG_INTERLACE; 274 275 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 276 SUN4I_BACKEND_MODCTL_ITLMOD_EN, 277 interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0); 278 279 DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n", 280 interlaced ? "on" : "off"); 281 282 val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >> 8); 283 if (state->alpha != DRM_BLEND_ALPHA_OPAQUE) 284 val |= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN; 285 regmap_update_bits(backend->engine.regs, 286 SUN4I_BACKEND_ATTCTL_REG0(layer), 287 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK | 288 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN, 289 val); 290 291 if (fb->format->is_yuv) 292 return sun4i_backend_update_yuv_format(backend, layer, plane); 293 294 ret = sun4i_backend_drm_format_to_layer(fb->format->format, &val); 295 if (ret) { 296 DRM_DEBUG_DRIVER("Invalid format\n"); 297 return ret; 298 } 299 300 regmap_update_bits(backend->engine.regs, 301 SUN4I_BACKEND_ATTCTL_REG1(layer), 302 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); 303 304 return 0; 305 } 306 307 int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend, 308 int layer, uint32_t fmt) 309 { 310 u32 val; 311 int ret; 312 313 ret = sun4i_backend_drm_format_to_layer(fmt, &val); 314 if (ret) { 315 DRM_DEBUG_DRIVER("Invalid format\n"); 316 return ret; 317 } 318 319 regmap_update_bits(backend->engine.regs, 320 SUN4I_BACKEND_ATTCTL_REG0(layer), 321 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN, 322 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN); 323 324 regmap_update_bits(backend->engine.regs, 325 SUN4I_BACKEND_ATTCTL_REG1(layer), 326 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val); 327 328 return 0; 329 } 330 331 static int sun4i_backend_update_yuv_buffer(struct sun4i_backend *backend, 332 struct drm_framebuffer *fb, 333 dma_addr_t paddr) 334 { 335 /* TODO: Add support for the multi-planar YUV formats */ 336 DRM_DEBUG_DRIVER("Setting packed YUV buffer address to %pad\n", &paddr); 337 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVADD_REG(0), paddr); 338 339 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); 340 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVLINEWIDTH_REG(0), 341 fb->pitches[0] * 8); 342 343 return 0; 344 } 345 346 int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend, 347 int layer, struct drm_plane *plane) 348 { 349 struct drm_plane_state *state = plane->state; 350 struct drm_framebuffer *fb = state->fb; 351 u32 lo_paddr, hi_paddr; 352 dma_addr_t paddr; 353 354 /* Set the line width */ 355 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); 356 regmap_write(backend->engine.regs, 357 SUN4I_BACKEND_LAYLINEWIDTH_REG(layer), 358 fb->pitches[0] * 8); 359 360 /* Get the start of the displayed memory */ 361 paddr = drm_fb_cma_get_gem_addr(fb, state, 0); 362 DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr); 363 364 /* 365 * backend DMA accesses DRAM directly, bypassing the system 366 * bus. As such, the address range is different and the buffer 367 * address needs to be corrected. 368 */ 369 paddr -= PHYS_OFFSET; 370 371 if (fb->format->is_yuv) 372 return sun4i_backend_update_yuv_buffer(backend, fb, paddr); 373 374 /* Write the 32 lower bits of the address (in bits) */ 375 lo_paddr = paddr << 3; 376 DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr); 377 regmap_write(backend->engine.regs, 378 SUN4I_BACKEND_LAYFB_L32ADD_REG(layer), 379 lo_paddr); 380 381 /* And the upper bits */ 382 hi_paddr = paddr >> 29; 383 DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr); 384 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG, 385 SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer), 386 SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr)); 387 388 return 0; 389 } 390 391 int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer, 392 struct drm_plane *plane) 393 { 394 struct drm_plane_state *state = plane->state; 395 struct sun4i_layer_state *p_state = state_to_sun4i_layer_state(state); 396 unsigned int priority = state->normalized_zpos; 397 unsigned int pipe = p_state->pipe; 398 399 DRM_DEBUG_DRIVER("Setting layer %d's priority to %d and pipe %d\n", 400 layer, priority, pipe); 401 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer), 402 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK | 403 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK, 404 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(p_state->pipe) | 405 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority)); 406 407 return 0; 408 } 409 410 void sun4i_backend_cleanup_layer(struct sun4i_backend *backend, 411 int layer) 412 { 413 regmap_update_bits(backend->engine.regs, 414 SUN4I_BACKEND_ATTCTL_REG0(layer), 415 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN | 416 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0); 417 } 418 419 static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state) 420 { 421 u16 src_h = state->src_h >> 16; 422 u16 src_w = state->src_w >> 16; 423 424 DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n", 425 src_w, src_h, state->crtc_w, state->crtc_h); 426 427 if ((state->crtc_h != src_h) || (state->crtc_w != src_w)) 428 return true; 429 430 return false; 431 } 432 433 static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state) 434 { 435 struct sun4i_layer *layer = plane_to_sun4i_layer(state->plane); 436 struct sun4i_backend *backend = layer->backend; 437 uint32_t format = state->fb->format->format; 438 uint64_t modifier = state->fb->modifier; 439 440 if (IS_ERR(backend->frontend)) 441 return false; 442 443 if (!sun4i_frontend_format_is_supported(format, modifier)) 444 return false; 445 446 if (!sun4i_backend_format_is_supported(format, modifier)) 447 return true; 448 449 /* 450 * TODO: The backend alone allows 2x and 4x integer scaling, including 451 * support for an alpha component (which the frontend doesn't support). 452 * Use the backend directly instead of the frontend in this case, with 453 * another test to return false. 454 */ 455 456 if (sun4i_backend_plane_uses_scaler(state)) 457 return true; 458 459 /* 460 * Here the format is supported by both the frontend and the backend 461 * and no frontend scaling is required, so use the backend directly. 462 */ 463 return false; 464 } 465 466 static bool sun4i_backend_plane_is_supported(struct drm_plane_state *state, 467 bool *uses_frontend) 468 { 469 if (sun4i_backend_plane_uses_frontend(state)) { 470 *uses_frontend = true; 471 return true; 472 } 473 474 *uses_frontend = false; 475 476 /* Scaling is not supported without the frontend. */ 477 if (sun4i_backend_plane_uses_scaler(state)) 478 return false; 479 480 return true; 481 } 482 483 static void sun4i_backend_atomic_begin(struct sunxi_engine *engine, 484 struct drm_crtc_state *old_state) 485 { 486 u32 val; 487 488 WARN_ON(regmap_read_poll_timeout(engine->regs, 489 SUN4I_BACKEND_REGBUFFCTL_REG, 490 val, !(val & SUN4I_BACKEND_REGBUFFCTL_LOADCTL), 491 100, 50000)); 492 } 493 494 static int sun4i_backend_atomic_check(struct sunxi_engine *engine, 495 struct drm_crtc_state *crtc_state) 496 { 497 struct drm_plane_state *plane_states[SUN4I_BACKEND_NUM_LAYERS] = { 0 }; 498 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 499 struct drm_atomic_state *state = crtc_state->state; 500 struct drm_device *drm = state->dev; 501 struct drm_plane *plane; 502 unsigned int num_planes = 0; 503 unsigned int num_alpha_planes = 0; 504 unsigned int num_frontend_planes = 0; 505 unsigned int num_alpha_planes_max = 1; 506 unsigned int num_yuv_planes = 0; 507 unsigned int current_pipe = 0; 508 unsigned int i; 509 510 DRM_DEBUG_DRIVER("Starting checking our planes\n"); 511 512 if (!crtc_state->planes_changed) 513 return 0; 514 515 drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) { 516 struct drm_plane_state *plane_state = 517 drm_atomic_get_plane_state(state, plane); 518 struct sun4i_layer_state *layer_state = 519 state_to_sun4i_layer_state(plane_state); 520 struct drm_framebuffer *fb = plane_state->fb; 521 struct drm_format_name_buf format_name; 522 523 if (!sun4i_backend_plane_is_supported(plane_state, 524 &layer_state->uses_frontend)) 525 return -EINVAL; 526 527 if (layer_state->uses_frontend) { 528 DRM_DEBUG_DRIVER("Using the frontend for plane %d\n", 529 plane->index); 530 num_frontend_planes++; 531 } else { 532 if (fb->format->is_yuv) { 533 DRM_DEBUG_DRIVER("Plane FB format is YUV\n"); 534 num_yuv_planes++; 535 } 536 } 537 538 DRM_DEBUG_DRIVER("Plane FB format is %s\n", 539 drm_get_format_name(fb->format->format, 540 &format_name)); 541 if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 542 num_alpha_planes++; 543 544 DRM_DEBUG_DRIVER("Plane zpos is %d\n", 545 plane_state->normalized_zpos); 546 547 /* Sort our planes by Zpos */ 548 plane_states[plane_state->normalized_zpos] = plane_state; 549 550 num_planes++; 551 } 552 553 /* All our planes were disabled, bail out */ 554 if (!num_planes) 555 return 0; 556 557 /* 558 * The hardware is a bit unusual here. 559 * 560 * Even though it supports 4 layers, it does the composition 561 * in two separate steps. 562 * 563 * The first one is assigning a layer to one of its two 564 * pipes. If more that 1 layer is assigned to the same pipe, 565 * and if pixels overlaps, the pipe will take the pixel from 566 * the layer with the highest priority. 567 * 568 * The second step is the actual alpha blending, that takes 569 * the two pipes as input, and uses the potential alpha 570 * component to do the transparency between the two. 571 * 572 * This two-step scenario makes us unable to guarantee a 573 * robust alpha blending between the 4 layers in all 574 * situations, since this means that we need to have one layer 575 * with alpha at the lowest position of our two pipes. 576 * 577 * However, we cannot even do that on every platform, since 578 * the hardware has a bug where the lowest plane of the lowest 579 * pipe (pipe 0, priority 0), if it has any alpha, will 580 * discard the pixel data entirely and just display the pixels 581 * in the background color (black by default). 582 * 583 * This means that on the affected platforms, we effectively 584 * have only three valid configurations with alpha, all of 585 * them with the alpha being on pipe1 with the lowest 586 * position, which can be 1, 2 or 3 depending on the number of 587 * planes and their zpos. 588 */ 589 590 /* For platforms that are not affected by the issue described above. */ 591 if (backend->quirks->supports_lowest_plane_alpha) 592 num_alpha_planes_max++; 593 594 if (num_alpha_planes > num_alpha_planes_max) { 595 DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n"); 596 return -EINVAL; 597 } 598 599 /* We can't have an alpha plane at the lowest position */ 600 if (!backend->quirks->supports_lowest_plane_alpha && 601 (plane_states[0]->fb->format->has_alpha || 602 (plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE))) 603 return -EINVAL; 604 605 for (i = 1; i < num_planes; i++) { 606 struct drm_plane_state *p_state = plane_states[i]; 607 struct drm_framebuffer *fb = p_state->fb; 608 struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(p_state); 609 610 /* 611 * The only alpha position is the lowest plane of the 612 * second pipe. 613 */ 614 if (fb->format->has_alpha || (p_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 615 current_pipe++; 616 617 s_state->pipe = current_pipe; 618 } 619 620 /* We can only have a single YUV plane at a time */ 621 if (num_yuv_planes > SUN4I_BACKEND_NUM_YUV_PLANES) { 622 DRM_DEBUG_DRIVER("Too many planes with YUV, rejecting...\n"); 623 return -EINVAL; 624 } 625 626 if (num_frontend_planes > SUN4I_BACKEND_NUM_FRONTEND_LAYERS) { 627 DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n"); 628 return -EINVAL; 629 } 630 631 DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n", 632 num_planes, num_alpha_planes, num_frontend_planes, 633 num_yuv_planes); 634 635 return 0; 636 } 637 638 static void sun4i_backend_vblank_quirk(struct sunxi_engine *engine) 639 { 640 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 641 struct sun4i_frontend *frontend = backend->frontend; 642 643 if (!frontend) 644 return; 645 646 /* 647 * In a teardown scenario with the frontend involved, we have 648 * to keep the frontend enabled until the next vblank, and 649 * only then disable it. 650 * 651 * This is due to the fact that the backend will not take into 652 * account the new configuration (with the plane that used to 653 * be fed by the frontend now disabled) until we write to the 654 * commit bit and the hardware fetches the new configuration 655 * during the next vblank. 656 * 657 * So we keep the frontend around in order to prevent any 658 * visual artifacts. 659 */ 660 spin_lock(&backend->frontend_lock); 661 if (backend->frontend_teardown) { 662 sun4i_frontend_exit(frontend); 663 backend->frontend_teardown = false; 664 } 665 spin_unlock(&backend->frontend_lock); 666 }; 667 668 static int sun4i_backend_init_sat(struct device *dev) { 669 struct sun4i_backend *backend = dev_get_drvdata(dev); 670 int ret; 671 672 backend->sat_reset = devm_reset_control_get(dev, "sat"); 673 if (IS_ERR(backend->sat_reset)) { 674 dev_err(dev, "Couldn't get the SAT reset line\n"); 675 return PTR_ERR(backend->sat_reset); 676 } 677 678 ret = reset_control_deassert(backend->sat_reset); 679 if (ret) { 680 dev_err(dev, "Couldn't deassert the SAT reset line\n"); 681 return ret; 682 } 683 684 backend->sat_clk = devm_clk_get(dev, "sat"); 685 if (IS_ERR(backend->sat_clk)) { 686 dev_err(dev, "Couldn't get our SAT clock\n"); 687 ret = PTR_ERR(backend->sat_clk); 688 goto err_assert_reset; 689 } 690 691 ret = clk_prepare_enable(backend->sat_clk); 692 if (ret) { 693 dev_err(dev, "Couldn't enable the SAT clock\n"); 694 return ret; 695 } 696 697 return 0; 698 699 err_assert_reset: 700 reset_control_assert(backend->sat_reset); 701 return ret; 702 } 703 704 static int sun4i_backend_free_sat(struct device *dev) { 705 struct sun4i_backend *backend = dev_get_drvdata(dev); 706 707 clk_disable_unprepare(backend->sat_clk); 708 reset_control_assert(backend->sat_reset); 709 710 return 0; 711 } 712 713 /* 714 * The display backend can take video output from the display frontend, or 715 * the display enhancement unit on the A80, as input for one it its layers. 716 * This relationship within the display pipeline is encoded in the device 717 * tree with of_graph, and we use it here to figure out which backend, if 718 * there are 2 or more, we are currently probing. The number would be in 719 * the "reg" property of the upstream output port endpoint. 720 */ 721 static int sun4i_backend_of_get_id(struct device_node *node) 722 { 723 struct device_node *port, *ep; 724 int ret = -EINVAL; 725 726 /* input is port 0 */ 727 port = of_graph_get_port_by_id(node, 0); 728 if (!port) 729 return -EINVAL; 730 731 /* try finding an upstream endpoint */ 732 for_each_available_child_of_node(port, ep) { 733 struct device_node *remote; 734 u32 reg; 735 736 remote = of_graph_get_remote_endpoint(ep); 737 if (!remote) 738 continue; 739 740 ret = of_property_read_u32(remote, "reg", ®); 741 if (ret) 742 continue; 743 744 ret = reg; 745 } 746 747 of_node_put(port); 748 749 return ret; 750 } 751 752 /* TODO: This needs to take multiple pipelines into account */ 753 static struct sun4i_frontend *sun4i_backend_find_frontend(struct sun4i_drv *drv, 754 struct device_node *node) 755 { 756 struct device_node *port, *ep, *remote; 757 struct sun4i_frontend *frontend; 758 759 port = of_graph_get_port_by_id(node, 0); 760 if (!port) 761 return ERR_PTR(-EINVAL); 762 763 for_each_available_child_of_node(port, ep) { 764 remote = of_graph_get_remote_port_parent(ep); 765 if (!remote) 766 continue; 767 of_node_put(remote); 768 769 /* does this node match any registered engines? */ 770 list_for_each_entry(frontend, &drv->frontend_list, list) { 771 if (remote == frontend->node) { 772 of_node_put(port); 773 of_node_put(ep); 774 return frontend; 775 } 776 } 777 } 778 of_node_put(port); 779 return ERR_PTR(-EINVAL); 780 } 781 782 static const struct sunxi_engine_ops sun4i_backend_engine_ops = { 783 .atomic_begin = sun4i_backend_atomic_begin, 784 .atomic_check = sun4i_backend_atomic_check, 785 .commit = sun4i_backend_commit, 786 .layers_init = sun4i_layers_init, 787 .apply_color_correction = sun4i_backend_apply_color_correction, 788 .disable_color_correction = sun4i_backend_disable_color_correction, 789 .vblank_quirk = sun4i_backend_vblank_quirk, 790 }; 791 792 static struct regmap_config sun4i_backend_regmap_config = { 793 .reg_bits = 32, 794 .val_bits = 32, 795 .reg_stride = 4, 796 .max_register = 0x5800, 797 }; 798 799 static int sun4i_backend_bind(struct device *dev, struct device *master, 800 void *data) 801 { 802 struct platform_device *pdev = to_platform_device(dev); 803 struct drm_device *drm = data; 804 struct sun4i_drv *drv = drm->dev_private; 805 struct sun4i_backend *backend; 806 const struct sun4i_backend_quirks *quirks; 807 struct resource *res; 808 void __iomem *regs; 809 int i, ret; 810 811 backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL); 812 if (!backend) 813 return -ENOMEM; 814 dev_set_drvdata(dev, backend); 815 spin_lock_init(&backend->frontend_lock); 816 817 backend->engine.node = dev->of_node; 818 backend->engine.ops = &sun4i_backend_engine_ops; 819 backend->engine.id = sun4i_backend_of_get_id(dev->of_node); 820 if (backend->engine.id < 0) 821 return backend->engine.id; 822 823 backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); 824 if (IS_ERR(backend->frontend)) 825 dev_warn(dev, "Couldn't find matching frontend, frontend features disabled\n"); 826 827 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 828 regs = devm_ioremap_resource(dev, res); 829 if (IS_ERR(regs)) 830 return PTR_ERR(regs); 831 832 backend->reset = devm_reset_control_get(dev, NULL); 833 if (IS_ERR(backend->reset)) { 834 dev_err(dev, "Couldn't get our reset line\n"); 835 return PTR_ERR(backend->reset); 836 } 837 838 ret = reset_control_deassert(backend->reset); 839 if (ret) { 840 dev_err(dev, "Couldn't deassert our reset line\n"); 841 return ret; 842 } 843 844 backend->bus_clk = devm_clk_get(dev, "ahb"); 845 if (IS_ERR(backend->bus_clk)) { 846 dev_err(dev, "Couldn't get the backend bus clock\n"); 847 ret = PTR_ERR(backend->bus_clk); 848 goto err_assert_reset; 849 } 850 clk_prepare_enable(backend->bus_clk); 851 852 backend->mod_clk = devm_clk_get(dev, "mod"); 853 if (IS_ERR(backend->mod_clk)) { 854 dev_err(dev, "Couldn't get the backend module clock\n"); 855 ret = PTR_ERR(backend->mod_clk); 856 goto err_disable_bus_clk; 857 } 858 clk_prepare_enable(backend->mod_clk); 859 860 backend->ram_clk = devm_clk_get(dev, "ram"); 861 if (IS_ERR(backend->ram_clk)) { 862 dev_err(dev, "Couldn't get the backend RAM clock\n"); 863 ret = PTR_ERR(backend->ram_clk); 864 goto err_disable_mod_clk; 865 } 866 clk_prepare_enable(backend->ram_clk); 867 868 if (of_device_is_compatible(dev->of_node, 869 "allwinner,sun8i-a33-display-backend")) { 870 ret = sun4i_backend_init_sat(dev); 871 if (ret) { 872 dev_err(dev, "Couldn't init SAT resources\n"); 873 goto err_disable_ram_clk; 874 } 875 } 876 877 backend->engine.regs = devm_regmap_init_mmio(dev, regs, 878 &sun4i_backend_regmap_config); 879 if (IS_ERR(backend->engine.regs)) { 880 dev_err(dev, "Couldn't create the backend regmap\n"); 881 return PTR_ERR(backend->engine.regs); 882 } 883 884 list_add_tail(&backend->engine.list, &drv->engine_list); 885 886 /* 887 * Many of the backend's layer configuration registers have 888 * undefined default values. This poses a risk as we use 889 * regmap_update_bits in some places, and don't overwrite 890 * the whole register. 891 * 892 * Clear the registers here to have something predictable. 893 */ 894 for (i = 0x800; i < 0x1000; i += 4) 895 regmap_write(backend->engine.regs, i, 0); 896 897 /* Disable registers autoloading */ 898 regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG, 899 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS); 900 901 /* Enable the backend */ 902 regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 903 SUN4I_BACKEND_MODCTL_DEBE_EN | 904 SUN4I_BACKEND_MODCTL_START_CTL); 905 906 /* Set output selection if needed */ 907 quirks = of_device_get_match_data(dev); 908 if (quirks->needs_output_muxing) { 909 /* 910 * We assume there is no dynamic muxing of backends 911 * and TCONs, so we select the backend with same ID. 912 * 913 * While dynamic selection might be interesting, since 914 * the CRTC is tied to the TCON, while the layers are 915 * tied to the backends, this means, we will need to 916 * switch between groups of layers. There might not be 917 * a way to represent this constraint in DRM. 918 */ 919 regmap_update_bits(backend->engine.regs, 920 SUN4I_BACKEND_MODCTL_REG, 921 SUN4I_BACKEND_MODCTL_OUT_SEL, 922 (backend->engine.id 923 ? SUN4I_BACKEND_MODCTL_OUT_LCD1 924 : SUN4I_BACKEND_MODCTL_OUT_LCD0)); 925 } 926 927 backend->quirks = quirks; 928 929 return 0; 930 931 err_disable_ram_clk: 932 clk_disable_unprepare(backend->ram_clk); 933 err_disable_mod_clk: 934 clk_disable_unprepare(backend->mod_clk); 935 err_disable_bus_clk: 936 clk_disable_unprepare(backend->bus_clk); 937 err_assert_reset: 938 reset_control_assert(backend->reset); 939 return ret; 940 } 941 942 static void sun4i_backend_unbind(struct device *dev, struct device *master, 943 void *data) 944 { 945 struct sun4i_backend *backend = dev_get_drvdata(dev); 946 947 list_del(&backend->engine.list); 948 949 if (of_device_is_compatible(dev->of_node, 950 "allwinner,sun8i-a33-display-backend")) 951 sun4i_backend_free_sat(dev); 952 953 clk_disable_unprepare(backend->ram_clk); 954 clk_disable_unprepare(backend->mod_clk); 955 clk_disable_unprepare(backend->bus_clk); 956 reset_control_assert(backend->reset); 957 } 958 959 static const struct component_ops sun4i_backend_ops = { 960 .bind = sun4i_backend_bind, 961 .unbind = sun4i_backend_unbind, 962 }; 963 964 static int sun4i_backend_probe(struct platform_device *pdev) 965 { 966 return component_add(&pdev->dev, &sun4i_backend_ops); 967 } 968 969 static int sun4i_backend_remove(struct platform_device *pdev) 970 { 971 component_del(&pdev->dev, &sun4i_backend_ops); 972 973 return 0; 974 } 975 976 static const struct sun4i_backend_quirks sun4i_backend_quirks = { 977 .needs_output_muxing = true, 978 }; 979 980 static const struct sun4i_backend_quirks sun5i_backend_quirks = { 981 }; 982 983 static const struct sun4i_backend_quirks sun6i_backend_quirks = { 984 }; 985 986 static const struct sun4i_backend_quirks sun7i_backend_quirks = { 987 .needs_output_muxing = true, 988 .supports_lowest_plane_alpha = true, 989 }; 990 991 static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = { 992 .supports_lowest_plane_alpha = true, 993 }; 994 995 static const struct sun4i_backend_quirks sun9i_backend_quirks = { 996 }; 997 998 static const struct of_device_id sun4i_backend_of_table[] = { 999 { 1000 .compatible = "allwinner,sun4i-a10-display-backend", 1001 .data = &sun4i_backend_quirks, 1002 }, 1003 { 1004 .compatible = "allwinner,sun5i-a13-display-backend", 1005 .data = &sun5i_backend_quirks, 1006 }, 1007 { 1008 .compatible = "allwinner,sun6i-a31-display-backend", 1009 .data = &sun6i_backend_quirks, 1010 }, 1011 { 1012 .compatible = "allwinner,sun7i-a20-display-backend", 1013 .data = &sun7i_backend_quirks, 1014 }, 1015 { 1016 .compatible = "allwinner,sun8i-a23-display-backend", 1017 .data = &sun8i_a33_backend_quirks, 1018 }, 1019 { 1020 .compatible = "allwinner,sun8i-a33-display-backend", 1021 .data = &sun8i_a33_backend_quirks, 1022 }, 1023 { 1024 .compatible = "allwinner,sun9i-a80-display-backend", 1025 .data = &sun9i_backend_quirks, 1026 }, 1027 { } 1028 }; 1029 MODULE_DEVICE_TABLE(of, sun4i_backend_of_table); 1030 1031 static struct platform_driver sun4i_backend_platform_driver = { 1032 .probe = sun4i_backend_probe, 1033 .remove = sun4i_backend_remove, 1034 .driver = { 1035 .name = "sun4i-backend", 1036 .of_match_table = sun4i_backend_of_table, 1037 }, 1038 }; 1039 module_platform_driver(sun4i_backend_platform_driver); 1040 1041 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 1042 MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver"); 1043 MODULE_LICENSE("GPL"); 1044