Hi Paul, Thank you for the patch! Yet something to improve:
[auto build test ERROR on sunxi/sunxi/for-next] [also build test ERROR on v4.18-rc5 next-20180718] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Paul-Kocialkowski/drm-sun4i-sun4i-Introduce-a-quirk-for-lowest-plane-alpha-support/20180719-030611 base: https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git sunxi/for-next config: arm-allmodconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.2.0 make.cross ARCH=arm All errors (new ones prefixed by >>): drivers/gpu/drm/sun4i/sun4i_backend.c: In function 'sun4i_backend_atomic_check': >> drivers/gpu/drm/sun4i/sun4i_backend.c:560:13: error: 'struct sun4i_backend' >> has no member named 'quirks' if (backend->quirks->supports_lowest_plane_alpha) ^~ drivers/gpu/drm/sun4i/sun4i_backend.c:569:14: error: 'struct sun4i_backend' has no member named 'quirks' if (!backend->quirks->supports_lowest_plane_alpha && ^~ vim +560 drivers/gpu/drm/sun4i/sun4i_backend.c 463 464 static int sun4i_backend_atomic_check(struct sunxi_engine *engine, 465 struct drm_crtc_state *crtc_state) 466 { 467 struct drm_plane_state *plane_states[SUN4I_BACKEND_NUM_LAYERS] = { 0 }; 468 struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 469 struct drm_atomic_state *state = crtc_state->state; 470 struct drm_device *drm = state->dev; 471 struct drm_plane *plane; 472 unsigned int num_planes = 0; 473 unsigned int num_alpha_planes = 0; 474 unsigned int num_frontend_planes = 0; 475 unsigned int num_alpha_planes_max = 1; 476 unsigned int num_yuv_planes = 0; 477 unsigned int current_pipe = 0; 478 unsigned int i; 479 480 DRM_DEBUG_DRIVER("Starting checking our planes\n"); 481 482 if (!crtc_state->planes_changed) 483 return 0; 484 485 drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) { 486 struct drm_plane_state *plane_state = 487 drm_atomic_get_plane_state(state, plane); 488 struct sun4i_layer_state *layer_state = 489 state_to_sun4i_layer_state(plane_state); 490 struct drm_framebuffer *fb = plane_state->fb; 491 struct drm_format_name_buf format_name; 492 493 if (sun4i_backend_plane_uses_frontend(plane_state)) { 494 DRM_DEBUG_DRIVER("Using the frontend for plane %d\n", 495 plane->index); 496 497 layer_state->uses_frontend = true; 498 num_frontend_planes++; 499 } else { 500 layer_state->uses_frontend = false; 501 } 502 503 DRM_DEBUG_DRIVER("Plane FB format is %s\n", 504 drm_get_format_name(fb->format->format, 505 &format_name)); 506 if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE)) 507 num_alpha_planes++; 508 509 if (sun4i_backend_format_is_yuv(fb->format->format)) { 510 DRM_DEBUG_DRIVER("Plane FB format is YUV\n"); 511 num_yuv_planes++; 512 } 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 the 548 * hardware has a bug where the lowest plane of the lowest pipe 549 * (pipe 0, priority 0), if it has any alpha, will discard the 550 * pixel data entirely and just display the pixels in the 551 * 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 them 555 * with the alpha being on pipe1 with the lowest position, which 556 * can be 1, 2 or 3 depending on the number of planes and their zpos. 557 */ 558 559 /* For platforms that are not affected by the issue described above. */ > 560 if (backend->quirks->supports_lowest_plane_alpha) 561 num_alpha_planes_max++; 562 563 if (num_alpha_planes > num_alpha_planes_max) { 564 DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n"); 565 return -EINVAL; 566 } 567 568 /* We can't have an alpha plane at the lowest position */ 569 if (!backend->quirks->supports_lowest_plane_alpha && 570 (plane_states[0]->fb->format->has_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 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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