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Message-ID: <201807190447.oi0SxKqP%fengguang.wu@intel.com>
Date: Thu, 19 Jul 2018 05:02:19 +0800
From: kbuild test robot <lkp@...el.com>
To: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc: kbuild-all@...org, dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Maxime Ripard <maxime.ripard@...tlin.com>,
David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
linux-sunxi@...glegroups.com,
Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH v2] drm/sun4i: sun4i: Introduce a quirk for lowest plane
alpha support
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
---
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