xref: /openbmc/linux/drivers/gpu/drm/tegra/plane.c (revision e752eef0)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2017 NVIDIA CORPORATION.  All rights reserved.
4  */
5 
6 #include <linux/dma-mapping.h>
7 #include <linux/iommu.h>
8 #include <linux/interconnect.h>
9 
10 #include <drm/drm_atomic.h>
11 #include <drm/drm_atomic_helper.h>
12 #include <drm/drm_fourcc.h>
13 #include <drm/drm_framebuffer.h>
14 #include <drm/drm_gem_atomic_helper.h>
15 
16 #include "dc.h"
17 #include "plane.h"
18 
tegra_plane_destroy(struct drm_plane * plane)19 static void tegra_plane_destroy(struct drm_plane *plane)
20 {
21 	struct tegra_plane *p = to_tegra_plane(plane);
22 
23 	drm_plane_cleanup(plane);
24 	kfree(p);
25 }
26 
tegra_plane_reset(struct drm_plane * plane)27 static void tegra_plane_reset(struct drm_plane *plane)
28 {
29 	struct tegra_plane *p = to_tegra_plane(plane);
30 	struct tegra_plane_state *state;
31 	unsigned int i;
32 
33 	if (plane->state)
34 		__drm_atomic_helper_plane_destroy_state(plane->state);
35 
36 	kfree(plane->state);
37 	plane->state = NULL;
38 
39 	state = kzalloc(sizeof(*state), GFP_KERNEL);
40 	if (state) {
41 		plane->state = &state->base;
42 		plane->state->plane = plane;
43 		plane->state->zpos = p->index;
44 		plane->state->normalized_zpos = p->index;
45 
46 		for (i = 0; i < 3; i++)
47 			state->iova[i] = DMA_MAPPING_ERROR;
48 	}
49 }
50 
51 static struct drm_plane_state *
tegra_plane_atomic_duplicate_state(struct drm_plane * plane)52 tegra_plane_atomic_duplicate_state(struct drm_plane *plane)
53 {
54 	struct tegra_plane_state *state = to_tegra_plane_state(plane->state);
55 	struct tegra_plane_state *copy;
56 	unsigned int i;
57 
58 	copy = kmalloc(sizeof(*copy), GFP_KERNEL);
59 	if (!copy)
60 		return NULL;
61 
62 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
63 	copy->tiling = state->tiling;
64 	copy->format = state->format;
65 	copy->swap = state->swap;
66 	copy->reflect_x = state->reflect_x;
67 	copy->reflect_y = state->reflect_y;
68 	copy->opaque = state->opaque;
69 	copy->total_peak_memory_bandwidth = state->total_peak_memory_bandwidth;
70 	copy->peak_memory_bandwidth = state->peak_memory_bandwidth;
71 	copy->avg_memory_bandwidth = state->avg_memory_bandwidth;
72 
73 	for (i = 0; i < 2; i++)
74 		copy->blending[i] = state->blending[i];
75 
76 	for (i = 0; i < 3; i++) {
77 		copy->iova[i] = DMA_MAPPING_ERROR;
78 		copy->map[i] = NULL;
79 	}
80 
81 	return &copy->base;
82 }
83 
tegra_plane_atomic_destroy_state(struct drm_plane * plane,struct drm_plane_state * state)84 static void tegra_plane_atomic_destroy_state(struct drm_plane *plane,
85 					     struct drm_plane_state *state)
86 {
87 	__drm_atomic_helper_plane_destroy_state(state);
88 	kfree(state);
89 }
90 
tegra_plane_supports_sector_layout(struct drm_plane * plane)91 static bool tegra_plane_supports_sector_layout(struct drm_plane *plane)
92 {
93 	struct drm_crtc *crtc;
94 
95 	drm_for_each_crtc(crtc, plane->dev) {
96 		if (plane->possible_crtcs & drm_crtc_mask(crtc)) {
97 			struct tegra_dc *dc = to_tegra_dc(crtc);
98 
99 			if (!dc->soc->supports_sector_layout)
100 				return false;
101 		}
102 	}
103 
104 	return true;
105 }
106 
tegra_plane_format_mod_supported(struct drm_plane * plane,uint32_t format,uint64_t modifier)107 static bool tegra_plane_format_mod_supported(struct drm_plane *plane,
108 					     uint32_t format,
109 					     uint64_t modifier)
110 {
111 	const struct drm_format_info *info = drm_format_info(format);
112 
113 	if (modifier == DRM_FORMAT_MOD_LINEAR)
114 		return true;
115 
116 	/* check for the sector layout bit */
117 	if (fourcc_mod_is_vendor(modifier, NVIDIA)) {
118 		if (modifier & DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT) {
119 			if (!tegra_plane_supports_sector_layout(plane))
120 				return false;
121 		}
122 	}
123 
124 	if (info->num_planes == 1)
125 		return true;
126 
127 	return false;
128 }
129 
130 const struct drm_plane_funcs tegra_plane_funcs = {
131 	.update_plane = drm_atomic_helper_update_plane,
132 	.disable_plane = drm_atomic_helper_disable_plane,
133 	.destroy = tegra_plane_destroy,
134 	.reset = tegra_plane_reset,
135 	.atomic_duplicate_state = tegra_plane_atomic_duplicate_state,
136 	.atomic_destroy_state = tegra_plane_atomic_destroy_state,
137 	.format_mod_supported = tegra_plane_format_mod_supported,
138 };
139 
tegra_dc_pin(struct tegra_dc * dc,struct tegra_plane_state * state)140 static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
141 {
142 	unsigned int i;
143 	int err;
144 
145 	for (i = 0; i < state->base.fb->format->num_planes; i++) {
146 		struct tegra_bo *bo = tegra_fb_get_plane(state->base.fb, i);
147 		struct host1x_bo_mapping *map;
148 
149 		map = host1x_bo_pin(dc->dev, &bo->base, DMA_TO_DEVICE, &dc->client.cache);
150 		if (IS_ERR(map)) {
151 			err = PTR_ERR(map);
152 			goto unpin;
153 		}
154 
155 		if (!dc->client.group) {
156 			/*
157 			 * The display controller needs contiguous memory, so
158 			 * fail if the buffer is discontiguous and we fail to
159 			 * map its SG table to a single contiguous chunk of
160 			 * I/O virtual memory.
161 			 */
162 			if (map->chunks > 1) {
163 				err = -EINVAL;
164 				goto unpin;
165 			}
166 
167 			state->iova[i] = map->phys;
168 		} else {
169 			state->iova[i] = bo->iova;
170 		}
171 
172 		state->map[i] = map;
173 	}
174 
175 	return 0;
176 
177 unpin:
178 	dev_err(dc->dev, "failed to map plane %u: %d\n", i, err);
179 
180 	while (i--) {
181 		host1x_bo_unpin(state->map[i]);
182 		state->iova[i] = DMA_MAPPING_ERROR;
183 		state->map[i] = NULL;
184 	}
185 
186 	return err;
187 }
188 
tegra_dc_unpin(struct tegra_dc * dc,struct tegra_plane_state * state)189 static void tegra_dc_unpin(struct tegra_dc *dc, struct tegra_plane_state *state)
190 {
191 	unsigned int i;
192 
193 	for (i = 0; i < state->base.fb->format->num_planes; i++) {
194 		host1x_bo_unpin(state->map[i]);
195 		state->iova[i] = DMA_MAPPING_ERROR;
196 		state->map[i] = NULL;
197 	}
198 }
199 
tegra_plane_prepare_fb(struct drm_plane * plane,struct drm_plane_state * state)200 int tegra_plane_prepare_fb(struct drm_plane *plane,
201 			   struct drm_plane_state *state)
202 {
203 	struct tegra_dc *dc = to_tegra_dc(state->crtc);
204 	int err;
205 
206 	if (!state->fb)
207 		return 0;
208 
209 	err = drm_gem_plane_helper_prepare_fb(plane, state);
210 	if (err < 0)
211 		return err;
212 
213 	return tegra_dc_pin(dc, to_tegra_plane_state(state));
214 }
215 
tegra_plane_cleanup_fb(struct drm_plane * plane,struct drm_plane_state * state)216 void tegra_plane_cleanup_fb(struct drm_plane *plane,
217 			    struct drm_plane_state *state)
218 {
219 	struct tegra_dc *dc = to_tegra_dc(state->crtc);
220 
221 	if (dc)
222 		tegra_dc_unpin(dc, to_tegra_plane_state(state));
223 }
224 
tegra_plane_calculate_memory_bandwidth(struct drm_plane_state * state)225 static int tegra_plane_calculate_memory_bandwidth(struct drm_plane_state *state)
226 {
227 	struct tegra_plane_state *tegra_state = to_tegra_plane_state(state);
228 	unsigned int i, bpp, dst_w, dst_h, src_w, src_h, mul;
229 	const struct tegra_dc_soc_info *soc;
230 	const struct drm_format_info *fmt;
231 	struct drm_crtc_state *crtc_state;
232 	u64 avg_bandwidth, peak_bandwidth;
233 
234 	if (!state->visible)
235 		return 0;
236 
237 	crtc_state = drm_atomic_get_new_crtc_state(state->state, state->crtc);
238 	if (!crtc_state)
239 		return -EINVAL;
240 
241 	src_w = drm_rect_width(&state->src) >> 16;
242 	src_h = drm_rect_height(&state->src) >> 16;
243 	dst_w = drm_rect_width(&state->dst);
244 	dst_h = drm_rect_height(&state->dst);
245 
246 	fmt = state->fb->format;
247 	soc = to_tegra_dc(state->crtc)->soc;
248 
249 	/*
250 	 * Note that real memory bandwidth vary depending on format and
251 	 * memory layout, we are not taking that into account because small
252 	 * estimation error isn't important since bandwidth is rounded up
253 	 * anyway.
254 	 */
255 	for (i = 0, bpp = 0; i < fmt->num_planes; i++) {
256 		unsigned int bpp_plane = fmt->cpp[i] * 8;
257 
258 		/*
259 		 * Sub-sampling is relevant for chroma planes only and vertical
260 		 * readouts are not cached, hence only horizontal sub-sampling
261 		 * matters.
262 		 */
263 		if (i > 0)
264 			bpp_plane /= fmt->hsub;
265 
266 		bpp += bpp_plane;
267 	}
268 
269 	/* average bandwidth in kbytes/sec */
270 	avg_bandwidth  = min(src_w, dst_w) * min(src_h, dst_h);
271 	avg_bandwidth *= drm_mode_vrefresh(&crtc_state->adjusted_mode);
272 	avg_bandwidth  = DIV_ROUND_UP(avg_bandwidth * bpp, 8) + 999;
273 	do_div(avg_bandwidth, 1000);
274 
275 	/* mode.clock in kHz, peak bandwidth in kbytes/sec */
276 	peak_bandwidth = DIV_ROUND_UP(crtc_state->adjusted_mode.clock * bpp, 8);
277 
278 	/*
279 	 * Tegra30/114 Memory Controller can't interleave DC memory requests
280 	 * for the tiled windows because DC uses 16-bytes atom, while DDR3
281 	 * uses 32-bytes atom.  Hence there is x2 memory overfetch for tiled
282 	 * framebuffer and DDR3 on these SoCs.
283 	 */
284 	if (soc->plane_tiled_memory_bandwidth_x2 &&
285 	    tegra_state->tiling.mode == TEGRA_BO_TILING_MODE_TILED)
286 		mul = 2;
287 	else
288 		mul = 1;
289 
290 	/* ICC bandwidth in kbytes/sec */
291 	tegra_state->peak_memory_bandwidth = kBps_to_icc(peak_bandwidth) * mul;
292 	tegra_state->avg_memory_bandwidth  = kBps_to_icc(avg_bandwidth)  * mul;
293 
294 	return 0;
295 }
296 
tegra_plane_state_add(struct tegra_plane * plane,struct drm_plane_state * state)297 int tegra_plane_state_add(struct tegra_plane *plane,
298 			  struct drm_plane_state *state)
299 {
300 	struct drm_crtc_state *crtc_state;
301 	struct tegra_dc_state *tegra;
302 	int err;
303 
304 	/* Propagate errors from allocation or locking failures. */
305 	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
306 	if (IS_ERR(crtc_state))
307 		return PTR_ERR(crtc_state);
308 
309 	/* Check plane state for visibility and calculate clipping bounds */
310 	err = drm_atomic_helper_check_plane_state(state, crtc_state,
311 						  0, INT_MAX, true, true);
312 	if (err < 0)
313 		return err;
314 
315 	err = tegra_plane_calculate_memory_bandwidth(state);
316 	if (err < 0)
317 		return err;
318 
319 	tegra = to_dc_state(crtc_state);
320 
321 	tegra->planes |= WIN_A_ACT_REQ << plane->index;
322 
323 	return 0;
324 }
325 
tegra_plane_format(u32 fourcc,u32 * format,u32 * swap)326 int tegra_plane_format(u32 fourcc, u32 *format, u32 *swap)
327 {
328 	/* assume no swapping of fetched data */
329 	if (swap)
330 		*swap = BYTE_SWAP_NOSWAP;
331 
332 	switch (fourcc) {
333 	case DRM_FORMAT_ARGB4444:
334 		*format = WIN_COLOR_DEPTH_B4G4R4A4;
335 		break;
336 
337 	case DRM_FORMAT_ARGB1555:
338 		*format = WIN_COLOR_DEPTH_B5G5R5A1;
339 		break;
340 
341 	case DRM_FORMAT_RGB565:
342 		*format = WIN_COLOR_DEPTH_B5G6R5;
343 		break;
344 
345 	case DRM_FORMAT_RGBA5551:
346 		*format = WIN_COLOR_DEPTH_A1B5G5R5;
347 		break;
348 
349 	case DRM_FORMAT_ARGB8888:
350 		*format = WIN_COLOR_DEPTH_B8G8R8A8;
351 		break;
352 
353 	case DRM_FORMAT_ABGR8888:
354 		*format = WIN_COLOR_DEPTH_R8G8B8A8;
355 		break;
356 
357 	case DRM_FORMAT_ABGR4444:
358 		*format = WIN_COLOR_DEPTH_R4G4B4A4;
359 		break;
360 
361 	case DRM_FORMAT_ABGR1555:
362 		*format = WIN_COLOR_DEPTH_R5G5B5A;
363 		break;
364 
365 	case DRM_FORMAT_BGRA5551:
366 		*format = WIN_COLOR_DEPTH_AR5G5B5;
367 		break;
368 
369 	case DRM_FORMAT_XRGB1555:
370 		*format = WIN_COLOR_DEPTH_B5G5R5X1;
371 		break;
372 
373 	case DRM_FORMAT_RGBX5551:
374 		*format = WIN_COLOR_DEPTH_X1B5G5R5;
375 		break;
376 
377 	case DRM_FORMAT_XBGR1555:
378 		*format = WIN_COLOR_DEPTH_R5G5B5X1;
379 		break;
380 
381 	case DRM_FORMAT_BGRX5551:
382 		*format = WIN_COLOR_DEPTH_X1R5G5B5;
383 		break;
384 
385 	case DRM_FORMAT_BGR565:
386 		*format = WIN_COLOR_DEPTH_R5G6B5;
387 		break;
388 
389 	case DRM_FORMAT_BGRA8888:
390 		*format = WIN_COLOR_DEPTH_A8R8G8B8;
391 		break;
392 
393 	case DRM_FORMAT_RGBA8888:
394 		*format = WIN_COLOR_DEPTH_A8B8G8R8;
395 		break;
396 
397 	case DRM_FORMAT_XRGB8888:
398 		*format = WIN_COLOR_DEPTH_B8G8R8X8;
399 		break;
400 
401 	case DRM_FORMAT_XBGR8888:
402 		*format = WIN_COLOR_DEPTH_R8G8B8X8;
403 		break;
404 
405 	case DRM_FORMAT_UYVY:
406 		*format = WIN_COLOR_DEPTH_YCbCr422;
407 		break;
408 
409 	case DRM_FORMAT_YUYV:
410 		if (!swap)
411 			return -EINVAL;
412 
413 		*format = WIN_COLOR_DEPTH_YCbCr422;
414 		*swap = BYTE_SWAP_SWAP2;
415 		break;
416 
417 	case DRM_FORMAT_YVYU:
418 		if (!swap)
419 			return -EINVAL;
420 
421 		*format = WIN_COLOR_DEPTH_YCbCr422;
422 		*swap = BYTE_SWAP_SWAP4;
423 		break;
424 
425 	case DRM_FORMAT_VYUY:
426 		if (!swap)
427 			return -EINVAL;
428 
429 		*format = WIN_COLOR_DEPTH_YCbCr422;
430 		*swap = BYTE_SWAP_SWAP4HW;
431 		break;
432 
433 	case DRM_FORMAT_YUV420:
434 		*format = WIN_COLOR_DEPTH_YCbCr420P;
435 		break;
436 
437 	case DRM_FORMAT_YUV422:
438 		*format = WIN_COLOR_DEPTH_YCbCr422P;
439 		break;
440 
441 	case DRM_FORMAT_YUV444:
442 		*format = WIN_COLOR_DEPTH_YCbCr444P;
443 		break;
444 
445 	case DRM_FORMAT_NV12:
446 		*format = WIN_COLOR_DEPTH_YCbCr420SP;
447 		break;
448 
449 	case DRM_FORMAT_NV21:
450 		*format = WIN_COLOR_DEPTH_YCrCb420SP;
451 		break;
452 
453 	case DRM_FORMAT_NV16:
454 		*format = WIN_COLOR_DEPTH_YCbCr422SP;
455 		break;
456 
457 	case DRM_FORMAT_NV61:
458 		*format = WIN_COLOR_DEPTH_YCrCb422SP;
459 		break;
460 
461 	case DRM_FORMAT_NV24:
462 		*format = WIN_COLOR_DEPTH_YCbCr444SP;
463 		break;
464 
465 	case DRM_FORMAT_NV42:
466 		*format = WIN_COLOR_DEPTH_YCrCb444SP;
467 		break;
468 
469 	default:
470 		return -EINVAL;
471 	}
472 
473 	return 0;
474 }
475 
tegra_plane_format_is_indexed(unsigned int format)476 bool tegra_plane_format_is_indexed(unsigned int format)
477 {
478 	switch (format) {
479 	case WIN_COLOR_DEPTH_P1:
480 	case WIN_COLOR_DEPTH_P2:
481 	case WIN_COLOR_DEPTH_P4:
482 	case WIN_COLOR_DEPTH_P8:
483 		return true;
484 	}
485 
486 	return false;
487 }
488 
tegra_plane_format_is_yuv(unsigned int format,unsigned int * planes,unsigned int * bpc)489 bool tegra_plane_format_is_yuv(unsigned int format, unsigned int *planes, unsigned int *bpc)
490 {
491 	switch (format) {
492 	case WIN_COLOR_DEPTH_YCbCr422:
493 	case WIN_COLOR_DEPTH_YUV422:
494 		if (planes)
495 			*planes = 1;
496 
497 		if (bpc)
498 			*bpc = 8;
499 
500 		return true;
501 
502 	case WIN_COLOR_DEPTH_YCbCr420P:
503 	case WIN_COLOR_DEPTH_YUV420P:
504 	case WIN_COLOR_DEPTH_YCbCr422P:
505 	case WIN_COLOR_DEPTH_YUV422P:
506 	case WIN_COLOR_DEPTH_YCbCr422R:
507 	case WIN_COLOR_DEPTH_YUV422R:
508 	case WIN_COLOR_DEPTH_YCbCr422RA:
509 	case WIN_COLOR_DEPTH_YUV422RA:
510 	case WIN_COLOR_DEPTH_YCbCr444P:
511 		if (planes)
512 			*planes = 3;
513 
514 		if (bpc)
515 			*bpc = 8;
516 
517 		return true;
518 
519 	case WIN_COLOR_DEPTH_YCrCb420SP:
520 	case WIN_COLOR_DEPTH_YCbCr420SP:
521 	case WIN_COLOR_DEPTH_YCrCb422SP:
522 	case WIN_COLOR_DEPTH_YCbCr422SP:
523 	case WIN_COLOR_DEPTH_YCrCb444SP:
524 	case WIN_COLOR_DEPTH_YCbCr444SP:
525 		if (planes)
526 			*planes = 2;
527 
528 		if (bpc)
529 			*bpc = 8;
530 
531 		return true;
532 	}
533 
534 	if (planes)
535 		*planes = 1;
536 
537 	return false;
538 }
539 
__drm_format_has_alpha(u32 format)540 static bool __drm_format_has_alpha(u32 format)
541 {
542 	switch (format) {
543 	case DRM_FORMAT_ARGB1555:
544 	case DRM_FORMAT_RGBA5551:
545 	case DRM_FORMAT_ABGR8888:
546 	case DRM_FORMAT_ARGB8888:
547 		return true;
548 	}
549 
550 	return false;
551 }
552 
tegra_plane_format_get_alpha(unsigned int opaque,unsigned int * alpha)553 static int tegra_plane_format_get_alpha(unsigned int opaque,
554 					unsigned int *alpha)
555 {
556 	if (tegra_plane_format_is_yuv(opaque, NULL, NULL)) {
557 		*alpha = opaque;
558 		return 0;
559 	}
560 
561 	switch (opaque) {
562 	case WIN_COLOR_DEPTH_B5G5R5X1:
563 		*alpha = WIN_COLOR_DEPTH_B5G5R5A1;
564 		return 0;
565 
566 	case WIN_COLOR_DEPTH_X1B5G5R5:
567 		*alpha = WIN_COLOR_DEPTH_A1B5G5R5;
568 		return 0;
569 
570 	case WIN_COLOR_DEPTH_R8G8B8X8:
571 		*alpha = WIN_COLOR_DEPTH_R8G8B8A8;
572 		return 0;
573 
574 	case WIN_COLOR_DEPTH_B8G8R8X8:
575 		*alpha = WIN_COLOR_DEPTH_B8G8R8A8;
576 		return 0;
577 
578 	case WIN_COLOR_DEPTH_B5G6R5:
579 		*alpha = opaque;
580 		return 0;
581 	}
582 
583 	return -EINVAL;
584 }
585 
586 /*
587  * This is applicable to Tegra20 and Tegra30 only where the opaque formats can
588  * be emulated using the alpha formats and alpha blending disabled.
589  */
tegra_plane_setup_opacity(struct tegra_plane * tegra,struct tegra_plane_state * state)590 static int tegra_plane_setup_opacity(struct tegra_plane *tegra,
591 				     struct tegra_plane_state *state)
592 {
593 	unsigned int format;
594 	int err;
595 
596 	switch (state->format) {
597 	case WIN_COLOR_DEPTH_B5G5R5A1:
598 	case WIN_COLOR_DEPTH_A1B5G5R5:
599 	case WIN_COLOR_DEPTH_R8G8B8A8:
600 	case WIN_COLOR_DEPTH_B8G8R8A8:
601 		state->opaque = false;
602 		break;
603 
604 	default:
605 		err = tegra_plane_format_get_alpha(state->format, &format);
606 		if (err < 0)
607 			return err;
608 
609 		state->format = format;
610 		state->opaque = true;
611 		break;
612 	}
613 
614 	return 0;
615 }
616 
tegra_plane_check_transparency(struct tegra_plane * tegra,struct tegra_plane_state * state)617 static int tegra_plane_check_transparency(struct tegra_plane *tegra,
618 					  struct tegra_plane_state *state)
619 {
620 	struct drm_plane_state *old, *plane_state;
621 	struct drm_plane *plane;
622 
623 	old = drm_atomic_get_old_plane_state(state->base.state, &tegra->base);
624 
625 	/* check if zpos / transparency changed */
626 	if (old->normalized_zpos == state->base.normalized_zpos &&
627 	    to_tegra_plane_state(old)->opaque == state->opaque)
628 		return 0;
629 
630 	/* include all sibling planes into this commit */
631 	drm_for_each_plane(plane, tegra->base.dev) {
632 		struct tegra_plane *p = to_tegra_plane(plane);
633 
634 		/* skip this plane and planes on different CRTCs */
635 		if (p == tegra || p->dc != tegra->dc)
636 			continue;
637 
638 		plane_state = drm_atomic_get_plane_state(state->base.state,
639 							 plane);
640 		if (IS_ERR(plane_state))
641 			return PTR_ERR(plane_state);
642 	}
643 
644 	return 1;
645 }
646 
tegra_plane_get_overlap_index(struct tegra_plane * plane,struct tegra_plane * other)647 static unsigned int tegra_plane_get_overlap_index(struct tegra_plane *plane,
648 						  struct tegra_plane *other)
649 {
650 	unsigned int index = 0, i;
651 
652 	WARN_ON(plane == other);
653 
654 	for (i = 0; i < 3; i++) {
655 		if (i == plane->index)
656 			continue;
657 
658 		if (i == other->index)
659 			break;
660 
661 		index++;
662 	}
663 
664 	return index;
665 }
666 
tegra_plane_update_transparency(struct tegra_plane * tegra,struct tegra_plane_state * state)667 static void tegra_plane_update_transparency(struct tegra_plane *tegra,
668 					    struct tegra_plane_state *state)
669 {
670 	struct drm_plane_state *new;
671 	struct drm_plane *plane;
672 	unsigned int i;
673 
674 	for_each_new_plane_in_state(state->base.state, plane, new, i) {
675 		struct tegra_plane *p = to_tegra_plane(plane);
676 		unsigned index;
677 
678 		/* skip this plane and planes on different CRTCs */
679 		if (p == tegra || p->dc != tegra->dc)
680 			continue;
681 
682 		index = tegra_plane_get_overlap_index(tegra, p);
683 
684 		if (new->fb && __drm_format_has_alpha(new->fb->format->format))
685 			state->blending[index].alpha = true;
686 		else
687 			state->blending[index].alpha = false;
688 
689 		if (new->normalized_zpos > state->base.normalized_zpos)
690 			state->blending[index].top = true;
691 		else
692 			state->blending[index].top = false;
693 
694 		/*
695 		 * Missing framebuffer means that plane is disabled, in this
696 		 * case mark B / C window as top to be able to differentiate
697 		 * windows indices order in regards to zPos for the middle
698 		 * window X / Y registers programming.
699 		 */
700 		if (!new->fb)
701 			state->blending[index].top = (index == 1);
702 	}
703 }
704 
tegra_plane_setup_transparency(struct tegra_plane * tegra,struct tegra_plane_state * state)705 static int tegra_plane_setup_transparency(struct tegra_plane *tegra,
706 					  struct tegra_plane_state *state)
707 {
708 	struct tegra_plane_state *tegra_state;
709 	struct drm_plane_state *new;
710 	struct drm_plane *plane;
711 	int err;
712 
713 	/*
714 	 * If planes zpos / transparency changed, sibling planes blending
715 	 * state may require adjustment and in this case they will be included
716 	 * into this atom commit, otherwise blending state is unchanged.
717 	 */
718 	err = tegra_plane_check_transparency(tegra, state);
719 	if (err <= 0)
720 		return err;
721 
722 	/*
723 	 * All planes are now in the atomic state, walk them up and update
724 	 * transparency state for each plane.
725 	 */
726 	drm_for_each_plane(plane, tegra->base.dev) {
727 		struct tegra_plane *p = to_tegra_plane(plane);
728 
729 		/* skip planes on different CRTCs */
730 		if (p->dc != tegra->dc)
731 			continue;
732 
733 		new = drm_atomic_get_new_plane_state(state->base.state, plane);
734 		tegra_state = to_tegra_plane_state(new);
735 
736 		/*
737 		 * There is no need to update blending state for the disabled
738 		 * plane.
739 		 */
740 		if (new->fb)
741 			tegra_plane_update_transparency(p, tegra_state);
742 	}
743 
744 	return 0;
745 }
746 
tegra_plane_setup_legacy_state(struct tegra_plane * tegra,struct tegra_plane_state * state)747 int tegra_plane_setup_legacy_state(struct tegra_plane *tegra,
748 				   struct tegra_plane_state *state)
749 {
750 	int err;
751 
752 	err = tegra_plane_setup_opacity(tegra, state);
753 	if (err < 0)
754 		return err;
755 
756 	err = tegra_plane_setup_transparency(tegra, state);
757 	if (err < 0)
758 		return err;
759 
760 	return 0;
761 }
762 
763 static const char * const tegra_plane_icc_names[TEGRA_DC_LEGACY_PLANES_NUM] = {
764 	"wina", "winb", "winc", NULL, NULL, NULL, "cursor",
765 };
766 
tegra_plane_interconnect_init(struct tegra_plane * plane)767 int tegra_plane_interconnect_init(struct tegra_plane *plane)
768 {
769 	const char *icc_name = tegra_plane_icc_names[plane->index];
770 	struct device *dev = plane->dc->dev;
771 	struct tegra_dc *dc = plane->dc;
772 	int err;
773 
774 	if (WARN_ON(plane->index >= TEGRA_DC_LEGACY_PLANES_NUM) ||
775 	    WARN_ON(!tegra_plane_icc_names[plane->index]))
776 		return -EINVAL;
777 
778 	plane->icc_mem = devm_of_icc_get(dev, icc_name);
779 	err = PTR_ERR_OR_ZERO(plane->icc_mem);
780 	if (err)
781 		return dev_err_probe(dev, err, "failed to get %s interconnect\n",
782 				     icc_name);
783 
784 	/* plane B on T20/30 has a dedicated memory client for a 6-tap vertical filter */
785 	if (plane->index == 1 && dc->soc->has_win_b_vfilter_mem_client) {
786 		plane->icc_mem_vfilter = devm_of_icc_get(dev, "winb-vfilter");
787 		err = PTR_ERR_OR_ZERO(plane->icc_mem_vfilter);
788 		if (err)
789 			return dev_err_probe(dev, err, "failed to get %s interconnect\n",
790 					     "winb-vfilter");
791 	}
792 
793 	return 0;
794 }
795