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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_crtc.h>
21#include <drm/drm_fb_cma_helper.h>
22#include <drm/drm_fourcc.h>
23#include <drm/drm_gem_cma_helper.h>
24#include <drm/drm_plane_helper.h>
25#include <drm/drm_probe_helper.h>
26
27#include "sun4i_backend.h"
28#include "sun4i_drv.h"
29#include "sun4i_frontend.h"
30#include "sun4i_layer.h"
31#include "sunxi_engine.h"
32
33struct sun4i_backend_quirks {
34 /* backend <-> TCON muxing selection done in backend */
35 bool needs_output_muxing;
36
37 /* alpha at the lowest z position is not always supported */
38 bool supports_lowest_plane_alpha;
39};
40
41static const u32 sunxi_rgb2yuv_coef[12] = {
42 0x00000107, 0x00000204, 0x00000064, 0x00000108,
43 0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808,
44 0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
45};
46
47static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine)
48{
49 int i;
50
51 DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");
52
53 /* Set color correction */
54 regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG,
55 SUN4I_BACKEND_OCCTL_ENABLE);
56
57 for (i = 0; i < 12; i++)
58 regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
59 sunxi_rgb2yuv_coef[i]);
60}
61
62static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine)
63{
64 DRM_DEBUG_DRIVER("Disabling color correction\n");
65
66 /* Disable color correction */
67 regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG,
68 SUN4I_BACKEND_OCCTL_ENABLE, 0);
69}
70
71static void sun4i_backend_commit(struct sunxi_engine *engine)
72{
73 DRM_DEBUG_DRIVER("Committing changes\n");
74
75 regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
76 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
77 SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
78}
79
80void sun4i_backend_layer_enable(struct sun4i_backend *backend,
81 int layer, bool enable)
82{
83 u32 val;
84
85 DRM_DEBUG_DRIVER("%sabling layer %d\n", enable ? "En" : "Dis",
86 layer);
87
88 if (enable)
89 val = SUN4I_BACKEND_MODCTL_LAY_EN(layer);
90 else
91 val = 0;
92
93 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
94 SUN4I_BACKEND_MODCTL_LAY_EN(layer), val);
95}
96
97static int sun4i_backend_drm_format_to_layer(u32 format, u32 *mode)
98{
99 switch (format) {
100 case DRM_FORMAT_ARGB8888:
101 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888;
102 break;
103
104 case DRM_FORMAT_ARGB4444:
105 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444;
106 break;
107
108 case DRM_FORMAT_ARGB1555:
109 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555;
110 break;
111
112 case DRM_FORMAT_RGBA5551:
113 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551;
114 break;
115
116 case DRM_FORMAT_RGBA4444:
117 *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444;
118 break;
119
120 case DRM_FORMAT_XRGB8888:
121 *mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888;
122 break;
123
124 case DRM_FORMAT_RGB888:
125 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB888;
126 break;
127
128 case DRM_FORMAT_RGB565:
129 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB565;
130 break;
131
132 default:
133 return -EINVAL;
134 }
135
136 return 0;
137}
138
139static const uint32_t sun4i_backend_formats[] = {
140 DRM_FORMAT_ARGB1555,
141 DRM_FORMAT_ARGB4444,
142 DRM_FORMAT_ARGB8888,
143 DRM_FORMAT_RGB565,
144 DRM_FORMAT_RGB888,
145 DRM_FORMAT_RGBA4444,
146 DRM_FORMAT_RGBA5551,
147 DRM_FORMAT_UYVY,
148 DRM_FORMAT_VYUY,
149 DRM_FORMAT_XRGB8888,
150 DRM_FORMAT_YUYV,
151 DRM_FORMAT_YVYU,
152};
153
154bool sun4i_backend_format_is_supported(uint32_t fmt, uint64_t modifier)
155{
156 unsigned int i;
157
158 if (modifier != DRM_FORMAT_MOD_LINEAR)
159 return false;
160
161 for (i = 0; i < ARRAY_SIZE(sun4i_backend_formats); i++)
162 if (sun4i_backend_formats[i] == fmt)
163 return true;
164
165 return false;
166}
167
168int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
169 int layer, struct drm_plane *plane)
170{
171 struct drm_plane_state *state = plane->state;
172
173 DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
174
175 if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
176 DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
177 state->crtc_w, state->crtc_h);
178 regmap_write(backend->engine.regs, SUN4I_BACKEND_DISSIZE_REG,
179 SUN4I_BACKEND_DISSIZE(state->crtc_w,
180 state->crtc_h));
181 }
182
183 /* Set height and width */
184 DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
185 state->crtc_w, state->crtc_h);
186 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
187 SUN4I_BACKEND_LAYSIZE(state->crtc_w,
188 state->crtc_h));
189
190 /* Set base coordinates */
191 DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
192 state->crtc_x, state->crtc_y);
193 regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
194 SUN4I_BACKEND_LAYCOOR(state->crtc_x,
195 state->crtc_y));
196
197 return 0;
198}
199
200static int sun4i_backend_update_yuv_format(struct sun4i_backend *backend,
201 int layer, struct drm_plane *plane)
202{
203 struct drm_plane_state *state = plane->state;
204 struct drm_framebuffer *fb = state->fb;
205 const struct drm_format_info *format = fb->format;
206 const uint32_t fmt = format->format;
207 u32 val = SUN4I_BACKEND_IYUVCTL_EN;
208 int i;
209
210 for (i = 0; i < ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef); i++)
211 regmap_write(backend->engine.regs,
212 SUN4I_BACKEND_YGCOEF_REG(i),
213 sunxi_bt601_yuv2rgb_coef[i]);
214
215 /*
216 * We should do that only for a single plane, but the
217 * framebuffer's atomic_check has our back on this.
218 */
219 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
220 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN,
221 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN);
222
223 /* TODO: Add support for the multi-planar YUV formats */
224 if (drm_format_info_is_yuv_packed(format) &&
225 drm_format_info_is_yuv_sampling_422(format))
226 val |= SUN4I_BACKEND_IYUVCTL_FBFMT_PACKED_YUV422;
227 else
228 DRM_DEBUG_DRIVER("Unsupported YUV format (0x%x)\n", fmt);
229
230 /*
231 * Allwinner seems to list the pixel sequence from right to left, while
232 * DRM lists it from left to right.
233 */
234 switch (fmt) {
235 case DRM_FORMAT_YUYV:
236 val |= SUN4I_BACKEND_IYUVCTL_FBPS_VYUY;
237 break;
238 case DRM_FORMAT_YVYU:
239 val |= SUN4I_BACKEND_IYUVCTL_FBPS_UYVY;
240 break;
241 case DRM_FORMAT_UYVY:
242 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YVYU;
243 break;
244 case DRM_FORMAT_VYUY:
245 val |= SUN4I_BACKEND_IYUVCTL_FBPS_YUYV;
246 break;
247 default:
248 DRM_DEBUG_DRIVER("Unsupported YUV pixel sequence (0x%x)\n",
249 fmt);
250 }
251
252 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVCTL_REG, val);
253
254 return 0;
255}
256
257int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
258 int layer, struct drm_plane *plane)
259{
260 struct drm_plane_state *state = plane->state;
261 struct drm_framebuffer *fb = state->fb;
262 bool interlaced = false;
263 u32 val;
264 int ret;
265
266 /* Clear the YUV mode */
267 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
268 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0);
269
270 if (plane->state->crtc)
271 interlaced = plane->state->crtc->state->adjusted_mode.flags
272 & DRM_MODE_FLAG_INTERLACE;
273
274 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
275 SUN4I_BACKEND_MODCTL_ITLMOD_EN,
276 interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0);
277
278 DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n",
279 interlaced ? "on" : "off");
280
281 val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >> 8);
282 if (state->alpha != DRM_BLEND_ALPHA_OPAQUE)
283 val |= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN;
284 regmap_update_bits(backend->engine.regs,
285 SUN4I_BACKEND_ATTCTL_REG0(layer),
286 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK |
287 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN,
288 val);
289
290 if (fb->format->is_yuv)
291 return sun4i_backend_update_yuv_format(backend, layer, plane);
292
293 ret = sun4i_backend_drm_format_to_layer(fb->format->format, &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_REG1(layer),
301 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);
302
303 return 0;
304}
305
306int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend,
307 int layer, uint32_t fmt)
308{
309 u32 val;
310 int ret;
311
312 ret = sun4i_backend_drm_format_to_layer(fmt, &val);
313 if (ret) {
314 DRM_DEBUG_DRIVER("Invalid format\n");
315 return ret;
316 }
317
318 regmap_update_bits(backend->engine.regs,
319 SUN4I_BACKEND_ATTCTL_REG0(layer),
320 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN,
321 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN);
322
323 regmap_update_bits(backend->engine.regs,
324 SUN4I_BACKEND_ATTCTL_REG1(layer),
325 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);
326
327 return 0;
328}
329
330static int sun4i_backend_update_yuv_buffer(struct sun4i_backend *backend,
331 struct drm_framebuffer *fb,
332 dma_addr_t paddr)
333{
334 /* TODO: Add support for the multi-planar YUV formats */
335 DRM_DEBUG_DRIVER("Setting packed YUV buffer address to %pad\n", &paddr);
336 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVADD_REG(0), paddr);
337
338 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
339 regmap_write(backend->engine.regs, SUN4I_BACKEND_IYUVLINEWIDTH_REG(0),
340 fb->pitches[0] * 8);
341
342 return 0;
343}
344
345int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
346 int layer, struct drm_plane *plane)
347{
348 struct drm_plane_state *state = plane->state;
349 struct drm_framebuffer *fb = state->fb;
350 u32 lo_paddr, hi_paddr;
351 dma_addr_t paddr;
352
353 /* Set the line width */
354 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
355 regmap_write(backend->engine.regs,
356 SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
357 fb->pitches[0] * 8);
358
359 /* Get the start of the displayed memory */
360 paddr = drm_fb_cma_get_gem_addr(fb, state, 0);
361 DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
362
363 if (fb->format->is_yuv)
364 return sun4i_backend_update_yuv_buffer(backend, fb, paddr);
365
366 /* Write the 32 lower bits of the address (in bits) */
367 lo_paddr = paddr << 3;
368 DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr);
369 regmap_write(backend->engine.regs,
370 SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
371 lo_paddr);
372
373 /* And the upper bits */
374 hi_paddr = paddr >> 29;
375 DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr);
376 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG,
377 SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer),
378 SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr));
379
380 return 0;
381}
382
383int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend, int layer,
384 struct drm_plane *plane)
385{
386 struct drm_plane_state *state = plane->state;
387 struct sun4i_layer_state *p_state = state_to_sun4i_layer_state(state);
388 unsigned int priority = state->normalized_zpos;
389 unsigned int pipe = p_state->pipe;
390
391 DRM_DEBUG_DRIVER("Setting layer %d's priority to %d and pipe %d\n",
392 layer, priority, pipe);
393 regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_ATTCTL_REG0(layer),
394 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK |
395 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK,
396 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(p_state->pipe) |
397 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority));
398
399 return 0;
400}
401
402void sun4i_backend_cleanup_layer(struct sun4i_backend *backend,
403 int layer)
404{
405 regmap_update_bits(backend->engine.regs,
406 SUN4I_BACKEND_ATTCTL_REG0(layer),
407 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN |
408 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN, 0);
409}
410
411static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state *state)
412{
413 u16 src_h = state->src_h >> 16;
414 u16 src_w = state->src_w >> 16;
415
416 DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n",
417 src_w, src_h, state->crtc_w, state->crtc_h);
418
419 if ((state->crtc_h != src_h) || (state->crtc_w != src_w))
420 return true;
421
422 return false;
423}
424
425static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state)
426{
427 struct sun4i_layer *layer = plane_to_sun4i_layer(state->plane);
428 struct sun4i_backend *backend = layer->backend;
429 uint32_t format = state->fb->format->format;
430 uint64_t modifier = state->fb->modifier;
431
432 if (IS_ERR(backend->frontend))
433 return false;
434
435 if (!sun4i_frontend_format_is_supported(format, modifier))
436 return false;
437
438 if (!sun4i_backend_format_is_supported(format, modifier))
439 return true;
440
441 /*
442 * TODO: The backend alone allows 2x and 4x integer scaling, including
443 * support for an alpha component (which the frontend doesn't support).
444 * Use the backend directly instead of the frontend in this case, with
445 * another test to return false.
446 */
447
448 if (sun4i_backend_plane_uses_scaler(state))
449 return true;
450
451 /*
452 * Here the format is supported by both the frontend and the backend
453 * and no frontend scaling is required, so use the backend directly.
454 */
455 return false;
456}
457
458static bool sun4i_backend_plane_is_supported(struct drm_plane_state *state,
459 bool *uses_frontend)
460{
461 if (sun4i_backend_plane_uses_frontend(state)) {
462 *uses_frontend = true;
463 return true;
464 }
465
466 *uses_frontend = false;
467
468 /* Scaling is not supported without the frontend. */
469 if (sun4i_backend_plane_uses_scaler(state))
470 return false;
471
472 return true;
473}
474
475static void sun4i_backend_atomic_begin(struct sunxi_engine *engine,
476 struct drm_crtc_state *old_state)
477{
478 u32 val;
479
480 WARN_ON(regmap_read_poll_timeout(engine->regs,
481 SUN4I_BACKEND_REGBUFFCTL_REG,
482 val, !(val & SUN4I_BACKEND_REGBUFFCTL_LOADCTL),
483 100, 50000));
484}
485
486static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
487 struct drm_crtc_state *crtc_state)
488{
489 struct drm_plane_state *plane_states[SUN4I_BACKEND_NUM_LAYERS] = { 0 };
490 struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
491 struct drm_atomic_state *state = crtc_state->state;
492 struct drm_device *drm = state->dev;
493 struct drm_plane *plane;
494 unsigned int num_planes = 0;
495 unsigned int num_alpha_planes = 0;
496 unsigned int num_frontend_planes = 0;
497 unsigned int num_alpha_planes_max = 1;
498 unsigned int num_yuv_planes = 0;
499 unsigned int current_pipe = 0;
500 unsigned int i;
501
502 DRM_DEBUG_DRIVER("Starting checking our planes\n");
503
504 if (!crtc_state->planes_changed)
505 return 0;
506
507 drm_for_each_plane_mask(plane, drm, crtc_state->plane_mask) {
508 struct drm_plane_state *plane_state =
509 drm_atomic_get_plane_state(state, plane);
510 struct sun4i_layer_state *layer_state =
511 state_to_sun4i_layer_state(plane_state);
512 struct drm_framebuffer *fb = plane_state->fb;
513
514 if (!sun4i_backend_plane_is_supported(plane_state,
515 &layer_state->uses_frontend))
516 return -EINVAL;
517
518 if (layer_state->uses_frontend) {
519 DRM_DEBUG_DRIVER("Using the frontend for plane %d\n",
520 plane->index);
521 num_frontend_planes++;
522 } else {
523 if (fb->format->is_yuv) {
524 DRM_DEBUG_DRIVER("Plane FB format is YUV\n");
525 num_yuv_planes++;
526 }
527 }
528
529 DRM_DEBUG_DRIVER("Plane FB format is %p4cc\n",
530 &fb->format->format);
531 if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
532 num_alpha_planes++;
533
534 DRM_DEBUG_DRIVER("Plane zpos is %d\n",
535 plane_state->normalized_zpos);
536
537 /* Sort our planes by Zpos */
538 plane_states[plane_state->normalized_zpos] = plane_state;
539
540 num_planes++;
541 }
542
543 /* All our planes were disabled, bail out */
544 if (!num_planes)
545 return 0;
546
547 /*
548 * The hardware is a bit unusual here.
549 *
550 * Even though it supports 4 layers, it does the composition
551 * in two separate steps.
552 *
553 * The first one is assigning a layer to one of its two
554 * pipes. If more that 1 layer is assigned to the same pipe,
555 * and if pixels overlaps, the pipe will take the pixel from
556 * the layer with the highest priority.
557 *
558 * The second step is the actual alpha blending, that takes
559 * the two pipes as input, and uses the potential alpha
560 * component to do the transparency between the two.
561 *
562 * This two-step scenario makes us unable to guarantee a
563 * robust alpha blending between the 4 layers in all
564 * situations, since this means that we need to have one layer
565 * with alpha at the lowest position of our two pipes.
566 *
567 * However, we cannot even do that on every platform, since
568 * the hardware has a bug where the lowest plane of the lowest
569 * pipe (pipe 0, priority 0), if it has any alpha, will
570 * discard the pixel data entirely and just display the pixels
571 * in the background color (black by default).
572 *
573 * This means that on the affected platforms, we effectively
574 * have only three valid configurations with alpha, all of
575 * them with the alpha being on pipe1 with the lowest
576 * position, which can be 1, 2 or 3 depending on the number of
577 * planes and their zpos.
578 */
579
580 /* For platforms that are not affected by the issue described above. */
581 if (backend->quirks->supports_lowest_plane_alpha)
582 num_alpha_planes_max++;
583
584 if (num_alpha_planes > num_alpha_planes_max) {
585 DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n");
586 return -EINVAL;
587 }
588
589 /* We can't have an alpha plane at the lowest position */
590 if (!backend->quirks->supports_lowest_plane_alpha &&
591 (plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE))
592 return -EINVAL;
593
594 for (i = 1; i < num_planes; i++) {
595 struct drm_plane_state *p_state = plane_states[i];
596 struct drm_framebuffer *fb = p_state->fb;
597 struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(p_state);
598
599 /*
600 * The only alpha position is the lowest plane of the
601 * second pipe.
602 */
603 if (fb->format->has_alpha || (p_state->alpha != DRM_BLEND_ALPHA_OPAQUE))
604 current_pipe++;
605
606 s_state->pipe = current_pipe;
607 }
608
609 /* We can only have a single YUV plane at a time */
610 if (num_yuv_planes > SUN4I_BACKEND_NUM_YUV_PLANES) {
611 DRM_DEBUG_DRIVER("Too many planes with YUV, rejecting...\n");
612 return -EINVAL;
613 }
614
615 if (num_frontend_planes > SUN4I_BACKEND_NUM_FRONTEND_LAYERS) {
616 DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n");
617 return -EINVAL;
618 }
619
620 DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n",
621 num_planes, num_alpha_planes, num_frontend_planes,
622 num_yuv_planes);
623
624 return 0;
625}
626
627static void sun4i_backend_vblank_quirk(struct sunxi_engine *engine)
628{
629 struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
630 struct sun4i_frontend *frontend = backend->frontend;
631
632 if (!frontend)
633 return;
634
635 /*
636 * In a teardown scenario with the frontend involved, we have
637 * to keep the frontend enabled until the next vblank, and
638 * only then disable it.
639 *
640 * This is due to the fact that the backend will not take into
641 * account the new configuration (with the plane that used to
642 * be fed by the frontend now disabled) until we write to the
643 * commit bit and the hardware fetches the new configuration
644 * during the next vblank.
645 *
646 * So we keep the frontend around in order to prevent any
647 * visual artifacts.
648 */
649 spin_lock(&backend->frontend_lock);
650 if (backend->frontend_teardown) {
651 sun4i_frontend_exit(frontend);
652 backend->frontend_teardown = false;
653 }
654 spin_unlock(&backend->frontend_lock);
655};
656
657static 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
688err_assert_reset:
689 reset_control_assert(backend->sat_reset);
690 return ret;
691}
692
693static 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 */
710static 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 */
731static 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
760static 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};
769
770static const struct regmap_config sun4i_backend_regmap_config = {
771 .reg_bits = 32,
772 .val_bits = 32,
773 .reg_stride = 4,
774 .max_register = 0x5800,
775};
776
777static int sun4i_backend_bind(struct device *dev, struct device *master,
778 void *data)
779{
780 struct platform_device *pdev = to_platform_device(dev);
781 struct drm_device *drm = data;
782 struct sun4i_drv *drv = drm->dev_private;
783 struct sun4i_backend *backend;
784 const struct sun4i_backend_quirks *quirks;
785 struct resource *res;
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 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
819 regs = devm_ioremap_resource(dev, res);
820 if (IS_ERR(regs))
821 return PTR_ERR(regs);
822
823 backend->reset = devm_reset_control_get(dev, NULL);
824 if (IS_ERR(backend->reset)) {
825 dev_err(dev, "Couldn't get our reset line\n");
826 return PTR_ERR(backend->reset);
827 }
828
829 ret = reset_control_deassert(backend->reset);
830 if (ret) {
831 dev_err(dev, "Couldn't deassert our reset line\n");
832 return ret;
833 }
834
835 backend->bus_clk = devm_clk_get(dev, "ahb");
836 if (IS_ERR(backend->bus_clk)) {
837 dev_err(dev, "Couldn't get the backend bus clock\n");
838 ret = PTR_ERR(backend->bus_clk);
839 goto err_assert_reset;
840 }
841 clk_prepare_enable(backend->bus_clk);
842
843 backend->mod_clk = devm_clk_get(dev, "mod");
844 if (IS_ERR(backend->mod_clk)) {
845 dev_err(dev, "Couldn't get the backend module clock\n");
846 ret = PTR_ERR(backend->mod_clk);
847 goto err_disable_bus_clk;
848 }
849
850 ret = clk_set_rate_exclusive(backend->mod_clk, 300000000);
851 if (ret) {
852 dev_err(dev, "Couldn't set the module clock frequency\n");
853 goto err_disable_bus_clk;
854 }
855
856 clk_prepare_enable(backend->mod_clk);
857
858 backend->ram_clk = devm_clk_get(dev, "ram");
859 if (IS_ERR(backend->ram_clk)) {
860 dev_err(dev, "Couldn't get the backend RAM clock\n");
861 ret = PTR_ERR(backend->ram_clk);
862 goto err_disable_mod_clk;
863 }
864 clk_prepare_enable(backend->ram_clk);
865
866 if (of_device_is_compatible(dev->of_node,
867 "allwinner,sun8i-a33-display-backend")) {
868 ret = sun4i_backend_init_sat(dev);
869 if (ret) {
870 dev_err(dev, "Couldn't init SAT resources\n");
871 goto err_disable_ram_clk;
872 }
873 }
874
875 backend->engine.regs = devm_regmap_init_mmio(dev, regs,
876 &sun4i_backend_regmap_config);
877 if (IS_ERR(backend->engine.regs)) {
878 dev_err(dev, "Couldn't create the backend regmap\n");
879 return PTR_ERR(backend->engine.regs);
880 }
881
882 list_add_tail(&backend->engine.list, &drv->engine_list);
883
884 /*
885 * Many of the backend's layer configuration registers have
886 * undefined default values. This poses a risk as we use
887 * regmap_update_bits in some places, and don't overwrite
888 * the whole register.
889 *
890 * Clear the registers here to have something predictable.
891 */
892 for (i = 0x800; i < 0x1000; i += 4)
893 regmap_write(backend->engine.regs, i, 0);
894
895 /* Disable registers autoloading */
896 regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG,
897 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS);
898
899 /* Enable the backend */
900 regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
901 SUN4I_BACKEND_MODCTL_DEBE_EN |
902 SUN4I_BACKEND_MODCTL_START_CTL);
903
904 /* Set output selection if needed */
905 quirks = of_device_get_match_data(dev);
906 if (quirks->needs_output_muxing) {
907 /*
908 * We assume there is no dynamic muxing of backends
909 * and TCONs, so we select the backend with same ID.
910 *
911 * While dynamic selection might be interesting, since
912 * the CRTC is tied to the TCON, while the layers are
913 * tied to the backends, this means, we will need to
914 * switch between groups of layers. There might not be
915 * a way to represent this constraint in DRM.
916 */
917 regmap_update_bits(backend->engine.regs,
918 SUN4I_BACKEND_MODCTL_REG,
919 SUN4I_BACKEND_MODCTL_OUT_SEL,
920 (backend->engine.id
921 ? SUN4I_BACKEND_MODCTL_OUT_LCD1
922 : SUN4I_BACKEND_MODCTL_OUT_LCD0));
923 }
924
925 backend->quirks = quirks;
926
927 return 0;
928
929err_disable_ram_clk:
930 clk_disable_unprepare(backend->ram_clk);
931err_disable_mod_clk:
932 clk_rate_exclusive_put(backend->mod_clk);
933 clk_disable_unprepare(backend->mod_clk);
934err_disable_bus_clk:
935 clk_disable_unprepare(backend->bus_clk);
936err_assert_reset:
937 reset_control_assert(backend->reset);
938 return ret;
939}
940
941static void sun4i_backend_unbind(struct device *dev, struct device *master,
942 void *data)
943{
944 struct sun4i_backend *backend = dev_get_drvdata(dev);
945
946 list_del(&backend->engine.list);
947
948 if (of_device_is_compatible(dev->of_node,
949 "allwinner,sun8i-a33-display-backend"))
950 sun4i_backend_free_sat(dev);
951
952 clk_disable_unprepare(backend->ram_clk);
953 clk_rate_exclusive_put(backend->mod_clk);
954 clk_disable_unprepare(backend->mod_clk);
955 clk_disable_unprepare(backend->bus_clk);
956 reset_control_assert(backend->reset);
957}
958
959static const struct component_ops sun4i_backend_ops = {
960 .bind = sun4i_backend_bind,
961 .unbind = sun4i_backend_unbind,
962};
963
964static int sun4i_backend_probe(struct platform_device *pdev)
965{
966 return component_add(&pdev->dev, &sun4i_backend_ops);
967}
968
969static int sun4i_backend_remove(struct platform_device *pdev)
970{
971 component_del(&pdev->dev, &sun4i_backend_ops);
972
973 return 0;
974}
975
976static const struct sun4i_backend_quirks sun4i_backend_quirks = {
977 .needs_output_muxing = true,
978};
979
980static const struct sun4i_backend_quirks sun5i_backend_quirks = {
981};
982
983static const struct sun4i_backend_quirks sun6i_backend_quirks = {
984};
985
986static const struct sun4i_backend_quirks sun7i_backend_quirks = {
987 .needs_output_muxing = true,
988};
989
990static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = {
991 .supports_lowest_plane_alpha = true,
992};
993
994static const struct sun4i_backend_quirks sun9i_backend_quirks = {
995};
996
997static const struct of_device_id sun4i_backend_of_table[] = {
998 {
999 .compatible = "allwinner,sun4i-a10-display-backend",
1000 .data = &sun4i_backend_quirks,
1001 },
1002 {
1003 .compatible = "allwinner,sun5i-a13-display-backend",
1004 .data = &sun5i_backend_quirks,
1005 },
1006 {
1007 .compatible = "allwinner,sun6i-a31-display-backend",
1008 .data = &sun6i_backend_quirks,
1009 },
1010 {
1011 .compatible = "allwinner,sun7i-a20-display-backend",
1012 .data = &sun7i_backend_quirks,
1013 },
1014 {
1015 .compatible = "allwinner,sun8i-a23-display-backend",
1016 .data = &sun8i_a33_backend_quirks,
1017 },
1018 {
1019 .compatible = "allwinner,sun8i-a33-display-backend",
1020 .data = &sun8i_a33_backend_quirks,
1021 },
1022 {
1023 .compatible = "allwinner,sun9i-a80-display-backend",
1024 .data = &sun9i_backend_quirks,
1025 },
1026 { }
1027};
1028MODULE_DEVICE_TABLE(of, sun4i_backend_of_table);
1029
1030static struct platform_driver sun4i_backend_platform_driver = {
1031 .probe = sun4i_backend_probe,
1032 .remove = sun4i_backend_remove,
1033 .driver = {
1034 .name = "sun4i-backend",
1035 .of_match_table = sun4i_backend_of_table,
1036 },
1037};
1038module_platform_driver(sun4i_backend_platform_driver);
1039
1040MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1041MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver");
1042MODULE_LICENSE("GPL");