1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015 Broadcom
4 */
5
6 /**
7 * DOC: VC4 KMS
8 *
9 * This is the general code for implementing KMS mode setting that
10 * doesn't clearly associate with any of the other objects (plane,
11 * crtc, HDMI encoder).
12 */
13
14 #include <linux/clk.h>
15 #include <linux/sort.h>
16
17 #include <drm/drm_atomic.h>
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_crtc.h>
20 #include <drm/drm_fourcc.h>
21 #include <drm/drm_gem_framebuffer_helper.h>
22 #include <drm/drm_print.h>
23 #include <drm/drm_probe_helper.h>
24 #include <drm/drm_vblank.h>
25
26 #include "vc4_drv.h"
27 #include "vc4_regs.h"
28
29 struct vc4_ctm_state {
30 struct drm_private_state base;
31 struct drm_color_ctm *ctm;
32 int fifo;
33 };
34
35 #define to_vc4_ctm_state(_state) \
36 container_of_const(_state, struct vc4_ctm_state, base)
37
38 struct vc4_load_tracker_state {
39 struct drm_private_state base;
40 u64 hvs_load;
41 u64 membus_load;
42 };
43
44 #define to_vc4_load_tracker_state(_state) \
45 container_of_const(_state, struct vc4_load_tracker_state, base)
46
vc4_get_ctm_state(struct drm_atomic_state * state,struct drm_private_obj * manager)47 static struct vc4_ctm_state *vc4_get_ctm_state(struct drm_atomic_state *state,
48 struct drm_private_obj *manager)
49 {
50 struct drm_device *dev = state->dev;
51 struct vc4_dev *vc4 = to_vc4_dev(dev);
52 struct drm_private_state *priv_state;
53 int ret;
54
55 ret = drm_modeset_lock(&vc4->ctm_state_lock, state->acquire_ctx);
56 if (ret)
57 return ERR_PTR(ret);
58
59 priv_state = drm_atomic_get_private_obj_state(state, manager);
60 if (IS_ERR(priv_state))
61 return ERR_CAST(priv_state);
62
63 return to_vc4_ctm_state(priv_state);
64 }
65
66 static struct drm_private_state *
vc4_ctm_duplicate_state(struct drm_private_obj * obj)67 vc4_ctm_duplicate_state(struct drm_private_obj *obj)
68 {
69 struct vc4_ctm_state *state;
70
71 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
72 if (!state)
73 return NULL;
74
75 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
76
77 return &state->base;
78 }
79
vc4_ctm_destroy_state(struct drm_private_obj * obj,struct drm_private_state * state)80 static void vc4_ctm_destroy_state(struct drm_private_obj *obj,
81 struct drm_private_state *state)
82 {
83 struct vc4_ctm_state *ctm_state = to_vc4_ctm_state(state);
84
85 kfree(ctm_state);
86 }
87
88 static const struct drm_private_state_funcs vc4_ctm_state_funcs = {
89 .atomic_duplicate_state = vc4_ctm_duplicate_state,
90 .atomic_destroy_state = vc4_ctm_destroy_state,
91 };
92
vc4_ctm_obj_fini(struct drm_device * dev,void * unused)93 static void vc4_ctm_obj_fini(struct drm_device *dev, void *unused)
94 {
95 struct vc4_dev *vc4 = to_vc4_dev(dev);
96
97 drm_atomic_private_obj_fini(&vc4->ctm_manager);
98 }
99
vc4_ctm_obj_init(struct vc4_dev * vc4)100 static int vc4_ctm_obj_init(struct vc4_dev *vc4)
101 {
102 struct vc4_ctm_state *ctm_state;
103
104 drm_modeset_lock_init(&vc4->ctm_state_lock);
105
106 ctm_state = kzalloc_obj(*ctm_state);
107 if (!ctm_state)
108 return -ENOMEM;
109
110 drm_atomic_private_obj_init(&vc4->base, &vc4->ctm_manager, &ctm_state->base,
111 &vc4_ctm_state_funcs);
112
113 return drmm_add_action_or_reset(&vc4->base, vc4_ctm_obj_fini, NULL);
114 }
115
116 /* Converts a DRM S31.32 value to the HW S0.9 format. */
vc4_ctm_s31_32_to_s0_9(u64 in)117 static u16 vc4_ctm_s31_32_to_s0_9(u64 in)
118 {
119 u16 r;
120
121 /* Sign bit. */
122 r = in & BIT_ULL(63) ? BIT(9) : 0;
123
124 if ((in & GENMASK_ULL(62, 32)) > 0) {
125 /* We have zero integer bits so we can only saturate here. */
126 r |= GENMASK(8, 0);
127 } else {
128 /* Otherwise take the 9 most important fractional bits. */
129 r |= (in >> 23) & GENMASK(8, 0);
130 }
131
132 return r;
133 }
134
135 static void
vc4_ctm_commit(struct vc4_dev * vc4,struct drm_atomic_state * state)136 vc4_ctm_commit(struct vc4_dev *vc4, struct drm_atomic_state *state)
137 {
138 struct vc4_hvs *hvs = vc4->hvs;
139 struct vc4_ctm_state *ctm_state = to_vc4_ctm_state(vc4->ctm_manager.state);
140 struct drm_color_ctm *ctm = ctm_state->ctm;
141
142 WARN_ON_ONCE(vc4->gen > VC4_GEN_5);
143
144 if (ctm_state->fifo) {
145 HVS_WRITE(SCALER_OLEDCOEF2,
146 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[0]),
147 SCALER_OLEDCOEF2_R_TO_R) |
148 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[3]),
149 SCALER_OLEDCOEF2_R_TO_G) |
150 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[6]),
151 SCALER_OLEDCOEF2_R_TO_B));
152 HVS_WRITE(SCALER_OLEDCOEF1,
153 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[1]),
154 SCALER_OLEDCOEF1_G_TO_R) |
155 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[4]),
156 SCALER_OLEDCOEF1_G_TO_G) |
157 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[7]),
158 SCALER_OLEDCOEF1_G_TO_B));
159 HVS_WRITE(SCALER_OLEDCOEF0,
160 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[2]),
161 SCALER_OLEDCOEF0_B_TO_R) |
162 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[5]),
163 SCALER_OLEDCOEF0_B_TO_G) |
164 VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[8]),
165 SCALER_OLEDCOEF0_B_TO_B));
166 }
167
168 HVS_WRITE(SCALER_OLEDOFFS,
169 VC4_SET_FIELD(ctm_state->fifo, SCALER_OLEDOFFS_DISPFIFO));
170 }
171
172 struct vc4_hvs_state *
vc4_hvs_get_new_global_state(const struct drm_atomic_state * state)173 vc4_hvs_get_new_global_state(const struct drm_atomic_state *state)
174 {
175 struct vc4_dev *vc4 = to_vc4_dev(state->dev);
176 struct drm_private_state *priv_state;
177
178 priv_state = drm_atomic_get_new_private_obj_state(state, &vc4->hvs_channels);
179 if (!priv_state)
180 return ERR_PTR(-EINVAL);
181
182 return to_vc4_hvs_state(priv_state);
183 }
184
185 struct vc4_hvs_state *
vc4_hvs_get_old_global_state(const struct drm_atomic_state * state)186 vc4_hvs_get_old_global_state(const struct drm_atomic_state *state)
187 {
188 struct vc4_dev *vc4 = to_vc4_dev(state->dev);
189 struct drm_private_state *priv_state;
190
191 priv_state = drm_atomic_get_old_private_obj_state(state, &vc4->hvs_channels);
192 if (!priv_state)
193 return ERR_PTR(-EINVAL);
194
195 return to_vc4_hvs_state(priv_state);
196 }
197
198 struct vc4_hvs_state *
vc4_hvs_get_global_state(struct drm_atomic_state * state)199 vc4_hvs_get_global_state(struct drm_atomic_state *state)
200 {
201 struct vc4_dev *vc4 = to_vc4_dev(state->dev);
202 struct drm_private_state *priv_state;
203
204 priv_state = drm_atomic_get_private_obj_state(state, &vc4->hvs_channels);
205 if (IS_ERR(priv_state))
206 return ERR_CAST(priv_state);
207
208 return to_vc4_hvs_state(priv_state);
209 }
210
vc4_hvs_pv_muxing_commit(struct vc4_dev * vc4,struct drm_atomic_state * state)211 static void vc4_hvs_pv_muxing_commit(struct vc4_dev *vc4,
212 struct drm_atomic_state *state)
213 {
214 struct vc4_hvs *hvs = vc4->hvs;
215 struct drm_crtc_state *crtc_state;
216 struct drm_crtc *crtc;
217 unsigned int i;
218
219 WARN_ON_ONCE(vc4->gen != VC4_GEN_4);
220
221 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
222 struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
223 struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc_state);
224 u32 dispctrl;
225 u32 dsp3_mux;
226
227 if (!crtc_state->active)
228 continue;
229
230 if (vc4_state->assigned_channel != 2)
231 continue;
232
233 /*
234 * SCALER_DISPCTRL_DSP3 = X, where X < 2 means 'connect DSP3 to
235 * FIFO X'.
236 * SCALER_DISPCTRL_DSP3 = 3 means 'disable DSP 3'.
237 *
238 * DSP3 is connected to FIFO2 unless the transposer is
239 * enabled. In this case, FIFO 2 is directly accessed by the
240 * TXP IP, and we need to disable the FIFO2 -> pixelvalve1
241 * route.
242 */
243 if (vc4_crtc->feeds_txp)
244 dsp3_mux = VC4_SET_FIELD(3, SCALER_DISPCTRL_DSP3_MUX);
245 else
246 dsp3_mux = VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX);
247
248 dispctrl = HVS_READ(SCALER_DISPCTRL) &
249 ~SCALER_DISPCTRL_DSP3_MUX_MASK;
250 HVS_WRITE(SCALER_DISPCTRL, dispctrl | dsp3_mux);
251 }
252 }
253
vc5_hvs_pv_muxing_commit(struct vc4_dev * vc4,struct drm_atomic_state * state)254 static void vc5_hvs_pv_muxing_commit(struct vc4_dev *vc4,
255 struct drm_atomic_state *state)
256 {
257 struct vc4_hvs *hvs = vc4->hvs;
258 struct drm_crtc_state *crtc_state;
259 struct drm_crtc *crtc;
260 unsigned char mux;
261 unsigned int i;
262 u32 reg;
263
264 WARN_ON_ONCE(vc4->gen != VC4_GEN_5);
265
266 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
267 struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc_state);
268 struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
269 unsigned int channel = vc4_state->assigned_channel;
270
271 if (!vc4_state->update_muxing)
272 continue;
273
274 switch (vc4_crtc->data->hvs_output) {
275 case 2:
276 drm_WARN_ON(&vc4->base,
277 VC4_GET_FIELD(HVS_READ(SCALER_DISPCTRL),
278 SCALER_DISPCTRL_DSP3_MUX) == channel);
279
280 mux = (channel == 2) ? 0 : 1;
281 reg = HVS_READ(SCALER_DISPECTRL);
282 HVS_WRITE(SCALER_DISPECTRL,
283 (reg & ~SCALER_DISPECTRL_DSP2_MUX_MASK) |
284 VC4_SET_FIELD(mux, SCALER_DISPECTRL_DSP2_MUX));
285 break;
286
287 case 3:
288 if (channel == VC4_HVS_CHANNEL_DISABLED)
289 mux = 3;
290 else
291 mux = channel;
292
293 reg = HVS_READ(SCALER_DISPCTRL);
294 HVS_WRITE(SCALER_DISPCTRL,
295 (reg & ~SCALER_DISPCTRL_DSP3_MUX_MASK) |
296 VC4_SET_FIELD(mux, SCALER_DISPCTRL_DSP3_MUX));
297 break;
298
299 case 4:
300 if (channel == VC4_HVS_CHANNEL_DISABLED)
301 mux = 3;
302 else
303 mux = channel;
304
305 reg = HVS_READ(SCALER_DISPEOLN);
306 HVS_WRITE(SCALER_DISPEOLN,
307 (reg & ~SCALER_DISPEOLN_DSP4_MUX_MASK) |
308 VC4_SET_FIELD(mux, SCALER_DISPEOLN_DSP4_MUX));
309
310 break;
311
312 case 5:
313 if (channel == VC4_HVS_CHANNEL_DISABLED)
314 mux = 3;
315 else
316 mux = channel;
317
318 reg = HVS_READ(SCALER_DISPDITHER);
319 HVS_WRITE(SCALER_DISPDITHER,
320 (reg & ~SCALER_DISPDITHER_DSP5_MUX_MASK) |
321 VC4_SET_FIELD(mux, SCALER_DISPDITHER_DSP5_MUX));
322 break;
323
324 default:
325 break;
326 }
327 }
328 }
329
vc6_hvs_pv_muxing_commit(struct vc4_dev * vc4,struct drm_atomic_state * state)330 static void vc6_hvs_pv_muxing_commit(struct vc4_dev *vc4,
331 struct drm_atomic_state *state)
332 {
333 struct vc4_hvs *hvs = vc4->hvs;
334 struct drm_crtc_state *crtc_state;
335 struct drm_crtc *crtc;
336 unsigned int i;
337
338 WARN_ON_ONCE(vc4->gen != VC4_GEN_6_C && vc4->gen != VC4_GEN_6_D);
339
340 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
341 struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc_state);
342 struct vc4_encoder *vc4_encoder;
343 struct drm_encoder *encoder;
344 unsigned char mux;
345 u32 reg;
346
347 if (!vc4_state->update_muxing)
348 continue;
349
350 if (vc4_state->assigned_channel != 1)
351 continue;
352
353 encoder = vc4_get_crtc_encoder(crtc, crtc_state);
354 vc4_encoder = to_vc4_encoder(encoder);
355 switch (vc4_encoder->type) {
356 case VC4_ENCODER_TYPE_HDMI1:
357 mux = 0;
358 break;
359
360 case VC4_ENCODER_TYPE_TXP1:
361 mux = 2;
362 break;
363
364 default:
365 drm_err(&vc4->base, "Unhandled encoder type for PV muxing %d",
366 vc4_encoder->type);
367 mux = 0;
368 break;
369 }
370
371 reg = HVS_READ(SCALER6_CONTROL);
372 HVS_WRITE(SCALER6_CONTROL,
373 (reg & ~SCALER6_CONTROL_DSP1_TARGET_MASK) |
374 VC4_SET_FIELD(mux, SCALER6_CONTROL_DSP1_TARGET));
375 }
376 }
377
vc4_atomic_commit_tail(struct drm_atomic_state * state)378 static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
379 {
380 struct drm_device *dev = state->dev;
381 struct vc4_dev *vc4 = to_vc4_dev(dev);
382 struct vc4_hvs *hvs = vc4->hvs;
383 struct vc4_hvs_state *new_hvs_state;
384 struct vc4_hvs_state *old_hvs_state;
385 unsigned int channel;
386
387 old_hvs_state = vc4_hvs_get_old_global_state(state);
388 if (WARN_ON(IS_ERR(old_hvs_state)))
389 return;
390
391 new_hvs_state = vc4_hvs_get_new_global_state(state);
392 if (WARN_ON(IS_ERR(new_hvs_state)))
393 return;
394
395 if (vc4->gen < VC4_GEN_6_C) {
396 struct drm_crtc_state *new_crtc_state;
397 struct drm_crtc *crtc;
398 int i;
399
400 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
401 struct vc4_crtc_state *vc4_crtc_state;
402
403 if (!new_crtc_state->commit)
404 continue;
405
406 vc4_crtc_state = to_vc4_crtc_state(new_crtc_state);
407 vc4_hvs_mask_underrun(hvs, vc4_crtc_state->assigned_channel);
408 }
409 }
410
411 for (channel = 0; channel < HVS_NUM_CHANNELS; channel++) {
412 struct drm_crtc_commit *commit;
413 int ret;
414
415 if (!old_hvs_state->fifo_state[channel].in_use)
416 continue;
417
418 commit = old_hvs_state->fifo_state[channel].pending_commit;
419 if (!commit)
420 continue;
421
422 ret = drm_crtc_commit_wait(commit);
423 if (ret)
424 drm_err(dev, "Timed out waiting for commit\n");
425
426 drm_crtc_commit_put(commit);
427 old_hvs_state->fifo_state[channel].pending_commit = NULL;
428 }
429
430 if (vc4->gen == VC4_GEN_5) {
431 unsigned long state_rate = max(old_hvs_state->core_clock_rate,
432 new_hvs_state->core_clock_rate);
433 unsigned long core_rate = clamp_t(unsigned long, state_rate,
434 500000000, hvs->max_core_rate);
435
436 drm_dbg(dev, "Raising the core clock at %lu Hz\n", core_rate);
437
438 /*
439 * Do a temporary request on the core clock during the
440 * modeset.
441 */
442 WARN_ON(clk_set_min_rate(hvs->core_clk, core_rate));
443 WARN_ON(clk_set_min_rate(hvs->disp_clk, core_rate));
444 }
445
446 drm_atomic_helper_commit_modeset_disables(dev, state);
447
448 if (vc4->gen <= VC4_GEN_5)
449 vc4_ctm_commit(vc4, state);
450
451 switch (vc4->gen) {
452 case VC4_GEN_4:
453 vc4_hvs_pv_muxing_commit(vc4, state);
454 break;
455
456 case VC4_GEN_5:
457 vc5_hvs_pv_muxing_commit(vc4, state);
458 break;
459
460 case VC4_GEN_6_C:
461 case VC4_GEN_6_D:
462 vc6_hvs_pv_muxing_commit(vc4, state);
463 break;
464
465 default:
466 drm_err(dev, "Unknown VC4 generation: %d", vc4->gen);
467 break;
468 }
469
470 drm_atomic_helper_commit_planes(dev, state,
471 DRM_PLANE_COMMIT_ACTIVE_ONLY);
472
473 drm_atomic_helper_commit_modeset_enables(dev, state);
474
475 drm_atomic_helper_fake_vblank(state);
476
477 drm_atomic_helper_commit_hw_done(state);
478
479 drm_atomic_helper_wait_for_flip_done(dev, state);
480
481 drm_atomic_helper_cleanup_planes(dev, state);
482
483 if (vc4->gen == VC4_GEN_5) {
484 unsigned long core_rate = min_t(unsigned long,
485 hvs->max_core_rate,
486 new_hvs_state->core_clock_rate);
487
488 drm_dbg(dev, "Running the core clock at %lu Hz\n", core_rate);
489
490 /*
491 * Request a clock rate based on the current HVS
492 * requirements.
493 */
494 WARN_ON(clk_set_min_rate(hvs->core_clk, core_rate));
495 WARN_ON(clk_set_min_rate(hvs->disp_clk, core_rate));
496
497 drm_dbg(dev, "Core clock actual rate: %lu Hz\n",
498 clk_get_rate(hvs->core_clk));
499 }
500 }
501
vc4_atomic_commit_setup(struct drm_atomic_state * state)502 static int vc4_atomic_commit_setup(struct drm_atomic_state *state)
503 {
504 struct drm_crtc_state *crtc_state;
505 struct vc4_hvs_state *hvs_state;
506 struct drm_crtc *crtc;
507 unsigned int i;
508
509 hvs_state = vc4_hvs_get_new_global_state(state);
510 if (WARN_ON(IS_ERR(hvs_state)))
511 return PTR_ERR(hvs_state);
512
513 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
514 struct vc4_crtc_state *vc4_crtc_state =
515 to_vc4_crtc_state(crtc_state);
516 unsigned int channel =
517 vc4_crtc_state->assigned_channel;
518
519 if (channel == VC4_HVS_CHANNEL_DISABLED)
520 continue;
521
522 if (!hvs_state->fifo_state[channel].in_use)
523 continue;
524
525 hvs_state->fifo_state[channel].pending_commit =
526 drm_crtc_commit_get(crtc_state->commit);
527 }
528
529 return 0;
530 }
531
vc4_fb_create(struct drm_device * dev,struct drm_file * file_priv,const struct drm_format_info * info,const struct drm_mode_fb_cmd2 * mode_cmd)532 static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev,
533 struct drm_file *file_priv,
534 const struct drm_format_info *info,
535 const struct drm_mode_fb_cmd2 *mode_cmd)
536 {
537 struct vc4_dev *vc4 = to_vc4_dev(dev);
538 struct drm_mode_fb_cmd2 mode_cmd_local;
539
540 if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
541 return ERR_PTR(-ENODEV);
542
543 /* If the user didn't specify a modifier, use the
544 * vc4_set_tiling_ioctl() state for the BO.
545 */
546 if (!(mode_cmd->flags & DRM_MODE_FB_MODIFIERS)) {
547 struct drm_gem_object *gem_obj;
548 struct vc4_bo *bo;
549
550 gem_obj = drm_gem_object_lookup(file_priv,
551 mode_cmd->handles[0]);
552 if (!gem_obj) {
553 DRM_DEBUG("Failed to look up GEM BO %d\n",
554 mode_cmd->handles[0]);
555 return ERR_PTR(-ENOENT);
556 }
557 bo = to_vc4_bo(gem_obj);
558
559 mode_cmd_local = *mode_cmd;
560
561 if (bo->t_format) {
562 mode_cmd_local.modifier[0] =
563 DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
564 } else {
565 mode_cmd_local.modifier[0] = DRM_FORMAT_MOD_NONE;
566 }
567
568 drm_gem_object_put(gem_obj);
569
570 mode_cmd = &mode_cmd_local;
571 }
572
573 return drm_gem_fb_create(dev, file_priv, info, mode_cmd);
574 }
575
576 /* Our CTM has some peculiar limitations: we can only enable it for one CRTC
577 * at a time and the HW only supports S0.9 scalars. To account for the latter,
578 * we don't allow userland to set a CTM that we have no hope of approximating.
579 */
580 static int
vc4_ctm_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)581 vc4_ctm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
582 {
583 struct vc4_dev *vc4 = to_vc4_dev(dev);
584 struct vc4_ctm_state *ctm_state = NULL;
585 struct drm_crtc *crtc;
586 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
587 struct drm_color_ctm *ctm;
588 int i;
589
590 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
591 /* CTM is being disabled. */
592 if (!new_crtc_state->ctm && old_crtc_state->ctm) {
593 ctm_state = vc4_get_ctm_state(state, &vc4->ctm_manager);
594 if (IS_ERR(ctm_state))
595 return PTR_ERR(ctm_state);
596 ctm_state->fifo = 0;
597 }
598 }
599
600 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
601 if (new_crtc_state->ctm == old_crtc_state->ctm)
602 continue;
603
604 if (!ctm_state) {
605 ctm_state = vc4_get_ctm_state(state, &vc4->ctm_manager);
606 if (IS_ERR(ctm_state))
607 return PTR_ERR(ctm_state);
608 }
609
610 /* CTM is being enabled or the matrix changed. */
611 if (new_crtc_state->ctm) {
612 struct vc4_crtc_state *vc4_crtc_state =
613 to_vc4_crtc_state(new_crtc_state);
614
615 /* fifo is 1-based since 0 disables CTM. */
616 int fifo = vc4_crtc_state->assigned_channel + 1;
617
618 /* Check userland isn't trying to turn on CTM for more
619 * than one CRTC at a time.
620 */
621 if (ctm_state->fifo && ctm_state->fifo != fifo) {
622 DRM_DEBUG_DRIVER("Too many CTM configured\n");
623 return -EINVAL;
624 }
625
626 /* Check we can approximate the specified CTM.
627 * We disallow scalars |c| > 1.0 since the HW has
628 * no integer bits.
629 */
630 ctm = new_crtc_state->ctm->data;
631 for (i = 0; i < ARRAY_SIZE(ctm->matrix); i++) {
632 u64 val = ctm->matrix[i];
633
634 val &= ~BIT_ULL(63);
635 if (val > BIT_ULL(32))
636 return -EINVAL;
637 }
638
639 ctm_state->fifo = fifo;
640 ctm_state->ctm = ctm;
641 }
642 }
643
644 return 0;
645 }
646
vc4_load_tracker_atomic_check(struct drm_atomic_state * state)647 static int vc4_load_tracker_atomic_check(struct drm_atomic_state *state)
648 {
649 struct drm_plane_state *old_plane_state, *new_plane_state;
650 struct vc4_dev *vc4 = to_vc4_dev(state->dev);
651 struct vc4_load_tracker_state *load_state;
652 struct drm_private_state *priv_state;
653 struct drm_plane *plane;
654 int i;
655
656 priv_state = drm_atomic_get_private_obj_state(state,
657 &vc4->load_tracker);
658 if (IS_ERR(priv_state))
659 return PTR_ERR(priv_state);
660
661 load_state = to_vc4_load_tracker_state(priv_state);
662 for_each_oldnew_plane_in_state(state, plane, old_plane_state,
663 new_plane_state, i) {
664 struct vc4_plane_state *vc4_plane_state;
665
666 if (old_plane_state->fb && old_plane_state->crtc) {
667 vc4_plane_state = to_vc4_plane_state(old_plane_state);
668 load_state->membus_load -= vc4_plane_state->membus_load;
669 load_state->hvs_load -= vc4_plane_state->hvs_load;
670 }
671
672 if (new_plane_state->fb && new_plane_state->crtc) {
673 vc4_plane_state = to_vc4_plane_state(new_plane_state);
674 load_state->membus_load += vc4_plane_state->membus_load;
675 load_state->hvs_load += vc4_plane_state->hvs_load;
676 }
677 }
678
679 /* Don't check the load when the tracker is disabled. */
680 if (!vc4->load_tracker_enabled)
681 return 0;
682
683 /* The absolute limit is 2Gbyte/sec, but let's take a margin to let
684 * the system work when other blocks are accessing the memory.
685 */
686 if (load_state->membus_load > SZ_1G + SZ_512M)
687 return -ENOSPC;
688
689 /* HVS clock is supposed to run @ 250Mhz, let's take a margin and
690 * consider the maximum number of cycles is 240M.
691 */
692 if (load_state->hvs_load > 240000000ULL)
693 return -ENOSPC;
694
695 return 0;
696 }
697
698 static struct drm_private_state *
vc4_load_tracker_duplicate_state(struct drm_private_obj * obj)699 vc4_load_tracker_duplicate_state(struct drm_private_obj *obj)
700 {
701 struct vc4_load_tracker_state *state;
702
703 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL);
704 if (!state)
705 return NULL;
706
707 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
708
709 return &state->base;
710 }
711
vc4_load_tracker_destroy_state(struct drm_private_obj * obj,struct drm_private_state * state)712 static void vc4_load_tracker_destroy_state(struct drm_private_obj *obj,
713 struct drm_private_state *state)
714 {
715 struct vc4_load_tracker_state *load_state;
716
717 load_state = to_vc4_load_tracker_state(state);
718 kfree(load_state);
719 }
720
721 static const struct drm_private_state_funcs vc4_load_tracker_state_funcs = {
722 .atomic_duplicate_state = vc4_load_tracker_duplicate_state,
723 .atomic_destroy_state = vc4_load_tracker_destroy_state,
724 };
725
vc4_load_tracker_obj_fini(struct drm_device * dev,void * unused)726 static void vc4_load_tracker_obj_fini(struct drm_device *dev, void *unused)
727 {
728 struct vc4_dev *vc4 = to_vc4_dev(dev);
729
730 drm_atomic_private_obj_fini(&vc4->load_tracker);
731 }
732
vc4_load_tracker_obj_init(struct vc4_dev * vc4)733 static int vc4_load_tracker_obj_init(struct vc4_dev *vc4)
734 {
735 struct vc4_load_tracker_state *load_state;
736
737 load_state = kzalloc_obj(*load_state);
738 if (!load_state)
739 return -ENOMEM;
740
741 drm_atomic_private_obj_init(&vc4->base, &vc4->load_tracker,
742 &load_state->base,
743 &vc4_load_tracker_state_funcs);
744
745 return drmm_add_action_or_reset(&vc4->base, vc4_load_tracker_obj_fini, NULL);
746 }
747
748 static struct drm_private_state *
vc4_hvs_channels_duplicate_state(struct drm_private_obj * obj)749 vc4_hvs_channels_duplicate_state(struct drm_private_obj *obj)
750 {
751 struct vc4_hvs_state *old_state = to_vc4_hvs_state(obj->state);
752 struct vc4_hvs_state *state;
753 unsigned int i;
754
755 state = kzalloc_obj(*state);
756 if (!state)
757 return NULL;
758
759 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
760
761 for (i = 0; i < HVS_NUM_CHANNELS; i++) {
762 state->fifo_state[i].in_use = old_state->fifo_state[i].in_use;
763 state->fifo_state[i].fifo_load = old_state->fifo_state[i].fifo_load;
764 }
765
766 state->core_clock_rate = old_state->core_clock_rate;
767
768 return &state->base;
769 }
770
vc4_hvs_channels_destroy_state(struct drm_private_obj * obj,struct drm_private_state * state)771 static void vc4_hvs_channels_destroy_state(struct drm_private_obj *obj,
772 struct drm_private_state *state)
773 {
774 struct vc4_hvs_state *hvs_state = to_vc4_hvs_state(state);
775 unsigned int i;
776
777 for (i = 0; i < HVS_NUM_CHANNELS; i++) {
778 if (!hvs_state->fifo_state[i].pending_commit)
779 continue;
780
781 drm_crtc_commit_put(hvs_state->fifo_state[i].pending_commit);
782 }
783
784 kfree(hvs_state);
785 }
786
vc4_hvs_channels_print_state(struct drm_printer * p,const struct drm_private_state * state)787 static void vc4_hvs_channels_print_state(struct drm_printer *p,
788 const struct drm_private_state *state)
789 {
790 const struct vc4_hvs_state *hvs_state = to_vc4_hvs_state(state);
791 unsigned int i;
792
793 drm_printf(p, "HVS State\n");
794 drm_printf(p, "\tCore Clock Rate: %lu\n", hvs_state->core_clock_rate);
795
796 for (i = 0; i < HVS_NUM_CHANNELS; i++) {
797 drm_printf(p, "\tChannel %d\n", i);
798 drm_printf(p, "\t\tin use=%d\n", hvs_state->fifo_state[i].in_use);
799 drm_printf(p, "\t\tload=%lu\n", hvs_state->fifo_state[i].fifo_load);
800 }
801 }
802
803 static const struct drm_private_state_funcs vc4_hvs_state_funcs = {
804 .atomic_duplicate_state = vc4_hvs_channels_duplicate_state,
805 .atomic_destroy_state = vc4_hvs_channels_destroy_state,
806 .atomic_print_state = vc4_hvs_channels_print_state,
807 };
808
vc4_hvs_channels_obj_fini(struct drm_device * dev,void * unused)809 static void vc4_hvs_channels_obj_fini(struct drm_device *dev, void *unused)
810 {
811 struct vc4_dev *vc4 = to_vc4_dev(dev);
812
813 drm_atomic_private_obj_fini(&vc4->hvs_channels);
814 }
815
vc4_hvs_channels_obj_init(struct vc4_dev * vc4)816 static int vc4_hvs_channels_obj_init(struct vc4_dev *vc4)
817 {
818 struct vc4_hvs_state *state;
819
820 state = kzalloc_obj(*state);
821 if (!state)
822 return -ENOMEM;
823
824 drm_atomic_private_obj_init(&vc4->base, &vc4->hvs_channels,
825 &state->base,
826 &vc4_hvs_state_funcs);
827
828 return drmm_add_action_or_reset(&vc4->base, vc4_hvs_channels_obj_fini, NULL);
829 }
830
cmp_vc4_crtc_hvs_output(const void * a,const void * b)831 static int cmp_vc4_crtc_hvs_output(const void *a, const void *b)
832 {
833 const struct vc4_crtc *crtc_a =
834 to_vc4_crtc(*(const struct drm_crtc **)a);
835 const struct vc4_crtc_data *data_a =
836 vc4_crtc_to_vc4_crtc_data(crtc_a);
837 const struct vc4_crtc *crtc_b =
838 to_vc4_crtc(*(const struct drm_crtc **)b);
839 const struct vc4_crtc_data *data_b =
840 vc4_crtc_to_vc4_crtc_data(crtc_b);
841
842 return data_a->hvs_output - data_b->hvs_output;
843 }
844
845 /*
846 * The BCM2711 HVS has up to 7 outputs connected to the pixelvalves and
847 * the TXP (and therefore all the CRTCs found on that platform).
848 *
849 * The naive (and our initial) implementation would just iterate over
850 * all the active CRTCs, try to find a suitable FIFO, and then remove it
851 * from the pool of available FIFOs. However, there are a few corner
852 * cases that need to be considered:
853 *
854 * - When running in a dual-display setup (so with two CRTCs involved),
855 * we can update the state of a single CRTC (for example by changing
856 * its mode using xrandr under X11) without affecting the other. In
857 * this case, the other CRTC wouldn't be in the state at all, so we
858 * need to consider all the running CRTCs in the DRM device to assign
859 * a FIFO, not just the one in the state.
860 *
861 * - To fix the above, we can't use drm_atomic_get_crtc_state on all
862 * enabled CRTCs to pull their CRTC state into the global state, since
863 * a page flip would start considering their vblank to complete. Since
864 * we don't have a guarantee that they are actually active, that
865 * vblank might never happen, and shouldn't even be considered if we
866 * want to do a page flip on a single CRTC. That can be tested by
867 * doing a modetest -v first on HDMI1 and then on HDMI0.
868 *
869 * - Since we need the pixelvalve to be disabled and enabled back when
870 * the FIFO is changed, we should keep the FIFO assigned for as long
871 * as the CRTC is enabled, only considering it free again once that
872 * CRTC has been disabled. This can be tested by booting X11 on a
873 * single display, and changing the resolution down and then back up.
874 */
vc4_pv_muxing_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)875 static int vc4_pv_muxing_atomic_check(struct drm_device *dev,
876 struct drm_atomic_state *state)
877 {
878 struct vc4_hvs_state *hvs_new_state;
879 struct drm_crtc **sorted_crtcs;
880 struct drm_crtc *crtc;
881 unsigned int unassigned_channels = 0;
882 unsigned int i;
883 int ret;
884
885 hvs_new_state = vc4_hvs_get_global_state(state);
886 if (IS_ERR(hvs_new_state))
887 return PTR_ERR(hvs_new_state);
888
889 for (i = 0; i < ARRAY_SIZE(hvs_new_state->fifo_state); i++)
890 if (!hvs_new_state->fifo_state[i].in_use)
891 unassigned_channels |= BIT(i);
892
893 /*
894 * The problem we have to solve here is that we have up to 7
895 * encoders, connected to up to 6 CRTCs.
896 *
897 * Those CRTCs, depending on the instance, can be routed to 1, 2
898 * or 3 HVS FIFOs, and we need to set the muxing between FIFOs and
899 * outputs in the HVS accordingly.
900 *
901 * It would be pretty hard to come up with an algorithm that
902 * would generically solve this. However, the current routing
903 * trees we support allow us to simplify a bit the problem.
904 *
905 * Indeed, with the current supported layouts, if we try to
906 * assign in the ascending crtc index order the FIFOs, we can't
907 * fall into the situation where an earlier CRTC that had
908 * multiple routes is assigned one that was the only option for
909 * a later CRTC.
910 *
911 * If the layout changes and doesn't give us that in the future,
912 * we will need to have something smarter, but it works so far.
913 */
914 sorted_crtcs = kmalloc_objs(*sorted_crtcs, dev->num_crtcs);
915 if (!sorted_crtcs)
916 return -ENOMEM;
917
918 i = 0;
919 drm_for_each_crtc(crtc, dev)
920 sorted_crtcs[i++] = crtc;
921
922 sort(sorted_crtcs, i, sizeof(*sorted_crtcs), cmp_vc4_crtc_hvs_output, NULL);
923
924 for (i = 0; i < dev->num_crtcs; i++) {
925 struct vc4_crtc_state *old_vc4_crtc_state, *new_vc4_crtc_state;
926 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
927 struct vc4_crtc *vc4_crtc;
928 unsigned int matching_channels;
929 unsigned int channel;
930
931 crtc = sorted_crtcs[i];
932 if (!crtc)
933 continue;
934 vc4_crtc = to_vc4_crtc(crtc);
935
936 old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
937 if (!old_crtc_state)
938 continue;
939 old_vc4_crtc_state = to_vc4_crtc_state(old_crtc_state);
940
941 new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
942 if (!new_crtc_state)
943 continue;
944 new_vc4_crtc_state = to_vc4_crtc_state(new_crtc_state);
945
946 drm_dbg(dev, "%s: Trying to find a channel.\n", crtc->name);
947
948 /* Nothing to do here, let's skip it */
949 if (old_crtc_state->enable == new_crtc_state->enable) {
950 if (new_crtc_state->enable)
951 drm_dbg(dev, "%s: Already enabled, reusing channel %d.\n",
952 crtc->name, new_vc4_crtc_state->assigned_channel);
953 else
954 drm_dbg(dev, "%s: Disabled, ignoring.\n", crtc->name);
955
956 continue;
957 }
958
959 /* Muxing will need to be modified, mark it as such */
960 new_vc4_crtc_state->update_muxing = true;
961
962 /* If we're disabling our CRTC, we put back our channel */
963 if (!new_crtc_state->enable) {
964 channel = old_vc4_crtc_state->assigned_channel;
965
966 drm_dbg(dev, "%s: Disabling, Freeing channel %d\n",
967 crtc->name, channel);
968
969 hvs_new_state->fifo_state[channel].in_use = false;
970 new_vc4_crtc_state->assigned_channel = VC4_HVS_CHANNEL_DISABLED;
971 continue;
972 }
973
974 matching_channels = unassigned_channels & vc4_crtc->data->hvs_available_channels;
975 if (!matching_channels) {
976 ret = -EINVAL;
977 goto err_free_crtc_array;
978 }
979
980 channel = ffs(matching_channels) - 1;
981
982 drm_dbg(dev, "Assigned HVS channel %d to CRTC %s\n", channel, crtc->name);
983 new_vc4_crtc_state->assigned_channel = channel;
984 unassigned_channels &= ~BIT(channel);
985 hvs_new_state->fifo_state[channel].in_use = true;
986 }
987
988 kfree(sorted_crtcs);
989 return 0;
990
991 err_free_crtc_array:
992 kfree(sorted_crtcs);
993 return ret;
994 }
995
996 static int
vc4_core_clock_atomic_check(struct drm_atomic_state * state)997 vc4_core_clock_atomic_check(struct drm_atomic_state *state)
998 {
999 struct vc4_dev *vc4 = to_vc4_dev(state->dev);
1000 struct drm_private_state *priv_state;
1001 struct vc4_hvs_state *hvs_new_state;
1002 struct vc4_load_tracker_state *load_state;
1003 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1004 struct drm_crtc *crtc;
1005 unsigned int num_outputs;
1006 unsigned long pixel_rate;
1007 unsigned long cob_rate;
1008 unsigned int i;
1009
1010 priv_state = drm_atomic_get_private_obj_state(state,
1011 &vc4->load_tracker);
1012 if (IS_ERR(priv_state))
1013 return PTR_ERR(priv_state);
1014
1015 load_state = to_vc4_load_tracker_state(priv_state);
1016
1017 hvs_new_state = vc4_hvs_get_global_state(state);
1018 if (IS_ERR(hvs_new_state))
1019 return PTR_ERR(hvs_new_state);
1020
1021 for_each_oldnew_crtc_in_state(state, crtc,
1022 old_crtc_state,
1023 new_crtc_state,
1024 i) {
1025 if (old_crtc_state->active) {
1026 struct vc4_crtc_state *old_vc4_state =
1027 to_vc4_crtc_state(old_crtc_state);
1028 unsigned int channel = old_vc4_state->assigned_channel;
1029
1030 hvs_new_state->fifo_state[channel].fifo_load = 0;
1031 }
1032
1033 if (new_crtc_state->active) {
1034 struct vc4_crtc_state *new_vc4_state =
1035 to_vc4_crtc_state(new_crtc_state);
1036 unsigned int channel = new_vc4_state->assigned_channel;
1037
1038 hvs_new_state->fifo_state[channel].fifo_load =
1039 new_vc4_state->hvs_load;
1040 }
1041 }
1042
1043 cob_rate = 0;
1044 num_outputs = 0;
1045 for (i = 0; i < HVS_NUM_CHANNELS; i++) {
1046 if (!hvs_new_state->fifo_state[i].in_use)
1047 continue;
1048
1049 num_outputs++;
1050 cob_rate = max_t(unsigned long,
1051 hvs_new_state->fifo_state[i].fifo_load,
1052 cob_rate);
1053 }
1054
1055 pixel_rate = load_state->hvs_load;
1056 if (num_outputs > 1) {
1057 pixel_rate = (pixel_rate * 40) / 100;
1058 } else {
1059 pixel_rate = (pixel_rate * 60) / 100;
1060 }
1061
1062 hvs_new_state->core_clock_rate = max(cob_rate, pixel_rate);
1063
1064 return 0;
1065 }
1066
1067
1068 static int
vc4_atomic_check(struct drm_device * dev,struct drm_atomic_state * state)1069 vc4_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
1070 {
1071 int ret;
1072
1073 ret = vc4_pv_muxing_atomic_check(dev, state);
1074 if (ret)
1075 return ret;
1076
1077 ret = vc4_ctm_atomic_check(dev, state);
1078 if (ret < 0)
1079 return ret;
1080
1081 ret = drm_atomic_helper_check(dev, state);
1082 if (ret)
1083 return ret;
1084
1085 ret = vc4_load_tracker_atomic_check(state);
1086 if (ret)
1087 return ret;
1088
1089 return vc4_core_clock_atomic_check(state);
1090 }
1091
1092 static struct drm_mode_config_helper_funcs vc4_mode_config_helpers = {
1093 .atomic_commit_setup = vc4_atomic_commit_setup,
1094 .atomic_commit_tail = vc4_atomic_commit_tail,
1095 };
1096
1097 static const struct drm_mode_config_funcs vc4_mode_funcs = {
1098 .atomic_check = vc4_atomic_check,
1099 .atomic_commit = drm_atomic_helper_commit,
1100 .fb_create = vc4_fb_create,
1101 };
1102
1103 static const struct drm_mode_config_funcs vc5_mode_funcs = {
1104 .atomic_check = vc4_atomic_check,
1105 .atomic_commit = drm_atomic_helper_commit,
1106 .fb_create = drm_gem_fb_create,
1107 };
1108
vc4_kms_load(struct drm_device * dev)1109 int vc4_kms_load(struct drm_device *dev)
1110 {
1111 struct vc4_dev *vc4 = to_vc4_dev(dev);
1112 int ret;
1113
1114 /*
1115 * The limits enforced by the load tracker aren't relevant for
1116 * the BCM2711, but the load tracker computations are used for
1117 * the core clock rate calculation.
1118 */
1119 if (vc4->gen == VC4_GEN_4) {
1120 /* Start with the load tracker enabled. Can be
1121 * disabled through the debugfs load_tracker file.
1122 */
1123 vc4->load_tracker_enabled = true;
1124 }
1125
1126 /* Set support for vblank irq fast disable, before drm_vblank_init() */
1127 dev->vblank_disable_immediate = true;
1128
1129 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
1130 if (ret < 0) {
1131 dev_err(dev->dev, "failed to initialize vblank\n");
1132 return ret;
1133 }
1134
1135 if (vc4->gen >= VC4_GEN_6_C) {
1136 dev->mode_config.max_width = 8192;
1137 dev->mode_config.max_height = 8192;
1138 } else if (vc4->gen >= VC4_GEN_5) {
1139 dev->mode_config.max_width = 7680;
1140 dev->mode_config.max_height = 7680;
1141 } else {
1142 dev->mode_config.max_width = 2048;
1143 dev->mode_config.max_height = 2048;
1144 }
1145
1146 dev->mode_config.funcs = (vc4->gen > VC4_GEN_4) ? &vc5_mode_funcs : &vc4_mode_funcs;
1147 dev->mode_config.helper_private = &vc4_mode_config_helpers;
1148 dev->mode_config.preferred_depth = 24;
1149 dev->mode_config.async_page_flip = true;
1150 dev->mode_config.normalize_zpos = true;
1151
1152 ret = vc4_ctm_obj_init(vc4);
1153 if (ret)
1154 return ret;
1155
1156 ret = vc4_load_tracker_obj_init(vc4);
1157 if (ret)
1158 return ret;
1159
1160 ret = vc4_hvs_channels_obj_init(vc4);
1161 if (ret)
1162 return ret;
1163
1164 drm_mode_config_reset(dev);
1165
1166 drm_kms_helper_poll_init(dev);
1167
1168 return 0;
1169 }
1170