1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
5 */
6
7#include <drm/drm_atomic.h>
8#include <drm/drm_atomic_helper.h>
9#include <drm/drm_crtc.h>
10#include <drm/drm_gem_dma_helper.h>
11#include <drm/drm_vblank.h>
12
13#include "tidss_crtc.h"
14#include "tidss_dispc.h"
15#include "tidss_drv.h"
16#include "tidss_irq.h"
17#include "tidss_plane.h"
18
19/* Page flip and frame done IRQs */
20
21static void tidss_crtc_finish_page_flip(struct tidss_crtc *tcrtc)
22{
23 struct drm_device *ddev = tcrtc->crtc.dev;
24 struct tidss_device *tidss = to_tidss(ddev);
25 struct drm_pending_vblank_event *event;
26 unsigned long flags;
27 bool busy;
28
29 spin_lock_irqsave(&ddev->event_lock, flags);
30
31 /*
32 * New settings are taken into use at VFP, and GO bit is cleared at
33 * the same time. This happens before the vertical blank interrupt.
34 * So there is a small change that the driver sets GO bit after VFP, but
35 * before vblank, and we have to check for that case here.
36 */
37 busy = dispc_vp_go_busy(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport);
38 if (busy) {
39 spin_unlock_irqrestore(lock: &ddev->event_lock, flags);
40 return;
41 }
42
43 event = tcrtc->event;
44 tcrtc->event = NULL;
45
46 if (!event) {
47 spin_unlock_irqrestore(lock: &ddev->event_lock, flags);
48 return;
49 }
50
51 drm_crtc_send_vblank_event(crtc: &tcrtc->crtc, e: event);
52
53 spin_unlock_irqrestore(lock: &ddev->event_lock, flags);
54
55 drm_crtc_vblank_put(crtc: &tcrtc->crtc);
56}
57
58void tidss_crtc_vblank_irq(struct drm_crtc *crtc)
59{
60 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
61
62 drm_crtc_handle_vblank(crtc);
63
64 tidss_crtc_finish_page_flip(tcrtc);
65}
66
67void tidss_crtc_framedone_irq(struct drm_crtc *crtc)
68{
69 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
70
71 complete(&tcrtc->framedone_completion);
72}
73
74void tidss_crtc_error_irq(struct drm_crtc *crtc, u64 irqstatus)
75{
76 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
77
78 dev_err_ratelimited(crtc->dev->dev, "CRTC%u SYNC LOST: (irq %llx)\n",
79 tcrtc->hw_videoport, irqstatus);
80}
81
82/* drm_crtc_helper_funcs */
83
84static int tidss_crtc_atomic_check(struct drm_crtc *crtc,
85 struct drm_atomic_state *state)
86{
87 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
88 crtc);
89 struct drm_device *ddev = crtc->dev;
90 struct tidss_device *tidss = to_tidss(ddev);
91 struct dispc_device *dispc = tidss->dispc;
92 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
93 u32 hw_videoport = tcrtc->hw_videoport;
94 const struct drm_display_mode *mode;
95 enum drm_mode_status ok;
96
97 dev_dbg(ddev->dev, "%s\n", __func__);
98
99 if (!crtc_state->enable)
100 return 0;
101
102 mode = &crtc_state->adjusted_mode;
103
104 ok = dispc_vp_mode_valid(dispc, hw_videoport, mode);
105 if (ok != MODE_OK) {
106 dev_dbg(ddev->dev, "%s: bad mode: %ux%u pclk %u kHz\n",
107 __func__, mode->hdisplay, mode->vdisplay, mode->clock);
108 return -EINVAL;
109 }
110
111 return dispc_vp_bus_check(dispc, hw_videoport, state: crtc_state);
112}
113
114/*
115 * This needs all affected planes to be present in the atomic
116 * state. The untouched planes are added to the state in
117 * tidss_atomic_check().
118 */
119static void tidss_crtc_position_planes(struct tidss_device *tidss,
120 struct drm_crtc *crtc,
121 struct drm_crtc_state *old_state,
122 bool newmodeset)
123{
124 struct drm_atomic_state *ostate = old_state->state;
125 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
126 struct drm_crtc_state *cstate = crtc->state;
127 int layer;
128
129 if (!newmodeset && !cstate->zpos_changed &&
130 !to_tidss_crtc_state(cstate)->plane_pos_changed)
131 return;
132
133 for (layer = 0; layer < tidss->feat->num_planes; layer++) {
134 struct drm_plane_state *pstate;
135 struct drm_plane *plane;
136 bool layer_active = false;
137 int i;
138
139 for_each_new_plane_in_state(ostate, plane, pstate, i) {
140 if (pstate->crtc != crtc || !pstate->visible)
141 continue;
142
143 if (pstate->normalized_zpos == layer) {
144 layer_active = true;
145 break;
146 }
147 }
148
149 if (layer_active) {
150 struct tidss_plane *tplane = to_tidss_plane(plane);
151
152 dispc_ovr_set_plane(dispc: tidss->dispc, hw_plane: tplane->hw_plane_id,
153 hw_videoport: tcrtc->hw_videoport,
154 x: pstate->crtc_x, y: pstate->crtc_y,
155 layer);
156 }
157 dispc_ovr_enable_layer(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, layer,
158 enable: layer_active);
159 }
160}
161
162static void tidss_crtc_atomic_flush(struct drm_crtc *crtc,
163 struct drm_atomic_state *state)
164{
165 struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
166 crtc);
167 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
168 struct drm_device *ddev = crtc->dev;
169 struct tidss_device *tidss = to_tidss(ddev);
170 unsigned long flags;
171
172 dev_dbg(ddev->dev, "%s: %s is %sactive, %s modeset, event %p\n",
173 __func__, crtc->name, crtc->state->active ? "" : "not ",
174 drm_atomic_crtc_needs_modeset(crtc->state) ? "needs" : "doesn't need",
175 crtc->state->event);
176
177 /*
178 * Flush CRTC changes with go bit only if new modeset is not
179 * coming, so CRTC is enabled trough out the commit.
180 */
181 if (drm_atomic_crtc_needs_modeset(state: crtc->state))
182 return;
183
184 /* If the GO bit is stuck we better quit here. */
185 if (WARN_ON(dispc_vp_go_busy(tidss->dispc, tcrtc->hw_videoport)))
186 return;
187
188 /* We should have event if CRTC is enabled through out this commit. */
189 if (WARN_ON(!crtc->state->event))
190 return;
191
192 /* Write vp properties to HW if needed. */
193 dispc_vp_setup(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, state: crtc->state, newmodeset: false);
194
195 /* Update plane positions if needed. */
196 tidss_crtc_position_planes(tidss, crtc, old_state: old_crtc_state, newmodeset: false);
197
198 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
199
200 spin_lock_irqsave(&ddev->event_lock, flags);
201 dispc_vp_go(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport);
202
203 WARN_ON(tcrtc->event);
204
205 tcrtc->event = crtc->state->event;
206 crtc->state->event = NULL;
207
208 spin_unlock_irqrestore(lock: &ddev->event_lock, flags);
209}
210
211static void tidss_crtc_atomic_enable(struct drm_crtc *crtc,
212 struct drm_atomic_state *state)
213{
214 struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
215 crtc);
216 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
217 struct drm_device *ddev = crtc->dev;
218 struct tidss_device *tidss = to_tidss(ddev);
219 const struct drm_display_mode *mode = &crtc->state->adjusted_mode;
220 unsigned long flags;
221 int r;
222
223 dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
224
225 tidss_runtime_get(tidss);
226
227 r = dispc_vp_set_clk_rate(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport,
228 rate: mode->clock * 1000);
229 if (r != 0)
230 return;
231
232 r = dispc_vp_enable_clk(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport);
233 if (r != 0)
234 return;
235
236 dispc_vp_setup(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, state: crtc->state, newmodeset: true);
237 tidss_crtc_position_planes(tidss, crtc, old_state, newmodeset: true);
238
239 /* Turn vertical blanking interrupt reporting on. */
240 drm_crtc_vblank_on(crtc);
241
242 dispc_vp_prepare(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, state: crtc->state);
243
244 dispc_vp_enable(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, state: crtc->state);
245
246 spin_lock_irqsave(&ddev->event_lock, flags);
247
248 if (crtc->state->event) {
249 drm_crtc_send_vblank_event(crtc, e: crtc->state->event);
250 crtc->state->event = NULL;
251 }
252
253 spin_unlock_irqrestore(lock: &ddev->event_lock, flags);
254}
255
256static void tidss_crtc_atomic_disable(struct drm_crtc *crtc,
257 struct drm_atomic_state *state)
258{
259 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
260 struct drm_device *ddev = crtc->dev;
261 struct tidss_device *tidss = to_tidss(ddev);
262 unsigned long flags;
263
264 dev_dbg(ddev->dev, "%s, event %p\n", __func__, crtc->state->event);
265
266 reinit_completion(x: &tcrtc->framedone_completion);
267
268 /*
269 * If a layer is left enabled when the videoport is disabled, and the
270 * vid pipeline that was used for the layer is taken into use on
271 * another videoport, the DSS will report sync lost issues. Disable all
272 * the layers here as a work-around.
273 */
274 for (u32 layer = 0; layer < tidss->feat->num_planes; layer++)
275 dispc_ovr_enable_layer(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, layer,
276 enable: false);
277
278 dispc_vp_disable(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport);
279
280 if (!wait_for_completion_timeout(x: &tcrtc->framedone_completion,
281 timeout: msecs_to_jiffies(m: 500)))
282 dev_err(tidss->dev, "Timeout waiting for framedone on crtc %d",
283 tcrtc->hw_videoport);
284
285 dispc_vp_unprepare(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport);
286
287 spin_lock_irqsave(&ddev->event_lock, flags);
288 if (crtc->state->event) {
289 drm_crtc_send_vblank_event(crtc, e: crtc->state->event);
290 crtc->state->event = NULL;
291 }
292 spin_unlock_irqrestore(lock: &ddev->event_lock, flags);
293
294 drm_crtc_vblank_off(crtc);
295
296 dispc_vp_disable_clk(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport);
297
298 tidss_runtime_put(tidss);
299}
300
301static
302enum drm_mode_status tidss_crtc_mode_valid(struct drm_crtc *crtc,
303 const struct drm_display_mode *mode)
304{
305 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
306 struct drm_device *ddev = crtc->dev;
307 struct tidss_device *tidss = to_tidss(ddev);
308
309 return dispc_vp_mode_valid(dispc: tidss->dispc, hw_videoport: tcrtc->hw_videoport, mode);
310}
311
312static const struct drm_crtc_helper_funcs tidss_crtc_helper_funcs = {
313 .atomic_check = tidss_crtc_atomic_check,
314 .atomic_flush = tidss_crtc_atomic_flush,
315 .atomic_enable = tidss_crtc_atomic_enable,
316 .atomic_disable = tidss_crtc_atomic_disable,
317
318 .mode_valid = tidss_crtc_mode_valid,
319};
320
321/* drm_crtc_funcs */
322
323static int tidss_crtc_enable_vblank(struct drm_crtc *crtc)
324{
325 struct drm_device *ddev = crtc->dev;
326 struct tidss_device *tidss = to_tidss(ddev);
327
328 dev_dbg(ddev->dev, "%s\n", __func__);
329
330 tidss_runtime_get(tidss);
331
332 tidss_irq_enable_vblank(crtc);
333
334 return 0;
335}
336
337static void tidss_crtc_disable_vblank(struct drm_crtc *crtc)
338{
339 struct drm_device *ddev = crtc->dev;
340 struct tidss_device *tidss = to_tidss(ddev);
341
342 dev_dbg(ddev->dev, "%s\n", __func__);
343
344 tidss_irq_disable_vblank(crtc);
345
346 tidss_runtime_put(tidss);
347}
348
349static void tidss_crtc_reset(struct drm_crtc *crtc)
350{
351 struct tidss_crtc_state *tcrtc;
352
353 if (crtc->state)
354 __drm_atomic_helper_crtc_destroy_state(state: crtc->state);
355
356 kfree(objp: crtc->state);
357
358 tcrtc = kzalloc(size: sizeof(*tcrtc), GFP_KERNEL);
359 if (!tcrtc) {
360 crtc->state = NULL;
361 return;
362 }
363
364 __drm_atomic_helper_crtc_reset(crtc, state: &tcrtc->base);
365}
366
367static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
368{
369 struct tidss_crtc_state *state, *current_state;
370
371 if (WARN_ON(!crtc->state))
372 return NULL;
373
374 current_state = to_tidss_crtc_state(crtc->state);
375
376 state = kmalloc(size: sizeof(*state), GFP_KERNEL);
377 if (!state)
378 return NULL;
379
380 __drm_atomic_helper_crtc_duplicate_state(crtc, state: &state->base);
381
382 state->plane_pos_changed = false;
383
384 state->bus_format = current_state->bus_format;
385 state->bus_flags = current_state->bus_flags;
386
387 return &state->base;
388}
389
390static void tidss_crtc_destroy(struct drm_crtc *crtc)
391{
392 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
393
394 drm_crtc_cleanup(crtc);
395 kfree(objp: tcrtc);
396}
397
398static const struct drm_crtc_funcs tidss_crtc_funcs = {
399 .reset = tidss_crtc_reset,
400 .destroy = tidss_crtc_destroy,
401 .set_config = drm_atomic_helper_set_config,
402 .page_flip = drm_atomic_helper_page_flip,
403 .atomic_duplicate_state = tidss_crtc_duplicate_state,
404 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
405 .enable_vblank = tidss_crtc_enable_vblank,
406 .disable_vblank = tidss_crtc_disable_vblank,
407};
408
409struct tidss_crtc *tidss_crtc_create(struct tidss_device *tidss,
410 u32 hw_videoport,
411 struct drm_plane *primary)
412{
413 struct tidss_crtc *tcrtc;
414 struct drm_crtc *crtc;
415 unsigned int gamma_lut_size = 0;
416 bool has_ctm = tidss->feat->vp_feat.color.has_ctm;
417 int ret;
418
419 tcrtc = kzalloc(size: sizeof(*tcrtc), GFP_KERNEL);
420 if (!tcrtc)
421 return ERR_PTR(error: -ENOMEM);
422
423 tcrtc->hw_videoport = hw_videoport;
424 init_completion(x: &tcrtc->framedone_completion);
425
426 crtc = &tcrtc->crtc;
427
428 ret = drm_crtc_init_with_planes(dev: &tidss->ddev, crtc, primary,
429 NULL, funcs: &tidss_crtc_funcs, NULL);
430 if (ret < 0) {
431 kfree(objp: tcrtc);
432 return ERR_PTR(error: ret);
433 }
434
435 drm_crtc_helper_add(crtc, funcs: &tidss_crtc_helper_funcs);
436
437 /*
438 * The dispc gamma functions adapt to what ever size we ask
439 * from it no matter what HW supports. X-server assumes 256
440 * element gamma tables so lets use that.
441 */
442 if (tidss->feat->vp_feat.color.gamma_size)
443 gamma_lut_size = 256;
444
445 drm_crtc_enable_color_mgmt(crtc, degamma_lut_size: 0, has_ctm, gamma_lut_size);
446 if (gamma_lut_size)
447 drm_mode_crtc_set_gamma_size(crtc, gamma_size: gamma_lut_size);
448
449 return tcrtc;
450}
451

source code of linux/drivers/gpu/drm/tidss/tidss_crtc.c