1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
4 * Author: Rob Clark <rob@ti.com>
7 #include <linux/math64.h>
9 #include <drm/drm_atomic.h>
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_crtc.h>
12 #include <drm/drm_mode.h>
13 #include <drm/drm_plane_helper.h>
14 #include <drm/drm_vblank.h>
18 #define to_omap_crtc_state(x) container_of(x, struct omap_crtc_state, base)
20 struct omap_crtc_state {
22 struct drm_crtc_state base;
23 /* Shadow values for legacy userspace support. */
24 unsigned int rotation;
26 bool manually_updated;
29 #define to_omap_crtc(x) container_of(x, struct omap_crtc, base)
35 struct omap_drm_pipeline *pipe;
36 enum omap_channel channel;
40 bool ignore_digit_sync_lost;
44 wait_queue_head_t pending_wait;
45 struct drm_pending_vblank_event *event;
46 struct delayed_work update_work;
48 void (*framedone_handler)(void *);
49 void *framedone_handler_data;
52 /* -----------------------------------------------------------------------------
56 struct videomode *omap_crtc_timings(struct drm_crtc *crtc)
58 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
59 return &omap_crtc->vm;
62 enum omap_channel omap_crtc_channel(struct drm_crtc *crtc)
64 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
65 return omap_crtc->channel;
68 static bool omap_crtc_is_pending(struct drm_crtc *crtc)
70 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
74 spin_lock_irqsave(&crtc->dev->event_lock, flags);
75 pending = omap_crtc->pending;
76 spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
81 int omap_crtc_wait_pending(struct drm_crtc *crtc)
83 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
86 * Timeout is set to a "sufficiently" high value, which should cover
87 * a single frame refresh even on slower displays.
89 return wait_event_timeout(omap_crtc->pending_wait,
90 !omap_crtc_is_pending(crtc),
91 msecs_to_jiffies(250));
94 /* -----------------------------------------------------------------------------
95 * DSS Manager Functions
99 * Manager-ops, callbacks from output when they need to configure
100 * the upstream part of the video pipe.
103 static void omap_crtc_dss_start_update(struct omap_drm_private *priv,
104 enum omap_channel channel)
106 priv->dispc_ops->mgr_enable(priv->dispc, channel, true);
109 /* Called only from the encoder enable/disable and suspend/resume handlers. */
110 static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
112 struct omap_crtc_state *omap_state = to_omap_crtc_state(crtc->state);
113 struct drm_device *dev = crtc->dev;
114 struct omap_drm_private *priv = dev->dev_private;
115 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
116 enum omap_channel channel = omap_crtc->channel;
117 struct omap_irq_wait *wait;
118 u32 framedone_irq, vsync_irq;
121 if (WARN_ON(omap_crtc->enabled == enable))
124 if (omap_state->manually_updated) {
125 omap_irq_enable_framedone(crtc, enable);
126 omap_crtc->enabled = enable;
130 if (omap_crtc->pipe->output->type == OMAP_DISPLAY_TYPE_HDMI) {
131 priv->dispc_ops->mgr_enable(priv->dispc, channel, enable);
132 omap_crtc->enabled = enable;
136 if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
138 * Digit output produces some sync lost interrupts during the
139 * first frame when enabling, so we need to ignore those.
141 omap_crtc->ignore_digit_sync_lost = true;
144 framedone_irq = priv->dispc_ops->mgr_get_framedone_irq(priv->dispc,
146 vsync_irq = priv->dispc_ops->mgr_get_vsync_irq(priv->dispc, channel);
149 wait = omap_irq_wait_init(dev, vsync_irq, 1);
152 * When we disable the digit output, we need to wait for
153 * FRAMEDONE to know that DISPC has finished with the output.
155 * OMAP2/3 does not have FRAMEDONE irq for digit output, and in
156 * that case we need to use vsync interrupt, and wait for both
157 * even and odd frames.
161 wait = omap_irq_wait_init(dev, framedone_irq, 1);
163 wait = omap_irq_wait_init(dev, vsync_irq, 2);
166 priv->dispc_ops->mgr_enable(priv->dispc, channel, enable);
167 omap_crtc->enabled = enable;
169 ret = omap_irq_wait(dev, wait, msecs_to_jiffies(100));
171 dev_err(dev->dev, "%s: timeout waiting for %s\n",
172 omap_crtc->name, enable ? "enable" : "disable");
175 if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
176 omap_crtc->ignore_digit_sync_lost = false;
177 /* make sure the irq handler sees the value above */
183 static int omap_crtc_dss_enable(struct omap_drm_private *priv,
184 enum omap_channel channel)
186 struct drm_crtc *crtc = priv->channels[channel]->crtc;
187 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
189 priv->dispc_ops->mgr_set_timings(priv->dispc, omap_crtc->channel,
191 omap_crtc_set_enabled(&omap_crtc->base, true);
196 static void omap_crtc_dss_disable(struct omap_drm_private *priv,
197 enum omap_channel channel)
199 struct drm_crtc *crtc = priv->channels[channel]->crtc;
200 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
202 omap_crtc_set_enabled(&omap_crtc->base, false);
205 static void omap_crtc_dss_set_timings(struct omap_drm_private *priv,
206 enum omap_channel channel,
207 const struct videomode *vm)
209 struct drm_crtc *crtc = priv->channels[channel]->crtc;
210 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
212 DBG("%s", omap_crtc->name);
216 static void omap_crtc_dss_set_lcd_config(struct omap_drm_private *priv,
217 enum omap_channel channel,
218 const struct dss_lcd_mgr_config *config)
220 struct drm_crtc *crtc = priv->channels[channel]->crtc;
221 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
223 DBG("%s", omap_crtc->name);
224 priv->dispc_ops->mgr_set_lcd_config(priv->dispc, omap_crtc->channel,
228 static int omap_crtc_dss_register_framedone(
229 struct omap_drm_private *priv, enum omap_channel channel,
230 void (*handler)(void *), void *data)
232 struct drm_crtc *crtc = priv->channels[channel]->crtc;
233 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
234 struct drm_device *dev = omap_crtc->base.dev;
236 if (omap_crtc->framedone_handler)
239 dev_dbg(dev->dev, "register framedone %s", omap_crtc->name);
241 omap_crtc->framedone_handler = handler;
242 omap_crtc->framedone_handler_data = data;
247 static void omap_crtc_dss_unregister_framedone(
248 struct omap_drm_private *priv, enum omap_channel channel,
249 void (*handler)(void *), void *data)
251 struct drm_crtc *crtc = priv->channels[channel]->crtc;
252 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
253 struct drm_device *dev = omap_crtc->base.dev;
255 dev_dbg(dev->dev, "unregister framedone %s", omap_crtc->name);
257 WARN_ON(omap_crtc->framedone_handler != handler);
258 WARN_ON(omap_crtc->framedone_handler_data != data);
260 omap_crtc->framedone_handler = NULL;
261 omap_crtc->framedone_handler_data = NULL;
264 static const struct dss_mgr_ops mgr_ops = {
265 .start_update = omap_crtc_dss_start_update,
266 .enable = omap_crtc_dss_enable,
267 .disable = omap_crtc_dss_disable,
268 .set_timings = omap_crtc_dss_set_timings,
269 .set_lcd_config = omap_crtc_dss_set_lcd_config,
270 .register_framedone_handler = omap_crtc_dss_register_framedone,
271 .unregister_framedone_handler = omap_crtc_dss_unregister_framedone,
274 /* -----------------------------------------------------------------------------
275 * Setup, Flush and Page Flip
278 void omap_crtc_error_irq(struct drm_crtc *crtc, u32 irqstatus)
280 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
282 if (omap_crtc->ignore_digit_sync_lost) {
283 irqstatus &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
288 DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
291 void omap_crtc_vblank_irq(struct drm_crtc *crtc)
293 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
294 struct drm_device *dev = omap_crtc->base.dev;
295 struct omap_drm_private *priv = dev->dev_private;
298 spin_lock(&crtc->dev->event_lock);
300 * If the dispc is busy we're racing the flush operation. Try again on
301 * the next vblank interrupt.
303 if (priv->dispc_ops->mgr_go_busy(priv->dispc, omap_crtc->channel)) {
304 spin_unlock(&crtc->dev->event_lock);
308 /* Send the vblank event if one has been requested. */
309 if (omap_crtc->event) {
310 drm_crtc_send_vblank_event(crtc, omap_crtc->event);
311 omap_crtc->event = NULL;
314 pending = omap_crtc->pending;
315 omap_crtc->pending = false;
316 spin_unlock(&crtc->dev->event_lock);
319 drm_crtc_vblank_put(crtc);
321 /* Wake up omap_atomic_complete. */
322 wake_up(&omap_crtc->pending_wait);
324 DBG("%s: apply done", omap_crtc->name);
327 void omap_crtc_framedone_irq(struct drm_crtc *crtc, uint32_t irqstatus)
329 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
331 if (!omap_crtc->framedone_handler)
334 omap_crtc->framedone_handler(omap_crtc->framedone_handler_data);
336 spin_lock(&crtc->dev->event_lock);
337 /* Send the vblank event if one has been requested. */
338 if (omap_crtc->event) {
339 drm_crtc_send_vblank_event(crtc, omap_crtc->event);
340 omap_crtc->event = NULL;
342 omap_crtc->pending = false;
343 spin_unlock(&crtc->dev->event_lock);
345 /* Wake up omap_atomic_complete. */
346 wake_up(&omap_crtc->pending_wait);
349 void omap_crtc_flush(struct drm_crtc *crtc)
351 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
352 struct omap_crtc_state *omap_state = to_omap_crtc_state(crtc->state);
354 if (!omap_state->manually_updated)
357 if (!delayed_work_pending(&omap_crtc->update_work))
358 schedule_delayed_work(&omap_crtc->update_work, 0);
361 static void omap_crtc_manual_display_update(struct work_struct *data)
363 struct omap_crtc *omap_crtc =
364 container_of(data, struct omap_crtc, update_work.work);
365 struct drm_display_mode *mode = &omap_crtc->pipe->crtc->mode;
366 struct omap_dss_device *dssdev = omap_crtc->pipe->output->next;
367 struct drm_device *dev = omap_crtc->base.dev;
368 const struct omap_dss_driver *dssdrv;
372 dev_err_once(dev->dev, "missing display dssdev!");
376 dssdrv = dssdev->driver;
377 if (!dssdrv || !dssdrv->update) {
378 dev_err_once(dev->dev, "missing or incorrect dssdrv!");
383 dssdrv->sync(dssdev);
385 ret = dssdrv->update(dssdev, 0, 0, mode->hdisplay, mode->vdisplay);
387 spin_lock_irq(&dev->event_lock);
388 omap_crtc->pending = false;
389 spin_unlock_irq(&dev->event_lock);
390 wake_up(&omap_crtc->pending_wait);
394 static void omap_crtc_write_crtc_properties(struct drm_crtc *crtc)
396 struct omap_drm_private *priv = crtc->dev->dev_private;
397 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
398 struct omap_overlay_manager_info info;
400 memset(&info, 0, sizeof(info));
402 info.default_color = 0x000000;
403 info.trans_enabled = false;
404 info.partial_alpha_enabled = false;
405 info.cpr_enable = false;
407 priv->dispc_ops->mgr_setup(priv->dispc, omap_crtc->channel, &info);
410 /* -----------------------------------------------------------------------------
414 static void omap_crtc_destroy(struct drm_crtc *crtc)
416 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
418 DBG("%s", omap_crtc->name);
420 drm_crtc_cleanup(crtc);
425 static void omap_crtc_arm_event(struct drm_crtc *crtc)
427 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
429 WARN_ON(omap_crtc->pending);
430 omap_crtc->pending = true;
432 if (crtc->state->event) {
433 omap_crtc->event = crtc->state->event;
434 crtc->state->event = NULL;
438 static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
439 struct drm_crtc_state *old_state)
441 struct omap_drm_private *priv = crtc->dev->dev_private;
442 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
443 struct omap_crtc_state *omap_state = to_omap_crtc_state(crtc->state);
446 DBG("%s", omap_crtc->name);
448 priv->dispc_ops->runtime_get(priv->dispc);
450 /* manual updated display will not trigger vsync irq */
451 if (omap_state->manually_updated)
454 drm_crtc_vblank_on(crtc);
456 ret = drm_crtc_vblank_get(crtc);
459 spin_lock_irq(&crtc->dev->event_lock);
460 omap_crtc_arm_event(crtc);
461 spin_unlock_irq(&crtc->dev->event_lock);
464 static void omap_crtc_atomic_disable(struct drm_crtc *crtc,
465 struct drm_crtc_state *old_state)
467 struct omap_drm_private *priv = crtc->dev->dev_private;
468 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
469 struct drm_device *dev = crtc->dev;
471 DBG("%s", omap_crtc->name);
473 spin_lock_irq(&crtc->dev->event_lock);
474 if (crtc->state->event) {
475 drm_crtc_send_vblank_event(crtc, crtc->state->event);
476 crtc->state->event = NULL;
478 spin_unlock_irq(&crtc->dev->event_lock);
480 cancel_delayed_work(&omap_crtc->update_work);
482 if (!omap_crtc_wait_pending(crtc))
483 dev_warn(dev->dev, "manual display update did not finish!");
485 drm_crtc_vblank_off(crtc);
487 priv->dispc_ops->runtime_put(priv->dispc);
490 static enum drm_mode_status omap_crtc_mode_valid(struct drm_crtc *crtc,
491 const struct drm_display_mode *mode)
493 struct omap_drm_private *priv = crtc->dev->dev_private;
494 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
495 struct videomode vm = {0};
498 drm_display_mode_to_videomode(mode, &vm);
501 * DSI might not call this, since the supplied mode is not a
502 * valid DISPC mode. DSI will calculate and configure the
503 * proper DISPC mode later.
505 if (omap_crtc->pipe->output->next == NULL ||
506 omap_crtc->pipe->output->next->type != OMAP_DISPLAY_TYPE_DSI) {
507 r = priv->dispc_ops->mgr_check_timings(priv->dispc,
514 /* Check for bandwidth limit */
515 if (priv->max_bandwidth) {
517 * Estimation for the bandwidth need of a given mode with one
519 * bandwidth = resolution * 32bpp * (pclk / (vtotal * htotal))
522 * The interlaced mode is taken into account by using the
523 * pixelclock in the calculation.
525 * The equation is rearranged for 64bit arithmetic.
527 uint64_t bandwidth = mode->clock * 1000;
528 unsigned int bpp = 4;
530 bandwidth = bandwidth * mode->hdisplay * mode->vdisplay * bpp;
531 bandwidth = div_u64(bandwidth, mode->htotal * mode->vtotal);
534 * Reject modes which would need more bandwidth if used with one
535 * full resolution plane (most common use case).
537 if (priv->max_bandwidth < bandwidth)
544 static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
546 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
547 struct drm_display_mode *mode = &crtc->state->adjusted_mode;
549 DBG("%s: set mode: " DRM_MODE_FMT,
550 omap_crtc->name, DRM_MODE_ARG(mode));
552 drm_display_mode_to_videomode(mode, &omap_crtc->vm);
555 static bool omap_crtc_is_manually_updated(struct drm_crtc *crtc)
557 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
558 struct omap_dss_device *display = omap_crtc->pipe->output->next;
563 if (display->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE) {
564 DBG("detected manually updated display!");
571 static int omap_crtc_atomic_check(struct drm_crtc *crtc,
572 struct drm_crtc_state *state)
574 struct drm_plane_state *pri_state;
576 if (state->color_mgmt_changed && state->gamma_lut) {
577 unsigned int length = state->gamma_lut->length /
578 sizeof(struct drm_color_lut);
584 pri_state = drm_atomic_get_new_plane_state(state->state, crtc->primary);
586 struct omap_crtc_state *omap_crtc_state =
587 to_omap_crtc_state(state);
589 /* Mirror new values for zpos and rotation in omap_crtc_state */
590 omap_crtc_state->zpos = pri_state->zpos;
591 omap_crtc_state->rotation = pri_state->rotation;
593 /* Check if this CRTC is for a manually updated display */
594 omap_crtc_state->manually_updated = omap_crtc_is_manually_updated(crtc);
600 static void omap_crtc_atomic_begin(struct drm_crtc *crtc,
601 struct drm_crtc_state *old_crtc_state)
605 static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
606 struct drm_crtc_state *old_crtc_state)
608 struct omap_drm_private *priv = crtc->dev->dev_private;
609 struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
610 struct omap_crtc_state *omap_crtc_state = to_omap_crtc_state(crtc->state);
613 if (crtc->state->color_mgmt_changed) {
614 struct drm_color_lut *lut = NULL;
615 unsigned int length = 0;
617 if (crtc->state->gamma_lut) {
618 lut = (struct drm_color_lut *)
619 crtc->state->gamma_lut->data;
620 length = crtc->state->gamma_lut->length /
623 priv->dispc_ops->mgr_set_gamma(priv->dispc, omap_crtc->channel,
627 omap_crtc_write_crtc_properties(crtc);
629 /* Only flush the CRTC if it is currently enabled. */
630 if (!omap_crtc->enabled)
633 DBG("%s: GO", omap_crtc->name);
635 if (omap_crtc_state->manually_updated) {
636 /* send new image for page flips and modeset changes */
637 spin_lock_irq(&crtc->dev->event_lock);
638 omap_crtc_flush(crtc);
639 omap_crtc_arm_event(crtc);
640 spin_unlock_irq(&crtc->dev->event_lock);
644 ret = drm_crtc_vblank_get(crtc);
647 spin_lock_irq(&crtc->dev->event_lock);
648 priv->dispc_ops->mgr_go(priv->dispc, omap_crtc->channel);
649 omap_crtc_arm_event(crtc);
650 spin_unlock_irq(&crtc->dev->event_lock);
653 static int omap_crtc_atomic_set_property(struct drm_crtc *crtc,
654 struct drm_crtc_state *state,
655 struct drm_property *property,
658 struct omap_drm_private *priv = crtc->dev->dev_private;
659 struct drm_plane_state *plane_state;
662 * Delegate property set to the primary plane. Get the plane state and
663 * set the property directly, the shadow copy will be assigned in the
664 * omap_crtc_atomic_check callback. This way updates to plane state will
665 * always be mirrored in the crtc state correctly.
667 plane_state = drm_atomic_get_plane_state(state->state, crtc->primary);
668 if (IS_ERR(plane_state))
669 return PTR_ERR(plane_state);
671 if (property == crtc->primary->rotation_property)
672 plane_state->rotation = val;
673 else if (property == priv->zorder_prop)
674 plane_state->zpos = val;
681 static int omap_crtc_atomic_get_property(struct drm_crtc *crtc,
682 const struct drm_crtc_state *state,
683 struct drm_property *property,
686 struct omap_drm_private *priv = crtc->dev->dev_private;
687 struct omap_crtc_state *omap_state = to_omap_crtc_state(state);
689 if (property == crtc->primary->rotation_property)
690 *val = omap_state->rotation;
691 else if (property == priv->zorder_prop)
692 *val = omap_state->zpos;
699 static void omap_crtc_reset(struct drm_crtc *crtc)
701 struct omap_crtc_state *state;
704 __drm_atomic_helper_crtc_destroy_state(crtc->state);
708 state = kzalloc(sizeof(*state), GFP_KERNEL);
710 __drm_atomic_helper_crtc_reset(crtc, &state->base);
713 static struct drm_crtc_state *
714 omap_crtc_duplicate_state(struct drm_crtc *crtc)
716 struct omap_crtc_state *state, *current_state;
718 if (WARN_ON(!crtc->state))
721 current_state = to_omap_crtc_state(crtc->state);
723 state = kmalloc(sizeof(*state), GFP_KERNEL);
727 __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
729 state->zpos = current_state->zpos;
730 state->rotation = current_state->rotation;
731 state->manually_updated = current_state->manually_updated;
736 static const struct drm_crtc_funcs omap_crtc_funcs = {
737 .reset = omap_crtc_reset,
738 .set_config = drm_atomic_helper_set_config,
739 .destroy = omap_crtc_destroy,
740 .page_flip = drm_atomic_helper_page_flip,
741 .gamma_set = drm_atomic_helper_legacy_gamma_set,
742 .atomic_duplicate_state = omap_crtc_duplicate_state,
743 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
744 .atomic_set_property = omap_crtc_atomic_set_property,
745 .atomic_get_property = omap_crtc_atomic_get_property,
746 .enable_vblank = omap_irq_enable_vblank,
747 .disable_vblank = omap_irq_disable_vblank,
750 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
751 .mode_set_nofb = omap_crtc_mode_set_nofb,
752 .atomic_check = omap_crtc_atomic_check,
753 .atomic_begin = omap_crtc_atomic_begin,
754 .atomic_flush = omap_crtc_atomic_flush,
755 .atomic_enable = omap_crtc_atomic_enable,
756 .atomic_disable = omap_crtc_atomic_disable,
757 .mode_valid = omap_crtc_mode_valid,
760 /* -----------------------------------------------------------------------------
764 static const char *channel_names[] = {
765 [OMAP_DSS_CHANNEL_LCD] = "lcd",
766 [OMAP_DSS_CHANNEL_DIGIT] = "tv",
767 [OMAP_DSS_CHANNEL_LCD2] = "lcd2",
768 [OMAP_DSS_CHANNEL_LCD3] = "lcd3",
771 void omap_crtc_pre_init(struct omap_drm_private *priv)
773 dss_install_mgr_ops(priv->dss, &mgr_ops, priv);
776 void omap_crtc_pre_uninit(struct omap_drm_private *priv)
778 dss_uninstall_mgr_ops(priv->dss);
781 /* initialize crtc */
782 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
783 struct omap_drm_pipeline *pipe,
784 struct drm_plane *plane)
786 struct omap_drm_private *priv = dev->dev_private;
787 struct drm_crtc *crtc = NULL;
788 struct omap_crtc *omap_crtc;
789 enum omap_channel channel;
792 channel = pipe->output->dispc_channel;
794 DBG("%s", channel_names[channel]);
796 omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
798 return ERR_PTR(-ENOMEM);
800 crtc = &omap_crtc->base;
802 init_waitqueue_head(&omap_crtc->pending_wait);
804 omap_crtc->pipe = pipe;
805 omap_crtc->channel = channel;
806 omap_crtc->name = channel_names[channel];
809 * We want to refresh manually updated displays from dirty callback,
810 * which is called quite often (e.g. for each drawn line). This will
811 * be used to do the display update asynchronously to avoid blocking
812 * the rendering process and merges multiple dirty calls into one
813 * update if they arrive very fast. We also call this function for
814 * atomic display updates (e.g. for page flips), which means we do
815 * not need extra locking. Atomic updates should be synchronous, but
816 * need to wait for the framedone interrupt anyways.
818 INIT_DELAYED_WORK(&omap_crtc->update_work,
819 omap_crtc_manual_display_update);
821 ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
822 &omap_crtc_funcs, NULL);
824 dev_err(dev->dev, "%s(): could not init crtc for: %s\n",
825 __func__, pipe->output->name);
830 drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
832 /* The dispc API adapts to what ever size, but the HW supports
833 * 256 element gamma table for LCDs and 1024 element table for
834 * OMAP_DSS_CHANNEL_DIGIT. X server assumes 256 element gamma
835 * tables so lets use that. Size of HW gamma table can be
836 * extracted with dispc_mgr_gamma_size(). If it returns 0
837 * gamma table is not supported.
839 if (priv->dispc_ops->mgr_gamma_size(priv->dispc, channel)) {
840 unsigned int gamma_lut_size = 256;
842 drm_crtc_enable_color_mgmt(crtc, 0, false, gamma_lut_size);
843 drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
846 omap_plane_install_properties(crtc->primary, &crtc->base);