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