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(tidss->dispc, tcrtc->hw_videoport);
 38	if (busy) {
 39		spin_unlock_irqrestore(&ddev->event_lock, flags);
 40		return;
 41	}
 42
 43	event = tcrtc->event;
 44	tcrtc->event = NULL;
 45
 46	if (!event) {
 47		spin_unlock_irqrestore(&ddev->event_lock, flags);
 48		return;
 49	}
 50
 51	drm_crtc_send_vblank_event(&tcrtc->crtc, event);
 52
 53	spin_unlock_irqrestore(&ddev->event_lock, flags);
 54
 55	drm_crtc_vblank_put(&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, 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(tidss->dispc, tplane->hw_plane_id,
153					    tcrtc->hw_videoport,
154					    pstate->crtc_x, pstate->crtc_y,
155					    layer);
156		}
157		dispc_ovr_enable_layer(tidss->dispc, tcrtc->hw_videoport, layer,
158				       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(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(tidss->dispc, tcrtc->hw_videoport, crtc->state, false);
194
195	/* Update plane positions if needed. */
196	tidss_crtc_position_planes(tidss, crtc, old_crtc_state, false);
197
198	WARN_ON(drm_crtc_vblank_get(crtc) != 0);
199
200	spin_lock_irqsave(&ddev->event_lock, flags);
201	dispc_vp_go(tidss->dispc, 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(&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(tidss->dispc, tcrtc->hw_videoport,
228				  mode->clock * 1000);
229	if (r != 0)
230		return;
231
232	r = dispc_vp_enable_clk(tidss->dispc, tcrtc->hw_videoport);
233	if (r != 0)
234		return;
235
236	dispc_vp_setup(tidss->dispc, tcrtc->hw_videoport, crtc->state, true);
237	tidss_crtc_position_planes(tidss, crtc, old_state, true);
238
239	/* Turn vertical blanking interrupt reporting on. */
240	drm_crtc_vblank_on(crtc);
241
242	dispc_vp_prepare(tidss->dispc, tcrtc->hw_videoport, crtc->state);
243
244	dispc_vp_enable(tidss->dispc, tcrtc->hw_videoport, crtc->state);
245
246	spin_lock_irqsave(&ddev->event_lock, flags);
247
248	if (crtc->state->event) {
249		drm_crtc_send_vblank_event(crtc, crtc->state->event);
250		crtc->state->event = NULL;
251	}
252
253	spin_unlock_irqrestore(&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(&tcrtc->framedone_completion);
267
268	dispc_vp_disable(tidss->dispc, tcrtc->hw_videoport);
269
270	if (!wait_for_completion_timeout(&tcrtc->framedone_completion,
271					 msecs_to_jiffies(500)))
272		dev_err(tidss->dev, "Timeout waiting for framedone on crtc %d",
273			tcrtc->hw_videoport);
274
275	dispc_vp_unprepare(tidss->dispc, tcrtc->hw_videoport);
276
277	spin_lock_irqsave(&ddev->event_lock, flags);
278	if (crtc->state->event) {
279		drm_crtc_send_vblank_event(crtc, crtc->state->event);
280		crtc->state->event = NULL;
281	}
282	spin_unlock_irqrestore(&ddev->event_lock, flags);
283
284	drm_crtc_vblank_off(crtc);
285
286	dispc_vp_disable_clk(tidss->dispc, tcrtc->hw_videoport);
287
288	tidss_runtime_put(tidss);
289}
290
291static
292enum drm_mode_status tidss_crtc_mode_valid(struct drm_crtc *crtc,
293					   const struct drm_display_mode *mode)
294{
295	struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
296	struct drm_device *ddev = crtc->dev;
297	struct tidss_device *tidss = to_tidss(ddev);
298
299	return dispc_vp_mode_valid(tidss->dispc, tcrtc->hw_videoport, mode);
300}
301
302static const struct drm_crtc_helper_funcs tidss_crtc_helper_funcs = {
303	.atomic_check = tidss_crtc_atomic_check,
304	.atomic_flush = tidss_crtc_atomic_flush,
305	.atomic_enable = tidss_crtc_atomic_enable,
306	.atomic_disable = tidss_crtc_atomic_disable,
307
308	.mode_valid = tidss_crtc_mode_valid,
309};
310
311/* drm_crtc_funcs */
312
313static int tidss_crtc_enable_vblank(struct drm_crtc *crtc)
314{
315	struct drm_device *ddev = crtc->dev;
316	struct tidss_device *tidss = to_tidss(ddev);
317
318	dev_dbg(ddev->dev, "%s\n", __func__);
319
320	tidss_runtime_get(tidss);
321
322	tidss_irq_enable_vblank(crtc);
323
324	return 0;
325}
326
327static void tidss_crtc_disable_vblank(struct drm_crtc *crtc)
328{
329	struct drm_device *ddev = crtc->dev;
330	struct tidss_device *tidss = to_tidss(ddev);
331
332	dev_dbg(ddev->dev, "%s\n", __func__);
333
334	tidss_irq_disable_vblank(crtc);
335
336	tidss_runtime_put(tidss);
337}
338
339static void tidss_crtc_reset(struct drm_crtc *crtc)
340{
341	struct tidss_crtc_state *tcrtc;
342
343	if (crtc->state)
344		__drm_atomic_helper_crtc_destroy_state(crtc->state);
345
346	kfree(crtc->state);
347
348	tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
349	if (!tcrtc) {
350		crtc->state = NULL;
351		return;
352	}
353
354	__drm_atomic_helper_crtc_reset(crtc, &tcrtc->base);
355}
356
357static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
358{
359	struct tidss_crtc_state *state, *current_state;
360
361	if (WARN_ON(!crtc->state))
362		return NULL;
363
364	current_state = to_tidss_crtc_state(crtc->state);
365
366	state = kmalloc(sizeof(*state), GFP_KERNEL);
367	if (!state)
368		return NULL;
369
370	__drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
371
372	state->plane_pos_changed = false;
373
374	state->bus_format = current_state->bus_format;
375	state->bus_flags = current_state->bus_flags;
376
377	return &state->base;
378}
379
380static void tidss_crtc_destroy(struct drm_crtc *crtc)
381{
382	struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
383
384	drm_crtc_cleanup(crtc);
385	kfree(tcrtc);
386}
387
388static const struct drm_crtc_funcs tidss_crtc_funcs = {
389	.reset = tidss_crtc_reset,
390	.destroy = tidss_crtc_destroy,
391	.set_config = drm_atomic_helper_set_config,
392	.page_flip = drm_atomic_helper_page_flip,
393	.atomic_duplicate_state = tidss_crtc_duplicate_state,
394	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
395	.enable_vblank = tidss_crtc_enable_vblank,
396	.disable_vblank = tidss_crtc_disable_vblank,
397};
398
399struct tidss_crtc *tidss_crtc_create(struct tidss_device *tidss,
400				     u32 hw_videoport,
401				     struct drm_plane *primary)
402{
403	struct tidss_crtc *tcrtc;
404	struct drm_crtc *crtc;
405	unsigned int gamma_lut_size = 0;
406	bool has_ctm = tidss->feat->vp_feat.color.has_ctm;
407	int ret;
408
409	tcrtc = kzalloc(sizeof(*tcrtc), GFP_KERNEL);
410	if (!tcrtc)
411		return ERR_PTR(-ENOMEM);
412
413	tcrtc->hw_videoport = hw_videoport;
414	init_completion(&tcrtc->framedone_completion);
415
416	crtc =  &tcrtc->crtc;
417
418	ret = drm_crtc_init_with_planes(&tidss->ddev, crtc, primary,
419					NULL, &tidss_crtc_funcs, NULL);
420	if (ret < 0) {
421		kfree(tcrtc);
422		return ERR_PTR(ret);
423	}
424
425	drm_crtc_helper_add(crtc, &tidss_crtc_helper_funcs);
426
427	/*
428	 * The dispc gamma functions adapt to what ever size we ask
429	 * from it no matter what HW supports. X-server assumes 256
430	 * element gamma tables so lets use that.
431	 */
432	if (tidss->feat->vp_feat.color.gamma_size)
433		gamma_lut_size = 256;
434
435	drm_crtc_enable_color_mgmt(crtc, 0, has_ctm, gamma_lut_size);
436	if (gamma_lut_size)
437		drm_mode_crtc_set_gamma_size(crtc, gamma_lut_size);
438
439	return tcrtc;
440}