1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) STMicroelectronics SA 2014
4  * Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
5  *          Fabien Dessenne <fabien.dessenne@st.com>
6  *          for STMicroelectronics.
7  */
8 
9 #include <linux/clk.h>
10 
11 #include <drm/drm_atomic.h>
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_device.h>
14 #include <drm/drm_plane_helper.h>
15 #include <drm/drm_print.h>
16 #include <drm/drm_probe_helper.h>
17 #include <drm/drm_vblank.h>
18 
19 #include "sti_compositor.h"
20 #include "sti_crtc.h"
21 #include "sti_drv.h"
22 #include "sti_vid.h"
23 #include "sti_vtg.h"
24 
sti_crtc_atomic_enable(struct drm_crtc * crtc,struct drm_crtc_state * old_state)25 static void sti_crtc_atomic_enable(struct drm_crtc *crtc,
26 				   struct drm_crtc_state *old_state)
27 {
28 	struct sti_mixer *mixer = to_sti_mixer(crtc);
29 
30 	DRM_DEBUG_DRIVER("\n");
31 
32 	mixer->status = STI_MIXER_READY;
33 
34 	drm_crtc_vblank_on(crtc);
35 }
36 
sti_crtc_atomic_disable(struct drm_crtc * crtc,struct drm_crtc_state * old_state)37 static void sti_crtc_atomic_disable(struct drm_crtc *crtc,
38 				    struct drm_crtc_state *old_state)
39 {
40 	struct sti_mixer *mixer = to_sti_mixer(crtc);
41 
42 	DRM_DEBUG_DRIVER("\n");
43 
44 	mixer->status = STI_MIXER_DISABLING;
45 
46 	drm_crtc_wait_one_vblank(crtc);
47 }
48 
49 static int
sti_crtc_mode_set(struct drm_crtc * crtc,struct drm_display_mode * mode)50 sti_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode)
51 {
52 	struct sti_mixer *mixer = to_sti_mixer(crtc);
53 	struct device *dev = mixer->dev;
54 	struct sti_compositor *compo = dev_get_drvdata(dev);
55 	struct clk *compo_clk, *pix_clk;
56 	int rate = mode->clock * 1000;
57 
58 	DRM_DEBUG_KMS("CRTC:%d (%s) mode: (%s)\n",
59 		      crtc->base.id, sti_mixer_to_str(mixer), mode->name);
60 
61 	DRM_DEBUG_KMS(DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
62 
63 	if (mixer->id == STI_MIXER_MAIN) {
64 		compo_clk = compo->clk_compo_main;
65 		pix_clk = compo->clk_pix_main;
66 	} else {
67 		compo_clk = compo->clk_compo_aux;
68 		pix_clk = compo->clk_pix_aux;
69 	}
70 
71 	/* Prepare and enable the compo IP clock */
72 	if (clk_prepare_enable(compo_clk)) {
73 		DRM_INFO("Failed to prepare/enable compositor clk\n");
74 		goto compo_error;
75 	}
76 
77 	/* Set rate and prepare/enable pixel clock */
78 	if (clk_set_rate(pix_clk, rate) < 0) {
79 		DRM_ERROR("Cannot set rate (%dHz) for pix clk\n", rate);
80 		goto pix_error;
81 	}
82 	if (clk_prepare_enable(pix_clk)) {
83 		DRM_ERROR("Failed to prepare/enable pix clk\n");
84 		goto pix_error;
85 	}
86 
87 	sti_vtg_set_config(compo->vtg[mixer->id], &crtc->mode);
88 
89 	if (sti_mixer_active_video_area(mixer, &crtc->mode)) {
90 		DRM_ERROR("Can't set active video area\n");
91 		goto mixer_error;
92 	}
93 
94 	return 0;
95 
96 mixer_error:
97 	clk_disable_unprepare(pix_clk);
98 pix_error:
99 	clk_disable_unprepare(compo_clk);
100 compo_error:
101 	return -EINVAL;
102 }
103 
sti_crtc_disable(struct drm_crtc * crtc)104 static void sti_crtc_disable(struct drm_crtc *crtc)
105 {
106 	struct sti_mixer *mixer = to_sti_mixer(crtc);
107 	struct device *dev = mixer->dev;
108 	struct sti_compositor *compo = dev_get_drvdata(dev);
109 
110 	DRM_DEBUG_KMS("CRTC:%d (%s)\n", crtc->base.id, sti_mixer_to_str(mixer));
111 
112 	/* Disable Background */
113 	sti_mixer_set_background_status(mixer, false);
114 
115 	drm_crtc_vblank_off(crtc);
116 
117 	/* Disable pixel clock and compo IP clocks */
118 	if (mixer->id == STI_MIXER_MAIN) {
119 		clk_disable_unprepare(compo->clk_pix_main);
120 		clk_disable_unprepare(compo->clk_compo_main);
121 	} else {
122 		clk_disable_unprepare(compo->clk_pix_aux);
123 		clk_disable_unprepare(compo->clk_compo_aux);
124 	}
125 
126 	mixer->status = STI_MIXER_DISABLED;
127 }
128 
129 static void
sti_crtc_mode_set_nofb(struct drm_crtc * crtc)130 sti_crtc_mode_set_nofb(struct drm_crtc *crtc)
131 {
132 	sti_crtc_mode_set(crtc, &crtc->state->adjusted_mode);
133 }
134 
sti_crtc_atomic_flush(struct drm_crtc * crtc,struct drm_crtc_state * old_crtc_state)135 static void sti_crtc_atomic_flush(struct drm_crtc *crtc,
136 				  struct drm_crtc_state *old_crtc_state)
137 {
138 	struct drm_device *drm_dev = crtc->dev;
139 	struct sti_mixer *mixer = to_sti_mixer(crtc);
140 	struct sti_compositor *compo = dev_get_drvdata(mixer->dev);
141 	struct drm_plane *p;
142 	struct drm_pending_vblank_event *event;
143 	unsigned long flags;
144 
145 	DRM_DEBUG_DRIVER("\n");
146 
147 	/* perform plane actions */
148 	list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
149 		struct sti_plane *plane = to_sti_plane(p);
150 
151 		switch (plane->status) {
152 		case STI_PLANE_UPDATED:
153 			/* ignore update for other CRTC */
154 			if (p->state->crtc != crtc)
155 				continue;
156 
157 			/* update planes tag as updated */
158 			DRM_DEBUG_DRIVER("update plane %s\n",
159 					 sti_plane_to_str(plane));
160 
161 			if (sti_mixer_set_plane_depth(mixer, plane)) {
162 				DRM_ERROR("Cannot set plane %s depth\n",
163 					  sti_plane_to_str(plane));
164 				break;
165 			}
166 
167 			if (sti_mixer_set_plane_status(mixer, plane, true)) {
168 				DRM_ERROR("Cannot enable plane %s at mixer\n",
169 					  sti_plane_to_str(plane));
170 				break;
171 			}
172 
173 			/* if plane is HQVDP_0 then commit the vid[0] */
174 			if (plane->desc == STI_HQVDP_0)
175 				sti_vid_commit(compo->vid[0], p->state);
176 
177 			plane->status = STI_PLANE_READY;
178 
179 			break;
180 		case STI_PLANE_DISABLING:
181 			/* disabling sequence for planes tag as disabling */
182 			DRM_DEBUG_DRIVER("disable plane %s from mixer\n",
183 					 sti_plane_to_str(plane));
184 
185 			if (sti_mixer_set_plane_status(mixer, plane, false)) {
186 				DRM_ERROR("Cannot disable plane %s at mixer\n",
187 					  sti_plane_to_str(plane));
188 				continue;
189 			}
190 
191 			if (plane->desc == STI_CURSOR)
192 				/* tag plane status for disabled */
193 				plane->status = STI_PLANE_DISABLED;
194 			else
195 				/* tag plane status for flushing */
196 				plane->status = STI_PLANE_FLUSHING;
197 
198 			/* if plane is HQVDP_0 then disable the vid[0] */
199 			if (plane->desc == STI_HQVDP_0)
200 				sti_vid_disable(compo->vid[0]);
201 
202 			break;
203 		default:
204 			/* Other status case are not handled */
205 			break;
206 		}
207 	}
208 
209 	event = crtc->state->event;
210 	if (event) {
211 		crtc->state->event = NULL;
212 
213 		spin_lock_irqsave(&crtc->dev->event_lock, flags);
214 		if (drm_crtc_vblank_get(crtc) == 0)
215 			drm_crtc_arm_vblank_event(crtc, event);
216 		else
217 			drm_crtc_send_vblank_event(crtc, event);
218 		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
219 	}
220 }
221 
222 static const struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
223 	.mode_set_nofb = sti_crtc_mode_set_nofb,
224 	.atomic_flush = sti_crtc_atomic_flush,
225 	.atomic_enable = sti_crtc_atomic_enable,
226 	.atomic_disable = sti_crtc_atomic_disable,
227 };
228 
sti_crtc_destroy(struct drm_crtc * crtc)229 static void sti_crtc_destroy(struct drm_crtc *crtc)
230 {
231 	DRM_DEBUG_KMS("\n");
232 	drm_crtc_cleanup(crtc);
233 }
234 
sti_crtc_set_property(struct drm_crtc * crtc,struct drm_property * property,uint64_t val)235 static int sti_crtc_set_property(struct drm_crtc *crtc,
236 				 struct drm_property *property,
237 				 uint64_t val)
238 {
239 	DRM_DEBUG_KMS("\n");
240 	return 0;
241 }
242 
sti_crtc_vblank_cb(struct notifier_block * nb,unsigned long event,void * data)243 int sti_crtc_vblank_cb(struct notifier_block *nb,
244 		       unsigned long event, void *data)
245 {
246 	struct sti_compositor *compo;
247 	struct drm_crtc *crtc = data;
248 	struct sti_mixer *mixer;
249 	unsigned int pipe;
250 
251 	pipe = drm_crtc_index(crtc);
252 	compo = container_of(nb, struct sti_compositor, vtg_vblank_nb[pipe]);
253 	mixer = compo->mixer[pipe];
254 
255 	if ((event != VTG_TOP_FIELD_EVENT) &&
256 	    (event != VTG_BOTTOM_FIELD_EVENT)) {
257 		DRM_ERROR("unknown event: %lu\n", event);
258 		return -EINVAL;
259 	}
260 
261 	drm_crtc_handle_vblank(crtc);
262 
263 	if (mixer->status == STI_MIXER_DISABLING) {
264 		struct drm_plane *p;
265 
266 		/* Disable mixer only if all overlay planes (GDP and VDP)
267 		 * are disabled */
268 		list_for_each_entry(p, &crtc->dev->mode_config.plane_list,
269 				    head) {
270 			struct sti_plane *plane = to_sti_plane(p);
271 
272 			if ((plane->desc & STI_PLANE_TYPE_MASK) <= STI_VDP)
273 				if (plane->status != STI_PLANE_DISABLED)
274 					return 0;
275 		}
276 		sti_crtc_disable(crtc);
277 	}
278 
279 	return 0;
280 }
281 
sti_crtc_enable_vblank(struct drm_device * dev,unsigned int pipe)282 int sti_crtc_enable_vblank(struct drm_device *dev, unsigned int pipe)
283 {
284 	struct sti_private *dev_priv = dev->dev_private;
285 	struct sti_compositor *compo = dev_priv->compo;
286 	struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb[pipe];
287 	struct drm_crtc *crtc = &compo->mixer[pipe]->drm_crtc;
288 	struct sti_vtg *vtg = compo->vtg[pipe];
289 
290 	DRM_DEBUG_DRIVER("\n");
291 
292 	if (sti_vtg_register_client(vtg, vtg_vblank_nb, crtc)) {
293 		DRM_ERROR("Cannot register VTG notifier\n");
294 		return -EINVAL;
295 	}
296 
297 	return 0;
298 }
299 
sti_crtc_disable_vblank(struct drm_device * drm_dev,unsigned int pipe)300 void sti_crtc_disable_vblank(struct drm_device *drm_dev, unsigned int pipe)
301 {
302 	struct sti_private *priv = drm_dev->dev_private;
303 	struct sti_compositor *compo = priv->compo;
304 	struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb[pipe];
305 	struct sti_vtg *vtg = compo->vtg[pipe];
306 
307 	DRM_DEBUG_DRIVER("\n");
308 
309 	if (sti_vtg_unregister_client(vtg, vtg_vblank_nb))
310 		DRM_DEBUG_DRIVER("Warning: cannot unregister VTG notifier\n");
311 }
312 
sti_crtc_late_register(struct drm_crtc * crtc)313 static int sti_crtc_late_register(struct drm_crtc *crtc)
314 {
315 	struct sti_mixer *mixer = to_sti_mixer(crtc);
316 	struct sti_compositor *compo = dev_get_drvdata(mixer->dev);
317 
318 	if (drm_crtc_index(crtc) == 0)
319 		return sti_compositor_debugfs_init(compo, crtc->dev->primary);
320 
321 	return 0;
322 }
323 
324 static const struct drm_crtc_funcs sti_crtc_funcs = {
325 	.set_config = drm_atomic_helper_set_config,
326 	.page_flip = drm_atomic_helper_page_flip,
327 	.destroy = sti_crtc_destroy,
328 	.set_property = sti_crtc_set_property,
329 	.reset = drm_atomic_helper_crtc_reset,
330 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
331 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
332 	.late_register = sti_crtc_late_register,
333 };
334 
sti_crtc_is_main(struct drm_crtc * crtc)335 bool sti_crtc_is_main(struct drm_crtc *crtc)
336 {
337 	struct sti_mixer *mixer = to_sti_mixer(crtc);
338 
339 	if (mixer->id == STI_MIXER_MAIN)
340 		return true;
341 
342 	return false;
343 }
344 
sti_crtc_init(struct drm_device * drm_dev,struct sti_mixer * mixer,struct drm_plane * primary,struct drm_plane * cursor)345 int sti_crtc_init(struct drm_device *drm_dev, struct sti_mixer *mixer,
346 		  struct drm_plane *primary, struct drm_plane *cursor)
347 {
348 	struct drm_crtc *crtc = &mixer->drm_crtc;
349 	int res;
350 
351 	res = drm_crtc_init_with_planes(drm_dev, crtc, primary, cursor,
352 					&sti_crtc_funcs, NULL);
353 	if (res) {
354 		DRM_ERROR("Can't initialize CRTC\n");
355 		return -EINVAL;
356 	}
357 
358 	drm_crtc_helper_add(crtc, &sti_crtc_helper_funcs);
359 
360 	DRM_DEBUG_DRIVER("drm CRTC:%d mapped to %s\n",
361 			 crtc->base.id, sti_mixer_to_str(mixer));
362 
363 	return 0;
364 }
365