1/*
2 * Copyright (C) STMicroelectronics SA 2014
3 * Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
4 *          Fabien Dessenne <fabien.dessenne@st.com>
5 *          for STMicroelectronics.
6 * License terms:  GNU General Public License (GPL), version 2
7 */
8
9#include <linux/clk.h>
10
11#include <drm/drmP.h>
12#include <drm/drm_atomic.h>
13#include <drm/drm_atomic_helper.h>
14#include <drm/drm_crtc_helper.h>
15#include <drm/drm_plane_helper.h>
16
17#include "sti_compositor.h"
18#include "sti_drm_drv.h"
19#include "sti_drm_crtc.h"
20#include "sti_vtg.h"
21
22static void sti_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
23{
24	DRM_DEBUG_KMS("\n");
25}
26
27static void sti_drm_crtc_prepare(struct drm_crtc *crtc)
28{
29	struct sti_mixer *mixer = to_sti_mixer(crtc);
30	struct device *dev = mixer->dev;
31	struct sti_compositor *compo = dev_get_drvdata(dev);
32
33	mixer->enabled = true;
34
35	/* Prepare and enable the compo IP clock */
36	if (mixer->id == STI_MIXER_MAIN) {
37		if (clk_prepare_enable(compo->clk_compo_main))
38			DRM_INFO("Failed to prepare/enable compo_main clk\n");
39	} else {
40		if (clk_prepare_enable(compo->clk_compo_aux))
41			DRM_INFO("Failed to prepare/enable compo_aux clk\n");
42	}
43
44	sti_mixer_clear_all_layers(mixer);
45}
46
47static void sti_drm_crtc_commit(struct drm_crtc *crtc)
48{
49	struct sti_mixer *mixer = to_sti_mixer(crtc);
50	struct device *dev = mixer->dev;
51	struct sti_compositor *compo = dev_get_drvdata(dev);
52	struct sti_layer *layer;
53
54	if ((!mixer || !compo)) {
55		DRM_ERROR("Can not find mixer or compositor)\n");
56		return;
57	}
58
59	/* get GDP which is reserved to the CRTC FB */
60	layer = to_sti_layer(crtc->primary);
61	if (layer)
62		sti_layer_commit(layer);
63	else
64		DRM_ERROR("Can not find CRTC dedicated plane (GDP0)\n");
65
66	/* Enable layer on mixer */
67	if (sti_mixer_set_layer_status(mixer, layer, true))
68		DRM_ERROR("Can not enable layer at mixer\n");
69
70	drm_crtc_vblank_on(crtc);
71}
72
73static bool sti_drm_crtc_mode_fixup(struct drm_crtc *crtc,
74				    const struct drm_display_mode *mode,
75				    struct drm_display_mode *adjusted_mode)
76{
77	/* accept the provided drm_display_mode, do not fix it up */
78	return true;
79}
80
81static int
82sti_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode)
83{
84	struct sti_mixer *mixer = to_sti_mixer(crtc);
85	struct device *dev = mixer->dev;
86	struct sti_compositor *compo = dev_get_drvdata(dev);
87	struct clk *clk;
88	int rate = mode->clock * 1000;
89	int res;
90
91	DRM_DEBUG_KMS("CRTC:%d (%s) mode:%d (%s)\n",
92		      crtc->base.id, sti_mixer_to_str(mixer),
93		      mode->base.id, mode->name);
94
95	DRM_DEBUG_KMS("%d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
96		      mode->vrefresh, mode->clock,
97		      mode->hdisplay,
98		      mode->hsync_start, mode->hsync_end,
99		      mode->htotal,
100		      mode->vdisplay,
101		      mode->vsync_start, mode->vsync_end,
102		      mode->vtotal, mode->type, mode->flags);
103
104	/* Set rate and prepare/enable pixel clock */
105	if (mixer->id == STI_MIXER_MAIN)
106		clk = compo->clk_pix_main;
107	else
108		clk = compo->clk_pix_aux;
109
110	res = clk_set_rate(clk, rate);
111	if (res < 0) {
112		DRM_ERROR("Cannot set rate (%dHz) for pix clk\n", rate);
113		return -EINVAL;
114	}
115	if (clk_prepare_enable(clk)) {
116		DRM_ERROR("Failed to prepare/enable pix clk\n");
117		return -EINVAL;
118	}
119
120	sti_vtg_set_config(mixer->id == STI_MIXER_MAIN ?
121			compo->vtg_main : compo->vtg_aux, &crtc->mode);
122
123	res = sti_mixer_active_video_area(mixer, &crtc->mode);
124	if (res) {
125		DRM_ERROR("Can not set active video area\n");
126		return -EINVAL;
127	}
128
129	return res;
130}
131
132static void sti_drm_crtc_disable(struct drm_crtc *crtc)
133{
134	struct sti_mixer *mixer = to_sti_mixer(crtc);
135	struct device *dev = mixer->dev;
136	struct sti_compositor *compo = dev_get_drvdata(dev);
137
138	if (!mixer->enabled)
139		return;
140
141	DRM_DEBUG_KMS("CRTC:%d (%s)\n", crtc->base.id, sti_mixer_to_str(mixer));
142
143	/* Disable Background */
144	sti_mixer_set_background_status(mixer, false);
145
146	drm_crtc_vblank_off(crtc);
147
148	/* Disable pixel clock and compo IP clocks */
149	if (mixer->id == STI_MIXER_MAIN) {
150		clk_disable_unprepare(compo->clk_pix_main);
151		clk_disable_unprepare(compo->clk_compo_main);
152	} else {
153		clk_disable_unprepare(compo->clk_pix_aux);
154		clk_disable_unprepare(compo->clk_compo_aux);
155	}
156
157	mixer->enabled = false;
158}
159
160static void
161sti_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
162{
163	sti_drm_crtc_prepare(crtc);
164	sti_drm_crtc_mode_set(crtc, &crtc->state->adjusted_mode);
165}
166
167static void sti_drm_atomic_begin(struct drm_crtc *crtc)
168{
169	struct sti_mixer *mixer = to_sti_mixer(crtc);
170
171	if (crtc->state->event) {
172		crtc->state->event->pipe = drm_crtc_index(crtc);
173
174		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
175
176		mixer->pending_event = crtc->state->event;
177		crtc->state->event = NULL;
178	}
179}
180
181static void sti_drm_atomic_flush(struct drm_crtc *crtc)
182{
183}
184
185static struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
186	.dpms = sti_drm_crtc_dpms,
187	.prepare = sti_drm_crtc_prepare,
188	.commit = sti_drm_crtc_commit,
189	.mode_fixup = sti_drm_crtc_mode_fixup,
190	.mode_set = drm_helper_crtc_mode_set,
191	.mode_set_nofb = sti_drm_crtc_mode_set_nofb,
192	.mode_set_base = drm_helper_crtc_mode_set_base,
193	.disable = sti_drm_crtc_disable,
194	.atomic_begin = sti_drm_atomic_begin,
195	.atomic_flush = sti_drm_atomic_flush,
196};
197
198static void sti_drm_crtc_destroy(struct drm_crtc *crtc)
199{
200	DRM_DEBUG_KMS("\n");
201	drm_crtc_cleanup(crtc);
202}
203
204static int sti_drm_crtc_set_property(struct drm_crtc *crtc,
205				     struct drm_property *property,
206				     uint64_t val)
207{
208	DRM_DEBUG_KMS("\n");
209	return 0;
210}
211
212int sti_drm_crtc_vblank_cb(struct notifier_block *nb,
213			   unsigned long event, void *data)
214{
215	struct drm_device *drm_dev;
216	struct sti_compositor *compo =
217		container_of(nb, struct sti_compositor, vtg_vblank_nb);
218	int *crtc = data;
219	unsigned long flags;
220	struct sti_drm_private *priv;
221
222	drm_dev = compo->mixer[*crtc]->drm_crtc.dev;
223	priv = drm_dev->dev_private;
224
225	if ((event != VTG_TOP_FIELD_EVENT) &&
226	    (event != VTG_BOTTOM_FIELD_EVENT)) {
227		DRM_ERROR("unknown event: %lu\n", event);
228		return -EINVAL;
229	}
230
231	drm_handle_vblank(drm_dev, *crtc);
232
233	spin_lock_irqsave(&drm_dev->event_lock, flags);
234	if (compo->mixer[*crtc]->pending_event) {
235		drm_send_vblank_event(drm_dev, -1,
236				compo->mixer[*crtc]->pending_event);
237		drm_vblank_put(drm_dev, *crtc);
238		compo->mixer[*crtc]->pending_event = NULL;
239	}
240	spin_unlock_irqrestore(&drm_dev->event_lock, flags);
241
242	return 0;
243}
244
245int sti_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
246{
247	struct sti_drm_private *dev_priv = dev->dev_private;
248	struct sti_compositor *compo = dev_priv->compo;
249	struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
250
251	if (sti_vtg_register_client(crtc == STI_MIXER_MAIN ?
252			compo->vtg_main : compo->vtg_aux,
253			vtg_vblank_nb, crtc)) {
254		DRM_ERROR("Cannot register VTG notifier\n");
255		return -EINVAL;
256	}
257
258	return 0;
259}
260EXPORT_SYMBOL(sti_drm_crtc_enable_vblank);
261
262void sti_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
263{
264	struct sti_drm_private *priv = dev->dev_private;
265	struct sti_compositor *compo = priv->compo;
266	struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
267
268	DRM_DEBUG_DRIVER("\n");
269
270	if (sti_vtg_unregister_client(crtc == STI_MIXER_MAIN ?
271			compo->vtg_main : compo->vtg_aux, vtg_vblank_nb))
272		DRM_DEBUG_DRIVER("Warning: cannot unregister VTG notifier\n");
273
274	/* free the resources of the pending requests */
275	if (compo->mixer[crtc]->pending_event) {
276		drm_vblank_put(dev, crtc);
277		compo->mixer[crtc]->pending_event = NULL;
278	}
279}
280EXPORT_SYMBOL(sti_drm_crtc_disable_vblank);
281
282static struct drm_crtc_funcs sti_crtc_funcs = {
283	.set_config = drm_atomic_helper_set_config,
284	.page_flip = drm_atomic_helper_page_flip,
285	.destroy = sti_drm_crtc_destroy,
286	.set_property = sti_drm_crtc_set_property,
287	.reset = drm_atomic_helper_crtc_reset,
288	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
289	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
290};
291
292bool sti_drm_crtc_is_main(struct drm_crtc *crtc)
293{
294	struct sti_mixer *mixer = to_sti_mixer(crtc);
295
296	if (mixer->id == STI_MIXER_MAIN)
297		return true;
298
299	return false;
300}
301EXPORT_SYMBOL(sti_drm_crtc_is_main);
302
303int sti_drm_crtc_init(struct drm_device *drm_dev, struct sti_mixer *mixer,
304		struct drm_plane *primary, struct drm_plane *cursor)
305{
306	struct drm_crtc *crtc = &mixer->drm_crtc;
307	int res;
308
309	res = drm_crtc_init_with_planes(drm_dev, crtc, primary, cursor,
310			&sti_crtc_funcs);
311	if (res) {
312		DRM_ERROR("Can not initialze CRTC\n");
313		return -EINVAL;
314	}
315
316	drm_crtc_helper_add(crtc, &sti_crtc_helper_funcs);
317
318	DRM_DEBUG_DRIVER("drm CRTC:%d mapped to %s\n",
319			 crtc->base.id, sti_mixer_to_str(mixer));
320
321	return 0;
322}
323