1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2015 Free Electrons
4  * Copyright (C) 2015 NextThing Co
5  *
6  * Maxime Ripard <maxime.ripard@free-electrons.com>
7  */
8 
9 #include <linux/clk-provider.h>
10 #include <linux/ioport.h>
11 #include <linux/of_address.h>
12 #include <linux/of_graph.h>
13 #include <linux/of_irq.h>
14 #include <linux/regmap.h>
15 
16 #include <video/videomode.h>
17 
18 #include <drm/drm_atomic.h>
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_crtc.h>
21 #include <drm/drm_modes.h>
22 #include <drm/drm_print.h>
23 #include <drm/drm_probe_helper.h>
24 #include <drm/drm_vblank.h>
25 
26 #include "sun4i_backend.h"
27 #include "sun4i_crtc.h"
28 #include "sun4i_drv.h"
29 #include "sunxi_engine.h"
30 #include "sun4i_tcon.h"
31 
32 /*
33  * While this isn't really working in the DRM theory, in practice we
34  * can only ever have one encoder per TCON since we have a mux in our
35  * TCON.
36  */
sun4i_crtc_get_encoder(struct drm_crtc * crtc)37 static struct drm_encoder *sun4i_crtc_get_encoder(struct drm_crtc *crtc)
38 {
39 	struct drm_encoder *encoder;
40 
41 	drm_for_each_encoder(encoder, crtc->dev)
42 		if (encoder->crtc == crtc)
43 			return encoder;
44 
45 	return NULL;
46 }
47 
sun4i_crtc_atomic_check(struct drm_crtc * crtc,struct drm_atomic_state * state)48 static int sun4i_crtc_atomic_check(struct drm_crtc *crtc,
49 				    struct drm_atomic_state *state)
50 {
51 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
52 									  crtc);
53 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
54 	struct sunxi_engine *engine = scrtc->engine;
55 	int ret = 0;
56 
57 	if (engine && engine->ops && engine->ops->atomic_check)
58 		ret = engine->ops->atomic_check(engine, crtc_state);
59 
60 	return ret;
61 }
62 
sun4i_crtc_atomic_begin(struct drm_crtc * crtc,struct drm_atomic_state * state)63 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
64 				    struct drm_atomic_state *state)
65 {
66 	struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
67 									 crtc);
68 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
69 	struct drm_device *dev = crtc->dev;
70 	struct sunxi_engine *engine = scrtc->engine;
71 	unsigned long flags;
72 
73 	if (crtc->state->event) {
74 		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
75 
76 		spin_lock_irqsave(&dev->event_lock, flags);
77 		scrtc->event = crtc->state->event;
78 		spin_unlock_irqrestore(&dev->event_lock, flags);
79 		crtc->state->event = NULL;
80 	}
81 
82 	if (engine->ops->atomic_begin)
83 		engine->ops->atomic_begin(engine, old_state);
84 }
85 
sun4i_crtc_atomic_flush(struct drm_crtc * crtc,struct drm_atomic_state * state)86 static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
87 				    struct drm_atomic_state *state)
88 {
89 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
90 	struct drm_pending_vblank_event *event = crtc->state->event;
91 
92 	DRM_DEBUG_DRIVER("Committing plane changes\n");
93 
94 	sunxi_engine_commit(scrtc->engine);
95 
96 	if (event) {
97 		crtc->state->event = NULL;
98 
99 		spin_lock_irq(&crtc->dev->event_lock);
100 		if (drm_crtc_vblank_get(crtc) == 0)
101 			drm_crtc_arm_vblank_event(crtc, event);
102 		else
103 			drm_crtc_send_vblank_event(crtc, event);
104 		spin_unlock_irq(&crtc->dev->event_lock);
105 	}
106 }
107 
sun4i_crtc_atomic_disable(struct drm_crtc * crtc,struct drm_atomic_state * state)108 static void sun4i_crtc_atomic_disable(struct drm_crtc *crtc,
109 				      struct drm_atomic_state *state)
110 {
111 	struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
112 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
113 
114 	DRM_DEBUG_DRIVER("Disabling the CRTC\n");
115 
116 	drm_crtc_vblank_off(crtc);
117 
118 	sun4i_tcon_set_status(scrtc->tcon, encoder, false);
119 
120 	if (crtc->state->event && !crtc->state->active) {
121 		spin_lock_irq(&crtc->dev->event_lock);
122 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
123 		spin_unlock_irq(&crtc->dev->event_lock);
124 
125 		crtc->state->event = NULL;
126 	}
127 }
128 
sun4i_crtc_atomic_enable(struct drm_crtc * crtc,struct drm_atomic_state * state)129 static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc,
130 				     struct drm_atomic_state *state)
131 {
132 	struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
133 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
134 
135 	DRM_DEBUG_DRIVER("Enabling the CRTC\n");
136 
137 	sun4i_tcon_set_status(scrtc->tcon, encoder, true);
138 
139 	drm_crtc_vblank_on(crtc);
140 }
141 
sun4i_crtc_mode_set_nofb(struct drm_crtc * crtc)142 static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)
143 {
144 	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
145 	struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
146 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
147 
148 	sun4i_tcon_mode_set(scrtc->tcon, encoder, mode);
149 }
150 
151 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
152 	.atomic_check	= sun4i_crtc_atomic_check,
153 	.atomic_begin	= sun4i_crtc_atomic_begin,
154 	.atomic_flush	= sun4i_crtc_atomic_flush,
155 	.atomic_enable	= sun4i_crtc_atomic_enable,
156 	.atomic_disable	= sun4i_crtc_atomic_disable,
157 	.mode_set_nofb	= sun4i_crtc_mode_set_nofb,
158 };
159 
sun4i_crtc_enable_vblank(struct drm_crtc * crtc)160 static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc)
161 {
162 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
163 
164 	DRM_DEBUG_DRIVER("Enabling VBLANK on crtc %p\n", crtc);
165 
166 	sun4i_tcon_enable_vblank(scrtc->tcon, true);
167 
168 	return 0;
169 }
170 
sun4i_crtc_disable_vblank(struct drm_crtc * crtc)171 static void sun4i_crtc_disable_vblank(struct drm_crtc *crtc)
172 {
173 	struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
174 
175 	DRM_DEBUG_DRIVER("Disabling VBLANK on crtc %p\n", crtc);
176 
177 	sun4i_tcon_enable_vblank(scrtc->tcon, false);
178 }
179 
180 static const struct drm_crtc_funcs sun4i_crtc_funcs = {
181 	.atomic_destroy_state	= drm_atomic_helper_crtc_destroy_state,
182 	.atomic_duplicate_state	= drm_atomic_helper_crtc_duplicate_state,
183 	.destroy		= drm_crtc_cleanup,
184 	.page_flip		= drm_atomic_helper_page_flip,
185 	.reset			= drm_atomic_helper_crtc_reset,
186 	.set_config		= drm_atomic_helper_set_config,
187 	.enable_vblank		= sun4i_crtc_enable_vblank,
188 	.disable_vblank		= sun4i_crtc_disable_vblank,
189 };
190 
sun4i_crtc_init(struct drm_device * drm,struct sunxi_engine * engine,struct sun4i_tcon * tcon)191 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
192 				   struct sunxi_engine *engine,
193 				   struct sun4i_tcon *tcon)
194 {
195 	struct sun4i_crtc *scrtc;
196 	struct drm_plane **planes;
197 	struct drm_plane *primary = NULL, *cursor = NULL;
198 	int ret, i;
199 
200 	scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
201 	if (!scrtc)
202 		return ERR_PTR(-ENOMEM);
203 	scrtc->engine = engine;
204 	scrtc->tcon = tcon;
205 
206 	/* Create our layers */
207 	planes = sunxi_engine_layers_init(drm, engine);
208 	if (IS_ERR(planes)) {
209 		dev_err(drm->dev, "Couldn't create the planes\n");
210 		return NULL;
211 	}
212 
213 	/* find primary and cursor planes for drm_crtc_init_with_planes */
214 	for (i = 0; planes[i]; i++) {
215 		struct drm_plane *plane = planes[i];
216 
217 		switch (plane->type) {
218 		case DRM_PLANE_TYPE_PRIMARY:
219 			primary = plane;
220 			break;
221 		case DRM_PLANE_TYPE_CURSOR:
222 			cursor = plane;
223 			break;
224 		default:
225 			break;
226 		}
227 	}
228 
229 	ret = drm_crtc_init_with_planes(drm, &scrtc->crtc,
230 					primary,
231 					cursor,
232 					&sun4i_crtc_funcs,
233 					NULL);
234 	if (ret) {
235 		dev_err(drm->dev, "Couldn't init DRM CRTC\n");
236 		return ERR_PTR(ret);
237 	}
238 
239 	drm_crtc_helper_add(&scrtc->crtc, &sun4i_crtc_helper_funcs);
240 
241 	/* Set crtc.port to output port node of the tcon */
242 	scrtc->crtc.port = of_graph_get_port_by_id(scrtc->tcon->dev->of_node,
243 						   1);
244 
245 	/* Set possible_crtcs to this crtc for overlay planes */
246 	for (i = 0; planes[i]; i++) {
247 		uint32_t possible_crtcs = drm_crtc_mask(&scrtc->crtc);
248 		struct drm_plane *plane = planes[i];
249 
250 		if (plane->type == DRM_PLANE_TYPE_OVERLAY)
251 			plane->possible_crtcs = possible_crtcs;
252 	}
253 
254 	return scrtc;
255 }
256