1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* exynos_drm_crtc.c
3  *
4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5  * Authors:
6  *	Inki Dae <inki.dae@samsung.com>
7  *	Joonyoung Shim <jy0922.shim@samsung.com>
8  *	Seung-Woo Kim <sw0312.kim@samsung.com>
9  */
10 
11 #include <drm/drm_atomic.h>
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_encoder.h>
14 #include <drm/drm_probe_helper.h>
15 #include <drm/drm_vblank.h>
16 
17 #include "exynos_drm_crtc.h"
18 #include "exynos_drm_drv.h"
19 #include "exynos_drm_plane.h"
20 
21 static void exynos_drm_crtc_atomic_enable(struct drm_crtc *crtc,
22 					  struct drm_atomic_state *state)
23 {
24 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
25 
26 	if (exynos_crtc->ops->atomic_enable)
27 		exynos_crtc->ops->atomic_enable(exynos_crtc);
28 
29 	drm_crtc_vblank_on(crtc);
30 }
31 
32 static void exynos_drm_crtc_atomic_disable(struct drm_crtc *crtc,
33 					   struct drm_atomic_state *state)
34 {
35 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
36 
37 	drm_crtc_vblank_off(crtc);
38 
39 	if (exynos_crtc->ops->atomic_disable)
40 		exynos_crtc->ops->atomic_disable(exynos_crtc);
41 
42 	spin_lock_irq(&crtc->dev->event_lock);
43 	if (crtc->state->event && !crtc->state->active) {
44 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
45 		crtc->state->event = NULL;
46 	}
47 	spin_unlock_irq(&crtc->dev->event_lock);
48 }
49 
50 static int exynos_crtc_atomic_check(struct drm_crtc *crtc,
51 				     struct drm_atomic_state *state)
52 {
53 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
54 									  crtc);
55 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
56 
57 	if (!crtc_state->enable)
58 		return 0;
59 
60 	if (exynos_crtc->ops->atomic_check)
61 		return exynos_crtc->ops->atomic_check(exynos_crtc, crtc_state);
62 
63 	return 0;
64 }
65 
66 static void exynos_crtc_atomic_begin(struct drm_crtc *crtc,
67 				     struct drm_atomic_state *state)
68 {
69 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
70 
71 	if (exynos_crtc->ops->atomic_begin)
72 		exynos_crtc->ops->atomic_begin(exynos_crtc);
73 }
74 
75 static void exynos_crtc_atomic_flush(struct drm_crtc *crtc,
76 				     struct drm_atomic_state *state)
77 {
78 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
79 
80 	if (exynos_crtc->ops->atomic_flush)
81 		exynos_crtc->ops->atomic_flush(exynos_crtc);
82 }
83 
84 static enum drm_mode_status exynos_crtc_mode_valid(struct drm_crtc *crtc,
85 	const struct drm_display_mode *mode)
86 {
87 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
88 
89 	if (exynos_crtc->ops->mode_valid)
90 		return exynos_crtc->ops->mode_valid(exynos_crtc, mode);
91 
92 	return MODE_OK;
93 }
94 
95 static bool exynos_crtc_mode_fixup(struct drm_crtc *crtc,
96 		const struct drm_display_mode *mode,
97 		struct drm_display_mode *adjusted_mode)
98 {
99 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
100 
101 	if (exynos_crtc->ops->mode_fixup)
102 		return exynos_crtc->ops->mode_fixup(exynos_crtc, mode,
103 				adjusted_mode);
104 
105 	return true;
106 }
107 
108 
109 static const struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
110 	.mode_valid	= exynos_crtc_mode_valid,
111 	.mode_fixup	= exynos_crtc_mode_fixup,
112 	.atomic_check	= exynos_crtc_atomic_check,
113 	.atomic_begin	= exynos_crtc_atomic_begin,
114 	.atomic_flush	= exynos_crtc_atomic_flush,
115 	.atomic_enable	= exynos_drm_crtc_atomic_enable,
116 	.atomic_disable	= exynos_drm_crtc_atomic_disable,
117 };
118 
119 void exynos_crtc_handle_event(struct exynos_drm_crtc *exynos_crtc)
120 {
121 	struct drm_crtc *crtc = &exynos_crtc->base;
122 	struct drm_pending_vblank_event *event = crtc->state->event;
123 	unsigned long flags;
124 
125 	if (!event)
126 		return;
127 	crtc->state->event = NULL;
128 
129 	WARN_ON(drm_crtc_vblank_get(crtc) != 0);
130 
131 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
132 	drm_crtc_arm_vblank_event(crtc, event);
133 	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
134 }
135 
136 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
137 {
138 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
139 
140 	drm_crtc_cleanup(crtc);
141 	kfree(exynos_crtc);
142 }
143 
144 static int exynos_drm_crtc_enable_vblank(struct drm_crtc *crtc)
145 {
146 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
147 
148 	if (exynos_crtc->ops->enable_vblank)
149 		return exynos_crtc->ops->enable_vblank(exynos_crtc);
150 
151 	return 0;
152 }
153 
154 static void exynos_drm_crtc_disable_vblank(struct drm_crtc *crtc)
155 {
156 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
157 
158 	if (exynos_crtc->ops->disable_vblank)
159 		exynos_crtc->ops->disable_vblank(exynos_crtc);
160 }
161 
162 static const struct drm_crtc_funcs exynos_crtc_funcs = {
163 	.set_config	= drm_atomic_helper_set_config,
164 	.page_flip	= drm_atomic_helper_page_flip,
165 	.destroy	= exynos_drm_crtc_destroy,
166 	.reset = drm_atomic_helper_crtc_reset,
167 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
168 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
169 	.enable_vblank = exynos_drm_crtc_enable_vblank,
170 	.disable_vblank = exynos_drm_crtc_disable_vblank,
171 };
172 
173 struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
174 					struct drm_plane *plane,
175 					enum exynos_drm_output_type type,
176 					const struct exynos_drm_crtc_ops *ops,
177 					void *ctx)
178 {
179 	struct exynos_drm_crtc *exynos_crtc;
180 	struct drm_crtc *crtc;
181 	int ret;
182 
183 	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
184 	if (!exynos_crtc)
185 		return ERR_PTR(-ENOMEM);
186 
187 	exynos_crtc->type = type;
188 	exynos_crtc->ops = ops;
189 	exynos_crtc->ctx = ctx;
190 
191 	crtc = &exynos_crtc->base;
192 
193 	ret = drm_crtc_init_with_planes(drm_dev, crtc, plane, NULL,
194 					&exynos_crtc_funcs, NULL);
195 	if (ret < 0)
196 		goto err_crtc;
197 
198 	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
199 
200 	return exynos_crtc;
201 
202 err_crtc:
203 	plane->funcs->destroy(plane);
204 	kfree(exynos_crtc);
205 	return ERR_PTR(ret);
206 }
207 
208 struct exynos_drm_crtc *exynos_drm_crtc_get_by_type(struct drm_device *drm_dev,
209 				       enum exynos_drm_output_type out_type)
210 {
211 	struct drm_crtc *crtc;
212 
213 	drm_for_each_crtc(crtc, drm_dev)
214 		if (to_exynos_crtc(crtc)->type == out_type)
215 			return to_exynos_crtc(crtc);
216 
217 	return ERR_PTR(-ENODEV);
218 }
219 
220 int exynos_drm_set_possible_crtcs(struct drm_encoder *encoder,
221 		enum exynos_drm_output_type out_type)
222 {
223 	struct exynos_drm_crtc *crtc = exynos_drm_crtc_get_by_type(encoder->dev,
224 						out_type);
225 
226 	if (IS_ERR(crtc))
227 		return PTR_ERR(crtc);
228 
229 	encoder->possible_crtcs = drm_crtc_mask(&crtc->base);
230 
231 	return 0;
232 }
233 
234 void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
235 {
236 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
237 
238 	if (exynos_crtc->ops->te_handler)
239 		exynos_crtc->ops->te_handler(exynos_crtc);
240 }
241