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_crtc_state *old_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_crtc_state *old_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 	if (crtc->state->event && !crtc->state->active) {
43 		spin_lock_irq(&crtc->dev->event_lock);
44 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
45 		spin_unlock_irq(&crtc->dev->event_lock);
46 
47 		crtc->state->event = NULL;
48 	}
49 }
50 
51 static int exynos_crtc_atomic_check(struct drm_crtc *crtc,
52 				     struct drm_crtc_state *state)
53 {
54 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
55 
56 	if (!state->enable)
57 		return 0;
58 
59 	if (exynos_crtc->ops->atomic_check)
60 		return exynos_crtc->ops->atomic_check(exynos_crtc, state);
61 
62 	return 0;
63 }
64 
65 static void exynos_crtc_atomic_begin(struct drm_crtc *crtc,
66 				     struct drm_crtc_state *old_crtc_state)
67 {
68 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
69 
70 	if (exynos_crtc->ops->atomic_begin)
71 		exynos_crtc->ops->atomic_begin(exynos_crtc);
72 }
73 
74 static void exynos_crtc_atomic_flush(struct drm_crtc *crtc,
75 				     struct drm_crtc_state *old_crtc_state)
76 {
77 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
78 
79 	if (exynos_crtc->ops->atomic_flush)
80 		exynos_crtc->ops->atomic_flush(exynos_crtc);
81 }
82 
83 static enum drm_mode_status exynos_crtc_mode_valid(struct drm_crtc *crtc,
84 	const struct drm_display_mode *mode)
85 {
86 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
87 
88 	if (exynos_crtc->ops->mode_valid)
89 		return exynos_crtc->ops->mode_valid(exynos_crtc, mode);
90 
91 	return MODE_OK;
92 }
93 
94 static bool exynos_crtc_mode_fixup(struct drm_crtc *crtc,
95 		const struct drm_display_mode *mode,
96 		struct drm_display_mode *adjusted_mode)
97 {
98 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
99 
100 	if (exynos_crtc->ops->mode_fixup)
101 		return exynos_crtc->ops->mode_fixup(exynos_crtc, mode,
102 				adjusted_mode);
103 
104 	return true;
105 }
106 
107 
108 static const struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
109 	.mode_valid	= exynos_crtc_mode_valid,
110 	.mode_fixup	= exynos_crtc_mode_fixup,
111 	.atomic_check	= exynos_crtc_atomic_check,
112 	.atomic_begin	= exynos_crtc_atomic_begin,
113 	.atomic_flush	= exynos_crtc_atomic_flush,
114 	.atomic_enable	= exynos_drm_crtc_atomic_enable,
115 	.atomic_disable	= exynos_drm_crtc_atomic_disable,
116 };
117 
118 void exynos_crtc_handle_event(struct exynos_drm_crtc *exynos_crtc)
119 {
120 	struct drm_crtc *crtc = &exynos_crtc->base;
121 	struct drm_pending_vblank_event *event = crtc->state->event;
122 	unsigned long flags;
123 
124 	if (!event)
125 		return;
126 	crtc->state->event = NULL;
127 
128 	WARN_ON(drm_crtc_vblank_get(crtc) != 0);
129 
130 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
131 	drm_crtc_arm_vblank_event(crtc, event);
132 	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
133 }
134 
135 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
136 {
137 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
138 
139 	drm_crtc_cleanup(crtc);
140 	kfree(exynos_crtc);
141 }
142 
143 static int exynos_drm_crtc_enable_vblank(struct drm_crtc *crtc)
144 {
145 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
146 
147 	if (exynos_crtc->ops->enable_vblank)
148 		return exynos_crtc->ops->enable_vblank(exynos_crtc);
149 
150 	return 0;
151 }
152 
153 static void exynos_drm_crtc_disable_vblank(struct drm_crtc *crtc)
154 {
155 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
156 
157 	if (exynos_crtc->ops->disable_vblank)
158 		exynos_crtc->ops->disable_vblank(exynos_crtc);
159 }
160 
161 static const struct drm_crtc_funcs exynos_crtc_funcs = {
162 	.set_config	= drm_atomic_helper_set_config,
163 	.page_flip	= drm_atomic_helper_page_flip,
164 	.destroy	= exynos_drm_crtc_destroy,
165 	.reset = drm_atomic_helper_crtc_reset,
166 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
167 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
168 	.enable_vblank = exynos_drm_crtc_enable_vblank,
169 	.disable_vblank = exynos_drm_crtc_disable_vblank,
170 };
171 
172 struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
173 					struct drm_plane *plane,
174 					enum exynos_drm_output_type type,
175 					const struct exynos_drm_crtc_ops *ops,
176 					void *ctx)
177 {
178 	struct exynos_drm_crtc *exynos_crtc;
179 	struct drm_crtc *crtc;
180 	int ret;
181 
182 	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
183 	if (!exynos_crtc)
184 		return ERR_PTR(-ENOMEM);
185 
186 	exynos_crtc->type = type;
187 	exynos_crtc->ops = ops;
188 	exynos_crtc->ctx = ctx;
189 
190 	crtc = &exynos_crtc->base;
191 
192 	ret = drm_crtc_init_with_planes(drm_dev, crtc, plane, NULL,
193 					&exynos_crtc_funcs, NULL);
194 	if (ret < 0)
195 		goto err_crtc;
196 
197 	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
198 
199 	return exynos_crtc;
200 
201 err_crtc:
202 	plane->funcs->destroy(plane);
203 	kfree(exynos_crtc);
204 	return ERR_PTR(ret);
205 }
206 
207 struct exynos_drm_crtc *exynos_drm_crtc_get_by_type(struct drm_device *drm_dev,
208 				       enum exynos_drm_output_type out_type)
209 {
210 	struct drm_crtc *crtc;
211 
212 	drm_for_each_crtc(crtc, drm_dev)
213 		if (to_exynos_crtc(crtc)->type == out_type)
214 			return to_exynos_crtc(crtc);
215 
216 	return ERR_PTR(-ENODEV);
217 }
218 
219 int exynos_drm_set_possible_crtcs(struct drm_encoder *encoder,
220 		enum exynos_drm_output_type out_type)
221 {
222 	struct exynos_drm_crtc *crtc = exynos_drm_crtc_get_by_type(encoder->dev,
223 						out_type);
224 
225 	if (IS_ERR(crtc))
226 		return PTR_ERR(crtc);
227 
228 	encoder->possible_crtcs = drm_crtc_mask(&crtc->base);
229 
230 	return 0;
231 }
232 
233 void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
234 {
235 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
236 
237 	if (exynos_crtc->ops->te_handler)
238 		exynos_crtc->ops->te_handler(exynos_crtc);
239 }
240