1 /* exynos_drm_crtc.c
2  *
3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4  * Authors:
5  *	Inki Dae <inki.dae@samsung.com>
6  *	Joonyoung Shim <jy0922.shim@samsung.com>
7  *	Seung-Woo Kim <sw0312.kim@samsung.com>
8  *
9  * This program is free software; you can redistribute  it and/or modify it
10  * under  the terms of  the GNU General  Public License as published by the
11  * Free Software Foundation;  either version 2 of the  License, or (at your
12  * option) any later version.
13  */
14 
15 #include <drm/drmP.h>
16 #include <drm/drm_atomic.h>
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_encoder.h>
19 #include <drm/drm_probe_helper.h>
20 
21 #include "exynos_drm_crtc.h"
22 #include "exynos_drm_drv.h"
23 #include "exynos_drm_plane.h"
24 
25 static void exynos_drm_crtc_atomic_enable(struct drm_crtc *crtc,
26 					  struct drm_crtc_state *old_state)
27 {
28 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
29 
30 	if (exynos_crtc->ops->enable)
31 		exynos_crtc->ops->enable(exynos_crtc);
32 
33 	drm_crtc_vblank_on(crtc);
34 }
35 
36 static void exynos_drm_crtc_atomic_disable(struct drm_crtc *crtc,
37 					   struct drm_crtc_state *old_state)
38 {
39 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
40 
41 	drm_crtc_vblank_off(crtc);
42 
43 	if (exynos_crtc->ops->disable)
44 		exynos_crtc->ops->disable(exynos_crtc);
45 
46 	if (crtc->state->event && !crtc->state->active) {
47 		spin_lock_irq(&crtc->dev->event_lock);
48 		drm_crtc_send_vblank_event(crtc, crtc->state->event);
49 		spin_unlock_irq(&crtc->dev->event_lock);
50 
51 		crtc->state->event = NULL;
52 	}
53 }
54 
55 static int exynos_crtc_atomic_check(struct drm_crtc *crtc,
56 				     struct drm_crtc_state *state)
57 {
58 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
59 
60 	if (!state->enable)
61 		return 0;
62 
63 	if (exynos_crtc->ops->atomic_check)
64 		return exynos_crtc->ops->atomic_check(exynos_crtc, state);
65 
66 	return 0;
67 }
68 
69 static void exynos_crtc_atomic_begin(struct drm_crtc *crtc,
70 				     struct drm_crtc_state *old_crtc_state)
71 {
72 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
73 
74 	if (exynos_crtc->ops->atomic_begin)
75 		exynos_crtc->ops->atomic_begin(exynos_crtc);
76 }
77 
78 static void exynos_crtc_atomic_flush(struct drm_crtc *crtc,
79 				     struct drm_crtc_state *old_crtc_state)
80 {
81 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
82 
83 	if (exynos_crtc->ops->atomic_flush)
84 		exynos_crtc->ops->atomic_flush(exynos_crtc);
85 }
86 
87 static enum drm_mode_status exynos_crtc_mode_valid(struct drm_crtc *crtc,
88 	const struct drm_display_mode *mode)
89 {
90 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
91 
92 	if (exynos_crtc->ops->mode_valid)
93 		return exynos_crtc->ops->mode_valid(exynos_crtc, mode);
94 
95 	return MODE_OK;
96 }
97 
98 static bool exynos_crtc_mode_fixup(struct drm_crtc *crtc,
99 		const struct drm_display_mode *mode,
100 		struct drm_display_mode *adjusted_mode)
101 {
102 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
103 
104 	if (exynos_crtc->ops->mode_fixup)
105 		return exynos_crtc->ops->mode_fixup(exynos_crtc, mode,
106 				adjusted_mode);
107 
108 	return true;
109 }
110 
111 
112 static const struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
113 	.mode_valid	= exynos_crtc_mode_valid,
114 	.mode_fixup	= exynos_crtc_mode_fixup,
115 	.atomic_check	= exynos_crtc_atomic_check,
116 	.atomic_begin	= exynos_crtc_atomic_begin,
117 	.atomic_flush	= exynos_crtc_atomic_flush,
118 	.atomic_enable	= exynos_drm_crtc_atomic_enable,
119 	.atomic_disable	= exynos_drm_crtc_atomic_disable,
120 };
121 
122 void exynos_crtc_handle_event(struct exynos_drm_crtc *exynos_crtc)
123 {
124 	struct drm_crtc *crtc = &exynos_crtc->base;
125 	struct drm_pending_vblank_event *event = crtc->state->event;
126 	unsigned long flags;
127 
128 	if (!event)
129 		return;
130 	crtc->state->event = NULL;
131 
132 	WARN_ON(drm_crtc_vblank_get(crtc) != 0);
133 
134 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
135 	drm_crtc_arm_vblank_event(crtc, event);
136 	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
137 }
138 
139 static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
140 {
141 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
142 
143 	drm_crtc_cleanup(crtc);
144 	kfree(exynos_crtc);
145 }
146 
147 static int exynos_drm_crtc_enable_vblank(struct drm_crtc *crtc)
148 {
149 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
150 
151 	if (exynos_crtc->ops->enable_vblank)
152 		return exynos_crtc->ops->enable_vblank(exynos_crtc);
153 
154 	return 0;
155 }
156 
157 static void exynos_drm_crtc_disable_vblank(struct drm_crtc *crtc)
158 {
159 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
160 
161 	if (exynos_crtc->ops->disable_vblank)
162 		exynos_crtc->ops->disable_vblank(exynos_crtc);
163 }
164 
165 static const struct drm_crtc_funcs exynos_crtc_funcs = {
166 	.set_config	= drm_atomic_helper_set_config,
167 	.page_flip	= drm_atomic_helper_page_flip,
168 	.destroy	= exynos_drm_crtc_destroy,
169 	.reset = drm_atomic_helper_crtc_reset,
170 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
171 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
172 	.enable_vblank = exynos_drm_crtc_enable_vblank,
173 	.disable_vblank = exynos_drm_crtc_disable_vblank,
174 };
175 
176 struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
177 					struct drm_plane *plane,
178 					enum exynos_drm_output_type type,
179 					const struct exynos_drm_crtc_ops *ops,
180 					void *ctx)
181 {
182 	struct exynos_drm_crtc *exynos_crtc;
183 	struct drm_crtc *crtc;
184 	int ret;
185 
186 	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
187 	if (!exynos_crtc)
188 		return ERR_PTR(-ENOMEM);
189 
190 	exynos_crtc->type = type;
191 	exynos_crtc->ops = ops;
192 	exynos_crtc->ctx = ctx;
193 
194 	crtc = &exynos_crtc->base;
195 
196 	ret = drm_crtc_init_with_planes(drm_dev, crtc, plane, NULL,
197 					&exynos_crtc_funcs, NULL);
198 	if (ret < 0)
199 		goto err_crtc;
200 
201 	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);
202 
203 	return exynos_crtc;
204 
205 err_crtc:
206 	plane->funcs->destroy(plane);
207 	kfree(exynos_crtc);
208 	return ERR_PTR(ret);
209 }
210 
211 struct exynos_drm_crtc *exynos_drm_crtc_get_by_type(struct drm_device *drm_dev,
212 				       enum exynos_drm_output_type out_type)
213 {
214 	struct drm_crtc *crtc;
215 
216 	drm_for_each_crtc(crtc, drm_dev)
217 		if (to_exynos_crtc(crtc)->type == out_type)
218 			return to_exynos_crtc(crtc);
219 
220 	return ERR_PTR(-ENODEV);
221 }
222 
223 int exynos_drm_set_possible_crtcs(struct drm_encoder *encoder,
224 		enum exynos_drm_output_type out_type)
225 {
226 	struct exynos_drm_crtc *crtc = exynos_drm_crtc_get_by_type(encoder->dev,
227 						out_type);
228 
229 	if (IS_ERR(crtc))
230 		return PTR_ERR(crtc);
231 
232 	encoder->possible_crtcs = drm_crtc_mask(&crtc->base);
233 
234 	return 0;
235 }
236 
237 void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
238 {
239 	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
240 
241 	if (exynos_crtc->ops->te_handler)
242 		exynos_crtc->ops->te_handler(exynos_crtc);
243 }
244