1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Free Electrons
4 * Maxime Ripard <maxime.ripard@free-electrons.com>
5 */
6
7 #include <linux/clk.h>
8
9 #include <drm/drmP.h>
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_crtc_helper.h>
12 #include <drm/drm_of.h>
13 #include <drm/drm_panel.h>
14
15 #include "sun4i_crtc.h"
16 #include "sun4i_tcon.h"
17 #include "sun4i_lvds.h"
18
19 struct sun4i_lvds {
20 struct drm_connector connector;
21 struct drm_encoder encoder;
22
23 struct sun4i_tcon *tcon;
24 };
25
26 static inline struct sun4i_lvds *
drm_connector_to_sun4i_lvds(struct drm_connector * connector)27 drm_connector_to_sun4i_lvds(struct drm_connector *connector)
28 {
29 return container_of(connector, struct sun4i_lvds,
30 connector);
31 }
32
33 static inline struct sun4i_lvds *
drm_encoder_to_sun4i_lvds(struct drm_encoder * encoder)34 drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder)
35 {
36 return container_of(encoder, struct sun4i_lvds,
37 encoder);
38 }
39
sun4i_lvds_get_modes(struct drm_connector * connector)40 static int sun4i_lvds_get_modes(struct drm_connector *connector)
41 {
42 struct sun4i_lvds *lvds =
43 drm_connector_to_sun4i_lvds(connector);
44 struct sun4i_tcon *tcon = lvds->tcon;
45
46 return drm_panel_get_modes(tcon->panel);
47 }
48
49 static struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
50 .get_modes = sun4i_lvds_get_modes,
51 };
52
53 static void
sun4i_lvds_connector_destroy(struct drm_connector * connector)54 sun4i_lvds_connector_destroy(struct drm_connector *connector)
55 {
56 struct sun4i_lvds *lvds = drm_connector_to_sun4i_lvds(connector);
57 struct sun4i_tcon *tcon = lvds->tcon;
58
59 drm_panel_detach(tcon->panel);
60 drm_connector_cleanup(connector);
61 }
62
63 static const struct drm_connector_funcs sun4i_lvds_con_funcs = {
64 .fill_modes = drm_helper_probe_single_connector_modes,
65 .destroy = sun4i_lvds_connector_destroy,
66 .reset = drm_atomic_helper_connector_reset,
67 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
68 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
69 };
70
sun4i_lvds_encoder_enable(struct drm_encoder * encoder)71 static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder)
72 {
73 struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
74 struct sun4i_tcon *tcon = lvds->tcon;
75
76 DRM_DEBUG_DRIVER("Enabling LVDS output\n");
77
78 if (!IS_ERR(tcon->panel)) {
79 drm_panel_prepare(tcon->panel);
80 drm_panel_enable(tcon->panel);
81 }
82 }
83
sun4i_lvds_encoder_disable(struct drm_encoder * encoder)84 static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder)
85 {
86 struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
87 struct sun4i_tcon *tcon = lvds->tcon;
88
89 DRM_DEBUG_DRIVER("Disabling LVDS output\n");
90
91 if (!IS_ERR(tcon->panel)) {
92 drm_panel_disable(tcon->panel);
93 drm_panel_unprepare(tcon->panel);
94 }
95 }
96
97 static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = {
98 .disable = sun4i_lvds_encoder_disable,
99 .enable = sun4i_lvds_encoder_enable,
100 };
101
102 static const struct drm_encoder_funcs sun4i_lvds_enc_funcs = {
103 .destroy = drm_encoder_cleanup,
104 };
105
sun4i_lvds_init(struct drm_device * drm,struct sun4i_tcon * tcon)106 int sun4i_lvds_init(struct drm_device *drm, struct sun4i_tcon *tcon)
107 {
108 struct drm_encoder *encoder;
109 struct drm_bridge *bridge;
110 struct sun4i_lvds *lvds;
111 int ret;
112
113 lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL);
114 if (!lvds)
115 return -ENOMEM;
116 lvds->tcon = tcon;
117 encoder = &lvds->encoder;
118
119 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
120 &tcon->panel, &bridge);
121 if (ret) {
122 dev_info(drm->dev, "No panel or bridge found... LVDS output disabled\n");
123 return 0;
124 }
125
126 drm_encoder_helper_add(&lvds->encoder,
127 &sun4i_lvds_enc_helper_funcs);
128 ret = drm_encoder_init(drm,
129 &lvds->encoder,
130 &sun4i_lvds_enc_funcs,
131 DRM_MODE_ENCODER_LVDS,
132 NULL);
133 if (ret) {
134 dev_err(drm->dev, "Couldn't initialise the lvds encoder\n");
135 goto err_out;
136 }
137
138 /* The LVDS encoder can only work with the TCON channel 0 */
139 lvds->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
140
141 if (tcon->panel) {
142 drm_connector_helper_add(&lvds->connector,
143 &sun4i_lvds_con_helper_funcs);
144 ret = drm_connector_init(drm, &lvds->connector,
145 &sun4i_lvds_con_funcs,
146 DRM_MODE_CONNECTOR_LVDS);
147 if (ret) {
148 dev_err(drm->dev, "Couldn't initialise the lvds connector\n");
149 goto err_cleanup_connector;
150 }
151
152 drm_connector_attach_encoder(&lvds->connector,
153 &lvds->encoder);
154
155 ret = drm_panel_attach(tcon->panel, &lvds->connector);
156 if (ret) {
157 dev_err(drm->dev, "Couldn't attach our panel\n");
158 goto err_cleanup_connector;
159 }
160 }
161
162 if (bridge) {
163 ret = drm_bridge_attach(encoder, bridge, NULL);
164 if (ret) {
165 dev_err(drm->dev, "Couldn't attach our bridge\n");
166 goto err_cleanup_connector;
167 }
168 }
169
170 return 0;
171
172 err_cleanup_connector:
173 drm_encoder_cleanup(&lvds->encoder);
174 err_out:
175 return ret;
176 }
177 EXPORT_SYMBOL(sun4i_lvds_init);
178
