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5
6#include <drm/drm_atomic.h>
7#include <drm/drm_atomic_helper.h>
8#include <drm/drm_bridge_connector.h>
9#include <drm/drm_drv.h>
10#include <drm/drm_fb_helper.h>
11#include <drm/drm_gem_cma_helper.h>
12#include <drm/drm_gem_framebuffer_helper.h>
13#include <drm/drm_of.h>
14#include <drm/drm_probe_helper.h>
15#include <drm/drm_vblank.h>
16
17#include "dcss-dev.h"
18#include "dcss-kms.h"
19
20DEFINE_DRM_GEM_CMA_FOPS(dcss_cma_fops);
21
22static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = {
23 .fb_create = drm_gem_fb_create,
24 .output_poll_changed = drm_fb_helper_output_poll_changed,
25 .atomic_check = drm_atomic_helper_check,
26 .atomic_commit = drm_atomic_helper_commit,
27};
28
29static const struct drm_driver dcss_kms_driver = {
30 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
31 DRM_GEM_CMA_DRIVER_OPS,
32 .fops = &dcss_cma_fops,
33 .name = "imx-dcss",
34 .desc = "i.MX8MQ Display Subsystem",
35 .date = "20190917",
36 .major = 1,
37 .minor = 0,
38 .patchlevel = 0,
39};
40
41static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
42 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
43};
44
45static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
46{
47 struct drm_mode_config *config = &kms->base.mode_config;
48
49 drm_mode_config_init(&kms->base);
50
51 config->min_width = 1;
52 config->min_height = 1;
53 config->max_width = 4096;
54 config->max_height = 4096;
55 config->allow_fb_modifiers = true;
56 config->normalize_zpos = true;
57
58 config->funcs = &dcss_drm_mode_config_funcs;
59 config->helper_private = &dcss_mode_config_helpers;
60}
61
62static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
63 .destroy = drm_encoder_cleanup,
64};
65
66static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms)
67{
68 struct drm_device *ddev = &kms->base;
69 struct drm_encoder *encoder = &kms->encoder;
70 struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc;
71 struct drm_panel *panel;
72 struct drm_bridge *bridge;
73 int ret;
74
75 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
76 &panel, &bridge);
77 if (ret)
78 return ret;
79
80 if (!bridge) {
81 dev_err(ddev->dev, "No bridge found %d.\n", ret);
82 return -ENODEV;
83 }
84
85 encoder->possible_crtcs = drm_crtc_mask(crtc);
86
87 ret = drm_encoder_init(&kms->base, encoder,
88 &dcss_kms_simple_encoder_funcs,
89 DRM_MODE_ENCODER_NONE, NULL);
90 if (ret) {
91 dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret);
92 return ret;
93 }
94
95 ret = drm_bridge_attach(encoder, bridge, NULL,
96 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
97 if (ret < 0) {
98 dev_err(ddev->dev, "Unable to attach bridge %pOF\n",
99 bridge->of_node);
100 return ret;
101 }
102
103 kms->connector = drm_bridge_connector_init(ddev, encoder);
104 if (IS_ERR(kms->connector)) {
105 dev_err(ddev->dev, "Unable to create bridge connector.\n");
106 return PTR_ERR(kms->connector);
107 }
108
109 drm_connector_attach_encoder(kms->connector, encoder);
110
111 return 0;
112}
113
114struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
115{
116 struct dcss_kms_dev *kms;
117 struct drm_device *drm;
118 struct dcss_crtc *crtc;
119 int ret;
120
121 kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver,
122 struct dcss_kms_dev, base);
123 if (IS_ERR(kms))
124 return kms;
125
126 drm = &kms->base;
127 crtc = &kms->crtc;
128
129 drm->dev_private = dcss;
130
131 dcss_kms_mode_config_init(kms);
132
133 ret = drm_vblank_init(drm, 1);
134 if (ret)
135 goto cleanup_mode_config;
136
137 drm->irq_enabled = true;
138
139 ret = dcss_kms_bridge_connector_init(kms);
140 if (ret)
141 goto cleanup_mode_config;
142
143 ret = dcss_crtc_init(crtc, drm);
144 if (ret)
145 goto cleanup_mode_config;
146
147 drm_mode_config_reset(drm);
148
149 drm_kms_helper_poll_init(drm);
150
151 drm_bridge_connector_enable_hpd(kms->connector);
152
153 ret = drm_dev_register(drm, 0);
154 if (ret)
155 goto cleanup_crtc;
156
157 drm_fbdev_generic_setup(drm, 32);
158
159 return kms;
160
161cleanup_crtc:
162 drm_bridge_connector_disable_hpd(kms->connector);
163 drm_kms_helper_poll_fini(drm);
164 dcss_crtc_deinit(crtc, drm);
165
166cleanup_mode_config:
167 drm_mode_config_cleanup(drm);
168 drm->dev_private = NULL;
169
170 return ERR_PTR(ret);
171}
172
173void dcss_kms_detach(struct dcss_kms_dev *kms)
174{
175 struct drm_device *drm = &kms->base;
176
177 drm_dev_unregister(drm);
178 drm_bridge_connector_disable_hpd(kms->connector);
179 drm_kms_helper_poll_fini(drm);
180 drm_atomic_helper_shutdown(drm);
181 drm_crtc_vblank_off(&kms->crtc.base);
182 drm->irq_enabled = false;
183 drm_mode_config_cleanup(drm);
184 dcss_crtc_deinit(&kms->crtc, drm);
185 drm->dev_private = NULL;
186}
187
