xref: /openbmc/linux/drivers/gpu/drm/imx/dcss/dcss-kms.c (revision abe9af53)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright 2019 NXP.
4  */
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 
20 DEFINE_DRM_GEM_CMA_FOPS(dcss_cma_fops);
21 
22 static 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 
29 static struct drm_driver dcss_kms_driver = {
30 	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
31 	.gem_free_object_unlocked = drm_gem_cma_free_object,
32 	.gem_vm_ops		= &drm_gem_cma_vm_ops,
33 	.dumb_create		= drm_gem_cma_dumb_create,
34 
35 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
36 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
37 	.gem_prime_import	= drm_gem_prime_import,
38 	.gem_prime_export	= drm_gem_prime_export,
39 	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
40 	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
41 	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
42 	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
43 	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
44 	.fops			= &dcss_cma_fops,
45 	.name			= "imx-dcss",
46 	.desc			= "i.MX8MQ Display Subsystem",
47 	.date			= "20190917",
48 	.major			= 1,
49 	.minor			= 0,
50 	.patchlevel		= 0,
51 };
52 
53 static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
54 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
55 };
56 
57 static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
58 {
59 	struct drm_mode_config *config = &kms->base.mode_config;
60 
61 	drm_mode_config_init(&kms->base);
62 
63 	config->min_width = 1;
64 	config->min_height = 1;
65 	config->max_width = 4096;
66 	config->max_height = 4096;
67 	config->allow_fb_modifiers = true;
68 	config->normalize_zpos = true;
69 
70 	config->funcs = &dcss_drm_mode_config_funcs;
71 	config->helper_private = &dcss_mode_config_helpers;
72 }
73 
74 static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
75 	.destroy = drm_encoder_cleanup,
76 };
77 
78 static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms)
79 {
80 	struct drm_device *ddev = &kms->base;
81 	struct drm_encoder *encoder = &kms->encoder;
82 	struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc;
83 	struct drm_panel *panel;
84 	struct drm_bridge *bridge;
85 	int ret;
86 
87 	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
88 					  &panel, &bridge);
89 	if (ret)
90 		return ret;
91 
92 	if (!bridge) {
93 		dev_err(ddev->dev, "No bridge found %d.\n", ret);
94 		return -ENODEV;
95 	}
96 
97 	encoder->possible_crtcs = drm_crtc_mask(crtc);
98 
99 	ret = drm_encoder_init(&kms->base, encoder,
100 			       &dcss_kms_simple_encoder_funcs,
101 			       DRM_MODE_ENCODER_NONE, NULL);
102 	if (ret) {
103 		dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret);
104 		return ret;
105 	}
106 
107 	ret = drm_bridge_attach(encoder, bridge, NULL,
108 				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
109 	if (ret < 0) {
110 		dev_err(ddev->dev, "Unable to attach bridge %pOF\n",
111 			bridge->of_node);
112 		return ret;
113 	}
114 
115 	kms->connector = drm_bridge_connector_init(ddev, encoder);
116 	if (IS_ERR(kms->connector)) {
117 		dev_err(ddev->dev, "Unable to create bridge connector.\n");
118 		return PTR_ERR(kms->connector);
119 	}
120 
121 	drm_connector_attach_encoder(kms->connector, encoder);
122 
123 	return 0;
124 }
125 
126 struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
127 {
128 	struct dcss_kms_dev *kms;
129 	struct drm_device *drm;
130 	struct dcss_crtc *crtc;
131 	int ret;
132 
133 	kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver,
134 				 struct dcss_kms_dev, base);
135 	if (IS_ERR(kms))
136 		return kms;
137 
138 	drm = &kms->base;
139 	crtc = &kms->crtc;
140 
141 	drm->dev_private = dcss;
142 
143 	dcss_kms_mode_config_init(kms);
144 
145 	ret = drm_vblank_init(drm, 1);
146 	if (ret)
147 		goto cleanup_mode_config;
148 
149 	drm->irq_enabled = true;
150 
151 	ret = dcss_kms_bridge_connector_init(kms);
152 	if (ret)
153 		goto cleanup_mode_config;
154 
155 	ret = dcss_crtc_init(crtc, drm);
156 	if (ret)
157 		goto cleanup_mode_config;
158 
159 	drm_mode_config_reset(drm);
160 
161 	drm_kms_helper_poll_init(drm);
162 
163 	drm_bridge_connector_enable_hpd(kms->connector);
164 
165 	ret = drm_dev_register(drm, 0);
166 	if (ret)
167 		goto cleanup_crtc;
168 
169 	drm_fbdev_generic_setup(drm, 32);
170 
171 	return kms;
172 
173 cleanup_crtc:
174 	drm_bridge_connector_disable_hpd(kms->connector);
175 	drm_kms_helper_poll_fini(drm);
176 	dcss_crtc_deinit(crtc, drm);
177 
178 cleanup_mode_config:
179 	drm_mode_config_cleanup(drm);
180 	drm->dev_private = NULL;
181 
182 	return ERR_PTR(ret);
183 }
184 
185 void dcss_kms_detach(struct dcss_kms_dev *kms)
186 {
187 	struct drm_device *drm = &kms->base;
188 
189 	drm_dev_unregister(drm);
190 	drm_bridge_connector_disable_hpd(kms->connector);
191 	drm_kms_helper_poll_fini(drm);
192 	drm_atomic_helper_shutdown(drm);
193 	drm_crtc_vblank_off(&kms->crtc.base);
194 	drm->irq_enabled = false;
195 	drm_mode_config_cleanup(drm);
196 	dcss_crtc_deinit(&kms->crtc, drm);
197 	drm->dev_private = NULL;
198 }
199