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7#include <linux/component.h>
8#include <linux/of_graph.h>
9#include <drm/drm_atomic_helper.h>
10#include <drm/drm_of.h>
11
12#include "tilcdc_drv.h"
13#include "tilcdc_external.h"
14
15static const struct tilcdc_panel_info panel_info_tda998x = {
16 .ac_bias = 255,
17 .ac_bias_intrpt = 0,
18 .dma_burst_sz = 16,
19 .bpp = 16,
20 .fdd = 0x80,
21 .tft_alt_mode = 0,
22 .invert_pxl_clk = 1,
23 .sync_edge = 1,
24 .sync_ctrl = 1,
25 .raster_order = 0,
26};
27
28static const struct tilcdc_panel_info panel_info_default = {
29 .ac_bias = 255,
30 .ac_bias_intrpt = 0,
31 .dma_burst_sz = 16,
32 .bpp = 16,
33 .fdd = 0x80,
34 .tft_alt_mode = 0,
35 .sync_edge = 0,
36 .sync_ctrl = 1,
37 .raster_order = 0,
38};
39
40static int tilcdc_external_mode_valid(struct drm_connector *connector,
41 struct drm_display_mode *mode)
42{
43 struct tilcdc_drm_private *priv = connector->dev->dev_private;
44 int ret;
45
46 ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
47 if (ret != MODE_OK)
48 return ret;
49
50 BUG_ON(priv->external_connector != connector);
51 BUG_ON(!priv->connector_funcs);
52
53
54 if (!IS_ERR(priv->connector_funcs) &&
55 priv->connector_funcs->mode_valid)
56 return priv->connector_funcs->mode_valid(connector, mode);
57
58 return MODE_OK;
59}
60
61static int tilcdc_add_external_connector(struct drm_device *dev,
62 struct drm_connector *connector)
63{
64 struct tilcdc_drm_private *priv = dev->dev_private;
65 struct drm_connector_helper_funcs *connector_funcs;
66
67
68 if (WARN_ON(priv->external_connector))
69 return -EINVAL;
70
71 priv->external_connector = connector;
72 connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
73 GFP_KERNEL);
74 if (!connector_funcs)
75 return -ENOMEM;
76
77
78
79
80
81
82
83 if (connector->helper_private) {
84 priv->connector_funcs = connector->helper_private;
85 *connector_funcs = *priv->connector_funcs;
86 } else {
87 priv->connector_funcs = ERR_PTR(-ENOENT);
88 }
89 connector_funcs->mode_valid = tilcdc_external_mode_valid;
90 drm_connector_helper_add(connector, connector_funcs);
91
92 dev_dbg(dev->dev, "External connector '%s' connected\n",
93 connector->name);
94
95 return 0;
96}
97
98static
99struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
100 struct drm_encoder *encoder)
101{
102 struct drm_connector *connector;
103
104 list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
105 if (drm_connector_has_possible_encoder(connector, encoder))
106 return connector;
107 }
108
109 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
110 encoder->name, encoder->base.id);
111
112 return NULL;
113}
114
115int tilcdc_add_component_encoder(struct drm_device *ddev)
116{
117 struct tilcdc_drm_private *priv = ddev->dev_private;
118 struct drm_connector *connector;
119 struct drm_encoder *encoder;
120
121 list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
122 if (encoder->possible_crtcs & (1 << priv->crtc->index))
123 break;
124
125 if (!encoder) {
126 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
127 return -ENODEV;
128 }
129
130 connector = tilcdc_encoder_find_connector(ddev, encoder);
131
132 if (!connector)
133 return -ENODEV;
134
135
136 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
137 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
138
139 return tilcdc_add_external_connector(ddev, connector);
140}
141
142void tilcdc_remove_external_device(struct drm_device *dev)
143{
144 struct tilcdc_drm_private *priv = dev->dev_private;
145
146
147 if (IS_ERR(priv->connector_funcs))
148 drm_connector_helper_add(priv->external_connector, NULL);
149 else if (priv->connector_funcs)
150 drm_connector_helper_add(priv->external_connector,
151 priv->connector_funcs);
152}
153
154static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
155 .destroy = drm_encoder_cleanup,
156};
157
158static
159int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
160{
161 struct tilcdc_drm_private *priv = ddev->dev_private;
162 struct drm_connector *connector;
163 int ret;
164
165 priv->external_encoder->possible_crtcs = BIT(0);
166
167 ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
168 if (ret) {
169 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
170 return ret;
171 }
172
173 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
174
175 connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
176 if (!connector)
177 return -ENODEV;
178
179 ret = tilcdc_add_external_connector(ddev, connector);
180
181 return ret;
182}
183
184int tilcdc_attach_external_device(struct drm_device *ddev)
185{
186 struct tilcdc_drm_private *priv = ddev->dev_private;
187 struct drm_bridge *bridge;
188 struct drm_panel *panel;
189 int ret;
190
191 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
192 &panel, &bridge);
193 if (ret == -ENODEV)
194 return 0;
195 else if (ret)
196 return ret;
197
198 priv->external_encoder = devm_kzalloc(ddev->dev,
199 sizeof(*priv->external_encoder),
200 GFP_KERNEL);
201 if (!priv->external_encoder)
202 return -ENOMEM;
203
204 ret = drm_encoder_init(ddev, priv->external_encoder,
205 &tilcdc_external_encoder_funcs,
206 DRM_MODE_ENCODER_NONE, NULL);
207 if (ret) {
208 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
209 return ret;
210 }
211
212 if (panel) {
213 bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
214 DRM_MODE_CONNECTOR_DPI);
215 if (IS_ERR(bridge)) {
216 ret = PTR_ERR(bridge);
217 goto err_encoder_cleanup;
218 }
219 }
220
221 ret = tilcdc_attach_bridge(ddev, bridge);
222 if (ret)
223 goto err_encoder_cleanup;
224
225 return 0;
226
227err_encoder_cleanup:
228 drm_encoder_cleanup(priv->external_encoder);
229 return ret;
230}
231
232static int dev_match_of(struct device *dev, void *data)
233{
234 return dev->of_node == data;
235}
236
237int tilcdc_get_external_components(struct device *dev,
238 struct component_match **match)
239{
240 struct device_node *node;
241
242 node = of_graph_get_remote_node(dev->of_node, 0, 0);
243
244 if (!of_device_is_compatible(node, "nxp,tda998x")) {
245 of_node_put(node);
246 return 0;
247 }
248
249 if (match)
250 drm_of_component_match_add(dev, match, dev_match_of, node);
251 of_node_put(node);
252 return 1;
253}
254