This source file includes following definitions.
- tilcdc_encoder_find_connector
- tilcdc_add_component_encoder
- tilcdc_attach_bridge
- tilcdc_attach_external_device
- dev_match_of
- tilcdc_get_external_components
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6
7 #include <linux/component.h>
8 #include <linux/of_graph.h>
9
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_of.h>
12
13 #include "tilcdc_drv.h"
14 #include "tilcdc_external.h"
15
16 static const struct tilcdc_panel_info panel_info_tda998x = {
17 .ac_bias = 255,
18 .ac_bias_intrpt = 0,
19 .dma_burst_sz = 16,
20 .bpp = 16,
21 .fdd = 0x80,
22 .tft_alt_mode = 0,
23 .invert_pxl_clk = 1,
24 .sync_edge = 1,
25 .sync_ctrl = 1,
26 .raster_order = 0,
27 };
28
29 static const struct tilcdc_panel_info panel_info_default = {
30 .ac_bias = 255,
31 .ac_bias_intrpt = 0,
32 .dma_burst_sz = 16,
33 .bpp = 16,
34 .fdd = 0x80,
35 .tft_alt_mode = 0,
36 .sync_edge = 0,
37 .sync_ctrl = 1,
38 .raster_order = 0,
39 };
40
41 static
42 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
43 struct drm_encoder *encoder)
44 {
45 struct drm_connector *connector;
46
47 list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
48 if (drm_connector_has_possible_encoder(connector, encoder))
49 return connector;
50 }
51
52 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
53 encoder->name, encoder->base.id);
54
55 return NULL;
56 }
57
58 int tilcdc_add_component_encoder(struct drm_device *ddev)
59 {
60 struct tilcdc_drm_private *priv = ddev->dev_private;
61 struct drm_encoder *encoder;
62
63 list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
64 if (encoder->possible_crtcs & (1 << priv->crtc->index))
65 break;
66
67 if (!encoder) {
68 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
69 return -ENODEV;
70 }
71
72 priv->external_connector =
73 tilcdc_encoder_find_connector(ddev, encoder);
74
75 if (!priv->external_connector)
76 return -ENODEV;
77
78
79 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
80 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
81
82 return 0;
83 }
84
85 static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
86 .destroy = drm_encoder_cleanup,
87 };
88
89 static
90 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
91 {
92 struct tilcdc_drm_private *priv = ddev->dev_private;
93 int ret;
94
95 priv->external_encoder->possible_crtcs = BIT(0);
96
97 ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
98 if (ret) {
99 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
100 return ret;
101 }
102
103 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
104
105 priv->external_connector =
106 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
107 if (!priv->external_connector)
108 return -ENODEV;
109
110 return 0;
111 }
112
113 int tilcdc_attach_external_device(struct drm_device *ddev)
114 {
115 struct tilcdc_drm_private *priv = ddev->dev_private;
116 struct drm_bridge *bridge;
117 struct drm_panel *panel;
118 int ret;
119
120 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
121 &panel, &bridge);
122 if (ret == -ENODEV)
123 return 0;
124 else if (ret)
125 return ret;
126
127 priv->external_encoder = devm_kzalloc(ddev->dev,
128 sizeof(*priv->external_encoder),
129 GFP_KERNEL);
130 if (!priv->external_encoder)
131 return -ENOMEM;
132
133 ret = drm_encoder_init(ddev, priv->external_encoder,
134 &tilcdc_external_encoder_funcs,
135 DRM_MODE_ENCODER_NONE, NULL);
136 if (ret) {
137 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
138 return ret;
139 }
140
141 if (panel) {
142 bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
143 DRM_MODE_CONNECTOR_DPI);
144 if (IS_ERR(bridge)) {
145 ret = PTR_ERR(bridge);
146 goto err_encoder_cleanup;
147 }
148 }
149
150 ret = tilcdc_attach_bridge(ddev, bridge);
151 if (ret)
152 goto err_encoder_cleanup;
153
154 return 0;
155
156 err_encoder_cleanup:
157 drm_encoder_cleanup(priv->external_encoder);
158 return ret;
159 }
160
161 static int dev_match_of(struct device *dev, void *data)
162 {
163 return dev->of_node == data;
164 }
165
166 int tilcdc_get_external_components(struct device *dev,
167 struct component_match **match)
168 {
169 struct device_node *node;
170
171 node = of_graph_get_remote_node(dev->of_node, 0, 0);
172
173 if (!of_device_is_compatible(node, "nxp,tda998x")) {
174 of_node_put(node);
175 return 0;
176 }
177
178 if (match)
179 drm_of_component_match_add(dev, match, dev_match_of, node);
180 of_node_put(node);
181 return 1;
182 }