1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015 Texas Instruments
4 * Author: Jyri Sarha <jsarha@ti.com>
5 */
6
7 #include <linux/component.h>
8 #include <linux/of_graph.h>
9
10 #include <drm/drm_atomic_helper.h>
11 #include <drm/drm_bridge.h>
12 #include <drm/drm_of.h>
13 #include <drm/drm_simple_kms_helper.h>
14
15 #include "tilcdc_drv.h"
16 #include "tilcdc_external.h"
17
18 static const struct tilcdc_panel_info panel_info_tda998x = {
19 .ac_bias = 255,
20 .ac_bias_intrpt = 0,
21 .dma_burst_sz = 16,
22 .bpp = 16,
23 .fdd = 0x80,
24 .tft_alt_mode = 0,
25 .invert_pxl_clk = 1,
26 .sync_edge = 1,
27 .sync_ctrl = 1,
28 .raster_order = 0,
29 };
30
31 static const struct tilcdc_panel_info panel_info_default = {
32 .ac_bias = 255,
33 .ac_bias_intrpt = 0,
34 .dma_burst_sz = 16,
35 .bpp = 16,
36 .fdd = 0x80,
37 .tft_alt_mode = 0,
38 .sync_edge = 0,
39 .sync_ctrl = 1,
40 .raster_order = 0,
41 };
42
43 static
tilcdc_encoder_find_connector(struct drm_device * ddev,struct drm_encoder * encoder)44 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
45 struct drm_encoder *encoder)
46 {
47 struct drm_connector *connector;
48
49 list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
50 if (drm_connector_has_possible_encoder(connector, encoder))
51 return connector;
52 }
53
54 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
55 encoder->name, encoder->base.id);
56
57 return NULL;
58 }
59
tilcdc_add_component_encoder(struct drm_device * ddev)60 int tilcdc_add_component_encoder(struct drm_device *ddev)
61 {
62 struct tilcdc_drm_private *priv = ddev->dev_private;
63 struct drm_encoder *encoder;
64
65 list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
66 if (encoder->possible_crtcs & (1 << priv->crtc->index))
67 break;
68
69 if (!encoder) {
70 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
71 return -ENODEV;
72 }
73
74 priv->external_connector =
75 tilcdc_encoder_find_connector(ddev, encoder);
76
77 if (!priv->external_connector)
78 return -ENODEV;
79
80 /* Only tda998x is supported at the moment. */
81 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
82 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
83
84 return 0;
85 }
86
87 static
tilcdc_attach_bridge(struct drm_device * ddev,struct drm_bridge * bridge)88 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
89 {
90 struct tilcdc_drm_private *priv = ddev->dev_private;
91 int ret;
92
93 priv->external_encoder->possible_crtcs = BIT(0);
94
95 ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0);
96 if (ret)
97 return ret;
98
99 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
100
101 priv->external_connector =
102 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
103 if (!priv->external_connector)
104 return -ENODEV;
105
106 return 0;
107 }
108
tilcdc_attach_external_device(struct drm_device * ddev)109 int tilcdc_attach_external_device(struct drm_device *ddev)
110 {
111 struct tilcdc_drm_private *priv = ddev->dev_private;
112 struct drm_bridge *bridge;
113 struct drm_panel *panel;
114 int ret;
115
116 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
117 &panel, &bridge);
118 if (ret == -ENODEV)
119 return 0;
120 else if (ret)
121 return ret;
122
123 priv->external_encoder = devm_kzalloc(ddev->dev,
124 sizeof(*priv->external_encoder),
125 GFP_KERNEL);
126 if (!priv->external_encoder)
127 return -ENOMEM;
128
129 ret = drm_simple_encoder_init(ddev, priv->external_encoder,
130 DRM_MODE_ENCODER_NONE);
131 if (ret) {
132 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
133 return ret;
134 }
135
136 if (panel) {
137 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
138 DRM_MODE_CONNECTOR_DPI);
139 if (IS_ERR(bridge)) {
140 ret = PTR_ERR(bridge);
141 goto err_encoder_cleanup;
142 }
143 }
144
145 ret = tilcdc_attach_bridge(ddev, bridge);
146 if (ret)
147 goto err_encoder_cleanup;
148
149 return 0;
150
151 err_encoder_cleanup:
152 drm_encoder_cleanup(priv->external_encoder);
153 return ret;
154 }
155
dev_match_of(struct device * dev,void * data)156 static int dev_match_of(struct device *dev, void *data)
157 {
158 return dev->of_node == data;
159 }
160
tilcdc_get_external_components(struct device * dev,struct component_match ** match)161 int tilcdc_get_external_components(struct device *dev,
162 struct component_match **match)
163 {
164 struct device_node *node;
165
166 node = of_graph_get_remote_node(dev->of_node, 0, 0);
167
168 if (!of_device_is_compatible(node, "nxp,tda998x")) {
169 of_node_put(node);
170 return 0;
171 }
172
173 if (match)
174 drm_of_component_match_add(dev, match, dev_match_of, node);
175 of_node_put(node);
176 return 1;
177 }
178
