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 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
98 return ret;
99 }
100
101 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
102
103 priv->external_connector =
104 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
105 if (!priv->external_connector)
106 return -ENODEV;
107
108 return 0;
109 }
110
tilcdc_attach_external_device(struct drm_device * ddev)111 int tilcdc_attach_external_device(struct drm_device *ddev)
112 {
113 struct tilcdc_drm_private *priv = ddev->dev_private;
114 struct drm_bridge *bridge;
115 struct drm_panel *panel;
116 int ret;
117
118 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
119 &panel, &bridge);
120 if (ret == -ENODEV)
121 return 0;
122 else if (ret)
123 return ret;
124
125 priv->external_encoder = devm_kzalloc(ddev->dev,
126 sizeof(*priv->external_encoder),
127 GFP_KERNEL);
128 if (!priv->external_encoder)
129 return -ENOMEM;
130
131 ret = drm_simple_encoder_init(ddev, priv->external_encoder,
132 DRM_MODE_ENCODER_NONE);
133 if (ret) {
134 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
135 return ret;
136 }
137
138 if (panel) {
139 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
140 DRM_MODE_CONNECTOR_DPI);
141 if (IS_ERR(bridge)) {
142 ret = PTR_ERR(bridge);
143 goto err_encoder_cleanup;
144 }
145 }
146
147 ret = tilcdc_attach_bridge(ddev, bridge);
148 if (ret)
149 goto err_encoder_cleanup;
150
151 return 0;
152
153 err_encoder_cleanup:
154 drm_encoder_cleanup(priv->external_encoder);
155 return ret;
156 }
157
dev_match_of(struct device * dev,void * data)158 static int dev_match_of(struct device *dev, void *data)
159 {
160 return dev->of_node == data;
161 }
162
tilcdc_get_external_components(struct device * dev,struct component_match ** match)163 int tilcdc_get_external_components(struct device *dev,
164 struct component_match **match)
165 {
166 struct device_node *node;
167
168 node = of_graph_get_remote_node(dev->of_node, 0, 0);
169
170 if (!of_device_is_compatible(node, "nxp,tda998x")) {
171 of_node_put(node);
172 return 0;
173 }
174
175 if (match)
176 drm_of_component_match_add(dev, match, dev_match_of, node);
177 of_node_put(node);
178 return 1;
179 }
180