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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
18static 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
31static 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
43static
44struct 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
60int 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
87static
88int 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
111int 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
153err_encoder_cleanup:
154 drm_encoder_cleanup(priv->external_encoder);
155 return ret;
156}
157
158static int dev_match_of(struct device *dev, void *data)
159{
160 return dev->of_node == data;
161}
162
163int 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}
1/*
2 * Copyright (C) 2015 Texas Instruments
3 * Author: Jyri Sarha <jsarha@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 */
10
11#include <linux/component.h>
12#include <linux/of_graph.h>
13#include <drm/drm_of.h>
14
15#include "tilcdc_drv.h"
16#include "tilcdc_external.h"
17
18static 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
31static 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
43static int tilcdc_external_mode_valid(struct drm_connector *connector,
44 struct drm_display_mode *mode)
45{
46 struct tilcdc_drm_private *priv = connector->dev->dev_private;
47 int ret;
48
49 ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
50 if (ret != MODE_OK)
51 return ret;
52
53 BUG_ON(priv->external_connector != connector);
54 BUG_ON(!priv->connector_funcs);
55
56 /* If the connector has its own mode_valid call it. */
57 if (!IS_ERR(priv->connector_funcs) &&
58 priv->connector_funcs->mode_valid)
59 return priv->connector_funcs->mode_valid(connector, mode);
60
61 return MODE_OK;
62}
63
64static int tilcdc_add_external_connector(struct drm_device *dev,
65 struct drm_connector *connector)
66{
67 struct tilcdc_drm_private *priv = dev->dev_private;
68 struct drm_connector_helper_funcs *connector_funcs;
69
70 /* There should never be more than one connector */
71 if (WARN_ON(priv->external_connector))
72 return -EINVAL;
73
74 priv->external_connector = connector;
75 connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
76 GFP_KERNEL);
77 if (!connector_funcs)
78 return -ENOMEM;
79
80 /* connector->helper_private contains always struct
81 * connector_helper_funcs pointer. For tilcdc crtc to have a
82 * say if a specific mode is Ok, we need to install our own
83 * helper functions. In our helper functions we copy
84 * everything else but use our own mode_valid() (above).
85 */
86 if (connector->helper_private) {
87 priv->connector_funcs = connector->helper_private;
88 *connector_funcs = *priv->connector_funcs;
89 } else {
90 priv->connector_funcs = ERR_PTR(-ENOENT);
91 }
92 connector_funcs->mode_valid = tilcdc_external_mode_valid;
93 drm_connector_helper_add(connector, connector_funcs);
94
95 dev_dbg(dev->dev, "External connector '%s' connected\n",
96 connector->name);
97
98 return 0;
99}
100
101static
102struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
103 struct drm_encoder *encoder)
104{
105 struct drm_connector *connector;
106 int i;
107
108 list_for_each_entry(connector, &ddev->mode_config.connector_list, head)
109 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
110 if (connector->encoder_ids[i] == encoder->base.id)
111 return connector;
112
113 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
114 encoder->name, encoder->base.id);
115
116 return NULL;
117}
118
119int tilcdc_add_component_encoder(struct drm_device *ddev)
120{
121 struct tilcdc_drm_private *priv = ddev->dev_private;
122 struct drm_connector *connector;
123 struct drm_encoder *encoder;
124
125 list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
126 if (encoder->possible_crtcs & (1 << priv->crtc->index))
127 break;
128
129 if (!encoder) {
130 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
131 return -ENODEV;
132 }
133
134 connector = tilcdc_encoder_find_connector(ddev, encoder);
135
136 if (!connector)
137 return -ENODEV;
138
139 /* Only tda998x is supported at the moment. */
140 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
141 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
142
143 return tilcdc_add_external_connector(ddev, connector);
144}
145
146void tilcdc_remove_external_device(struct drm_device *dev)
147{
148 struct tilcdc_drm_private *priv = dev->dev_private;
149
150 /* Restore the original helper functions, if any. */
151 if (IS_ERR(priv->connector_funcs))
152 drm_connector_helper_add(priv->external_connector, NULL);
153 else if (priv->connector_funcs)
154 drm_connector_helper_add(priv->external_connector,
155 priv->connector_funcs);
156}
157
158static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
159 .destroy = drm_encoder_cleanup,
160};
161
162static
163int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
164{
165 struct tilcdc_drm_private *priv = ddev->dev_private;
166 struct drm_connector *connector;
167 int ret;
168
169 priv->external_encoder->possible_crtcs = BIT(0);
170
171 ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
172 if (ret) {
173 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
174 return ret;
175 }
176
177 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
178
179 connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
180 if (!connector)
181 return -ENODEV;
182
183 ret = tilcdc_add_external_connector(ddev, connector);
184
185 return ret;
186}
187
188int tilcdc_attach_external_device(struct drm_device *ddev)
189{
190 struct tilcdc_drm_private *priv = ddev->dev_private;
191 struct drm_bridge *bridge;
192 struct drm_panel *panel;
193 int ret;
194
195 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
196 &panel, &bridge);
197 if (ret == -ENODEV)
198 return 0;
199 else if (ret)
200 return ret;
201
202 priv->external_encoder = devm_kzalloc(ddev->dev,
203 sizeof(*priv->external_encoder),
204 GFP_KERNEL);
205 if (!priv->external_encoder)
206 return -ENOMEM;
207
208 ret = drm_encoder_init(ddev, priv->external_encoder,
209 &tilcdc_external_encoder_funcs,
210 DRM_MODE_ENCODER_NONE, NULL);
211 if (ret) {
212 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
213 return ret;
214 }
215
216 if (panel) {
217 bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
218 DRM_MODE_CONNECTOR_DPI);
219 if (IS_ERR(bridge)) {
220 ret = PTR_ERR(bridge);
221 goto err_encoder_cleanup;
222 }
223 }
224
225 ret = tilcdc_attach_bridge(ddev, bridge);
226 if (ret)
227 goto err_encoder_cleanup;
228
229 return 0;
230
231err_encoder_cleanup:
232 drm_encoder_cleanup(priv->external_encoder);
233 return ret;
234}
235
236static int dev_match_of(struct device *dev, void *data)
237{
238 return dev->of_node == data;
239}
240
241int tilcdc_get_external_components(struct device *dev,
242 struct component_match **match)
243{
244 struct device_node *node;
245
246 node = of_graph_get_remote_node(dev->of_node, 0, 0);
247
248 if (!of_device_is_compatible(node, "nxp,tda998x")) {
249 of_node_put(node);
250 return 0;
251 }
252
253 if (match)
254 drm_of_component_match_add(dev, match, dev_match_of, node);
255 of_node_put(node);
256 return 1;
257}