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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
14#include "tilcdc_drv.h"
15#include "tilcdc_external.h"
16
17static const struct tilcdc_panel_info panel_info_tda998x = {
18 .ac_bias = 255,
19 .ac_bias_intrpt = 0,
20 .dma_burst_sz = 16,
21 .bpp = 16,
22 .fdd = 0x80,
23 .tft_alt_mode = 0,
24 .invert_pxl_clk = 1,
25 .sync_edge = 1,
26 .sync_ctrl = 1,
27 .raster_order = 0,
28};
29
30static int tilcdc_external_mode_valid(struct drm_connector *connector,
31 struct drm_display_mode *mode)
32{
33 struct tilcdc_drm_private *priv = connector->dev->dev_private;
34 int ret, i;
35
36 ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
37 if (ret != MODE_OK)
38 return ret;
39
40 for (i = 0; i < priv->num_connectors &&
41 priv->connectors[i] != connector; i++)
42 ;
43
44 BUG_ON(priv->connectors[i] != connector);
45 BUG_ON(!priv->connector_funcs[i]);
46
47 /* If the connector has its own mode_valid call it. */
48 if (!IS_ERR(priv->connector_funcs[i]) &&
49 priv->connector_funcs[i]->mode_valid)
50 return priv->connector_funcs[i]->mode_valid(connector, mode);
51
52 return MODE_OK;
53}
54
55static int tilcdc_add_external_encoder(struct drm_device *dev, int *bpp,
56 struct drm_connector *connector)
57{
58 struct tilcdc_drm_private *priv = dev->dev_private;
59 struct drm_connector_helper_funcs *connector_funcs;
60
61 priv->connectors[priv->num_connectors] = connector;
62 priv->encoders[priv->num_encoders++] = connector->encoder;
63
64 /* Only tda998x is supported at the moment. */
65 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
66 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
67 *bpp = panel_info_tda998x.bpp;
68
69 connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
70 GFP_KERNEL);
71 if (!connector_funcs)
72 return -ENOMEM;
73
74 /* connector->helper_private contains always struct
75 * connector_helper_funcs pointer. For tilcdc crtc to have a
76 * say if a specific mode is Ok, we need to install our own
77 * helper functions. In our helper functions we copy
78 * everything else but use our own mode_valid() (above).
79 */
80 if (connector->helper_private) {
81 priv->connector_funcs[priv->num_connectors] =
82 connector->helper_private;
83 *connector_funcs = *priv->connector_funcs[priv->num_connectors];
84 } else {
85 priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT);
86 }
87 connector_funcs->mode_valid = tilcdc_external_mode_valid;
88 drm_connector_helper_add(connector, connector_funcs);
89 priv->num_connectors++;
90
91 dev_dbg(dev->dev, "External encoder '%s' connected\n",
92 connector->encoder->name);
93
94 return 0;
95}
96
97int tilcdc_add_external_encoders(struct drm_device *dev, int *bpp)
98{
99 struct tilcdc_drm_private *priv = dev->dev_private;
100 struct drm_connector *connector;
101 int num_internal_connectors = priv->num_connectors;
102
103 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
104 bool found = false;
105 int i, ret;
106
107 for (i = 0; i < num_internal_connectors; i++)
108 if (connector == priv->connectors[i])
109 found = true;
110 if (!found) {
111 ret = tilcdc_add_external_encoder(dev, bpp, connector);
112 if (ret)
113 return ret;
114 }
115 }
116 return 0;
117}
118
119void tilcdc_remove_external_encoders(struct drm_device *dev)
120{
121 struct tilcdc_drm_private *priv = dev->dev_private;
122 int i;
123
124 /* Restore the original helper functions, if any. */
125 for (i = 0; i < priv->num_connectors; i++)
126 if (IS_ERR(priv->connector_funcs[i]))
127 drm_connector_helper_add(priv->connectors[i], NULL);
128 else if (priv->connector_funcs[i])
129 drm_connector_helper_add(priv->connectors[i],
130 priv->connector_funcs[i]);
131}
132
133static int dev_match_of(struct device *dev, void *data)
134{
135 return dev->of_node == data;
136}
137
138int tilcdc_get_external_components(struct device *dev,
139 struct component_match **match)
140{
141 struct device_node *ep = NULL;
142 int count = 0;
143
144 while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
145 struct device_node *node;
146
147 node = of_graph_get_remote_port_parent(ep);
148 if (!node && !of_device_is_available(node)) {
149 of_node_put(node);
150 continue;
151 }
152
153 dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
154 if (match)
155 component_match_add(dev, match, dev_match_of, node);
156 of_node_put(node);
157 count++;
158 }
159
160 if (count > 1) {
161 dev_err(dev, "Only one external encoder is supported\n");
162 return -EINVAL;
163 }
164
165 return count;
166}
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_of.h>
12
13#include "tilcdc_drv.h"
14#include "tilcdc_external.h"
15
16static 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
29static 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
41static
42struct 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
58int 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 /* Only tda998x is supported at the moment. */
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
85static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
86 .destroy = drm_encoder_cleanup,
87};
88
89static
90int 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
113int 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
156err_encoder_cleanup:
157 drm_encoder_cleanup(priv->external_encoder);
158 return ret;
159}
160
161static int dev_match_of(struct device *dev, void *data)
162{
163 return dev->of_node == data;
164}
165
166int 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}