2 * Copyright (C) 2015 Texas Instruments
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.
11 #include <linux/component.h>
12 #include <linux/of_graph.h>
14 #include "tilcdc_drv.h"
15 #include "tilcdc_external.h"
17 static const struct tilcdc_panel_info panel_info_tda998x = {
30 static int tilcdc_external_mode_valid(struct drm_connector *connector,
31 struct drm_display_mode *mode)
33 struct tilcdc_drm_private *priv = connector->dev->dev_private;
36 ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
40 for (i = 0; i < priv->num_connectors &&
41 priv->connectors[i] != connector; i++)
44 BUG_ON(priv->connectors[i] != connector);
45 BUG_ON(!priv->connector_funcs[i]);
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);
55 static int tilcdc_add_external_encoder(struct drm_device *dev, int *bpp,
56 struct drm_connector *connector)
58 struct tilcdc_drm_private *priv = dev->dev_private;
59 struct drm_connector_helper_funcs *connector_funcs;
61 priv->connectors[priv->num_connectors] = connector;
62 priv->encoders[priv->num_encoders++] = connector->encoder;
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;
69 connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
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).
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];
85 priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT);
87 connector_funcs->mode_valid = tilcdc_external_mode_valid;
88 drm_connector_helper_add(connector, connector_funcs);
89 priv->num_connectors++;
91 dev_dbg(dev->dev, "External encoder '%s' connected\n",
92 connector->encoder->name);
97 int tilcdc_add_external_encoders(struct drm_device *dev, int *bpp)
99 struct tilcdc_drm_private *priv = dev->dev_private;
100 struct drm_connector *connector;
101 int num_internal_connectors = priv->num_connectors;
103 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
107 for (i = 0; i < num_internal_connectors; i++)
108 if (connector == priv->connectors[i])
111 ret = tilcdc_add_external_encoder(dev, bpp, connector);
119 void tilcdc_remove_external_encoders(struct drm_device *dev)
121 struct tilcdc_drm_private *priv = dev->dev_private;
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]);
133 static int dev_match_of(struct device *dev, void *data)
135 return dev->of_node == data;
138 int tilcdc_get_external_components(struct device *dev,
139 struct component_match **match)
141 struct device_node *node;
142 struct device_node *ep = NULL;
145 /* Avoid error print by of_graph_get_next_endpoint() if there
146 * is no ports present.
148 node = of_get_child_by_name(dev->of_node, "ports");
150 node = of_get_child_by_name(dev->of_node, "port");
155 while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
156 node = of_graph_get_remote_port_parent(ep);
157 if (!node && !of_device_is_available(node)) {
162 dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
164 component_match_add(dev, match, dev_match_of, node);
170 dev_err(dev, "Only one external encoder is supported\n");