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 = NULL, *iter;
64
65	list_for_each_entry(iter, &ddev->mode_config.encoder_list, head)
66		if (iter->possible_crtcs & (1 << priv->crtc->index)) {
67			encoder = iter;
68			break;
69		}
70
71	if (!encoder) {
72		dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
73		return -ENODEV;
74	}
75
76	priv->external_connector =
77		tilcdc_encoder_find_connector(ddev, encoder);
78
79	if (!priv->external_connector)
80		return -ENODEV;
81
82	/* Only tda998x is supported at the moment. */
83	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
84	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
85
86	return 0;
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, 0);
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_simple_encoder_init(ddev, priv->external_encoder,
134				      DRM_MODE_ENCODER_NONE);
135	if (ret) {
136		dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
137		return ret;
138	}
139
140	if (panel) {
141		bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
142							 DRM_MODE_CONNECTOR_DPI);
143		if (IS_ERR(bridge)) {
144			ret = PTR_ERR(bridge);
145			goto err_encoder_cleanup;
146		}
147	}
148
149	ret = tilcdc_attach_bridge(ddev, bridge);
150	if (ret)
151		goto err_encoder_cleanup;
152
153	return 0;
154
155err_encoder_cleanup:
156	drm_encoder_cleanup(priv->external_encoder);
157	return ret;
158}
159
160static int dev_match_of(struct device *dev, void *data)
161{
162	return dev->of_node == data;
163}
164
165int tilcdc_get_external_components(struct device *dev,
166				   struct component_match **match)
167{
168	struct device_node *node;
169
170	node = of_graph_get_remote_node(dev->of_node, 0, 0);
171
172	if (!of_device_is_compatible(node, "nxp,tda998x")) {
173		of_node_put(node);
174		return 0;
175	}
176
177	if (match)
178		drm_of_component_match_add(dev, match, dev_match_of, node);
179	of_node_put(node);
180	return 1;
181}
182