summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
blob: 7ecec7b04a8d0b0794bdd784fd0d7c7c5ba0a71c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
// SPDX-License-Identifier: GPL-2.0+
/*
 * R-Car Display Unit Encoder
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <linux/export.h>
#include <linux/of.h>

#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_panel.h>

#include "rcar_du_drv.h"
#include "rcar_du_encoder.h"
#include "rcar_lvds.h"

/* -----------------------------------------------------------------------------
 * Encoder
 */

static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
{
	struct device_node *ports;
	struct device_node *port;
	unsigned int num_ports = 0;

	ports = of_get_child_by_name(node, "ports");
	if (!ports)
		ports = of_node_get(node);

	for_each_child_of_node(ports, port) {
		if (of_node_name_eq(port, "port"))
			num_ports++;
	}

	of_node_put(ports);

	return num_ports;
}

static const struct drm_encoder_funcs rcar_du_encoder_funcs = {
};

int rcar_du_encoder_init(struct rcar_du_device *rcdu,
			 enum rcar_du_output output,
			 struct device_node *enc_node)
{
	struct rcar_du_encoder *renc;
	struct drm_connector *connector;
	struct drm_bridge *bridge;
	int ret;

	/*
	 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
	 * DT node has a single port, assume that it describes a panel and
	 * create a panel bridge.
	 */
	if ((output == RCAR_DU_OUTPUT_DPAD0 ||
	     output == RCAR_DU_OUTPUT_DPAD1) &&
	    rcar_du_encoder_count_ports(enc_node) == 1) {
		struct drm_panel *panel = of_drm_find_panel(enc_node);

		if (IS_ERR(panel))
			return PTR_ERR(panel);

		bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
							 DRM_MODE_CONNECTOR_DPI);
		if (IS_ERR(bridge))
			return PTR_ERR(bridge);
	} else {
		bridge = of_drm_find_bridge(enc_node);
		if (!bridge)
			return -EPROBE_DEFER;

		if (output == RCAR_DU_OUTPUT_LVDS0 ||
		    output == RCAR_DU_OUTPUT_LVDS1)
			rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;

		if (output == RCAR_DU_OUTPUT_DSI0 ||
		    output == RCAR_DU_OUTPUT_DSI1)
			rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = bridge;
	}

	/*
	 * Create and initialize the encoder. On Gen3, skip the LVDS1 output if
	 * the LVDS1 encoder is used as a companion for LVDS0 in dual-link
	 * mode, or any LVDS output if it isn't connected. The latter may happen
	 * on D3 or E3 as the LVDS encoders are needed to provide the pixel
	 * clock to the DU, even when the LVDS outputs are not used.
	 */
	if (rcdu->info->gen >= 3) {
		if (output == RCAR_DU_OUTPUT_LVDS1 &&
		    rcar_lvds_dual_link(bridge))
			return -ENOLINK;

		if ((output == RCAR_DU_OUTPUT_LVDS0 ||
		     output == RCAR_DU_OUTPUT_LVDS1) &&
		    !rcar_lvds_is_connected(bridge))
			return -ENOLINK;
	}

	dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n",
		enc_node, rcar_du_output_name(output));

	renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base,
				  &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE,
				  NULL);
	if (IS_ERR(renc))
		return PTR_ERR(renc);

	renc->output = output;

	/* Attach the bridge to the encoder. */
	ret = drm_bridge_attach(&renc->base, bridge, NULL,
				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
	if (ret) {
		dev_err(rcdu->dev,
			"failed to attach bridge %pOF for output %s (%d)\n",
			bridge->of_node, rcar_du_output_name(output), ret);
		return ret;
	}

	/* Create the connector for the chain of bridges. */
	connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
	if (IS_ERR(connector)) {
		dev_err(rcdu->dev,
			"failed to created connector for output %s (%ld)\n",
			rcar_du_output_name(output), PTR_ERR(connector));
		return PTR_ERR(connector);
	}

	return drm_connector_attach_encoder(connector, &renc->base);
}