summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
blob: 6967325cd8ee0df88294aae31fbbd85d24e733df (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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 * Copyright 2019,2020,2022 NXP
 */

#include <linux/export.h>
#include <linux/media-bus-format.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>

#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_print.h>

#include "imx-ldb-helper.h"

bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch)
{
	return ldb_ch->link_type == LDB_CH_SINGLE_LINK;
}
EXPORT_SYMBOL_GPL(ldb_channel_is_single_link);

bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch)
{
	return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS ||
	       ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
}
EXPORT_SYMBOL_GPL(ldb_channel_is_split_link);

int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
				   struct drm_bridge_state *bridge_state,
				   struct drm_crtc_state *crtc_state,
				   struct drm_connector_state *conn_state)
{
	struct ldb_channel *ldb_ch = bridge->driver_private;

	ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format;
	ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format;

	return 0;
}
EXPORT_SYMBOL_GPL(ldb_bridge_atomic_check_helper);

void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
				const struct drm_display_mode *mode,
				const struct drm_display_mode *adjusted_mode)
{
	struct ldb_channel *ldb_ch = bridge->driver_private;
	struct ldb *ldb = ldb_ch->ldb;
	bool is_split = ldb_channel_is_split_link(ldb_ch);

	if (is_split)
		ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;

	switch (ldb_ch->out_bus_format) {
	case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
		break;
	case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
		if (ldb_ch->chno == 0 || is_split)
			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
		if (ldb_ch->chno == 1 || is_split)
			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
		break;
	case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
		if (ldb_ch->chno == 0 || is_split)
			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
					 LDB_BIT_MAP_CH0_JEIDA;
		if (ldb_ch->chno == 1 || is_split)
			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
					 LDB_BIT_MAP_CH1_JEIDA;
		break;
	}
}
EXPORT_SYMBOL_GPL(ldb_bridge_mode_set_helper);

void ldb_bridge_enable_helper(struct drm_bridge *bridge)
{
	struct ldb_channel *ldb_ch = bridge->driver_private;
	struct ldb *ldb = ldb_ch->ldb;

	/*
	 * Platform specific bridge drivers should set ldb_ctrl properly
	 * for the enablement, so just write the ctrl_reg here.
	 */
	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
}
EXPORT_SYMBOL_GPL(ldb_bridge_enable_helper);

void ldb_bridge_disable_helper(struct drm_bridge *bridge)
{
	struct ldb_channel *ldb_ch = bridge->driver_private;
	struct ldb *ldb = ldb_ch->ldb;
	bool is_split = ldb_channel_is_split_link(ldb_ch);

	if (ldb_ch->chno == 0 || is_split)
		ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
	if (ldb_ch->chno == 1 || is_split)
		ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;

	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
}
EXPORT_SYMBOL_GPL(ldb_bridge_disable_helper);

int ldb_bridge_attach_helper(struct drm_bridge *bridge,
			     enum drm_bridge_attach_flags flags)
{
	struct ldb_channel *ldb_ch = bridge->driver_private;
	struct ldb *ldb = ldb_ch->ldb;

	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
		DRM_DEV_ERROR(ldb->dev,
			      "do not support creating a drm_connector\n");
		return -EINVAL;
	}

	if (!bridge->encoder) {
		DRM_DEV_ERROR(ldb->dev, "missing encoder\n");
		return -ENODEV;
	}

	return drm_bridge_attach(bridge->encoder,
				ldb_ch->next_bridge, bridge,
				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
}
EXPORT_SYMBOL_GPL(ldb_bridge_attach_helper);

int ldb_init_helper(struct ldb *ldb)
{
	struct device *dev = ldb->dev;
	struct device_node *np = dev->of_node;
	struct device_node *child;
	int ret;
	u32 i;

	ldb->regmap = syscon_node_to_regmap(np->parent);
	if (IS_ERR(ldb->regmap)) {
		ret = PTR_ERR(ldb->regmap);
		if (ret != -EPROBE_DEFER)
			DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
		return ret;
	}

	for_each_available_child_of_node(np, child) {
		struct ldb_channel *ldb_ch;

		ret = of_property_read_u32(child, "reg", &i);
		if (ret || i > MAX_LDB_CHAN_NUM - 1) {
			ret = -EINVAL;
			DRM_DEV_ERROR(dev,
				      "invalid channel node address: %u\n", i);
			of_node_put(child);
			return ret;
		}

		ldb_ch = ldb->channel[i];
		ldb_ch->ldb = ldb;
		ldb_ch->chno = i;
		ldb_ch->is_available = true;
		ldb_ch->np = child;

		ldb->available_ch_cnt++;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ldb_init_helper);

int ldb_find_next_bridge_helper(struct ldb *ldb)
{
	struct device *dev = ldb->dev;
	struct ldb_channel *ldb_ch;
	int ret, i;

	for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
		ldb_ch = ldb->channel[i];

		if (!ldb_ch->is_available)
			continue;

		ldb_ch->next_bridge = devm_drm_of_get_bridge(dev, ldb_ch->np,
							     1, 0);
		if (IS_ERR(ldb_ch->next_bridge)) {
			ret = PTR_ERR(ldb_ch->next_bridge);
			if (ret != -EPROBE_DEFER)
				DRM_DEV_ERROR(dev,
					      "failed to get next bridge: %d\n",
					      ret);
			return ret;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ldb_find_next_bridge_helper);

void ldb_add_bridge_helper(struct ldb *ldb,
			   const struct drm_bridge_funcs *bridge_funcs)
{
	struct ldb_channel *ldb_ch;
	int i;

	for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
		ldb_ch = ldb->channel[i];

		if (!ldb_ch->is_available)
			continue;

		ldb_ch->bridge.driver_private = ldb_ch;
		ldb_ch->bridge.funcs = bridge_funcs;
		ldb_ch->bridge.of_node = ldb_ch->np;

		drm_bridge_add(&ldb_ch->bridge);
	}
}
EXPORT_SYMBOL_GPL(ldb_add_bridge_helper);

void ldb_remove_bridge_helper(struct ldb *ldb)
{
	struct ldb_channel *ldb_ch;
	int i;

	for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
		ldb_ch = ldb->channel[i];

		if (!ldb_ch->is_available)
			continue;

		drm_bridge_remove(&ldb_ch->bridge);
	}
}
EXPORT_SYMBOL_GPL(ldb_remove_bridge_helper);

MODULE_DESCRIPTION("i.MX8 LVDS Display Bridge(LDB)/Pixel Mapper bridge helper");
MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
MODULE_LICENSE("GPL");