summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/bridge/parade-ps8640.c
blob: 4b099196afeba12815bf41cc00372cbd4e8fd297 (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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2016 MediaTek Inc.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>

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

#define PAGE2_GPIO_H		0xa7
#define PS_GPIO9		BIT(1)
#define PAGE2_I2C_BYPASS	0xea
#define I2C_BYPASS_EN		0xd0
#define PAGE2_MCS_EN		0xf3
#define MCS_EN			BIT(0)
#define PAGE3_SET_ADD		0xfe
#define VDO_CTL_ADD		0x13
#define VDO_DIS			0x18
#define VDO_EN			0x1c
#define DP_NUM_LANES		4

/*
 * PS8640 uses multiple addresses:
 * page[0]: for DP control
 * page[1]: for VIDEO Bridge
 * page[2]: for control top
 * page[3]: for DSI Link Control1
 * page[4]: for MIPI Phy
 * page[5]: for VPLL
 * page[6]: for DSI Link Control2
 * page[7]: for SPI ROM mapping
 */
enum page_addr_offset {
	PAGE0_DP_CNTL = 0,
	PAGE1_VDO_BDG,
	PAGE2_TOP_CNTL,
	PAGE3_DSI_CNTL1,
	PAGE4_MIPI_PHY,
	PAGE5_VPLL,
	PAGE6_DSI_CNTL2,
	PAGE7_SPI_CNTL,
	MAX_DEVS
};

enum ps8640_vdo_control {
	DISABLE = VDO_DIS,
	ENABLE = VDO_EN,
};

struct ps8640 {
	struct drm_bridge bridge;
	struct drm_bridge *panel_bridge;
	struct mipi_dsi_device *dsi;
	struct i2c_client *page[MAX_DEVS];
	struct regulator_bulk_data supplies[2];
	struct gpio_desc *gpio_reset;
	struct gpio_desc *gpio_powerdown;
};

static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
{
	return container_of(e, struct ps8640, bridge);
}

static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
				     const enum ps8640_vdo_control ctrl)
{
	struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
	u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
	int ret;

	ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
					     sizeof(vdo_ctrl_buf),
					     vdo_ctrl_buf);
	if (ret < 0)
		return ret;

	return 0;
}

static void ps8640_pre_enable(struct drm_bridge *bridge)
{
	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
	struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
	unsigned long timeout;
	int ret, status;

	ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
				    ps_bridge->supplies);
	if (ret < 0) {
		DRM_ERROR("cannot enable regulators %d\n", ret);
		return;
	}

	gpiod_set_value(ps_bridge->gpio_powerdown, 0);
	gpiod_set_value(ps_bridge->gpio_reset, 1);
	usleep_range(2000, 2500);
	gpiod_set_value(ps_bridge->gpio_reset, 0);

	/*
	 * Wait for the ps8640 embedded MCU to be ready
	 * First wait 200ms and then check the MCU ready flag every 20ms
	 */
	msleep(200);

	timeout = jiffies + msecs_to_jiffies(200) + 1;

	while (time_is_after_jiffies(timeout)) {
		status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
		if (status < 0) {
			DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
			goto err_regulators_disable;
		}
		if ((status & PS_GPIO9) == PS_GPIO9)
			break;

		msleep(20);
	}

	msleep(50);

	/*
	 * The Manufacturer Command Set (MCS) is a device dependent interface
	 * intended for factory programming of the display module default
	 * parameters. Once the display module is configured, the MCS shall be
	 * disabled by the manufacturer. Once disabled, all MCS commands are
	 * ignored by the display interface.
	 */
	status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
	if (status < 0) {
		DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
		goto err_regulators_disable;
	}

	ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
					status & ~MCS_EN);
	if (ret < 0) {
		DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
		goto err_regulators_disable;
	}

	ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
	if (ret) {
		DRM_ERROR("failed to enable VDO: %d\n", ret);
		goto err_regulators_disable;
	}

	/* Switch access edp panel's edid through i2c */
	ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
					I2C_BYPASS_EN);
	if (ret < 0) {
		DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
		goto err_regulators_disable;
	}

	return;

err_regulators_disable:
	regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
			       ps_bridge->supplies);
}

static void ps8640_post_disable(struct drm_bridge *bridge)
{
	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
	int ret;

	ret = ps8640_bridge_vdo_control(ps_bridge, DISABLE);
	if (ret < 0)
		DRM_ERROR("failed to disable VDO: %d\n", ret);

	gpiod_set_value(ps_bridge->gpio_reset, 1);
	gpiod_set_value(ps_bridge->gpio_powerdown, 1);
	ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
				     ps_bridge->supplies);
	if (ret < 0)
		DRM_ERROR("cannot disable regulators %d\n", ret);
}

static int ps8640_bridge_attach(struct drm_bridge *bridge,
				enum drm_bridge_attach_flags flags)
{
	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
	struct device *dev = &ps_bridge->page[0]->dev;
	struct device_node *in_ep, *dsi_node;
	struct mipi_dsi_device *dsi;
	struct mipi_dsi_host *host;
	int ret;
	const struct mipi_dsi_device_info info = { .type = "ps8640",
						   .channel = 0,
						   .node = NULL,
						 };
	/* port@0 is ps8640 dsi input port */
	in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
	if (!in_ep)
		return -ENODEV;

	dsi_node = of_graph_get_remote_port_parent(in_ep);
	of_node_put(in_ep);
	if (!dsi_node)
		return -ENODEV;

	host = of_find_mipi_dsi_host_by_node(dsi_node);
	of_node_put(dsi_node);
	if (!host)
		return -ENODEV;

	dsi = mipi_dsi_device_register_full(host, &info);
	if (IS_ERR(dsi)) {
		dev_err(dev, "failed to create dsi device\n");
		ret = PTR_ERR(dsi);
		return ret;
	}

	ps_bridge->dsi = dsi;

	dsi->host = host;
	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
			  MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->lanes = DP_NUM_LANES;
	ret = mipi_dsi_attach(dsi);
	if (ret)
		goto err_dsi_attach;

	/* Attach the panel-bridge to the dsi bridge */
	return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
				 &ps_bridge->bridge, flags);

err_dsi_attach:
	mipi_dsi_device_unregister(dsi);
	return ret;
}

static const struct drm_bridge_funcs ps8640_bridge_funcs = {
	.attach = ps8640_bridge_attach,
	.post_disable = ps8640_post_disable,
	.pre_enable = ps8640_pre_enable,
};

static int ps8640_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct device_node *np = dev->of_node;
	struct ps8640 *ps_bridge;
	struct drm_panel *panel;
	int ret;
	u32 i;

	ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
	if (!ps_bridge)
		return -ENOMEM;

	/* port@1 is ps8640 output port */
	ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
	if (ret < 0)
		return ret;
	if (!panel)
		return -ENODEV;

	ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
	if (IS_ERR(ps_bridge->panel_bridge))
		return PTR_ERR(ps_bridge->panel_bridge);

	ps_bridge->supplies[0].supply = "vdd33";
	ps_bridge->supplies[1].supply = "vdd12";
	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
				      ps_bridge->supplies);
	if (ret)
		return ret;

	ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
						   GPIOD_OUT_HIGH);
	if (IS_ERR(ps_bridge->gpio_powerdown))
		return PTR_ERR(ps_bridge->gpio_powerdown);

	/*
	 * Assert the reset to avoid the bridge being initialized prematurely
	 */
	ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
					       GPIOD_OUT_HIGH);
	if (IS_ERR(ps_bridge->gpio_reset))
		return PTR_ERR(ps_bridge->gpio_reset);

	ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
	ps_bridge->bridge.of_node = dev->of_node;

	ps_bridge->page[PAGE0_DP_CNTL] = client;

	for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
		ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
							     client->adapter,
							     client->addr + i);
		if (IS_ERR(ps_bridge->page[i])) {
			dev_err(dev, "failed i2c dummy device, address %02x\n",
				client->addr + i);
			return PTR_ERR(ps_bridge->page[i]);
		}
	}

	i2c_set_clientdata(client, ps_bridge);

	drm_bridge_add(&ps_bridge->bridge);

	return 0;
}

static int ps8640_remove(struct i2c_client *client)
{
	struct ps8640 *ps_bridge = i2c_get_clientdata(client);

	drm_bridge_remove(&ps_bridge->bridge);

	return 0;
}

static const struct of_device_id ps8640_match[] = {
	{ .compatible = "parade,ps8640" },
	{ }
};
MODULE_DEVICE_TABLE(of, ps8640_match);

static struct i2c_driver ps8640_driver = {
	.probe_new = ps8640_probe,
	.remove = ps8640_remove,
	.driver = {
		.name = "ps8640",
		.of_match_table = ps8640_match,
	},
};
module_i2c_driver(ps8640_driver);

MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>");
MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
MODULE_LICENSE("GPL v2");