summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c
blob: eec74c10dddaf35236a1502e612843b1126e5e91 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * DSI interface to the Samsung S6E63M0 panel.
 * (C) 2019 Linus Walleij
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/of_device.h>

#include <drm/drm_mipi_dsi.h>
#include <drm/drm_print.h>

#include "panel-samsung-s6e63m0.h"

#define MCS_GLOBAL_PARAM	0xb0
#define S6E63M0_DSI_MAX_CHUNK	15 /* CMD + 15 bytes max */

static int s6e63m0_dsi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
{
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
	int ret;

	ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
	if (ret < 0) {
		dev_err(dev, "could not read DCS CMD %02x\n", cmd);
		return ret;
	}

	dev_info(dev, "DSI read CMD %02x = %02x\n", cmd, *data);

	return 0;
}

static int s6e63m0_dsi_dcs_write(struct device *dev, const u8 *data, size_t len)
{
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
	const u8 *seqp = data;
	u8 cmd;
	u8 cmdwritten;
	int remain;
	int chunk;
	int ret;

	dev_info(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);

	/* Pick out and skip past the DCS command */
	cmd = *seqp;
	seqp++;
	cmdwritten = 0;
	remain = len - 1;
	chunk = remain;

	/* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
	if (chunk > S6E63M0_DSI_MAX_CHUNK)
		chunk = S6E63M0_DSI_MAX_CHUNK;
	ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
	if (ret < 0) {
		dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
		return ret;
	}
	cmdwritten += chunk;
	seqp += chunk;

	while (cmdwritten < remain) {
		chunk = remain - cmdwritten;
		if (chunk > S6E63M0_DSI_MAX_CHUNK)
			chunk = S6E63M0_DSI_MAX_CHUNK;
		ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
		if (ret < 0) {
			dev_err(dev, "error sending CMD %02x global param %02x\n",
				cmd, cmdwritten);
			return ret;
		}
		ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
		if (ret < 0) {
			dev_err(dev, "error sending CMD %02x chunk\n", cmd);
			return ret;
		}
		cmdwritten += chunk;
		seqp += chunk;
	}
	dev_info(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);

	usleep_range(8000, 9000);

	return 0;
}

static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
{
	struct device *dev = &dsi->dev;
	int ret;

	dsi->lanes = 2;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->hs_rate = 349440000;
	dsi->lp_rate = 9600000;
	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
		MIPI_DSI_MODE_EOT_PACKET |
		MIPI_DSI_MODE_VIDEO_BURST;

	ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_read, s6e63m0_dsi_dcs_write,
			    true);
	if (ret)
		return ret;

	ret = mipi_dsi_attach(dsi);
	if (ret < 0)
		s6e63m0_remove(dev);

	return ret;
}

static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
{
	mipi_dsi_detach(dsi);
	return s6e63m0_remove(&dsi->dev);
}

static const struct of_device_id s6e63m0_dsi_of_match[] = {
	{ .compatible = "samsung,s6e63m0" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);

static struct mipi_dsi_driver s6e63m0_dsi_driver = {
	.probe			= s6e63m0_dsi_probe,
	.remove			= s6e63m0_dsi_remove,
	.driver			= {
		.name		= "panel-samsung-s6e63m0",
		.of_match_table = s6e63m0_dsi_of_match,
	},
};
module_mipi_dsi_driver(s6e63m0_dsi_driver);

MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
MODULE_LICENSE("GPL v2");