1// SPDX-License-Identifier: GPL-2.0
2/*
3 * DSI interface to the Samsung S6E63M0 panel.
4 * (C) 2019 Linus Walleij
5 */
6
7#include <linux/module.h>
8#include <linux/delay.h>
9#include <linux/mod_devicetable.h>
10
11#include <drm/drm_mipi_dsi.h>
12#include <drm/drm_print.h>
13
14#include "panel-samsung-s6e63m0.h"
15
16#define MCS_GLOBAL_PARAM 0xb0
17#define S6E63M0_DSI_MAX_CHUNK 15 /* CMD + 15 bytes max */
18
19static int s6e63m0_dsi_dcs_read(struct device *dev, void *trsp,
20 const u8 cmd, u8 *data)
21{
22 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
23 int ret;
24
25 ret = mipi_dsi_dcs_read(dsi, cmd, data, len: 1);
26 if (ret < 0) {
27 dev_err(dev, "could not read DCS CMD %02x\n", cmd);
28 return ret;
29 }
30
31 dev_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
32
33 return 0;
34}
35
36static int s6e63m0_dsi_dcs_write(struct device *dev, void *trsp,
37 const u8 *data, size_t len)
38{
39 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
40 const u8 *seqp = data;
41 u8 cmd;
42 u8 cmdwritten;
43 int remain;
44 int chunk;
45 int ret;
46
47 dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
48
49 /* Pick out and skip past the DCS command */
50 cmd = *seqp;
51 seqp++;
52 cmdwritten = 0;
53 remain = len - 1;
54 chunk = remain;
55
56 /* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
57 if (chunk > S6E63M0_DSI_MAX_CHUNK)
58 chunk = S6E63M0_DSI_MAX_CHUNK;
59 ret = mipi_dsi_dcs_write(dsi, cmd, data: seqp, len: chunk);
60 if (ret < 0) {
61 dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
62 return ret;
63 }
64 cmdwritten += chunk;
65 seqp += chunk;
66
67 while (cmdwritten < remain) {
68 chunk = remain - cmdwritten;
69 if (chunk > S6E63M0_DSI_MAX_CHUNK)
70 chunk = S6E63M0_DSI_MAX_CHUNK;
71 ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, data: &cmdwritten, len: 1);
72 if (ret < 0) {
73 dev_err(dev, "error sending CMD %02x global param %02x\n",
74 cmd, cmdwritten);
75 return ret;
76 }
77 ret = mipi_dsi_dcs_write(dsi, cmd, data: seqp, len: chunk);
78 if (ret < 0) {
79 dev_err(dev, "error sending CMD %02x chunk\n", cmd);
80 return ret;
81 }
82 cmdwritten += chunk;
83 seqp += chunk;
84 }
85 dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
86
87 usleep_range(min: 8000, max: 9000);
88
89 return 0;
90}
91
92static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
93{
94 struct device *dev = &dsi->dev;
95 int ret;
96
97 dsi->lanes = 2;
98 dsi->format = MIPI_DSI_FMT_RGB888;
99 dsi->hs_rate = 349440000;
100 dsi->lp_rate = 9600000;
101 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
102 MIPI_DSI_MODE_VIDEO_BURST;
103
104 ret = s6e63m0_probe(dev, NULL, dcs_read: s6e63m0_dsi_dcs_read,
105 dcs_write: s6e63m0_dsi_dcs_write, dsi_mode: true);
106 if (ret)
107 return ret;
108
109 ret = mipi_dsi_attach(dsi);
110 if (ret < 0)
111 s6e63m0_remove(dev);
112
113 return ret;
114}
115
116static void s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
117{
118 mipi_dsi_detach(dsi);
119 s6e63m0_remove(dev: &dsi->dev);
120}
121
122static const struct of_device_id s6e63m0_dsi_of_match[] = {
123 { .compatible = "samsung,s6e63m0" },
124 { /* sentinel */ }
125};
126MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
127
128static struct mipi_dsi_driver s6e63m0_dsi_driver = {
129 .probe = s6e63m0_dsi_probe,
130 .remove = s6e63m0_dsi_remove,
131 .driver = {
132 .name = "panel-samsung-s6e63m0",
133 .of_match_table = s6e63m0_dsi_of_match,
134 },
135};
136module_mipi_dsi_driver(s6e63m0_dsi_driver);
137
138MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
139MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
140MODULE_LICENSE("GPL v2");
141

source code of linux/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c