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