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
10 #include <drm/drm_mipi_dsi.h>
11 #include <drm/drm_print.h>
12
13 #include "panel-samsung-s6e63m0.h"
14
15 #define MCS_GLOBAL_PARAM 0xb0
16 #define S6E63M0_DSI_MAX_CHUNK 15 /* CMD + 15 bytes max */
17
s6e63m0_dsi_dcs_read(struct device * dev,void * trsp,const u8 cmd,u8 * data)18 static int s6e63m0_dsi_dcs_read(struct device *dev, void *trsp,
19 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_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
31
32 return 0;
33 }
34
s6e63m0_dsi_dcs_write(struct device * dev,void * trsp,const u8 * data,size_t len)35 static int s6e63m0_dsi_dcs_write(struct device *dev, void *trsp,
36 const u8 *data, size_t len)
37 {
38 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
39 const u8 *seqp = data;
40 u8 cmd;
41 u8 cmdwritten;
42 int remain;
43 int chunk;
44 int ret;
45
46 dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
47
48 /* Pick out and skip past the DCS command */
49 cmd = *seqp;
50 seqp++;
51 cmdwritten = 0;
52 remain = len - 1;
53 chunk = remain;
54
55 /* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
56 if (chunk > S6E63M0_DSI_MAX_CHUNK)
57 chunk = S6E63M0_DSI_MAX_CHUNK;
58 ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
59 if (ret < 0) {
60 dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
61 return ret;
62 }
63 cmdwritten += chunk;
64 seqp += chunk;
65
66 while (cmdwritten < remain) {
67 chunk = remain - cmdwritten;
68 if (chunk > S6E63M0_DSI_MAX_CHUNK)
69 chunk = S6E63M0_DSI_MAX_CHUNK;
70 ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
71 if (ret < 0) {
72 dev_err(dev, "error sending CMD %02x global param %02x\n",
73 cmd, cmdwritten);
74 return ret;
75 }
76 ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
77 if (ret < 0) {
78 dev_err(dev, "error sending CMD %02x chunk\n", cmd);
79 return ret;
80 }
81 cmdwritten += chunk;
82 seqp += chunk;
83 }
84 dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
85
86 usleep_range(8000, 9000);
87
88 return 0;
89 }
90
s6e63m0_dsi_probe(struct mipi_dsi_device * dsi)91 static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
92 {
93 struct device *dev = &dsi->dev;
94 int ret;
95
96 dsi->lanes = 2;
97 dsi->format = MIPI_DSI_FMT_RGB888;
98 dsi->hs_rate = 349440000;
99 dsi->lp_rate = 9600000;
100 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
101 MIPI_DSI_MODE_VIDEO_BURST;
102
103 ret = s6e63m0_probe(dev, NULL, s6e63m0_dsi_dcs_read,
104 s6e63m0_dsi_dcs_write, true);
105 if (ret)
106 return ret;
107
108 ret = mipi_dsi_attach(dsi);
109 if (ret < 0)
110 s6e63m0_remove(dev);
111
112 return ret;
113 }
114
s6e63m0_dsi_remove(struct mipi_dsi_device * dsi)115 static void s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
116 {
117 mipi_dsi_detach(dsi);
118 s6e63m0_remove(&dsi->dev);
119 }
120
121 static const struct of_device_id s6e63m0_dsi_of_match[] = {
122 { .compatible = "samsung,s6e63m0" },
123 { /* sentinel */ }
124 };
125 MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
126
127 static struct mipi_dsi_driver s6e63m0_dsi_driver = {
128 .probe = s6e63m0_dsi_probe,
129 .remove = s6e63m0_dsi_remove,
130 .driver = {
131 .name = "panel-samsung-s6e63m0",
132 .of_match_table = s6e63m0_dsi_of_match,
133 },
134 };
135 module_mipi_dsi_driver(s6e63m0_dsi_driver);
136
137 MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
138 MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
139 MODULE_LICENSE("GPL v2");
140