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 | |
19 | static 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 | |
36 | static 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 | |
92 | static 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 | |
116 | static void s6e63m0_dsi_remove(struct mipi_dsi_device *dsi) |
117 | { |
118 | mipi_dsi_detach(dsi); |
119 | s6e63m0_remove(dev: &dsi->dev); |
120 | } |
121 | |
122 | static const struct of_device_id s6e63m0_dsi_of_match[] = { |
123 | { .compatible = "samsung,s6e63m0" }, |
124 | { /* sentinel */ } |
125 | }; |
126 | MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match); |
127 | |
128 | static 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 | }; |
136 | module_mipi_dsi_driver(s6e63m0_dsi_driver); |
137 | |
138 | MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>" ); |
139 | MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver" ); |
140 | MODULE_LICENSE("GPL v2" ); |
141 | |