1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * DSI interface to the Samsung S6E63M0 panel.
4*4882a593Smuzhiyun * (C) 2019 Linus Walleij
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/delay.h>
9*4882a593Smuzhiyun #include <linux/of_device.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <drm/drm_mipi_dsi.h>
12*4882a593Smuzhiyun #include <drm/drm_print.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "panel-samsung-s6e63m0.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define MCS_GLOBAL_PARAM 0xb0
17*4882a593Smuzhiyun #define S6E63M0_DSI_MAX_CHUNK 15 /* CMD + 15 bytes max */
18*4882a593Smuzhiyun
s6e63m0_dsi_dcs_read(struct device * dev,const u8 cmd,u8 * data)19*4882a593Smuzhiyun static int s6e63m0_dsi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
22*4882a593Smuzhiyun int ret;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
25*4882a593Smuzhiyun if (ret < 0) {
26*4882a593Smuzhiyun dev_err(dev, "could not read DCS CMD %02x\n", cmd);
27*4882a593Smuzhiyun return ret;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun dev_info(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
s6e63m0_dsi_dcs_write(struct device * dev,const u8 * data,size_t len)35*4882a593Smuzhiyun static int s6e63m0_dsi_dcs_write(struct device *dev, const u8 *data, size_t len)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
38*4882a593Smuzhiyun const u8 *seqp = data;
39*4882a593Smuzhiyun u8 cmd;
40*4882a593Smuzhiyun u8 cmdwritten;
41*4882a593Smuzhiyun int remain;
42*4882a593Smuzhiyun int chunk;
43*4882a593Smuzhiyun int ret;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun dev_info(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* Pick out and skip past the DCS command */
48*4882a593Smuzhiyun cmd = *seqp;
49*4882a593Smuzhiyun seqp++;
50*4882a593Smuzhiyun cmdwritten = 0;
51*4882a593Smuzhiyun remain = len - 1;
52*4882a593Smuzhiyun chunk = remain;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
55*4882a593Smuzhiyun if (chunk > S6E63M0_DSI_MAX_CHUNK)
56*4882a593Smuzhiyun chunk = S6E63M0_DSI_MAX_CHUNK;
57*4882a593Smuzhiyun ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
58*4882a593Smuzhiyun if (ret < 0) {
59*4882a593Smuzhiyun dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
60*4882a593Smuzhiyun return ret;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun cmdwritten += chunk;
63*4882a593Smuzhiyun seqp += chunk;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun while (cmdwritten < remain) {
66*4882a593Smuzhiyun chunk = remain - cmdwritten;
67*4882a593Smuzhiyun if (chunk > S6E63M0_DSI_MAX_CHUNK)
68*4882a593Smuzhiyun chunk = S6E63M0_DSI_MAX_CHUNK;
69*4882a593Smuzhiyun ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
70*4882a593Smuzhiyun if (ret < 0) {
71*4882a593Smuzhiyun dev_err(dev, "error sending CMD %02x global param %02x\n",
72*4882a593Smuzhiyun cmd, cmdwritten);
73*4882a593Smuzhiyun return ret;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
76*4882a593Smuzhiyun if (ret < 0) {
77*4882a593Smuzhiyun dev_err(dev, "error sending CMD %02x chunk\n", cmd);
78*4882a593Smuzhiyun return ret;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun cmdwritten += chunk;
81*4882a593Smuzhiyun seqp += chunk;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun dev_info(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun usleep_range(8000, 9000);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun return 0;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
s6e63m0_dsi_probe(struct mipi_dsi_device * dsi)90*4882a593Smuzhiyun static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
91*4882a593Smuzhiyun {
92*4882a593Smuzhiyun struct device *dev = &dsi->dev;
93*4882a593Smuzhiyun int ret;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun dsi->lanes = 2;
96*4882a593Smuzhiyun dsi->format = MIPI_DSI_FMT_RGB888;
97*4882a593Smuzhiyun dsi->hs_rate = 349440000;
98*4882a593Smuzhiyun dsi->lp_rate = 9600000;
99*4882a593Smuzhiyun dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
100*4882a593Smuzhiyun MIPI_DSI_MODE_VIDEO_BURST;
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_read, s6e63m0_dsi_dcs_write,
103*4882a593Smuzhiyun true);
104*4882a593Smuzhiyun if (ret)
105*4882a593Smuzhiyun return ret;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun ret = mipi_dsi_attach(dsi);
108*4882a593Smuzhiyun if (ret < 0)
109*4882a593Smuzhiyun s6e63m0_remove(dev);
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun return ret;
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
s6e63m0_dsi_remove(struct mipi_dsi_device * dsi)114*4882a593Smuzhiyun static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
115*4882a593Smuzhiyun {
116*4882a593Smuzhiyun mipi_dsi_detach(dsi);
117*4882a593Smuzhiyun return s6e63m0_remove(&dsi->dev);
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun static const struct of_device_id s6e63m0_dsi_of_match[] = {
121*4882a593Smuzhiyun { .compatible = "samsung,s6e63m0" },
122*4882a593Smuzhiyun { /* sentinel */ }
123*4882a593Smuzhiyun };
124*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun static struct mipi_dsi_driver s6e63m0_dsi_driver = {
127*4882a593Smuzhiyun .probe = s6e63m0_dsi_probe,
128*4882a593Smuzhiyun .remove = s6e63m0_dsi_remove,
129*4882a593Smuzhiyun .driver = {
130*4882a593Smuzhiyun .name = "panel-samsung-s6e63m0",
131*4882a593Smuzhiyun .of_match_table = s6e63m0_dsi_of_match,
132*4882a593Smuzhiyun },
133*4882a593Smuzhiyun };
134*4882a593Smuzhiyun module_mipi_dsi_driver(s6e63m0_dsi_driver);
135*4882a593Smuzhiyun
136*4882a593Smuzhiyun MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
137*4882a593Smuzhiyun MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
138*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
139