drm/panel/panel-samsung-s6e63m0-dsi.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * DSI interface to the Samsung S6E63M0 panel.
0004  * (C) 2019 Linus Walleij
0005  */
0006
0007 #include <linux/module.h>
0008 #include <linux/delay.h>
0009 #include <linux/of_device.h>
0010
0011 #include <drm/drm_mipi_dsi.h>
0012 #include <drm/drm_print.h>
0013
0014 #include "panel-samsung-s6e63m0.h"
0015
0016 #define MCS_GLOBAL_PARAM    0xb0
0017 #define S6E63M0_DSI_MAX_CHUNK   15 /* CMD + 15 bytes max */
0018
0019 static int s6e63m0_dsi_dcs_read(struct device *dev, void *trsp,
0020                 const u8 cmd, u8 *data)
0021 {
0022     struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
0023     int ret;
0024
0025     ret = mipi_dsi_dcs_read(dsi, cmd, data, 1);
0026     if (ret < 0) {
0027         dev_err(dev, "could not read DCS CMD %02x\n", cmd);
0028         return ret;
0029     }
0030
0031     dev_dbg(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
0032
0033     return 0;
0034 }
0035
0036 static int s6e63m0_dsi_dcs_write(struct device *dev, void *trsp,
0037                  const u8 *data, size_t len)
0038 {
0039     struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
0040     const u8 *seqp = data;
0041     u8 cmd;
0042     u8 cmdwritten;
0043     int remain;
0044     int chunk;
0045     int ret;
0046
0047     dev_dbg(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
0048
0049     /* Pick out and skip past the DCS command */
0050     cmd = *seqp;
0051     seqp++;
0052     cmdwritten = 0;
0053     remain = len - 1;
0054     chunk = remain;
0055
0056     /* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
0057     if (chunk > S6E63M0_DSI_MAX_CHUNK)
0058         chunk = S6E63M0_DSI_MAX_CHUNK;
0059     ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
0060     if (ret < 0) {
0061         dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
0062         return ret;
0063     }
0064     cmdwritten += chunk;
0065     seqp += chunk;
0066
0067     while (cmdwritten < remain) {
0068         chunk = remain - cmdwritten;
0069         if (chunk > S6E63M0_DSI_MAX_CHUNK)
0070             chunk = S6E63M0_DSI_MAX_CHUNK;
0071         ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
0072         if (ret < 0) {
0073             dev_err(dev, "error sending CMD %02x global param %02x\n",
0074                 cmd, cmdwritten);
0075             return ret;
0076         }
0077         ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
0078         if (ret < 0) {
0079             dev_err(dev, "error sending CMD %02x chunk\n", cmd);
0080             return ret;
0081         }
0082         cmdwritten += chunk;
0083         seqp += chunk;
0084     }
0085     dev_dbg(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
0086
0087     usleep_range(8000, 9000);
0088
0089     return 0;
0090 }
0091
0092 static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
0093 {
0094     struct device *dev = &dsi->dev;
0095     int ret;
0096
0097     dsi->lanes = 2;
0098     dsi->format = MIPI_DSI_FMT_RGB888;
0099     dsi->hs_rate = 349440000;
0100     dsi->lp_rate = 9600000;
0101     dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
0102         MIPI_DSI_MODE_VIDEO_BURST;
0103
0104     ret = s6e63m0_probe(dev, NULL, s6e63m0_dsi_dcs_read,
0105                 s6e63m0_dsi_dcs_write, true);
0106     if (ret)
0107         return ret;
0108
0109     ret = mipi_dsi_attach(dsi);
0110     if (ret < 0)
0111         s6e63m0_remove(dev);
0112
0113     return ret;
0114 }
0115
0116 static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
0117 {
0118     mipi_dsi_detach(dsi);
0119     s6e63m0_remove(&dsi->dev);
0120     return 0;
0121 }
0122
0123 static const struct of_device_id s6e63m0_dsi_of_match[] = {
0124     { .compatible = "samsung,s6e63m0" },
0125     { /* sentinel */ }
0126 };
0127 MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
0128
0129 static struct mipi_dsi_driver s6e63m0_dsi_driver = {
0130     .probe          = s6e63m0_dsi_probe,
0131     .remove         = s6e63m0_dsi_remove,
0132     .driver         = {
0133         .name       = "panel-samsung-s6e63m0",
0134         .of_match_table = s6e63m0_dsi_of_match,
0135     },
0136 };
0137 module_mipi_dsi_driver(s6e63m0_dsi_driver);
0138
0139 MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
0140 MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
0141 MODULE_LICENSE("GPL v2");