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

   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
  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, 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, seqp, 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, &cmdwritten, 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, seqp, 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(8000, 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, s6e63m0_dsi_dcs_read,
 105                             s6e63m0_dsi_dcs_write, 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 int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
 117 {
 118         mipi_dsi_detach(dsi);
 119         s6e63m0_remove(&dsi->dev);
 120         return 0;
 121 }
 122
 123 static const struct of_device_id s6e63m0_dsi_of_match[] = {
 124         { .compatible = "samsung,s6e63m0" },
 125         { /* sentinel */ }
 126 };
 127 MODULE_DEVICE_TABLE(of, s6e63m0_dsi_of_match);
 128
 129 static struct mipi_dsi_driver s6e63m0_dsi_driver = {
 130         .probe                  = s6e63m0_dsi_probe,
 131         .remove                 = s6e63m0_dsi_remove,
 132         .driver                 = {
 133                 .name           = "panel-samsung-s6e63m0",
 134                 .of_match_table = s6e63m0_dsi_of_match,
 135         },
 136 };
 137 module_mipi_dsi_driver(s6e63m0_dsi_driver);
 138
 139 MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
 140 MODULE_DESCRIPTION("s6e63m0 LCD DSI Driver");
 141 MODULE_LICENSE("GPL v2");