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, 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_info(dev, "DSI read CMD %02x = %02x\n", cmd, *data);
  31
  32         return 0;
  33 }
  34
  35 static int s6e63m0_dsi_dcs_write(struct device *dev, const u8 *data, size_t len)
  36 {
  37         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
  38         const u8 *seqp = data;
  39         u8 cmd;
  40         u8 cmdwritten;
  41         int remain;
  42         int chunk;
  43         int ret;
  44
  45         dev_info(dev, "DSI writing dcs seq: %*ph\n", (int)len, data);
  46
  47         /* Pick out and skip past the DCS command */
  48         cmd = *seqp;
  49         seqp++;
  50         cmdwritten = 0;
  51         remain = len - 1;
  52         chunk = remain;
  53
  54         /* Send max S6E63M0_DSI_MAX_CHUNK bytes at a time */
  55         if (chunk > S6E63M0_DSI_MAX_CHUNK)
  56                 chunk = S6E63M0_DSI_MAX_CHUNK;
  57         ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
  58         if (ret < 0) {
  59                 dev_err(dev, "error sending DCS command seq cmd %02x\n", cmd);
  60                 return ret;
  61         }
  62         cmdwritten += chunk;
  63         seqp += chunk;
  64
  65         while (cmdwritten < remain) {
  66                 chunk = remain - cmdwritten;
  67                 if (chunk > S6E63M0_DSI_MAX_CHUNK)
  68                         chunk = S6E63M0_DSI_MAX_CHUNK;
  69                 ret = mipi_dsi_dcs_write(dsi, MCS_GLOBAL_PARAM, &cmdwritten, 1);
  70                 if (ret < 0) {
  71                         dev_err(dev, "error sending CMD %02x global param %02x\n",
  72                                 cmd, cmdwritten);
  73                         return ret;
  74                 }
  75                 ret = mipi_dsi_dcs_write(dsi, cmd, seqp, chunk);
  76                 if (ret < 0) {
  77                         dev_err(dev, "error sending CMD %02x chunk\n", cmd);
  78                         return ret;
  79                 }
  80                 cmdwritten += chunk;
  81                 seqp += chunk;
  82         }
  83         dev_info(dev, "sent command %02x %02x bytes\n", cmd, cmdwritten);
  84
  85         usleep_range(8000, 9000);
  86
  87         return 0;
  88 }
  89
  90 static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi)
  91 {
  92         struct device *dev = &dsi->dev;
  93         int ret;
  94
  95         dsi->lanes = 2;
  96         dsi->format = MIPI_DSI_FMT_RGB888;
  97         dsi->hs_rate = 349440000;
  98         dsi->lp_rate = 9600000;
  99         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 100                 MIPI_DSI_MODE_EOT_PACKET |
 101                 MIPI_DSI_MODE_VIDEO_BURST;
 102
 103         ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_read, s6e63m0_dsi_dcs_write,
 104                             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
 115 static int s6e63m0_dsi_remove(struct mipi_dsi_device *dsi)
 116 {
 117         mipi_dsi_detach(dsi);
 118         return 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");