panel-samsung-s6e63m0-dsi.c 3.1 KB

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