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"); 140