1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * FB driver for the HX8357D LCD Controller 4 * Copyright (C) 2015 Adafruit Industries 5 * 6 * Based on the HX8347D FB driver 7 * Copyright (C) 2013 Christian Vogelgsang 8 * 9 * Based on driver code found here: https://github.com/watterott/r61505u-Adapter 10 */ 11 12 #include <linux/module.h> 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/delay.h> 16 #include <video/mipi_display.h> 17 18 #include "fbtft.h" 19 #include "fb_hx8357d.h" 20 21 #define DRVNAME "fb_hx8357d" 22 #define WIDTH 320 23 #define HEIGHT 480 24 25 static int init_display(struct fbtft_par *par) 26 { 27 par->fbtftops.reset(par); 28 29 /* Reset things like Gamma */ 30 write_reg(par, MIPI_DCS_SOFT_RESET); 31 usleep_range(5000, 7000); 32 33 /* setextc */ 34 write_reg(par, HX8357D_SETC, 0xFF, 0x83, 0x57); 35 msleep(150); 36 37 /* setRGB which also enables SDO */ 38 write_reg(par, HX8357_SETRGB, 0x00, 0x00, 0x06, 0x06); 39 40 /* -1.52V */ 41 write_reg(par, HX8357D_SETCOM, 0x25); 42 43 /* Normal mode 70Hz, Idle mode 55 Hz */ 44 write_reg(par, HX8357_SETOSC, 0x68); 45 46 /* Set Panel - BGR, Gate direction swapped */ 47 write_reg(par, HX8357_SETPANEL, 0x05); 48 49 write_reg(par, HX8357_SETPWR1, 50 0x00, /* Not deep standby */ 51 0x15, /* BT */ 52 0x1C, /* VSPR */ 53 0x1C, /* VSNR */ 54 0x83, /* AP */ 55 0xAA); /* FS */ 56 57 write_reg(par, HX8357D_SETSTBA, 58 0x50, /* OPON normal */ 59 0x50, /* OPON idle */ 60 0x01, /* STBA */ 61 0x3C, /* STBA */ 62 0x1E, /* STBA */ 63 0x08); /* GEN */ 64 65 write_reg(par, HX8357D_SETCYC, 66 0x02, /* NW 0x02 */ 67 0x40, /* RTN */ 68 0x00, /* DIV */ 69 0x2A, /* DUM */ 70 0x2A, /* DUM */ 71 0x0D, /* GDON */ 72 0x78); /* GDOFF */ 73 74 write_reg(par, HX8357D_SETGAMMA, 75 0x02, 76 0x0A, 77 0x11, 78 0x1d, 79 0x23, 80 0x35, 81 0x41, 82 0x4b, 83 0x4b, 84 0x42, 85 0x3A, 86 0x27, 87 0x1B, 88 0x08, 89 0x09, 90 0x03, 91 0x02, 92 0x0A, 93 0x11, 94 0x1d, 95 0x23, 96 0x35, 97 0x41, 98 0x4b, 99 0x4b, 100 0x42, 101 0x3A, 102 0x27, 103 0x1B, 104 0x08, 105 0x09, 106 0x03, 107 0x00, 108 0x01); 109 110 /* 16 bit */ 111 write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55); 112 113 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0xC0); 114 115 /* TE off */ 116 write_reg(par, MIPI_DCS_SET_TEAR_ON, 0x00); 117 118 /* tear line */ 119 write_reg(par, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02); 120 121 /* Exit Sleep */ 122 write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); 123 msleep(150); 124 125 /* display on */ 126 write_reg(par, MIPI_DCS_SET_DISPLAY_ON); 127 usleep_range(5000, 7000); 128 129 return 0; 130 } 131 132 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 133 { 134 write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 135 xs >> 8, xs & 0xff, /* XSTART */ 136 xe >> 8, xe & 0xff); /* XEND */ 137 138 write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 139 ys >> 8, ys & 0xff, /* YSTART */ 140 ye >> 8, ye & 0xff); /* YEND */ 141 142 write_reg(par, MIPI_DCS_WRITE_MEMORY_START); 143 } 144 145 #define HX8357D_MADCTL_MY 0x80 146 #define HX8357D_MADCTL_MX 0x40 147 #define HX8357D_MADCTL_MV 0x20 148 #define HX8357D_MADCTL_ML 0x10 149 #define HX8357D_MADCTL_RGB 0x00 150 #define HX8357D_MADCTL_BGR 0x08 151 #define HX8357D_MADCTL_MH 0x04 152 static int set_var(struct fbtft_par *par) 153 { 154 u8 val; 155 156 switch (par->info->var.rotate) { 157 case 270: 158 val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX; 159 break; 160 case 180: 161 val = 0; 162 break; 163 case 90: 164 val = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY; 165 break; 166 default: 167 val = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY; 168 break; 169 } 170 171 val |= (par->bgr ? HX8357D_MADCTL_RGB : HX8357D_MADCTL_BGR); 172 173 /* Memory Access Control */ 174 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val); 175 176 return 0; 177 } 178 179 static struct fbtft_display display = { 180 .regwidth = 8, 181 .width = WIDTH, 182 .height = HEIGHT, 183 .gamma_num = 2, 184 .gamma_len = 14, 185 .fbtftops = { 186 .init_display = init_display, 187 .set_addr_win = set_addr_win, 188 .set_var = set_var, 189 }, 190 }; 191 192 FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8357d", &display); 193 194 MODULE_ALIAS("spi:" DRVNAME); 195 MODULE_ALIAS("platform:" DRVNAME); 196 MODULE_ALIAS("spi:hx8357d"); 197 MODULE_ALIAS("platform:hx8357d"); 198 199 MODULE_DESCRIPTION("FB driver for the HX8357D LCD Controller"); 200 MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>"); 201 MODULE_LICENSE("GPL"); 202