1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * DRM driver for the HX8357D LCD controller 4 * 5 * Copyright 2018 Broadcom 6 * Copyright 2018 David Lechner <david@lechnology.com> 7 * Copyright 2016 Noralf Trønnes 8 * Copyright (C) 2015 Adafruit Industries 9 * Copyright (C) 2013 Christian Vogelgsang 10 */ 11 12 #include <linux/backlight.h> 13 #include <linux/delay.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/module.h> 16 #include <linux/property.h> 17 #include <linux/spi/spi.h> 18 19 #include <drm/drm_atomic_helper.h> 20 #include <drm/drm_client_setup.h> 21 #include <drm/drm_drv.h> 22 #include <drm/drm_fbdev_dma.h> 23 #include <drm/drm_gem_atomic_helper.h> 24 #include <drm/drm_gem_dma_helper.h> 25 #include <drm/drm_managed.h> 26 #include <drm/drm_mipi_dbi.h> 27 #include <drm/drm_modeset_helper.h> 28 #include <video/mipi_display.h> 29 30 #define HX8357D_SETOSC 0xb0 31 #define HX8357D_SETPOWER 0xb1 32 #define HX8357D_SETRGB 0xb3 33 #define HX8357D_SETCYC 0xb3 34 #define HX8357D_SETCOM 0xb6 35 #define HX8357D_SETEXTC 0xb9 36 #define HX8357D_SETSTBA 0xc0 37 #define HX8357D_SETPANEL 0xcc 38 #define HX8357D_SETGAMMA 0xe0 39 40 #define HX8357D_MADCTL_MY 0x80 41 #define HX8357D_MADCTL_MX 0x40 42 #define HX8357D_MADCTL_MV 0x20 43 #define HX8357D_MADCTL_ML 0x10 44 #define HX8357D_MADCTL_RGB 0x00 45 #define HX8357D_MADCTL_BGR 0x08 46 #define HX8357D_MADCTL_MH 0x04 47 48 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe, 49 struct drm_crtc_state *crtc_state, 50 struct drm_plane_state *plane_state) 51 { 52 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); 53 struct mipi_dbi *dbi = &dbidev->dbi; 54 u8 addr_mode; 55 int ret, idx; 56 57 if (!drm_dev_enter(pipe->crtc.dev, &idx)) 58 return; 59 60 DRM_DEBUG_KMS("\n"); 61 62 ret = mipi_dbi_poweron_conditional_reset(dbidev); 63 if (ret < 0) 64 goto out_exit; 65 if (ret == 1) 66 goto out_enable; 67 68 /* setextc */ 69 mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57); 70 msleep(150); 71 72 /* setRGB which also enables SDO */ 73 mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06); 74 75 /* -1.52V */ 76 mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25); 77 78 /* Normal mode 70Hz, Idle mode 55 Hz */ 79 mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68); 80 81 /* Set Panel - BGR, Gate direction swapped */ 82 mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05); 83 84 mipi_dbi_command(dbi, HX8357D_SETPOWER, 85 0x00, /* Not deep standby */ 86 0x15, /* BT */ 87 0x1C, /* VSPR */ 88 0x1C, /* VSNR */ 89 0x83, /* AP */ 90 0xAA); /* FS */ 91 92 mipi_dbi_command(dbi, HX8357D_SETSTBA, 93 0x50, /* OPON normal */ 94 0x50, /* OPON idle */ 95 0x01, /* STBA */ 96 0x3C, /* STBA */ 97 0x1E, /* STBA */ 98 0x08); /* GEN */ 99 100 mipi_dbi_command(dbi, HX8357D_SETCYC, 101 0x02, /* NW 0x02 */ 102 0x40, /* RTN */ 103 0x00, /* DIV */ 104 0x2A, /* DUM */ 105 0x2A, /* DUM */ 106 0x0D, /* GDON */ 107 0x78); /* GDOFF */ 108 109 mipi_dbi_command(dbi, HX8357D_SETGAMMA, 110 0x02, 111 0x0A, 112 0x11, 113 0x1d, 114 0x23, 115 0x35, 116 0x41, 117 0x4b, 118 0x4b, 119 0x42, 120 0x3A, 121 0x27, 122 0x1B, 123 0x08, 124 0x09, 125 0x03, 126 0x02, 127 0x0A, 128 0x11, 129 0x1d, 130 0x23, 131 0x35, 132 0x41, 133 0x4b, 134 0x4b, 135 0x42, 136 0x3A, 137 0x27, 138 0x1B, 139 0x08, 140 0x09, 141 0x03, 142 0x00, 143 0x01); 144 145 /* 16 bit */ 146 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 147 MIPI_DCS_PIXEL_FMT_16BIT); 148 149 /* TE off */ 150 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00); 151 152 /* tear line */ 153 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02); 154 155 /* Exit Sleep */ 156 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); 157 msleep(150); 158 159 /* display on */ 160 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); 161 usleep_range(5000, 7000); 162 163 out_enable: 164 switch (dbidev->rotation) { 165 default: 166 addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY; 167 break; 168 case 90: 169 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY; 170 break; 171 case 180: 172 addr_mode = 0; 173 break; 174 case 270: 175 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX; 176 break; 177 } 178 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); 179 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state); 180 out_exit: 181 drm_dev_exit(idx); 182 } 183 184 static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = { 185 DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable), 186 }; 187 188 static const struct drm_display_mode yx350hv15_mode = { 189 DRM_SIMPLE_MODE(320, 480, 60, 75), 190 }; 191 192 DEFINE_DRM_GEM_DMA_FOPS(hx8357d_fops); 193 194 static const struct drm_driver hx8357d_driver = { 195 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 196 .fops = &hx8357d_fops, 197 DRM_GEM_DMA_DRIVER_OPS_VMAP, 198 DRM_FBDEV_DMA_DRIVER_OPS, 199 .debugfs_init = mipi_dbi_debugfs_init, 200 .name = "hx8357d", 201 .desc = "HX8357D", 202 .date = "20181023", 203 .major = 1, 204 .minor = 0, 205 }; 206 207 static const struct of_device_id hx8357d_of_match[] = { 208 { .compatible = "adafruit,yx350hv15" }, 209 { } 210 }; 211 MODULE_DEVICE_TABLE(of, hx8357d_of_match); 212 213 static const struct spi_device_id hx8357d_id[] = { 214 { "yx350hv15", 0 }, 215 { } 216 }; 217 MODULE_DEVICE_TABLE(spi, hx8357d_id); 218 219 static int hx8357d_probe(struct spi_device *spi) 220 { 221 struct device *dev = &spi->dev; 222 struct mipi_dbi_dev *dbidev; 223 struct drm_device *drm; 224 struct gpio_desc *dc; 225 u32 rotation = 0; 226 int ret; 227 228 dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver, 229 struct mipi_dbi_dev, drm); 230 if (IS_ERR(dbidev)) 231 return PTR_ERR(dbidev); 232 233 drm = &dbidev->drm; 234 235 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW); 236 if (IS_ERR(dc)) 237 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n"); 238 239 dbidev->backlight = devm_of_find_backlight(dev); 240 if (IS_ERR(dbidev->backlight)) 241 return PTR_ERR(dbidev->backlight); 242 243 device_property_read_u32(dev, "rotation", &rotation); 244 245 ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc); 246 if (ret) 247 return ret; 248 249 ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation); 250 if (ret) 251 return ret; 252 253 drm_mode_config_reset(drm); 254 255 ret = drm_dev_register(drm, 0); 256 if (ret) 257 return ret; 258 259 spi_set_drvdata(spi, drm); 260 261 drm_client_setup(drm, NULL); 262 263 return 0; 264 } 265 266 static void hx8357d_remove(struct spi_device *spi) 267 { 268 struct drm_device *drm = spi_get_drvdata(spi); 269 270 drm_dev_unplug(drm); 271 drm_atomic_helper_shutdown(drm); 272 } 273 274 static void hx8357d_shutdown(struct spi_device *spi) 275 { 276 drm_atomic_helper_shutdown(spi_get_drvdata(spi)); 277 } 278 279 static struct spi_driver hx8357d_spi_driver = { 280 .driver = { 281 .name = "hx8357d", 282 .of_match_table = hx8357d_of_match, 283 }, 284 .id_table = hx8357d_id, 285 .probe = hx8357d_probe, 286 .remove = hx8357d_remove, 287 .shutdown = hx8357d_shutdown, 288 }; 289 module_spi_driver(hx8357d_spi_driver); 290 291 MODULE_DESCRIPTION("HX8357D DRM driver"); 292 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 293 MODULE_LICENSE("GPL"); 294