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_drv.h> 21 #include <drm/drm_fb_helper.h> 22 #include <drm/drm_gem_cma_helper.h> 23 #include <drm/drm_gem_framebuffer_helper.h> 24 #include <drm/drm_managed.h> 25 #include <drm/drm_mipi_dbi.h> 26 #include <drm/drm_modeset_helper.h> 27 #include <video/mipi_display.h> 28 29 #define HX8357D_SETOSC 0xb0 30 #define HX8357D_SETPOWER 0xb1 31 #define HX8357D_SETRGB 0xb3 32 #define HX8357D_SETCYC 0xb3 33 #define HX8357D_SETCOM 0xb6 34 #define HX8357D_SETEXTC 0xb9 35 #define HX8357D_SETSTBA 0xc0 36 #define HX8357D_SETPANEL 0xcc 37 #define HX8357D_SETGAMMA 0xe0 38 39 #define HX8357D_MADCTL_MY 0x80 40 #define HX8357D_MADCTL_MX 0x40 41 #define HX8357D_MADCTL_MV 0x20 42 #define HX8357D_MADCTL_ML 0x10 43 #define HX8357D_MADCTL_RGB 0x00 44 #define HX8357D_MADCTL_BGR 0x08 45 #define HX8357D_MADCTL_MH 0x04 46 47 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe, 48 struct drm_crtc_state *crtc_state, 49 struct drm_plane_state *plane_state) 50 { 51 struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); 52 struct mipi_dbi *dbi = &dbidev->dbi; 53 u8 addr_mode; 54 int ret, idx; 55 56 if (!drm_dev_enter(pipe->crtc.dev, &idx)) 57 return; 58 59 DRM_DEBUG_KMS("\n"); 60 61 ret = mipi_dbi_poweron_conditional_reset(dbidev); 62 if (ret < 0) 63 goto out_exit; 64 if (ret == 1) 65 goto out_enable; 66 67 /* setextc */ 68 mipi_dbi_command(dbi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57); 69 msleep(150); 70 71 /* setRGB which also enables SDO */ 72 mipi_dbi_command(dbi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06); 73 74 /* -1.52V */ 75 mipi_dbi_command(dbi, HX8357D_SETCOM, 0x25); 76 77 /* Normal mode 70Hz, Idle mode 55 Hz */ 78 mipi_dbi_command(dbi, HX8357D_SETOSC, 0x68); 79 80 /* Set Panel - BGR, Gate direction swapped */ 81 mipi_dbi_command(dbi, HX8357D_SETPANEL, 0x05); 82 83 mipi_dbi_command(dbi, HX8357D_SETPOWER, 84 0x00, /* Not deep standby */ 85 0x15, /* BT */ 86 0x1C, /* VSPR */ 87 0x1C, /* VSNR */ 88 0x83, /* AP */ 89 0xAA); /* FS */ 90 91 mipi_dbi_command(dbi, HX8357D_SETSTBA, 92 0x50, /* OPON normal */ 93 0x50, /* OPON idle */ 94 0x01, /* STBA */ 95 0x3C, /* STBA */ 96 0x1E, /* STBA */ 97 0x08); /* GEN */ 98 99 mipi_dbi_command(dbi, HX8357D_SETCYC, 100 0x02, /* NW 0x02 */ 101 0x40, /* RTN */ 102 0x00, /* DIV */ 103 0x2A, /* DUM */ 104 0x2A, /* DUM */ 105 0x0D, /* GDON */ 106 0x78); /* GDOFF */ 107 108 mipi_dbi_command(dbi, HX8357D_SETGAMMA, 109 0x02, 110 0x0A, 111 0x11, 112 0x1d, 113 0x23, 114 0x35, 115 0x41, 116 0x4b, 117 0x4b, 118 0x42, 119 0x3A, 120 0x27, 121 0x1B, 122 0x08, 123 0x09, 124 0x03, 125 0x02, 126 0x0A, 127 0x11, 128 0x1d, 129 0x23, 130 0x35, 131 0x41, 132 0x4b, 133 0x4b, 134 0x42, 135 0x3A, 136 0x27, 137 0x1B, 138 0x08, 139 0x09, 140 0x03, 141 0x00, 142 0x01); 143 144 /* 16 bit */ 145 mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, 146 MIPI_DCS_PIXEL_FMT_16BIT); 147 148 /* TE off */ 149 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON, 0x00); 150 151 /* tear line */ 152 mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02); 153 154 /* Exit Sleep */ 155 mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); 156 msleep(150); 157 158 /* display on */ 159 mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); 160 usleep_range(5000, 7000); 161 162 out_enable: 163 switch (dbidev->rotation) { 164 default: 165 addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY; 166 break; 167 case 90: 168 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY; 169 break; 170 case 180: 171 addr_mode = 0; 172 break; 173 case 270: 174 addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX; 175 break; 176 } 177 mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); 178 mipi_dbi_enable_flush(dbidev, crtc_state, plane_state); 179 out_exit: 180 drm_dev_exit(idx); 181 } 182 183 static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = { 184 .enable = yx240qv29_enable, 185 .disable = mipi_dbi_pipe_disable, 186 .update = mipi_dbi_pipe_update, 187 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, 188 }; 189 190 static const struct drm_display_mode yx350hv15_mode = { 191 DRM_SIMPLE_MODE(320, 480, 60, 75), 192 }; 193 194 DEFINE_DRM_GEM_CMA_FOPS(hx8357d_fops); 195 196 static struct drm_driver hx8357d_driver = { 197 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 198 .fops = &hx8357d_fops, 199 DRM_GEM_CMA_VMAP_DRIVER_OPS, 200 .debugfs_init = mipi_dbi_debugfs_init, 201 .name = "hx8357d", 202 .desc = "HX8357D", 203 .date = "20181023", 204 .major = 1, 205 .minor = 0, 206 }; 207 208 static const struct of_device_id hx8357d_of_match[] = { 209 { .compatible = "adafruit,yx350hv15" }, 210 { } 211 }; 212 MODULE_DEVICE_TABLE(of, hx8357d_of_match); 213 214 static const struct spi_device_id hx8357d_id[] = { 215 { "yx350hv15", 0 }, 216 { } 217 }; 218 MODULE_DEVICE_TABLE(spi, hx8357d_id); 219 220 static int hx8357d_probe(struct spi_device *spi) 221 { 222 struct device *dev = &spi->dev; 223 struct mipi_dbi_dev *dbidev; 224 struct drm_device *drm; 225 struct gpio_desc *dc; 226 u32 rotation = 0; 227 int ret; 228 229 dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver, 230 struct mipi_dbi_dev, drm); 231 if (IS_ERR(dbidev)) 232 return PTR_ERR(dbidev); 233 234 drm = &dbidev->drm; 235 236 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW); 237 if (IS_ERR(dc)) { 238 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n"); 239 return PTR_ERR(dc); 240 } 241 242 dbidev->backlight = devm_of_find_backlight(dev); 243 if (IS_ERR(dbidev->backlight)) 244 return PTR_ERR(dbidev->backlight); 245 246 device_property_read_u32(dev, "rotation", &rotation); 247 248 ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc); 249 if (ret) 250 return ret; 251 252 ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation); 253 if (ret) 254 return ret; 255 256 drm_mode_config_reset(drm); 257 258 ret = drm_dev_register(drm, 0); 259 if (ret) 260 return ret; 261 262 spi_set_drvdata(spi, drm); 263 264 drm_fbdev_generic_setup(drm, 0); 265 266 return 0; 267 } 268 269 static int hx8357d_remove(struct spi_device *spi) 270 { 271 struct drm_device *drm = spi_get_drvdata(spi); 272 273 drm_dev_unplug(drm); 274 drm_atomic_helper_shutdown(drm); 275 276 return 0; 277 } 278 279 static void hx8357d_shutdown(struct spi_device *spi) 280 { 281 drm_atomic_helper_shutdown(spi_get_drvdata(spi)); 282 } 283 284 static struct spi_driver hx8357d_spi_driver = { 285 .driver = { 286 .name = "hx8357d", 287 .of_match_table = hx8357d_of_match, 288 }, 289 .id_table = hx8357d_id, 290 .probe = hx8357d_probe, 291 .remove = hx8357d_remove, 292 .shutdown = hx8357d_shutdown, 293 }; 294 module_spi_driver(hx8357d_spi_driver); 295 296 MODULE_DESCRIPTION("HX8357D DRM driver"); 297 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 298 MODULE_LICENSE("GPL"); 299