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_fbdev_dma.h> 22 #include <drm/drm_gem_atomic_helper.h> 23 #include <drm/drm_gem_dma_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 DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable), 185 }; 186 187 static const struct drm_display_mode yx350hv15_mode = { 188 DRM_SIMPLE_MODE(320, 480, 60, 75), 189 }; 190 191 DEFINE_DRM_GEM_DMA_FOPS(hx8357d_fops); 192 193 static const struct drm_driver hx8357d_driver = { 194 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 195 .fops = &hx8357d_fops, 196 DRM_GEM_DMA_DRIVER_OPS_VMAP, 197 .debugfs_init = mipi_dbi_debugfs_init, 198 .name = "hx8357d", 199 .desc = "HX8357D", 200 .date = "20181023", 201 .major = 1, 202 .minor = 0, 203 }; 204 205 static const struct of_device_id hx8357d_of_match[] = { 206 { .compatible = "adafruit,yx350hv15" }, 207 { } 208 }; 209 MODULE_DEVICE_TABLE(of, hx8357d_of_match); 210 211 static const struct spi_device_id hx8357d_id[] = { 212 { "yx350hv15", 0 }, 213 { } 214 }; 215 MODULE_DEVICE_TABLE(spi, hx8357d_id); 216 217 static int hx8357d_probe(struct spi_device *spi) 218 { 219 struct device *dev = &spi->dev; 220 struct mipi_dbi_dev *dbidev; 221 struct drm_device *drm; 222 struct gpio_desc *dc; 223 u32 rotation = 0; 224 int ret; 225 226 dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver, 227 struct mipi_dbi_dev, drm); 228 if (IS_ERR(dbidev)) 229 return PTR_ERR(dbidev); 230 231 drm = &dbidev->drm; 232 233 dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW); 234 if (IS_ERR(dc)) 235 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n"); 236 237 dbidev->backlight = devm_of_find_backlight(dev); 238 if (IS_ERR(dbidev->backlight)) 239 return PTR_ERR(dbidev->backlight); 240 241 device_property_read_u32(dev, "rotation", &rotation); 242 243 ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc); 244 if (ret) 245 return ret; 246 247 ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation); 248 if (ret) 249 return ret; 250 251 drm_mode_config_reset(drm); 252 253 ret = drm_dev_register(drm, 0); 254 if (ret) 255 return ret; 256 257 spi_set_drvdata(spi, drm); 258 259 drm_fbdev_dma_setup(drm, 0); 260 261 return 0; 262 } 263 264 static void hx8357d_remove(struct spi_device *spi) 265 { 266 struct drm_device *drm = spi_get_drvdata(spi); 267 268 drm_dev_unplug(drm); 269 drm_atomic_helper_shutdown(drm); 270 } 271 272 static void hx8357d_shutdown(struct spi_device *spi) 273 { 274 drm_atomic_helper_shutdown(spi_get_drvdata(spi)); 275 } 276 277 static struct spi_driver hx8357d_spi_driver = { 278 .driver = { 279 .name = "hx8357d", 280 .of_match_table = hx8357d_of_match, 281 }, 282 .id_table = hx8357d_id, 283 .probe = hx8357d_probe, 284 .remove = hx8357d_remove, 285 .shutdown = hx8357d_shutdown, 286 }; 287 module_spi_driver(hx8357d_spi_driver); 288 289 MODULE_DESCRIPTION("HX8357D DRM driver"); 290 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 291 MODULE_LICENSE("GPL"); 292