drivers/gpu/drm/tiny/hx8357d.c

   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_atomic_helper.h>
  23 #include <drm/drm_gem_cma_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_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 const struct drm_driver hx8357d_driver = {
 197         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 198         .fops                   = &hx8357d_fops,
 199         DRM_GEM_CMA_DRIVER_OPS_VMAP,
 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");