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 <[email protected]>
   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/clients/drm_client_setup.h>
  20 #include <drm/drm_atomic_helper.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         .major                  = 1,
 203         .minor                  = 0,
 204 };
 205
 206 static const struct of_device_id hx8357d_of_match[] = {
 207         { .compatible = "adafruit,yx350hv15" },
 208         { }
 209 };
 210 MODULE_DEVICE_TABLE(of, hx8357d_of_match);
 211
 212 static const struct spi_device_id hx8357d_id[] = {
 213         { "yx350hv15", 0 },
 214         { }
 215 };
 216 MODULE_DEVICE_TABLE(spi, hx8357d_id);
 217
 218 static int hx8357d_probe(struct spi_device *spi)
 219 {
 220         struct device *dev = &spi->dev;
 221         struct mipi_dbi_dev *dbidev;
 222         struct drm_device *drm;
 223         struct gpio_desc *dc;
 224         u32 rotation = 0;
 225         int ret;
 226
 227         dbidev = devm_drm_dev_alloc(dev, &hx8357d_driver,
 228                                     struct mipi_dbi_dev, drm);
 229         if (IS_ERR(dbidev))
 230                 return PTR_ERR(dbidev);
 231
 232         drm = &dbidev->drm;
 233
 234         dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
 235         if (IS_ERR(dc))
 236                 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
 237
 238         dbidev->backlight = devm_of_find_backlight(dev);
 239         if (IS_ERR(dbidev->backlight))
 240                 return PTR_ERR(dbidev->backlight);
 241
 242         device_property_read_u32(dev, "rotation", &rotation);
 243
 244         ret = mipi_dbi_spi_init(spi, &dbidev->dbi, dc);
 245         if (ret)
 246                 return ret;
 247
 248         ret = mipi_dbi_dev_init(dbidev, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation);
 249         if (ret)
 250                 return ret;
 251
 252         drm_mode_config_reset(drm);
 253
 254         ret = drm_dev_register(drm, 0);
 255         if (ret)
 256                 return ret;
 257
 258         spi_set_drvdata(spi, drm);
 259
 260         drm_client_setup(drm, NULL);
 261
 262         return 0;
 263 }
 264
 265 static void hx8357d_remove(struct spi_device *spi)
 266 {
 267         struct drm_device *drm = spi_get_drvdata(spi);
 268
 269         drm_dev_unplug(drm);
 270         drm_atomic_helper_shutdown(drm);
 271 }
 272
 273 static void hx8357d_shutdown(struct spi_device *spi)
 274 {
 275         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 276 }
 277
 278 static struct spi_driver hx8357d_spi_driver = {
 279         .driver = {
 280                 .name = "hx8357d",
 281                 .of_match_table = hx8357d_of_match,
 282         },
 283         .id_table = hx8357d_id,
 284         .probe = hx8357d_probe,
 285         .remove = hx8357d_remove,
 286         .shutdown = hx8357d_shutdown,
 287 };
 288 module_spi_driver(hx8357d_spi_driver);
 289
 290 MODULE_DESCRIPTION("HX8357D DRM driver");
 291 MODULE_AUTHOR("Eric Anholt <[email protected]>");
 292 MODULE_LICENSE("GPL");