drivers/gpu/drm/tiny/st7735r.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * DRM driver for display panels connected to a Sitronix ST7715R or ST7735R
   4  * display controller in SPI mode.
   5  *
   6  * Copyright 2017 David Lechner <[email protected]>
   7  * Copyright (C) 2019 Glider bvba
   8  */
   9
  10 #include <linux/backlight.h>
  11 #include <linux/delay.h>
  12 #include <linux/dma-buf.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/property.h>
  16 #include <linux/spi/spi.h>
  17 #include <video/mipi_display.h>
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_drv.h>
  21 #include <drm/drm_fbdev_generic.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
  27 #define ST7735R_FRMCTR1         0xb1
  28 #define ST7735R_FRMCTR2         0xb2
  29 #define ST7735R_FRMCTR3         0xb3
  30 #define ST7735R_INVCTR          0xb4
  31 #define ST7735R_PWCTR1          0xc0
  32 #define ST7735R_PWCTR2          0xc1
  33 #define ST7735R_PWCTR3          0xc2
  34 #define ST7735R_PWCTR4          0xc3
  35 #define ST7735R_PWCTR5          0xc4
  36 #define ST7735R_VMCTR1          0xc5
  37 #define ST7735R_GAMCTRP1        0xe0
  38 #define ST7735R_GAMCTRN1        0xe1
  39
  40 #define ST7735R_MY      BIT(7)
  41 #define ST7735R_MX      BIT(6)
  42 #define ST7735R_MV      BIT(5)
  43 #define ST7735R_RGB     BIT(3)
  44
  45 struct st7735r_cfg {
  46         const struct drm_display_mode mode;
  47         unsigned int left_offset;
  48         unsigned int top_offset;
  49         unsigned int write_only:1;
  50         unsigned int rgb:1;             /* RGB (vs. BGR) */
  51 };
  52
  53 struct st7735r_priv {
  54         struct mipi_dbi_dev dbidev;     /* Must be first for .release() */
  55         const struct st7735r_cfg *cfg;
  56 };
  57
  58 static void st7735r_pipe_enable(struct drm_simple_display_pipe *pipe,
  59                                 struct drm_crtc_state *crtc_state,
  60                                 struct drm_plane_state *plane_state)
  61 {
  62         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
  63         struct st7735r_priv *priv = container_of(dbidev, struct st7735r_priv,
  64                                                  dbidev);
  65         struct mipi_dbi *dbi = &dbidev->dbi;
  66         int ret, idx;
  67         u8 addr_mode;
  68
  69         if (!drm_dev_enter(pipe->crtc.dev, &idx))
  70                 return;
  71
  72         DRM_DEBUG_KMS("\n");
  73
  74         ret = mipi_dbi_poweron_reset(dbidev);
  75         if (ret)
  76                 goto out_exit;
  77
  78         msleep(150);
  79
  80         mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
  81         msleep(500);
  82
  83         mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
  84         mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
  85         mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
  86                          0x2d);
  87         mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07);
  88         mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
  89         mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5);
  90         mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00);
  91         mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a);
  92         mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee);
  93         mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e);
  94         mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
  95         switch (dbidev->rotation) {
  96         default:
  97                 addr_mode = ST7735R_MX | ST7735R_MY;
  98                 break;
  99         case 90:
 100                 addr_mode = ST7735R_MX | ST7735R_MV;
 101                 break;
 102         case 180:
 103                 addr_mode = 0;
 104                 break;
 105         case 270:
 106                 addr_mode = ST7735R_MY | ST7735R_MV;
 107                 break;
 108         }
 109
 110         if (priv->cfg->rgb)
 111                 addr_mode |= ST7735R_RGB;
 112
 113         mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
 114         mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
 115                          MIPI_DCS_PIXEL_FMT_16BIT);
 116         mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37,
 117                          0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01,
 118                          0x03, 0x10);
 119         mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e,
 120                          0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00,
 121                          0x02, 0x10);
 122         mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
 123
 124         msleep(100);
 125
 126         mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
 127
 128         msleep(20);
 129
 130         mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
 131 out_exit:
 132         drm_dev_exit(idx);
 133 }
 134
 135 static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = {
 136         DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(st7735r_pipe_enable),
 137 };
 138
 139 static const struct st7735r_cfg jd_t18003_t01_cfg = {
 140         .mode           = { DRM_SIMPLE_MODE(128, 160, 28, 35) },
 141         /* Cannot read from Adafruit 1.8" display via SPI */
 142         .write_only     = true,
 143 };
 144
 145 static const struct st7735r_cfg rh128128t_cfg = {
 146         .mode           = { DRM_SIMPLE_MODE(128, 128, 25, 26) },
 147         .left_offset    = 2,
 148         .top_offset     = 3,
 149         .rgb            = true,
 150 };
 151
 152 DEFINE_DRM_GEM_DMA_FOPS(st7735r_fops);
 153
 154 static const struct drm_driver st7735r_driver = {
 155         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 156         .fops                   = &st7735r_fops,
 157         DRM_GEM_DMA_DRIVER_OPS_VMAP,
 158         .debugfs_init           = mipi_dbi_debugfs_init,
 159         .name                   = "st7735r",
 160         .desc                   = "Sitronix ST7735R",
 161         .date                   = "20171128",
 162         .major                  = 1,
 163         .minor                  = 0,
 164 };
 165
 166 static const struct of_device_id st7735r_of_match[] = {
 167         { .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg },
 168         { .compatible = "okaya,rh128128t", .data = &rh128128t_cfg },
 169         { },
 170 };
 171 MODULE_DEVICE_TABLE(of, st7735r_of_match);
 172
 173 static const struct spi_device_id st7735r_id[] = {
 174         { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },
 175         { "rh128128t", (uintptr_t)&rh128128t_cfg },
 176         { },
 177 };
 178 MODULE_DEVICE_TABLE(spi, st7735r_id);
 179
 180 static int st7735r_probe(struct spi_device *spi)
 181 {
 182         struct device *dev = &spi->dev;
 183         const struct st7735r_cfg *cfg;
 184         struct mipi_dbi_dev *dbidev;
 185         struct st7735r_priv *priv;
 186         struct drm_device *drm;
 187         struct mipi_dbi *dbi;
 188         struct gpio_desc *dc;
 189         u32 rotation = 0;
 190         int ret;
 191
 192         cfg = device_get_match_data(&spi->dev);
 193         if (!cfg)
 194                 cfg = (void *)spi_get_device_id(spi)->driver_data;
 195
 196         priv = devm_drm_dev_alloc(dev, &st7735r_driver,
 197                                   struct st7735r_priv, dbidev.drm);
 198         if (IS_ERR(priv))
 199                 return PTR_ERR(priv);
 200
 201         dbidev = &priv->dbidev;
 202         priv->cfg = cfg;
 203
 204         dbi = &dbidev->dbi;
 205         drm = &dbidev->drm;
 206
 207         dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 208         if (IS_ERR(dbi->reset))
 209                 return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
 210
 211         dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
 212         if (IS_ERR(dc))
 213                 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
 214
 215         dbidev->backlight = devm_of_find_backlight(dev);
 216         if (IS_ERR(dbidev->backlight))
 217                 return PTR_ERR(dbidev->backlight);
 218
 219         device_property_read_u32(dev, "rotation", &rotation);
 220
 221         ret = mipi_dbi_spi_init(spi, dbi, dc);
 222         if (ret)
 223                 return ret;
 224
 225         if (cfg->write_only)
 226                 dbi->read_commands = NULL;
 227
 228         dbidev->left_offset = cfg->left_offset;
 229         dbidev->top_offset = cfg->top_offset;
 230
 231         ret = mipi_dbi_dev_init(dbidev, &st7735r_pipe_funcs, &cfg->mode,
 232                                 rotation);
 233         if (ret)
 234                 return ret;
 235
 236         drm_mode_config_reset(drm);
 237
 238         ret = drm_dev_register(drm, 0);
 239         if (ret)
 240                 return ret;
 241
 242         spi_set_drvdata(spi, drm);
 243
 244         drm_fbdev_generic_setup(drm, 0);
 245
 246         return 0;
 247 }
 248
 249 static void st7735r_remove(struct spi_device *spi)
 250 {
 251         struct drm_device *drm = spi_get_drvdata(spi);
 252
 253         drm_dev_unplug(drm);
 254         drm_atomic_helper_shutdown(drm);
 255 }
 256
 257 static void st7735r_shutdown(struct spi_device *spi)
 258 {
 259         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 260 }
 261
 262 static struct spi_driver st7735r_spi_driver = {
 263         .driver = {
 264                 .name = "st7735r",
 265                 .of_match_table = st7735r_of_match,
 266         },
 267         .id_table = st7735r_id,
 268         .probe = st7735r_probe,
 269         .remove = st7735r_remove,
 270         .shutdown = st7735r_shutdown,
 271 };
 272 module_spi_driver(st7735r_spi_driver);
 273
 274 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
 275 MODULE_AUTHOR("David Lechner <[email protected]>");
 276 MODULE_LICENSE("GPL");