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 <david@lechnology.com>
   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_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
  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         .enable         = st7735r_pipe_enable,
 137         .disable        = mipi_dbi_pipe_disable,
 138         .update         = mipi_dbi_pipe_update,
 139         .prepare_fb     = drm_gem_simple_display_pipe_prepare_fb,
 140 };
 141
 142 static const struct st7735r_cfg jd_t18003_t01_cfg = {
 143         .mode           = { DRM_SIMPLE_MODE(128, 160, 28, 35) },
 144         /* Cannot read from Adafruit 1.8" display via SPI */
 145         .write_only     = true,
 146 };
 147
 148 static const struct st7735r_cfg rh128128t_cfg = {
 149         .mode           = { DRM_SIMPLE_MODE(128, 128, 25, 26) },
 150         .left_offset    = 2,
 151         .top_offset     = 3,
 152         .rgb            = true,
 153 };
 154
 155 DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
 156
 157 static const struct drm_driver st7735r_driver = {
 158         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 159         .fops                   = &st7735r_fops,
 160         DRM_GEM_CMA_DRIVER_OPS_VMAP,
 161         .debugfs_init           = mipi_dbi_debugfs_init,
 162         .name                   = "st7735r",
 163         .desc                   = "Sitronix ST7735R",
 164         .date                   = "20171128",
 165         .major                  = 1,
 166         .minor                  = 0,
 167 };
 168
 169 static const struct of_device_id st7735r_of_match[] = {
 170         { .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg },
 171         { .compatible = "okaya,rh128128t", .data = &rh128128t_cfg },
 172         { },
 173 };
 174 MODULE_DEVICE_TABLE(of, st7735r_of_match);
 175
 176 static const struct spi_device_id st7735r_id[] = {
 177         { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },
 178         { },
 179 };
 180 MODULE_DEVICE_TABLE(spi, st7735r_id);
 181
 182 static int st7735r_probe(struct spi_device *spi)
 183 {
 184         struct device *dev = &spi->dev;
 185         const struct st7735r_cfg *cfg;
 186         struct mipi_dbi_dev *dbidev;
 187         struct st7735r_priv *priv;
 188         struct drm_device *drm;
 189         struct mipi_dbi *dbi;
 190         struct gpio_desc *dc;
 191         u32 rotation = 0;
 192         int ret;
 193
 194         cfg = device_get_match_data(&spi->dev);
 195         if (!cfg)
 196                 cfg = (void *)spi_get_device_id(spi)->driver_data;
 197
 198         priv = devm_drm_dev_alloc(dev, &st7735r_driver,
 199                                   struct st7735r_priv, dbidev.drm);
 200         if (IS_ERR(priv))
 201                 return PTR_ERR(priv);
 202
 203         dbidev = &priv->dbidev;
 204         priv->cfg = cfg;
 205
 206         dbi = &dbidev->dbi;
 207         drm = &dbidev->drm;
 208
 209         dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 210         if (IS_ERR(dbi->reset)) {
 211                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 212                 return PTR_ERR(dbi->reset);
 213         }
 214
 215         dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
 216         if (IS_ERR(dc)) {
 217                 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
 218                 return PTR_ERR(dc);
 219         }
 220
 221         dbidev->backlight = devm_of_find_backlight(dev);
 222         if (IS_ERR(dbidev->backlight))
 223                 return PTR_ERR(dbidev->backlight);
 224
 225         device_property_read_u32(dev, "rotation", &rotation);
 226
 227         ret = mipi_dbi_spi_init(spi, dbi, dc);
 228         if (ret)
 229                 return ret;
 230
 231         if (cfg->write_only)
 232                 dbi->read_commands = NULL;
 233
 234         dbidev->left_offset = cfg->left_offset;
 235         dbidev->top_offset = cfg->top_offset;
 236
 237         ret = mipi_dbi_dev_init(dbidev, &st7735r_pipe_funcs, &cfg->mode,
 238                                 rotation);
 239         if (ret)
 240                 return ret;
 241
 242         drm_mode_config_reset(drm);
 243
 244         ret = drm_dev_register(drm, 0);
 245         if (ret)
 246                 return ret;
 247
 248         spi_set_drvdata(spi, drm);
 249
 250         drm_fbdev_generic_setup(drm, 0);
 251
 252         return 0;
 253 }
 254
 255 static int st7735r_remove(struct spi_device *spi)
 256 {
 257         struct drm_device *drm = spi_get_drvdata(spi);
 258
 259         drm_dev_unplug(drm);
 260         drm_atomic_helper_shutdown(drm);
 261
 262         return 0;
 263 }
 264
 265 static void st7735r_shutdown(struct spi_device *spi)
 266 {
 267         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 268 }
 269
 270 static struct spi_driver st7735r_spi_driver = {
 271         .driver = {
 272                 .name = "st7735r",
 273                 .of_match_table = st7735r_of_match,
 274         },
 275         .id_table = st7735r_id,
 276         .probe = st7735r_probe,
 277         .remove = st7735r_remove,
 278         .shutdown = st7735r_shutdown,
 279 };
 280 module_spi_driver(st7735r_spi_driver);
 281
 282 MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
 283 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 284 MODULE_LICENSE("GPL");