drivers/gpu/drm/tiny/ili9341.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * DRM driver for Ilitek ILI9341 panels
   4  *
   5  * Copyright 2018 David Lechner <david@lechnology.com>
   6  *
   7  * Based on mi0283qt.c:
   8  * Copyright 2016 Noralf Trønnes
   9  */
  10
  11 #include <linux/backlight.h>
  12 #include <linux/delay.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/property.h>
  16 #include <linux/spi/spi.h>
  17
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_drv.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_gem_cma_helper.h>
  22 #include <drm/drm_gem_framebuffer_helper.h>
  23 #include <drm/drm_managed.h>
  24 #include <drm/drm_mipi_dbi.h>
  25 #include <drm/drm_modeset_helper.h>
  26 #include <video/mipi_display.h>
  27
  28 #define ILI9341_FRMCTR1         0xb1
  29 #define ILI9341_DISCTRL         0xb6
  30 #define ILI9341_ETMOD           0xb7
  31
  32 #define ILI9341_PWCTRL1         0xc0
  33 #define ILI9341_PWCTRL2         0xc1
  34 #define ILI9341_VMCTRL1         0xc5
  35 #define ILI9341_VMCTRL2         0xc7
  36 #define ILI9341_PWCTRLA         0xcb
  37 #define ILI9341_PWCTRLB         0xcf
  38
  39 #define ILI9341_PGAMCTRL        0xe0
  40 #define ILI9341_NGAMCTRL        0xe1
  41 #define ILI9341_DTCTRLA         0xe8
  42 #define ILI9341_DTCTRLB         0xea
  43 #define ILI9341_PWRSEQ          0xed
  44
  45 #define ILI9341_EN3GAM          0xf2
  46 #define ILI9341_PUMPCTRL        0xf7
  47
  48 #define ILI9341_MADCTL_BGR      BIT(3)
  49 #define ILI9341_MADCTL_MV       BIT(5)
  50 #define ILI9341_MADCTL_MX       BIT(6)
  51 #define ILI9341_MADCTL_MY       BIT(7)
  52
  53 static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
  54                              struct drm_crtc_state *crtc_state,
  55                              struct drm_plane_state *plane_state)
  56 {
  57         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
  58         struct mipi_dbi *dbi = &dbidev->dbi;
  59         u8 addr_mode;
  60         int ret, idx;
  61
  62         if (!drm_dev_enter(pipe->crtc.dev, &idx))
  63                 return;
  64
  65         DRM_DEBUG_KMS("\n");
  66
  67         ret = mipi_dbi_poweron_conditional_reset(dbidev);
  68         if (ret < 0)
  69                 goto out_exit;
  70         if (ret == 1)
  71                 goto out_enable;
  72
  73         mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
  74
  75         mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);
  76         mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
  77         mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);
  78         mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
  79         mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
  80         mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
  81
  82         /* Power Control */
  83         mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x23);
  84         mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x10);
  85         /* VCOM */
  86         mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x3e, 0x28);
  87         mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0x86);
  88
  89         /* Memory Access Control */
  90         mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
  91
  92         /* Frame Rate */
  93         mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
  94
  95         /* Gamma */
  96         mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x00);
  97         mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
  98         mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
  99                          0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
 100                          0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
 101         mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
 102                          0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
 103                          0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
 104
 105         /* DDRAM */
 106         mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
 107
 108         /* Display */
 109         mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);
 110         mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
 111         msleep(100);
 112
 113         mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
 114         msleep(100);
 115
 116 out_enable:
 117         switch (dbidev->rotation) {
 118         default:
 119                 addr_mode = ILI9341_MADCTL_MX;
 120                 break;
 121         case 90:
 122                 addr_mode = ILI9341_MADCTL_MV;
 123                 break;
 124         case 180:
 125                 addr_mode = ILI9341_MADCTL_MY;
 126                 break;
 127         case 270:
 128                 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
 129                             ILI9341_MADCTL_MX;
 130                 break;
 131         }
 132         addr_mode |= ILI9341_MADCTL_BGR;
 133         mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
 134         mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
 135 out_exit:
 136         drm_dev_exit(idx);
 137 }
 138
 139 static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = {
 140         .enable = yx240qv29_enable,
 141         .disable = mipi_dbi_pipe_disable,
 142         .update = mipi_dbi_pipe_update,
 143         .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
 144 };
 145
 146 static const struct drm_display_mode yx240qv29_mode = {
 147         DRM_SIMPLE_MODE(240, 320, 37, 49),
 148 };
 149
 150 DEFINE_DRM_GEM_CMA_FOPS(ili9341_fops);
 151
 152 static const struct drm_driver ili9341_driver = {
 153         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 154         .fops                   = &ili9341_fops,
 155         DRM_GEM_CMA_DRIVER_OPS_VMAP,
 156         .debugfs_init           = mipi_dbi_debugfs_init,
 157         .name                   = "ili9341",
 158         .desc                   = "Ilitek ILI9341",
 159         .date                   = "20180514",
 160         .major                  = 1,
 161         .minor                  = 0,
 162 };
 163
 164 static const struct of_device_id ili9341_of_match[] = {
 165         { .compatible = "adafruit,yx240qv29" },
 166         { }
 167 };
 168 MODULE_DEVICE_TABLE(of, ili9341_of_match);
 169
 170 static const struct spi_device_id ili9341_id[] = {
 171         { "yx240qv29", 0 },
 172         { }
 173 };
 174 MODULE_DEVICE_TABLE(spi, ili9341_id);
 175
 176 static int ili9341_probe(struct spi_device *spi)
 177 {
 178         struct device *dev = &spi->dev;
 179         struct mipi_dbi_dev *dbidev;
 180         struct drm_device *drm;
 181         struct mipi_dbi *dbi;
 182         struct gpio_desc *dc;
 183         u32 rotation = 0;
 184         int ret;
 185
 186         dbidev = devm_drm_dev_alloc(dev, &ili9341_driver,
 187                                     struct mipi_dbi_dev, drm);
 188         if (IS_ERR(dbidev))
 189                 return PTR_ERR(dbidev);
 190
 191         dbi = &dbidev->dbi;
 192         drm = &dbidev->drm;
 193
 194         dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 195         if (IS_ERR(dbi->reset)) {
 196                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 197                 return PTR_ERR(dbi->reset);
 198         }
 199
 200         dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
 201         if (IS_ERR(dc)) {
 202                 DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
 203                 return PTR_ERR(dc);
 204         }
 205
 206         dbidev->backlight = devm_of_find_backlight(dev);
 207         if (IS_ERR(dbidev->backlight))
 208                 return PTR_ERR(dbidev->backlight);
 209
 210         device_property_read_u32(dev, "rotation", &rotation);
 211
 212         ret = mipi_dbi_spi_init(spi, dbi, dc);
 213         if (ret)
 214                 return ret;
 215
 216         ret = mipi_dbi_dev_init(dbidev, &ili9341_pipe_funcs, &yx240qv29_mode, rotation);
 217         if (ret)
 218                 return ret;
 219
 220         drm_mode_config_reset(drm);
 221
 222         ret = drm_dev_register(drm, 0);
 223         if (ret)
 224                 return ret;
 225
 226         spi_set_drvdata(spi, drm);
 227
 228         drm_fbdev_generic_setup(drm, 0);
 229
 230         return 0;
 231 }
 232
 233 static int ili9341_remove(struct spi_device *spi)
 234 {
 235         struct drm_device *drm = spi_get_drvdata(spi);
 236
 237         drm_dev_unplug(drm);
 238         drm_atomic_helper_shutdown(drm);
 239
 240         return 0;
 241 }
 242
 243 static void ili9341_shutdown(struct spi_device *spi)
 244 {
 245         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 246 }
 247
 248 static struct spi_driver ili9341_spi_driver = {
 249         .driver = {
 250                 .name = "ili9341",
 251                 .of_match_table = ili9341_of_match,
 252         },
 253         .id_table = ili9341_id,
 254         .probe = ili9341_probe,
 255         .remove = ili9341_remove,
 256         .shutdown = ili9341_shutdown,
 257 };
 258 module_spi_driver(ili9341_spi_driver);
 259
 260 MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");
 261 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 262 MODULE_LICENSE("GPL");