drivers/gpu/drm/tiny/mi0283qt.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * DRM driver for Multi-Inno MI0283QT panels
   4  *
   5  * Copyright 2016 Noralf Trønnes
   6  */
   7
   8 #include <linux/backlight.h>
   9 #include <linux/delay.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/module.h>
  12 #include <linux/property.h>
  13 #include <linux/regulator/consumer.h>
  14 #include <linux/spi/spi.h>
  15
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_drv.h>
  18 #include <drm/drm_fbdev_generic.h>
  19 #include <drm/drm_gem_atomic_helper.h>
  20 #include <drm/drm_gem_dma_helper.h>
  21 #include <drm/drm_managed.h>
  22 #include <drm/drm_mipi_dbi.h>
  23 #include <drm/drm_modeset_helper.h>
  24 #include <video/mipi_display.h>
  25
  26 #define ILI9341_FRMCTR1         0xb1
  27 #define ILI9341_DISCTRL         0xb6
  28 #define ILI9341_ETMOD           0xb7
  29
  30 #define ILI9341_PWCTRL1         0xc0
  31 #define ILI9341_PWCTRL2         0xc1
  32 #define ILI9341_VMCTRL1         0xc5
  33 #define ILI9341_VMCTRL2         0xc7
  34 #define ILI9341_PWCTRLA         0xcb
  35 #define ILI9341_PWCTRLB         0xcf
  36
  37 #define ILI9341_PGAMCTRL        0xe0
  38 #define ILI9341_NGAMCTRL        0xe1
  39 #define ILI9341_DTCTRLA         0xe8
  40 #define ILI9341_DTCTRLB         0xea
  41 #define ILI9341_PWRSEQ          0xed
  42
  43 #define ILI9341_EN3GAM          0xf2
  44 #define ILI9341_PUMPCTRL        0xf7
  45
  46 #define ILI9341_MADCTL_BGR      BIT(3)
  47 #define ILI9341_MADCTL_MV       BIT(5)
  48 #define ILI9341_MADCTL_MX       BIT(6)
  49 #define ILI9341_MADCTL_MY       BIT(7)
  50
  51 static void mi0283qt_enable(struct drm_simple_display_pipe *pipe,
  52                             struct drm_crtc_state *crtc_state,
  53                             struct drm_plane_state *plane_state)
  54 {
  55         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
  56         struct mipi_dbi *dbi = &dbidev->dbi;
  57         u8 addr_mode;
  58         int ret, idx;
  59
  60         if (!drm_dev_enter(pipe->crtc.dev, &idx))
  61                 return;
  62
  63         DRM_DEBUG_KMS("\n");
  64
  65         ret = mipi_dbi_poweron_conditional_reset(dbidev);
  66         if (ret < 0)
  67                 goto out_exit;
  68         if (ret == 1)
  69                 goto out_enable;
  70
  71         mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
  72
  73         mipi_dbi_command(dbi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
  74         mipi_dbi_command(dbi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
  75         mipi_dbi_command(dbi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
  76         mipi_dbi_command(dbi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
  77         mipi_dbi_command(dbi, ILI9341_PUMPCTRL, 0x20);
  78         mipi_dbi_command(dbi, ILI9341_DTCTRLB, 0x00, 0x00);
  79
  80         /* Power Control */
  81         mipi_dbi_command(dbi, ILI9341_PWCTRL1, 0x26);
  82         mipi_dbi_command(dbi, ILI9341_PWCTRL2, 0x11);
  83         /* VCOM */
  84         mipi_dbi_command(dbi, ILI9341_VMCTRL1, 0x35, 0x3e);
  85         mipi_dbi_command(dbi, ILI9341_VMCTRL2, 0xbe);
  86
  87         /* Memory Access Control */
  88         mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
  89
  90         /* Frame Rate */
  91         mipi_dbi_command(dbi, ILI9341_FRMCTR1, 0x00, 0x1b);
  92
  93         /* Gamma */
  94         mipi_dbi_command(dbi, ILI9341_EN3GAM, 0x08);
  95         mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
  96         mipi_dbi_command(dbi, ILI9341_PGAMCTRL,
  97                        0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
  98                        0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
  99         mipi_dbi_command(dbi, ILI9341_NGAMCTRL,
 100                        0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
 101                        0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
 102
 103         /* DDRAM */
 104         mipi_dbi_command(dbi, ILI9341_ETMOD, 0x07);
 105
 106         /* Display */
 107         mipi_dbi_command(dbi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
 108         mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
 109         msleep(100);
 110
 111         mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
 112         msleep(100);
 113
 114 out_enable:
 115         /* The PiTFT (ili9340) has a hardware reset circuit that
 116          * resets only on power-on and not on each reboot through
 117          * a gpio like the rpi-display does.
 118          * As a result, we need to always apply the rotation value
 119          * regardless of the display "on/off" state.
 120          */
 121         switch (dbidev->rotation) {
 122         default:
 123                 addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
 124                             ILI9341_MADCTL_MX;
 125                 break;
 126         case 90:
 127                 addr_mode = ILI9341_MADCTL_MY;
 128                 break;
 129         case 180:
 130                 addr_mode = ILI9341_MADCTL_MV;
 131                 break;
 132         case 270:
 133                 addr_mode = ILI9341_MADCTL_MX;
 134                 break;
 135         }
 136         addr_mode |= ILI9341_MADCTL_BGR;
 137         mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
 138         mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
 139 out_exit:
 140         drm_dev_exit(idx);
 141 }
 142
 143 static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
 144         DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(mi0283qt_enable),
 145 };
 146
 147 static const struct drm_display_mode mi0283qt_mode = {
 148         DRM_SIMPLE_MODE(320, 240, 58, 43),
 149 };
 150
 151 DEFINE_DRM_GEM_DMA_FOPS(mi0283qt_fops);
 152
 153 static const struct drm_driver mi0283qt_driver = {
 154         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 155         .fops                   = &mi0283qt_fops,
 156         DRM_GEM_DMA_DRIVER_OPS_VMAP,
 157         .debugfs_init           = mipi_dbi_debugfs_init,
 158         .name                   = "mi0283qt",
 159         .desc                   = "Multi-Inno MI0283QT",
 160         .date                   = "20160614",
 161         .major                  = 1,
 162         .minor                  = 0,
 163 };
 164
 165 static const struct of_device_id mi0283qt_of_match[] = {
 166         { .compatible = "multi-inno,mi0283qt" },
 167         {},
 168 };
 169 MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
 170
 171 static const struct spi_device_id mi0283qt_id[] = {
 172         { "mi0283qt", 0 },
 173         { },
 174 };
 175 MODULE_DEVICE_TABLE(spi, mi0283qt_id);
 176
 177 static int mi0283qt_probe(struct spi_device *spi)
 178 {
 179         struct device *dev = &spi->dev;
 180         struct mipi_dbi_dev *dbidev;
 181         struct drm_device *drm;
 182         struct mipi_dbi *dbi;
 183         struct gpio_desc *dc;
 184         u32 rotation = 0;
 185         int ret;
 186
 187         dbidev = devm_drm_dev_alloc(dev, &mi0283qt_driver,
 188                                     struct mipi_dbi_dev, drm);
 189         if (IS_ERR(dbidev))
 190                 return PTR_ERR(dbidev);
 191
 192         dbi = &dbidev->dbi;
 193         drm = &dbidev->drm;
 194
 195         dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 196         if (IS_ERR(dbi->reset))
 197                 return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
 198
 199         dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
 200         if (IS_ERR(dc))
 201                 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n");
 202
 203         dbidev->regulator = devm_regulator_get(dev, "power");
 204         if (IS_ERR(dbidev->regulator))
 205                 return PTR_ERR(dbidev->regulator);
 206
 207         dbidev->backlight = devm_of_find_backlight(dev);
 208         if (IS_ERR(dbidev->backlight))
 209                 return PTR_ERR(dbidev->backlight);
 210
 211         device_property_read_u32(dev, "rotation", &rotation);
 212
 213         ret = mipi_dbi_spi_init(spi, dbi, dc);
 214         if (ret)
 215                 return ret;
 216
 217         ret = mipi_dbi_dev_init(dbidev, &mi0283qt_pipe_funcs, &mi0283qt_mode, rotation);
 218         if (ret)
 219                 return ret;
 220
 221         drm_mode_config_reset(drm);
 222
 223         ret = drm_dev_register(drm, 0);
 224         if (ret)
 225                 return ret;
 226
 227         spi_set_drvdata(spi, drm);
 228
 229         drm_fbdev_generic_setup(drm, 0);
 230
 231         return 0;
 232 }
 233
 234 static void mi0283qt_remove(struct spi_device *spi)
 235 {
 236         struct drm_device *drm = spi_get_drvdata(spi);
 237
 238         drm_dev_unplug(drm);
 239         drm_atomic_helper_shutdown(drm);
 240 }
 241
 242 static void mi0283qt_shutdown(struct spi_device *spi)
 243 {
 244         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 245 }
 246
 247 static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
 248 {
 249         return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
 250 }
 251
 252 static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
 253 {
 254         drm_mode_config_helper_resume(dev_get_drvdata(dev));
 255
 256         return 0;
 257 }
 258
 259 static const struct dev_pm_ops mi0283qt_pm_ops = {
 260         SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
 261 };
 262
 263 static struct spi_driver mi0283qt_spi_driver = {
 264         .driver = {
 265                 .name = "mi0283qt",
 266                 .owner = THIS_MODULE,
 267                 .of_match_table = mi0283qt_of_match,
 268                 .pm = &mi0283qt_pm_ops,
 269         },
 270         .id_table = mi0283qt_id,
 271         .probe = mi0283qt_probe,
 272         .remove = mi0283qt_remove,
 273         .shutdown = mi0283qt_shutdown,
 274 };
 275 module_spi_driver(mi0283qt_spi_driver);
 276
 277 MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
 278 MODULE_AUTHOR("Noralf Trønnes");
 279 MODULE_LICENSE("GPL");