drivers/gpu/drm/tinydrm/mi0283qt.c

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