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