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_fbdev_generic.h> 21 #include <drm/drm_gem_atomic_helper.h> 22 #include <drm/drm_gem_dma_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 DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(yx240qv29_enable), 141 }; 142 143 static const struct drm_display_mode yx240qv29_mode = { 144 DRM_SIMPLE_MODE(240, 320, 37, 49), 145 }; 146 147 DEFINE_DRM_GEM_DMA_FOPS(ili9341_fops); 148 149 static const struct drm_driver ili9341_driver = { 150 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 151 .fops = &ili9341_fops, 152 DRM_GEM_DMA_DRIVER_OPS_VMAP, 153 .debugfs_init = mipi_dbi_debugfs_init, 154 .name = "ili9341", 155 .desc = "Ilitek ILI9341", 156 .date = "20180514", 157 .major = 1, 158 .minor = 0, 159 }; 160 161 static const struct of_device_id ili9341_of_match[] = { 162 { .compatible = "adafruit,yx240qv29" }, 163 { } 164 }; 165 MODULE_DEVICE_TABLE(of, ili9341_of_match); 166 167 static const struct spi_device_id ili9341_id[] = { 168 { "yx240qv29", 0 }, 169 { } 170 }; 171 MODULE_DEVICE_TABLE(spi, ili9341_id); 172 173 static int ili9341_probe(struct spi_device *spi) 174 { 175 struct device *dev = &spi->dev; 176 struct mipi_dbi_dev *dbidev; 177 struct drm_device *drm; 178 struct mipi_dbi *dbi; 179 struct gpio_desc *dc; 180 u32 rotation = 0; 181 int ret; 182 183 dbidev = devm_drm_dev_alloc(dev, &ili9341_driver, 184 struct mipi_dbi_dev, drm); 185 if (IS_ERR(dbidev)) 186 return PTR_ERR(dbidev); 187 188 dbi = &dbidev->dbi; 189 drm = &dbidev->drm; 190 191 dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 192 if (IS_ERR(dbi->reset)) 193 return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n"); 194 195 dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW); 196 if (IS_ERR(dc)) 197 return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n"); 198 199 dbidev->backlight = devm_of_find_backlight(dev); 200 if (IS_ERR(dbidev->backlight)) 201 return PTR_ERR(dbidev->backlight); 202 203 device_property_read_u32(dev, "rotation", &rotation); 204 205 ret = mipi_dbi_spi_init(spi, dbi, dc); 206 if (ret) 207 return ret; 208 209 ret = mipi_dbi_dev_init(dbidev, &ili9341_pipe_funcs, &yx240qv29_mode, rotation); 210 if (ret) 211 return ret; 212 213 drm_mode_config_reset(drm); 214 215 ret = drm_dev_register(drm, 0); 216 if (ret) 217 return ret; 218 219 spi_set_drvdata(spi, drm); 220 221 drm_fbdev_generic_setup(drm, 0); 222 223 return 0; 224 } 225 226 static void ili9341_remove(struct spi_device *spi) 227 { 228 struct drm_device *drm = spi_get_drvdata(spi); 229 230 drm_dev_unplug(drm); 231 drm_atomic_helper_shutdown(drm); 232 } 233 234 static void ili9341_shutdown(struct spi_device *spi) 235 { 236 drm_atomic_helper_shutdown(spi_get_drvdata(spi)); 237 } 238 239 static struct spi_driver ili9341_spi_driver = { 240 .driver = { 241 .name = "ili9341", 242 .of_match_table = ili9341_of_match, 243 }, 244 .id_table = ili9341_id, 245 .probe = ili9341_probe, 246 .remove = ili9341_remove, 247 .shutdown = ili9341_shutdown, 248 }; 249 module_spi_driver(ili9341_spi_driver); 250 251 MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver"); 252 MODULE_AUTHOR("David Lechner <david@lechnology.com>"); 253 MODULE_LICENSE("GPL"); 254