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