drivers/gpu/drm/tiny/ili9225.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * DRM driver for Ilitek ILI9225 panels
   4  *
   5  * Copyright 2017 David Lechner <david@lechnology.com>
   6  *
   7  * Some code copied from mipi-dbi.c
   8  * Copyright 2016 Noralf Trønnes
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/dma-buf.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/property.h>
  16 #include <linux/spi/spi.h>
  17 #include <video/mipi_display.h>
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_damage_helper.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fb_cma_helper.h>
  23 #include <drm/drm_fb_helper.h>
  24 #include <drm/drm_fourcc.h>
  25 #include <drm/drm_gem_atomic_helper.h>
  26 #include <drm/drm_gem_cma_helper.h>
  27 #include <drm/drm_managed.h>
  28 #include <drm/drm_mipi_dbi.h>
  29 #include <drm/drm_rect.h>
  30
  31 #define ILI9225_DRIVER_READ_CODE        0x00
  32 #define ILI9225_DRIVER_OUTPUT_CONTROL   0x01
  33 #define ILI9225_LCD_AC_DRIVING_CONTROL  0x02
  34 #define ILI9225_ENTRY_MODE              0x03
  35 #define ILI9225_DISPLAY_CONTROL_1       0x07
  36 #define ILI9225_BLANK_PERIOD_CONTROL_1  0x08
  37 #define ILI9225_FRAME_CYCLE_CONTROL     0x0b
  38 #define ILI9225_INTERFACE_CONTROL       0x0c
  39 #define ILI9225_OSCILLATION_CONTROL     0x0f
  40 #define ILI9225_POWER_CONTROL_1         0x10
  41 #define ILI9225_POWER_CONTROL_2         0x11
  42 #define ILI9225_POWER_CONTROL_3         0x12
  43 #define ILI9225_POWER_CONTROL_4         0x13
  44 #define ILI9225_POWER_CONTROL_5         0x14
  45 #define ILI9225_VCI_RECYCLING           0x15
  46 #define ILI9225_RAM_ADDRESS_SET_1       0x20
  47 #define ILI9225_RAM_ADDRESS_SET_2       0x21
  48 #define ILI9225_WRITE_DATA_TO_GRAM      0x22
  49 #define ILI9225_SOFTWARE_RESET          0x28
  50 #define ILI9225_GATE_SCAN_CONTROL       0x30
  51 #define ILI9225_VERTICAL_SCROLL_1       0x31
  52 #define ILI9225_VERTICAL_SCROLL_2       0x32
  53 #define ILI9225_VERTICAL_SCROLL_3       0x33
  54 #define ILI9225_PARTIAL_DRIVING_POS_1   0x34
  55 #define ILI9225_PARTIAL_DRIVING_POS_2   0x35
  56 #define ILI9225_HORIZ_WINDOW_ADDR_1     0x36
  57 #define ILI9225_HORIZ_WINDOW_ADDR_2     0x37
  58 #define ILI9225_VERT_WINDOW_ADDR_1      0x38
  59 #define ILI9225_VERT_WINDOW_ADDR_2      0x39
  60 #define ILI9225_GAMMA_CONTROL_1         0x50
  61 #define ILI9225_GAMMA_CONTROL_2         0x51
  62 #define ILI9225_GAMMA_CONTROL_3         0x52
  63 #define ILI9225_GAMMA_CONTROL_4         0x53
  64 #define ILI9225_GAMMA_CONTROL_5         0x54
  65 #define ILI9225_GAMMA_CONTROL_6         0x55
  66 #define ILI9225_GAMMA_CONTROL_7         0x56
  67 #define ILI9225_GAMMA_CONTROL_8         0x57
  68 #define ILI9225_GAMMA_CONTROL_9         0x58
  69 #define ILI9225_GAMMA_CONTROL_10        0x59
  70
  71 static inline int ili9225_command(struct mipi_dbi *dbi, u8 cmd, u16 data)
  72 {
  73         u8 par[2] = { data >> 8, data & 0xff };
  74
  75         return mipi_dbi_command_buf(dbi, cmd, par, 2);
  76 }
  77
  78 static void ili9225_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
  79 {
  80         struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
  81         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev);
  82         unsigned int height = rect->y2 - rect->y1;
  83         unsigned int width = rect->x2 - rect->x1;
  84         struct mipi_dbi *dbi = &dbidev->dbi;
  85         bool swap = dbi->swap_bytes;
  86         u16 x_start, y_start;
  87         u16 x1, x2, y1, y2;
  88         int idx, ret = 0;
  89         bool full;
  90         void *tr;
  91
  92         if (!drm_dev_enter(fb->dev, &idx))
  93                 return;
  94
  95         full = width == fb->width && height == fb->height;
  96
  97         DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
  98
  99         if (!dbi->dc || !full || swap ||
 100             fb->format->format == DRM_FORMAT_XRGB8888) {
 101                 tr = dbidev->tx_buf;
 102                 ret = mipi_dbi_buf_copy(dbidev->tx_buf, fb, rect, swap);
 103                 if (ret)
 104                         goto err_msg;
 105         } else {
 106                 tr = cma_obj->vaddr;
 107         }
 108
 109         switch (dbidev->rotation) {
 110         default:
 111                 x1 = rect->x1;
 112                 x2 = rect->x2 - 1;
 113                 y1 = rect->y1;
 114                 y2 = rect->y2 - 1;
 115                 x_start = x1;
 116                 y_start = y1;
 117                 break;
 118         case 90:
 119                 x1 = rect->y1;
 120                 x2 = rect->y2 - 1;
 121                 y1 = fb->width - rect->x2;
 122                 y2 = fb->width - rect->x1 - 1;
 123                 x_start = x1;
 124                 y_start = y2;
 125                 break;
 126         case 180:
 127                 x1 = fb->width - rect->x2;
 128                 x2 = fb->width - rect->x1 - 1;
 129                 y1 = fb->height - rect->y2;
 130                 y2 = fb->height - rect->y1 - 1;
 131                 x_start = x2;
 132                 y_start = y2;
 133                 break;
 134         case 270:
 135                 x1 = fb->height - rect->y2;
 136                 x2 = fb->height - rect->y1 - 1;
 137                 y1 = rect->x1;
 138                 y2 = rect->x2 - 1;
 139                 x_start = x2;
 140                 y_start = y1;
 141                 break;
 142         }
 143
 144         ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_1, x2);
 145         ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_2, x1);
 146         ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_1, y2);
 147         ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_2, y1);
 148
 149         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, x_start);
 150         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, y_start);
 151
 152         ret = mipi_dbi_command_buf(dbi, ILI9225_WRITE_DATA_TO_GRAM, tr,
 153                                    width * height * 2);
 154 err_msg:
 155         if (ret)
 156                 dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
 157
 158         drm_dev_exit(idx);
 159 }
 160
 161 static void ili9225_pipe_update(struct drm_simple_display_pipe *pipe,
 162                                 struct drm_plane_state *old_state)
 163 {
 164         struct drm_plane_state *state = pipe->plane.state;
 165         struct drm_rect rect;
 166
 167         if (!pipe->crtc.state->active)
 168                 return;
 169
 170         if (drm_atomic_helper_damage_merged(old_state, state, &rect))
 171                 ili9225_fb_dirty(state->fb, &rect);
 172 }
 173
 174 static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
 175                                 struct drm_crtc_state *crtc_state,
 176                                 struct drm_plane_state *plane_state)
 177 {
 178         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 179         struct drm_framebuffer *fb = plane_state->fb;
 180         struct device *dev = pipe->crtc.dev->dev;
 181         struct mipi_dbi *dbi = &dbidev->dbi;
 182         struct drm_rect rect = {
 183                 .x1 = 0,
 184                 .x2 = fb->width,
 185                 .y1 = 0,
 186                 .y2 = fb->height,
 187         };
 188         int ret, idx;
 189         u8 am_id;
 190
 191         if (!drm_dev_enter(pipe->crtc.dev, &idx))
 192                 return;
 193
 194         DRM_DEBUG_KMS("\n");
 195
 196         mipi_dbi_hw_reset(dbi);
 197
 198         /*
 199          * There don't seem to be two example init sequences that match, so
 200          * using the one from the popular Arduino library for this display.
 201          * https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp
 202          */
 203
 204         ret = ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0000);
 205         if (ret) {
 206                 DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
 207                 goto out_exit;
 208         }
 209         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0000);
 210         ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x0000);
 211         ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x0000);
 212         ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x0000);
 213
 214         msleep(40);
 215
 216         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0018);
 217         ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x6121);
 218         ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x006f);
 219         ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x495f);
 220         ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0800);
 221
 222         msleep(10);
 223
 224         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x103b);
 225
 226         msleep(50);
 227
 228         switch (dbidev->rotation) {
 229         default:
 230                 am_id = 0x30;
 231                 break;
 232         case 90:
 233                 am_id = 0x18;
 234                 break;
 235         case 180:
 236                 am_id = 0x00;
 237                 break;
 238         case 270:
 239                 am_id = 0x28;
 240                 break;
 241         }
 242         ili9225_command(dbi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c);
 243         ili9225_command(dbi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100);
 244         ili9225_command(dbi, ILI9225_ENTRY_MODE, 0x1000 | am_id);
 245         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
 246         ili9225_command(dbi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808);
 247         ili9225_command(dbi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100);
 248         ili9225_command(dbi, ILI9225_INTERFACE_CONTROL, 0x0000);
 249         ili9225_command(dbi, ILI9225_OSCILLATION_CONTROL, 0x0d01);
 250         ili9225_command(dbi, ILI9225_VCI_RECYCLING, 0x0020);
 251         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, 0x0000);
 252         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, 0x0000);
 253
 254         ili9225_command(dbi, ILI9225_GATE_SCAN_CONTROL, 0x0000);
 255         ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_1, 0x00db);
 256         ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_2, 0x0000);
 257         ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_3, 0x0000);
 258         ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db);
 259         ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000);
 260
 261         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_1, 0x0000);
 262         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_2, 0x0808);
 263         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_3, 0x080a);
 264         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_4, 0x000a);
 265         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_5, 0x0a08);
 266         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_6, 0x0808);
 267         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_7, 0x0000);
 268         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_8, 0x0a00);
 269         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_9, 0x0710);
 270         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_10, 0x0710);
 271
 272         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0012);
 273
 274         msleep(50);
 275
 276         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
 277
 278         ili9225_fb_dirty(fb, &rect);
 279 out_exit:
 280         drm_dev_exit(idx);
 281 }
 282
 283 static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
 284 {
 285         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 286         struct mipi_dbi *dbi = &dbidev->dbi;
 287
 288         DRM_DEBUG_KMS("\n");
 289
 290         /*
 291          * This callback is not protected by drm_dev_enter/exit since we want to
 292          * turn off the display on regular driver unload. It's highly unlikely
 293          * that the underlying SPI controller is gone should this be called after
 294          * unplug.
 295          */
 296
 297         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
 298         msleep(50);
 299         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
 300         msleep(50);
 301         ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
 302 }
 303
 304 static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,
 305                                size_t num)
 306 {
 307         struct spi_device *spi = dbi->spi;
 308         unsigned int bpw = 8;
 309         u32 speed_hz;
 310         int ret;
 311
 312         gpiod_set_value_cansleep(dbi->dc, 0);
 313         speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
 314         ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1);
 315         if (ret || !num)
 316                 return ret;
 317
 318         if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes)
 319                 bpw = 16;
 320
 321         gpiod_set_value_cansleep(dbi->dc, 1);
 322         speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
 323
 324         return mipi_dbi_spi_transfer(spi, speed_hz, bpw, par, num);
 325 }
 326
 327 static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = {
 328         .enable         = ili9225_pipe_enable,
 329         .disable        = ili9225_pipe_disable,
 330         .update         = ili9225_pipe_update,
 331         .prepare_fb     = drm_gem_simple_display_pipe_prepare_fb,
 332 };
 333
 334 static const struct drm_display_mode ili9225_mode = {
 335         DRM_SIMPLE_MODE(176, 220, 35, 44),
 336 };
 337
 338 DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops);
 339
 340 static const struct drm_driver ili9225_driver = {
 341         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 342         .fops                   = &ili9225_fops,
 343         DRM_GEM_CMA_DRIVER_OPS_VMAP,
 344         .name                   = "ili9225",
 345         .desc                   = "Ilitek ILI9225",
 346         .date                   = "20171106",
 347         .major                  = 1,
 348         .minor                  = 0,
 349 };
 350
 351 static const struct of_device_id ili9225_of_match[] = {
 352         { .compatible = "vot,v220hf01a-t" },
 353         {},
 354 };
 355 MODULE_DEVICE_TABLE(of, ili9225_of_match);
 356
 357 static const struct spi_device_id ili9225_id[] = {
 358         { "v220hf01a-t", 0 },
 359         { },
 360 };
 361 MODULE_DEVICE_TABLE(spi, ili9225_id);
 362
 363 static int ili9225_probe(struct spi_device *spi)
 364 {
 365         struct device *dev = &spi->dev;
 366         struct mipi_dbi_dev *dbidev;
 367         struct drm_device *drm;
 368         struct mipi_dbi *dbi;
 369         struct gpio_desc *rs;
 370         u32 rotation = 0;
 371         int ret;
 372
 373         dbidev = devm_drm_dev_alloc(dev, &ili9225_driver,
 374                                     struct mipi_dbi_dev, drm);
 375         if (IS_ERR(dbidev))
 376                 return PTR_ERR(dbidev);
 377
 378         dbi = &dbidev->dbi;
 379         drm = &dbidev->drm;
 380
 381         dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 382         if (IS_ERR(dbi->reset))
 383                 return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n");
 384
 385         rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
 386         if (IS_ERR(rs))
 387                 return dev_err_probe(dev, PTR_ERR(rs), "Failed to get GPIO 'rs'\n");
 388
 389         device_property_read_u32(dev, "rotation", &rotation);
 390
 391         ret = mipi_dbi_spi_init(spi, dbi, rs);
 392         if (ret)
 393                 return ret;
 394
 395         /* override the command function set in  mipi_dbi_spi_init() */
 396         dbi->command = ili9225_dbi_command;
 397
 398         ret = mipi_dbi_dev_init(dbidev, &ili9225_pipe_funcs, &ili9225_mode, rotation);
 399         if (ret)
 400                 return ret;
 401
 402         drm_mode_config_reset(drm);
 403
 404         ret = drm_dev_register(drm, 0);
 405         if (ret)
 406                 return ret;
 407
 408         spi_set_drvdata(spi, drm);
 409
 410         drm_fbdev_generic_setup(drm, 0);
 411
 412         return 0;
 413 }
 414
 415 static int ili9225_remove(struct spi_device *spi)
 416 {
 417         struct drm_device *drm = spi_get_drvdata(spi);
 418
 419         drm_dev_unplug(drm);
 420         drm_atomic_helper_shutdown(drm);
 421
 422         return 0;
 423 }
 424
 425 static void ili9225_shutdown(struct spi_device *spi)
 426 {
 427         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 428 }
 429
 430 static struct spi_driver ili9225_spi_driver = {
 431         .driver = {
 432                 .name = "ili9225",
 433                 .owner = THIS_MODULE,
 434                 .of_match_table = ili9225_of_match,
 435         },
 436         .id_table = ili9225_id,
 437         .probe = ili9225_probe,
 438         .remove = ili9225_remove,
 439         .shutdown = ili9225_shutdown,
 440 };
 441 module_spi_driver(ili9225_spi_driver);
 442
 443 MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
 444 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 445 MODULE_LICENSE("GPL");