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_cma_helper.h>
  26 #include <drm/drm_gem_framebuffer_helper.h>
  27 #include <drm/drm_mipi_dbi.h>
  28 #include <drm/drm_rect.h>
  29 #include <drm/drm_vblank.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 (!dbidev->enabled)
  93                 return;
  94
  95         if (!drm_dev_enter(fb->dev, &idx))
  96                 return;
  97
  98         full = width == fb->width && height == fb->height;
  99
 100         DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
 101
 102         if (!dbi->dc || !full || swap ||
 103             fb->format->format == DRM_FORMAT_XRGB8888) {
 104                 tr = dbidev->tx_buf;
 105                 ret = mipi_dbi_buf_copy(dbidev->tx_buf, fb, rect, swap);
 106                 if (ret)
 107                         goto err_msg;
 108         } else {
 109                 tr = cma_obj->vaddr;
 110         }
 111
 112         switch (dbidev->rotation) {
 113         default:
 114                 x1 = rect->x1;
 115                 x2 = rect->x2 - 1;
 116                 y1 = rect->y1;
 117                 y2 = rect->y2 - 1;
 118                 x_start = x1;
 119                 y_start = y1;
 120                 break;
 121         case 90:
 122                 x1 = rect->y1;
 123                 x2 = rect->y2 - 1;
 124                 y1 = fb->width - rect->x2;
 125                 y2 = fb->width - rect->x1 - 1;
 126                 x_start = x1;
 127                 y_start = y2;
 128                 break;
 129         case 180:
 130                 x1 = fb->width - rect->x2;
 131                 x2 = fb->width - rect->x1 - 1;
 132                 y1 = fb->height - rect->y2;
 133                 y2 = fb->height - rect->y1 - 1;
 134                 x_start = x2;
 135                 y_start = y2;
 136                 break;
 137         case 270:
 138                 x1 = fb->height - rect->y2;
 139                 x2 = fb->height - rect->y1 - 1;
 140                 y1 = rect->x1;
 141                 y2 = rect->x2 - 1;
 142                 x_start = x2;
 143                 y_start = y1;
 144                 break;
 145         }
 146
 147         ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_1, x2);
 148         ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_2, x1);
 149         ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_1, y2);
 150         ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_2, y1);
 151
 152         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, x_start);
 153         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, y_start);
 154
 155         ret = mipi_dbi_command_buf(dbi, ILI9225_WRITE_DATA_TO_GRAM, tr,
 156                                    width * height * 2);
 157 err_msg:
 158         if (ret)
 159                 dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
 160
 161         drm_dev_exit(idx);
 162 }
 163
 164 static void ili9225_pipe_update(struct drm_simple_display_pipe *pipe,
 165                                 struct drm_plane_state *old_state)
 166 {
 167         struct drm_plane_state *state = pipe->plane.state;
 168         struct drm_crtc *crtc = &pipe->crtc;
 169         struct drm_rect rect;
 170
 171         if (drm_atomic_helper_damage_merged(old_state, state, &rect))
 172                 ili9225_fb_dirty(state->fb, &rect);
 173
 174         if (crtc->state->event) {
 175                 spin_lock_irq(&crtc->dev->event_lock);
 176                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
 177                 spin_unlock_irq(&crtc->dev->event_lock);
 178                 crtc->state->event = NULL;
 179         }
 180 }
 181
 182 static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
 183                                 struct drm_crtc_state *crtc_state,
 184                                 struct drm_plane_state *plane_state)
 185 {
 186         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 187         struct drm_framebuffer *fb = plane_state->fb;
 188         struct device *dev = pipe->crtc.dev->dev;
 189         struct mipi_dbi *dbi = &dbidev->dbi;
 190         struct drm_rect rect = {
 191                 .x1 = 0,
 192                 .x2 = fb->width,
 193                 .y1 = 0,
 194                 .y2 = fb->height,
 195         };
 196         int ret, idx;
 197         u8 am_id;
 198
 199         if (!drm_dev_enter(pipe->crtc.dev, &idx))
 200                 return;
 201
 202         DRM_DEBUG_KMS("\n");
 203
 204         mipi_dbi_hw_reset(dbi);
 205
 206         /*
 207          * There don't seem to be two example init sequences that match, so
 208          * using the one from the popular Arduino library for this display.
 209          * https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp
 210          */
 211
 212         ret = ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0000);
 213         if (ret) {
 214                 DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
 215                 goto out_exit;
 216         }
 217         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0000);
 218         ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x0000);
 219         ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x0000);
 220         ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x0000);
 221
 222         msleep(40);
 223
 224         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0018);
 225         ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x6121);
 226         ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x006f);
 227         ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x495f);
 228         ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0800);
 229
 230         msleep(10);
 231
 232         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x103b);
 233
 234         msleep(50);
 235
 236         switch (dbidev->rotation) {
 237         default:
 238                 am_id = 0x30;
 239                 break;
 240         case 90:
 241                 am_id = 0x18;
 242                 break;
 243         case 180:
 244                 am_id = 0x00;
 245                 break;
 246         case 270:
 247                 am_id = 0x28;
 248                 break;
 249         }
 250         ili9225_command(dbi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c);
 251         ili9225_command(dbi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100);
 252         ili9225_command(dbi, ILI9225_ENTRY_MODE, 0x1000 | am_id);
 253         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
 254         ili9225_command(dbi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808);
 255         ili9225_command(dbi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100);
 256         ili9225_command(dbi, ILI9225_INTERFACE_CONTROL, 0x0000);
 257         ili9225_command(dbi, ILI9225_OSCILLATION_CONTROL, 0x0d01);
 258         ili9225_command(dbi, ILI9225_VCI_RECYCLING, 0x0020);
 259         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, 0x0000);
 260         ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, 0x0000);
 261
 262         ili9225_command(dbi, ILI9225_GATE_SCAN_CONTROL, 0x0000);
 263         ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_1, 0x00db);
 264         ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_2, 0x0000);
 265         ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_3, 0x0000);
 266         ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db);
 267         ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000);
 268
 269         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_1, 0x0000);
 270         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_2, 0x0808);
 271         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_3, 0x080a);
 272         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_4, 0x000a);
 273         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_5, 0x0a08);
 274         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_6, 0x0808);
 275         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_7, 0x0000);
 276         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_8, 0x0a00);
 277         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_9, 0x0710);
 278         ili9225_command(dbi, ILI9225_GAMMA_CONTROL_10, 0x0710);
 279
 280         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0012);
 281
 282         msleep(50);
 283
 284         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
 285
 286         dbidev->enabled = true;
 287         ili9225_fb_dirty(fb, &rect);
 288 out_exit:
 289         drm_dev_exit(idx);
 290 }
 291
 292 static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
 293 {
 294         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 295         struct mipi_dbi *dbi = &dbidev->dbi;
 296
 297         DRM_DEBUG_KMS("\n");
 298
 299         /*
 300          * This callback is not protected by drm_dev_enter/exit since we want to
 301          * turn off the display on regular driver unload. It's highly unlikely
 302          * that the underlying SPI controller is gone should this be called after
 303          * unplug.
 304          */
 305
 306         if (!dbidev->enabled)
 307                 return;
 308
 309         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
 310         msleep(50);
 311         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
 312         msleep(50);
 313         ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
 314
 315         dbidev->enabled = false;
 316 }
 317
 318 static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,
 319                                size_t num)
 320 {
 321         struct spi_device *spi = dbi->spi;
 322         unsigned int bpw = 8;
 323         u32 speed_hz;
 324         int ret;
 325
 326         gpiod_set_value_cansleep(dbi->dc, 0);
 327         speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
 328         ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1);
 329         if (ret || !num)
 330                 return ret;
 331
 332         if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes)
 333                 bpw = 16;
 334
 335         gpiod_set_value_cansleep(dbi->dc, 1);
 336         speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
 337
 338         return mipi_dbi_spi_transfer(spi, speed_hz, bpw, par, num);
 339 }
 340
 341 static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = {
 342         .enable         = ili9225_pipe_enable,
 343         .disable        = ili9225_pipe_disable,
 344         .update         = ili9225_pipe_update,
 345         .prepare_fb     = drm_gem_fb_simple_display_pipe_prepare_fb,
 346 };
 347
 348 static const struct drm_display_mode ili9225_mode = {
 349         DRM_SIMPLE_MODE(176, 220, 35, 44),
 350 };
 351
 352 DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops);
 353
 354 static struct drm_driver ili9225_driver = {
 355         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 356         .fops                   = &ili9225_fops,
 357         .release                = mipi_dbi_release,
 358         DRM_GEM_CMA_VMAP_DRIVER_OPS,
 359         .name                   = "ili9225",
 360         .desc                   = "Ilitek ILI9225",
 361         .date                   = "20171106",
 362         .major                  = 1,
 363         .minor                  = 0,
 364 };
 365
 366 static const struct of_device_id ili9225_of_match[] = {
 367         { .compatible = "vot,v220hf01a-t" },
 368         {},
 369 };
 370 MODULE_DEVICE_TABLE(of, ili9225_of_match);
 371
 372 static const struct spi_device_id ili9225_id[] = {
 373         { "v220hf01a-t", 0 },
 374         { },
 375 };
 376 MODULE_DEVICE_TABLE(spi, ili9225_id);
 377
 378 static int ili9225_probe(struct spi_device *spi)
 379 {
 380         struct device *dev = &spi->dev;
 381         struct mipi_dbi_dev *dbidev;
 382         struct drm_device *drm;
 383         struct mipi_dbi *dbi;
 384         struct gpio_desc *rs;
 385         u32 rotation = 0;
 386         int ret;
 387
 388         dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
 389         if (!dbidev)
 390                 return -ENOMEM;
 391
 392         dbi = &dbidev->dbi;
 393         drm = &dbidev->drm;
 394         ret = devm_drm_dev_init(dev, drm, &ili9225_driver);
 395         if (ret) {
 396                 kfree(dbidev);
 397                 return ret;
 398         }
 399
 400         drm_mode_config_init(drm);
 401
 402         dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 403         if (IS_ERR(dbi->reset)) {
 404                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 405                 return PTR_ERR(dbi->reset);
 406         }
 407
 408         rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
 409         if (IS_ERR(rs)) {
 410                 DRM_DEV_ERROR(dev, "Failed to get gpio 'rs'\n");
 411                 return PTR_ERR(rs);
 412         }
 413
 414         device_property_read_u32(dev, "rotation", &rotation);
 415
 416         ret = mipi_dbi_spi_init(spi, dbi, rs);
 417         if (ret)
 418                 return ret;
 419
 420         /* override the command function set in  mipi_dbi_spi_init() */
 421         dbi->command = ili9225_dbi_command;
 422
 423         ret = mipi_dbi_dev_init(dbidev, &ili9225_pipe_funcs, &ili9225_mode, rotation);
 424         if (ret)
 425                 return ret;
 426
 427         drm_mode_config_reset(drm);
 428
 429         ret = drm_dev_register(drm, 0);
 430         if (ret)
 431                 return ret;
 432
 433         spi_set_drvdata(spi, drm);
 434
 435         drm_fbdev_generic_setup(drm, 0);
 436
 437         return 0;
 438 }
 439
 440 static int ili9225_remove(struct spi_device *spi)
 441 {
 442         struct drm_device *drm = spi_get_drvdata(spi);
 443
 444         drm_dev_unplug(drm);
 445         drm_atomic_helper_shutdown(drm);
 446
 447         return 0;
 448 }
 449
 450 static void ili9225_shutdown(struct spi_device *spi)
 451 {
 452         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 453 }
 454
 455 static struct spi_driver ili9225_spi_driver = {
 456         .driver = {
 457                 .name = "ili9225",
 458                 .owner = THIS_MODULE,
 459                 .of_match_table = ili9225_of_match,
 460         },
 461         .id_table = ili9225_id,
 462         .probe = ili9225_probe,
 463         .remove = ili9225_remove,
 464         .shutdown = ili9225_shutdown,
 465 };
 466 module_spi_driver(ili9225_spi_driver);
 467
 468 MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
 469 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 470 MODULE_LICENSE("GPL");