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_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 (!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_rect rect;
 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         dbidev->enabled = true;
 279         ili9225_fb_dirty(fb, &rect);
 280 out_exit:
 281         drm_dev_exit(idx);
 282 }
 283
 284 static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
 285 {
 286         struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
 287         struct mipi_dbi *dbi = &dbidev->dbi;
 288
 289         DRM_DEBUG_KMS("\n");
 290
 291         /*
 292          * This callback is not protected by drm_dev_enter/exit since we want to
 293          * turn off the display on regular driver unload. It's highly unlikely
 294          * that the underlying SPI controller is gone should this be called after
 295          * unplug.
 296          */
 297
 298         if (!dbidev->enabled)
 299                 return;
 300
 301         ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
 302         msleep(50);
 303         ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
 304         msleep(50);
 305         ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
 306
 307         dbidev->enabled = false;
 308 }
 309
 310 static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,
 311                                size_t num)
 312 {
 313         struct spi_device *spi = dbi->spi;
 314         unsigned int bpw = 8;
 315         u32 speed_hz;
 316         int ret;
 317
 318         gpiod_set_value_cansleep(dbi->dc, 0);
 319         speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
 320         ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1);
 321         if (ret || !num)
 322                 return ret;
 323
 324         if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes)
 325                 bpw = 16;
 326
 327         gpiod_set_value_cansleep(dbi->dc, 1);
 328         speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
 329
 330         return mipi_dbi_spi_transfer(spi, speed_hz, bpw, par, num);
 331 }
 332
 333 static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = {
 334         .enable         = ili9225_pipe_enable,
 335         .disable        = ili9225_pipe_disable,
 336         .update         = ili9225_pipe_update,
 337         .prepare_fb     = drm_gem_fb_simple_display_pipe_prepare_fb,
 338 };
 339
 340 static const struct drm_display_mode ili9225_mode = {
 341         DRM_SIMPLE_MODE(176, 220, 35, 44),
 342 };
 343
 344 DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops);
 345
 346 static struct drm_driver ili9225_driver = {
 347         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 348         .fops                   = &ili9225_fops,
 349         DRM_GEM_CMA_VMAP_DRIVER_OPS,
 350         .name                   = "ili9225",
 351         .desc                   = "Ilitek ILI9225",
 352         .date                   = "20171106",
 353         .major                  = 1,
 354         .minor                  = 0,
 355 };
 356
 357 static const struct of_device_id ili9225_of_match[] = {
 358         { .compatible = "vot,v220hf01a-t" },
 359         {},
 360 };
 361 MODULE_DEVICE_TABLE(of, ili9225_of_match);
 362
 363 static const struct spi_device_id ili9225_id[] = {
 364         { "v220hf01a-t", 0 },
 365         { },
 366 };
 367 MODULE_DEVICE_TABLE(spi, ili9225_id);
 368
 369 static int ili9225_probe(struct spi_device *spi)
 370 {
 371         struct device *dev = &spi->dev;
 372         struct mipi_dbi_dev *dbidev;
 373         struct drm_device *drm;
 374         struct mipi_dbi *dbi;
 375         struct gpio_desc *rs;
 376         u32 rotation = 0;
 377         int ret;
 378
 379         dbidev = devm_drm_dev_alloc(dev, &ili9225_driver,
 380                                     struct mipi_dbi_dev, drm);
 381         if (IS_ERR(dbidev))
 382                 return PTR_ERR(dbidev);
 383
 384         dbi = &dbidev->dbi;
 385         drm = &dbidev->drm;
 386
 387         dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 388         if (IS_ERR(dbi->reset)) {
 389                 DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
 390                 return PTR_ERR(dbi->reset);
 391         }
 392
 393         rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
 394         if (IS_ERR(rs)) {
 395                 DRM_DEV_ERROR(dev, "Failed to get gpio 'rs'\n");
 396                 return PTR_ERR(rs);
 397         }
 398
 399         device_property_read_u32(dev, "rotation", &rotation);
 400
 401         ret = mipi_dbi_spi_init(spi, dbi, rs);
 402         if (ret)
 403                 return ret;
 404
 405         /* override the command function set in  mipi_dbi_spi_init() */
 406         dbi->command = ili9225_dbi_command;
 407
 408         ret = mipi_dbi_dev_init(dbidev, &ili9225_pipe_funcs, &ili9225_mode, rotation);
 409         if (ret)
 410                 return ret;
 411
 412         drm_mode_config_reset(drm);
 413
 414         ret = drm_dev_register(drm, 0);
 415         if (ret)
 416                 return ret;
 417
 418         spi_set_drvdata(spi, drm);
 419
 420         drm_fbdev_generic_setup(drm, 0);
 421
 422         return 0;
 423 }
 424
 425 static int ili9225_remove(struct spi_device *spi)
 426 {
 427         struct drm_device *drm = spi_get_drvdata(spi);
 428
 429         drm_dev_unplug(drm);
 430         drm_atomic_helper_shutdown(drm);
 431
 432         return 0;
 433 }
 434
 435 static void ili9225_shutdown(struct spi_device *spi)
 436 {
 437         drm_atomic_helper_shutdown(spi_get_drvdata(spi));
 438 }
 439
 440 static struct spi_driver ili9225_spi_driver = {
 441         .driver = {
 442                 .name = "ili9225",
 443                 .owner = THIS_MODULE,
 444                 .of_match_table = ili9225_of_match,
 445         },
 446         .id_table = ili9225_id,
 447         .probe = ili9225_probe,
 448         .remove = ili9225_remove,
 449         .shutdown = ili9225_shutdown,
 450 };
 451 module_spi_driver(ili9225_spi_driver);
 452
 453 MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
 454 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 455 MODULE_LICENSE("GPL");