drivers/gpu/drm/panel/panel-sony-acx424akp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * MIPI-DSI Sony ACX424AKP panel driver. This is a 480x864
   4  * AMOLED panel with a command-only DSI interface.
   5  *
   6  * Copyright (C) Linaro Ltd. 2019
   7  * Author: Linus Walleij
   8  * Based on code and know-how from Marcus Lorentzon
   9  * Copyright (C) ST-Ericsson SA 2010
  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/of.h>
  16 #include <linux/regulator/consumer.h>
  17
  18 #include <video/mipi_display.h>
  19
  20 #include <drm/drm_mipi_dsi.h>
  21 #include <drm/drm_modes.h>
  22 #include <drm/drm_panel.h>
  23
  24 #define ACX424_DCS_READ_ID1             0xDA
  25 #define ACX424_DCS_READ_ID2             0xDB
  26 #define ACX424_DCS_READ_ID3             0xDC
  27 #define ACX424_DCS_SET_MDDI             0xAE
  28
  29 /*
  30  * Sony seems to use vendor ID 0x81
  31  */
  32 #define DISPLAY_SONY_ACX424AKP_ID1      0x811b
  33 #define DISPLAY_SONY_ACX424AKP_ID2      0x811a
  34 /*
  35  * The third ID looks like a bug, vendor IDs begin at 0x80
  36  * and panel 00 ... seems like default values.
  37  */
  38 #define DISPLAY_SONY_ACX424AKP_ID3      0x8000
  39
  40 struct acx424akp {
  41         struct drm_panel panel;
  42         struct device *dev;
  43         struct backlight_device *bl;
  44         struct regulator *supply;
  45         struct gpio_desc *reset_gpio;
  46         bool video_mode;
  47 };
  48
  49 static const struct drm_display_mode sony_acx424akp_vid_mode = {
  50         .clock = 27234,
  51         .hdisplay = 480,
  52         .hsync_start = 480 + 15,
  53         .hsync_end = 480 + 15 + 0,
  54         .htotal = 480 + 15 + 0 + 15,
  55         .vdisplay = 864,
  56         .vsync_start = 864 + 14,
  57         .vsync_end = 864 + 14 + 1,
  58         .vtotal = 864 + 14 + 1 + 11,
  59         .width_mm = 48,
  60         .height_mm = 84,
  61         .flags = DRM_MODE_FLAG_PVSYNC,
  62 };
  63
  64 /*
  65  * The timings are not very helpful as the display is used in
  66  * command mode using the maximum HS frequency.
  67  */
  68 static const struct drm_display_mode sony_acx424akp_cmd_mode = {
  69         .clock = 35478,
  70         .hdisplay = 480,
  71         .hsync_start = 480 + 154,
  72         .hsync_end = 480 + 154 + 16,
  73         .htotal = 480 + 154 + 16 + 32,
  74         .vdisplay = 864,
  75         .vsync_start = 864 + 1,
  76         .vsync_end = 864 + 1 + 1,
  77         .vtotal = 864 + 1 + 1 + 1,
  78         /*
  79          * Some desired refresh rate, experiments at the maximum "pixel"
  80          * clock speed (HS clock 420 MHz) yields around 117Hz.
  81          */
  82         .width_mm = 48,
  83         .height_mm = 84,
  84 };
  85
  86 static inline struct acx424akp *panel_to_acx424akp(struct drm_panel *panel)
  87 {
  88         return container_of(panel, struct acx424akp, panel);
  89 }
  90
  91 #define FOSC                    20 /* 20Mhz */
  92 #define SCALE_FACTOR_NS_DIV_MHZ 1000
  93
  94 static int acx424akp_set_brightness(struct backlight_device *bl)
  95 {
  96         struct acx424akp *acx = bl_get_data(bl);
  97         struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev);
  98         int period_ns = 1023;
  99         int duty_ns = bl->props.brightness;
 100         u8 pwm_ratio;
 101         u8 pwm_div;
 102         u8 par;
 103         int ret;
 104
 105         /* Calculate the PWM duty cycle in n/256's */
 106         pwm_ratio = max(((duty_ns * 256) / period_ns) - 1, 1);
 107         pwm_div = max(1,
 108                       ((FOSC * period_ns) / 256) /
 109                       SCALE_FACTOR_NS_DIV_MHZ);
 110
 111         /* Set up PWM dutycycle ONE byte (differs from the standard) */
 112         dev_dbg(acx->dev, "calculated duty cycle %02x\n", pwm_ratio);
 113         ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
 114                                  &pwm_ratio, 1);
 115         if (ret < 0) {
 116                 dev_err(acx->dev, "failed to set display PWM ratio (%d)\n", ret);
 117                 return ret;
 118         }
 119
 120         /*
 121          * Sequence to write PWMDIV:
 122          *      address         data
 123          *      0xF3            0xAA   CMD2 Unlock
 124          *      0x00            0x01   Enter CMD2 page 0
 125          *      0X7D            0x01   No reload MTP of CMD2 P1
 126          *      0x22            PWMDIV
 127          *      0x7F            0xAA   CMD2 page 1 lock
 128          */
 129         par = 0xaa;
 130         ret = mipi_dsi_dcs_write(dsi, 0xf3, &par, 1);
 131         if (ret < 0) {
 132                 dev_err(acx->dev, "failed to unlock CMD 2 (%d)\n", ret);
 133                 return ret;
 134         }
 135         par = 0x01;
 136         ret = mipi_dsi_dcs_write(dsi, 0x00, &par, 1);
 137         if (ret < 0) {
 138                 dev_err(acx->dev, "failed to enter page 1 (%d)\n", ret);
 139                 return ret;
 140         }
 141         par = 0x01;
 142         ret = mipi_dsi_dcs_write(dsi, 0x7d, &par, 1);
 143         if (ret < 0) {
 144                 dev_err(acx->dev, "failed to disable MTP reload (%d)\n", ret);
 145                 return ret;
 146         }
 147         ret = mipi_dsi_dcs_write(dsi, 0x22, &pwm_div, 1);
 148         if (ret < 0) {
 149                 dev_err(acx->dev, "failed to set PWM divisor (%d)\n", ret);
 150                 return ret;
 151         }
 152         par = 0xaa;
 153         ret = mipi_dsi_dcs_write(dsi, 0x7f, &par, 1);
 154         if (ret < 0) {
 155                 dev_err(acx->dev, "failed to lock CMD 2 (%d)\n", ret);
 156                 return ret;
 157         }
 158
 159         /* Enable backlight */
 160         par = 0x24;
 161         ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 162                                  &par, 1);
 163         if (ret < 0) {
 164                 dev_err(acx->dev, "failed to enable display backlight (%d)\n", ret);
 165                 return ret;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static const struct backlight_ops acx424akp_bl_ops = {
 172         .update_status = acx424akp_set_brightness,
 173 };
 174
 175 static int acx424akp_read_id(struct acx424akp *acx)
 176 {
 177         struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev);
 178         u8 vendor, version, panel;
 179         u16 val;
 180         int ret;
 181
 182         ret = mipi_dsi_dcs_read(dsi, ACX424_DCS_READ_ID1, &vendor, 1);
 183         if (ret < 0) {
 184                 dev_err(acx->dev, "could not vendor ID byte\n");
 185                 return ret;
 186         }
 187         ret = mipi_dsi_dcs_read(dsi, ACX424_DCS_READ_ID2, &version, 1);
 188         if (ret < 0) {
 189                 dev_err(acx->dev, "could not read device version byte\n");
 190                 return ret;
 191         }
 192         ret = mipi_dsi_dcs_read(dsi, ACX424_DCS_READ_ID3, &panel, 1);
 193         if (ret < 0) {
 194                 dev_err(acx->dev, "could not read panel ID byte\n");
 195                 return ret;
 196         }
 197
 198         if (vendor == 0x00) {
 199                 dev_err(acx->dev, "device vendor ID is zero\n");
 200                 return -ENODEV;
 201         }
 202
 203         val = (vendor << 8) | panel;
 204         switch (val) {
 205         case DISPLAY_SONY_ACX424AKP_ID1:
 206         case DISPLAY_SONY_ACX424AKP_ID2:
 207         case DISPLAY_SONY_ACX424AKP_ID3:
 208                 dev_info(acx->dev, "MTP vendor: %02x, version: %02x, panel: %02x\n",
 209                          vendor, version, panel);
 210                 break;
 211         default:
 212                 dev_info(acx->dev, "unknown vendor: %02x, version: %02x, panel: %02x\n",
 213                          vendor, version, panel);
 214                 break;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int acx424akp_power_on(struct acx424akp *acx)
 221 {
 222         int ret;
 223
 224         ret = regulator_enable(acx->supply);
 225         if (ret) {
 226                 dev_err(acx->dev, "failed to enable supply (%d)\n", ret);
 227                 return ret;
 228         }
 229
 230         /* Assert RESET */
 231         gpiod_set_value_cansleep(acx->reset_gpio, 1);
 232         udelay(20);
 233         /* De-assert RESET */
 234         gpiod_set_value_cansleep(acx->reset_gpio, 0);
 235         usleep_range(11000, 20000);
 236
 237         return 0;
 238 }
 239
 240 static void acx424akp_power_off(struct acx424akp *acx)
 241 {
 242         /* Assert RESET */
 243         gpiod_set_value_cansleep(acx->reset_gpio, 1);
 244         usleep_range(11000, 20000);
 245
 246         regulator_disable(acx->supply);
 247 }
 248
 249 static int acx424akp_prepare(struct drm_panel *panel)
 250 {
 251         struct acx424akp *acx = panel_to_acx424akp(panel);
 252         struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev);
 253         const u8 mddi = 3;
 254         int ret;
 255
 256         ret = acx424akp_power_on(acx);
 257         if (ret)
 258                 return ret;
 259
 260         ret = acx424akp_read_id(acx);
 261         if (ret) {
 262                 dev_err(acx->dev, "failed to read panel ID (%d)\n", ret);
 263                 goto err_power_off;
 264         }
 265
 266         /* Enabe tearing mode: send TE (tearing effect) at VBLANK */
 267         ret = mipi_dsi_dcs_set_tear_on(dsi,
 268                                        MIPI_DSI_DCS_TEAR_MODE_VBLANK);
 269         if (ret) {
 270                 dev_err(acx->dev, "failed to enable vblank TE (%d)\n", ret);
 271                 goto err_power_off;
 272         }
 273
 274         /*
 275          * Set MDDI
 276          *
 277          * This presumably deactivates the Qualcomm MDDI interface and
 278          * selects DSI, similar code is found in other drivers such as the
 279          * Sharp LS043T1LE01 which makes us suspect that this panel may be
 280          * using a Novatek NT35565 or similar display driver chip that shares
 281          * this command. Due to the lack of documentation we cannot know for
 282          * sure.
 283          */
 284         ret = mipi_dsi_dcs_write(dsi, ACX424_DCS_SET_MDDI,
 285                                  &mddi, sizeof(mddi));
 286         if (ret < 0) {
 287                 dev_err(acx->dev, "failed to set MDDI (%d)\n", ret);
 288                 goto err_power_off;
 289         }
 290
 291         /* Exit sleep mode */
 292         ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 293         if (ret) {
 294                 dev_err(acx->dev, "failed to exit sleep mode (%d)\n", ret);
 295                 goto err_power_off;
 296         }
 297         msleep(140);
 298
 299         ret = mipi_dsi_dcs_set_display_on(dsi);
 300         if (ret) {
 301                 dev_err(acx->dev, "failed to turn display on (%d)\n", ret);
 302                 goto err_power_off;
 303         }
 304         if (acx->video_mode) {
 305                 /* In video mode turn peripheral on */
 306                 ret = mipi_dsi_turn_on_peripheral(dsi);
 307                 if (ret) {
 308                         dev_err(acx->dev, "failed to turn on peripheral\n");
 309                         goto err_power_off;
 310                 }
 311         }
 312
 313         acx->bl->props.power = FB_BLANK_NORMAL;
 314
 315         return 0;
 316
 317 err_power_off:
 318         acx424akp_power_off(acx);
 319         return ret;
 320 }
 321
 322 static int acx424akp_unprepare(struct drm_panel *panel)
 323 {
 324         struct acx424akp *acx = panel_to_acx424akp(panel);
 325         struct mipi_dsi_device *dsi = to_mipi_dsi_device(acx->dev);
 326         u8 par;
 327         int ret;
 328
 329         /* Disable backlight */
 330         par = 0x00;
 331         ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 332                                  &par, 1);
 333         if (ret) {
 334                 dev_err(acx->dev, "failed to disable display backlight (%d)\n", ret);
 335                 return ret;
 336         }
 337
 338         ret = mipi_dsi_dcs_set_display_off(dsi);
 339         if (ret) {
 340                 dev_err(acx->dev, "failed to turn display off (%d)\n", ret);
 341                 return ret;
 342         }
 343
 344         /* Enter sleep mode */
 345         ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 346         if (ret) {
 347                 dev_err(acx->dev, "failed to enter sleep mode (%d)\n", ret);
 348                 return ret;
 349         }
 350         msleep(85);
 351
 352         acx424akp_power_off(acx);
 353         acx->bl->props.power = FB_BLANK_POWERDOWN;
 354
 355         return 0;
 356 }
 357
 358 static int acx424akp_enable(struct drm_panel *panel)
 359 {
 360         struct acx424akp *acx = panel_to_acx424akp(panel);
 361
 362         /*
 363          * The backlight is on as long as the display is on
 364          * so no use to call backlight_enable() here.
 365          */
 366         acx->bl->props.power = FB_BLANK_UNBLANK;
 367
 368         return 0;
 369 }
 370
 371 static int acx424akp_disable(struct drm_panel *panel)
 372 {
 373         struct acx424akp *acx = panel_to_acx424akp(panel);
 374
 375         /*
 376          * The backlight is on as long as the display is on
 377          * so no use to call backlight_disable() here.
 378          */
 379         acx->bl->props.power = FB_BLANK_NORMAL;
 380
 381         return 0;
 382 }
 383
 384 static int acx424akp_get_modes(struct drm_panel *panel,
 385                                struct drm_connector *connector)
 386 {
 387         struct acx424akp *acx = panel_to_acx424akp(panel);
 388         struct drm_display_mode *mode;
 389
 390         if (acx->video_mode)
 391                 mode = drm_mode_duplicate(connector->dev,
 392                                           &sony_acx424akp_vid_mode);
 393         else
 394                 mode = drm_mode_duplicate(connector->dev,
 395                                           &sony_acx424akp_cmd_mode);
 396         if (!mode) {
 397                 dev_err(panel->dev, "bad mode or failed to add mode\n");
 398                 return -EINVAL;
 399         }
 400         drm_mode_set_name(mode);
 401         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 402
 403         connector->display_info.width_mm = mode->width_mm;
 404         connector->display_info.height_mm = mode->height_mm;
 405
 406         drm_mode_probed_add(connector, mode);
 407
 408         return 1; /* Number of modes */
 409 }
 410
 411 static const struct drm_panel_funcs acx424akp_drm_funcs = {
 412         .disable = acx424akp_disable,
 413         .unprepare = acx424akp_unprepare,
 414         .prepare = acx424akp_prepare,
 415         .enable = acx424akp_enable,
 416         .get_modes = acx424akp_get_modes,
 417 };
 418
 419 static int acx424akp_probe(struct mipi_dsi_device *dsi)
 420 {
 421         struct device *dev = &dsi->dev;
 422         struct acx424akp *acx;
 423         int ret;
 424
 425         acx = devm_kzalloc(dev, sizeof(struct acx424akp), GFP_KERNEL);
 426         if (!acx)
 427                 return -ENOMEM;
 428         acx->video_mode = of_property_read_bool(dev->of_node,
 429                                                 "enforce-video-mode");
 430
 431         mipi_dsi_set_drvdata(dsi, acx);
 432         acx->dev = dev;
 433
 434         dsi->lanes = 2;
 435         dsi->format = MIPI_DSI_FMT_RGB888;
 436         /*
 437          * FIXME: these come from the ST-Ericsson vendor driver for the
 438          * HREF520 and seems to reflect limitations in the PLLs on that
 439          * platform, if you have the datasheet, please cross-check the
 440          * actual max rates.
 441          */
 442         dsi->lp_rate = 19200000;
 443         dsi->hs_rate = 420160000;
 444
 445         if (acx->video_mode)
 446                 /* Burst mode using event for sync */
 447                 dsi->mode_flags =
 448                         MIPI_DSI_MODE_VIDEO |
 449                         MIPI_DSI_MODE_VIDEO_BURST;
 450         else
 451                 dsi->mode_flags =
 452                         MIPI_DSI_CLOCK_NON_CONTINUOUS |
 453                         MIPI_DSI_MODE_EOT_PACKET;
 454
 455         acx->supply = devm_regulator_get(dev, "vddi");
 456         if (IS_ERR(acx->supply))
 457                 return PTR_ERR(acx->supply);
 458
 459         /* This asserts RESET by default */
 460         acx->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 461                                                   GPIOD_OUT_HIGH);
 462         if (IS_ERR(acx->reset_gpio)) {
 463                 ret = PTR_ERR(acx->reset_gpio);
 464                 if (ret != -EPROBE_DEFER)
 465                         dev_err(dev, "failed to request GPIO (%d)\n", ret);
 466                 return ret;
 467         }
 468
 469         drm_panel_init(&acx->panel, dev, &acx424akp_drm_funcs,
 470                        DRM_MODE_CONNECTOR_DSI);
 471
 472         acx->bl = devm_backlight_device_register(dev, "acx424akp", dev, acx,
 473                                                  &acx424akp_bl_ops, NULL);
 474         if (IS_ERR(acx->bl)) {
 475                 dev_err(dev, "failed to register backlight device\n");
 476                 return PTR_ERR(acx->bl);
 477         }
 478         acx->bl->props.max_brightness = 1023;
 479         acx->bl->props.brightness = 512;
 480         acx->bl->props.power = FB_BLANK_POWERDOWN;
 481
 482         drm_panel_add(&acx->panel);
 483
 484         ret = mipi_dsi_attach(dsi);
 485         if (ret < 0) {
 486                 drm_panel_remove(&acx->panel);
 487                 return ret;
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int acx424akp_remove(struct mipi_dsi_device *dsi)
 494 {
 495         struct acx424akp *acx = mipi_dsi_get_drvdata(dsi);
 496
 497         mipi_dsi_detach(dsi);
 498         drm_panel_remove(&acx->panel);
 499
 500         return 0;
 501 }
 502
 503 static const struct of_device_id acx424akp_of_match[] = {
 504         { .compatible = "sony,acx424akp" },
 505         { /* sentinel */ }
 506 };
 507 MODULE_DEVICE_TABLE(of, acx424akp_of_match);
 508
 509 static struct mipi_dsi_driver acx424akp_driver = {
 510         .probe = acx424akp_probe,
 511         .remove = acx424akp_remove,
 512         .driver = {
 513                 .name = "panel-sony-acx424akp",
 514                 .of_match_table = acx424akp_of_match,
 515         },
 516 };
 517 module_mipi_dsi_driver(acx424akp_driver);
 518
 519 MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
 520 MODULE_DESCRIPTION("MIPI-DSI Sony acx424akp Panel Driver");
 521 MODULE_LICENSE("GPL v2");