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0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (c) 2019 Theobroma Systems Design und Consulting GmbH
0004  *
0005  * base on panel-kingdisplay-kd097d04.c
0006  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
0007  */
0008 
0009 #include <linux/backlight.h>
0010 #include <linux/delay.h>
0011 #include <linux/gpio/consumer.h>
0012 #include <linux/module.h>
0013 #include <linux/of.h>
0014 #include <linux/regulator/consumer.h>
0015 
0016 #include <video/mipi_display.h>
0017 
0018 #include <drm/drm_crtc.h>
0019 #include <drm/drm_device.h>
0020 #include <drm/drm_mipi_dsi.h>
0021 #include <drm/drm_modes.h>
0022 #include <drm/drm_panel.h>
0023 
0024 struct ltk500hd1829 {
0025     struct device *dev;
0026     struct drm_panel panel;
0027     struct gpio_desc *reset_gpio;
0028     struct regulator *vcc;
0029     struct regulator *iovcc;
0030     bool prepared;
0031 };
0032 
0033 struct ltk500hd1829_cmd {
0034     char cmd;
0035     char data;
0036 };
0037 
0038 /*
0039  * There is no description in the Reference Manual about these commands.
0040  * We received them from the vendor, so just use them as is.
0041  */
0042 static const struct ltk500hd1829_cmd init_code[] = {
0043     { 0xE0, 0x00 },
0044     { 0xE1, 0x93 },
0045     { 0xE2, 0x65 },
0046     { 0xE3, 0xF8 },
0047     { 0x80, 0x03 },
0048     { 0xE0, 0x04 },
0049     { 0x2D, 0x03 },
0050     { 0xE0, 0x01 },
0051     { 0x00, 0x00 },
0052     { 0x01, 0xB6 },
0053     { 0x03, 0x00 },
0054     { 0x04, 0xC5 },
0055     { 0x17, 0x00 },
0056     { 0x18, 0xBF },
0057     { 0x19, 0x01 },
0058     { 0x1A, 0x00 },
0059     { 0x1B, 0xBF },
0060     { 0x1C, 0x01 },
0061     { 0x1F, 0x7C },
0062     { 0x20, 0x26 },
0063     { 0x21, 0x26 },
0064     { 0x22, 0x4E },
0065     { 0x37, 0x09 },
0066     { 0x38, 0x04 },
0067     { 0x39, 0x08 },
0068     { 0x3A, 0x1F },
0069     { 0x3B, 0x1F },
0070     { 0x3C, 0x78 },
0071     { 0x3D, 0xFF },
0072     { 0x3E, 0xFF },
0073     { 0x3F, 0x00 },
0074     { 0x40, 0x04 },
0075     { 0x41, 0xA0 },
0076     { 0x43, 0x0F },
0077     { 0x44, 0x0A },
0078     { 0x45, 0x24 },
0079     { 0x55, 0x01 },
0080     { 0x56, 0x01 },
0081     { 0x57, 0xA5 },
0082     { 0x58, 0x0A },
0083     { 0x59, 0x4A },
0084     { 0x5A, 0x38 },
0085     { 0x5B, 0x10 },
0086     { 0x5C, 0x19 },
0087     { 0x5D, 0x7C },
0088     { 0x5E, 0x64 },
0089     { 0x5F, 0x54 },
0090     { 0x60, 0x48 },
0091     { 0x61, 0x44 },
0092     { 0x62, 0x35 },
0093     { 0x63, 0x3A },
0094     { 0x64, 0x24 },
0095     { 0x65, 0x3B },
0096     { 0x66, 0x39 },
0097     { 0x67, 0x37 },
0098     { 0x68, 0x56 },
0099     { 0x69, 0x41 },
0100     { 0x6A, 0x47 },
0101     { 0x6B, 0x2F },
0102     { 0x6C, 0x23 },
0103     { 0x6D, 0x13 },
0104     { 0x6E, 0x02 },
0105     { 0x6F, 0x08 },
0106     { 0x70, 0x7C },
0107     { 0x71, 0x64 },
0108     { 0x72, 0x54 },
0109     { 0x73, 0x48 },
0110     { 0x74, 0x44 },
0111     { 0x75, 0x35 },
0112     { 0x76, 0x3A },
0113     { 0x77, 0x22 },
0114     { 0x78, 0x3B },
0115     { 0x79, 0x39 },
0116     { 0x7A, 0x38 },
0117     { 0x7B, 0x52 },
0118     { 0x7C, 0x41 },
0119     { 0x7D, 0x47 },
0120     { 0x7E, 0x2F },
0121     { 0x7F, 0x23 },
0122     { 0x80, 0x13 },
0123     { 0x81, 0x02 },
0124     { 0x82, 0x08 },
0125     { 0xE0, 0x02 },
0126     { 0x00, 0x57 },
0127     { 0x01, 0x77 },
0128     { 0x02, 0x44 },
0129     { 0x03, 0x46 },
0130     { 0x04, 0x48 },
0131     { 0x05, 0x4A },
0132     { 0x06, 0x4C },
0133     { 0x07, 0x4E },
0134     { 0x08, 0x50 },
0135     { 0x09, 0x55 },
0136     { 0x0A, 0x52 },
0137     { 0x0B, 0x55 },
0138     { 0x0C, 0x55 },
0139     { 0x0D, 0x55 },
0140     { 0x0E, 0x55 },
0141     { 0x0F, 0x55 },
0142     { 0x10, 0x55 },
0143     { 0x11, 0x55 },
0144     { 0x12, 0x55 },
0145     { 0x13, 0x40 },
0146     { 0x14, 0x55 },
0147     { 0x15, 0x55 },
0148     { 0x16, 0x57 },
0149     { 0x17, 0x77 },
0150     { 0x18, 0x45 },
0151     { 0x19, 0x47 },
0152     { 0x1A, 0x49 },
0153     { 0x1B, 0x4B },
0154     { 0x1C, 0x4D },
0155     { 0x1D, 0x4F },
0156     { 0x1E, 0x51 },
0157     { 0x1F, 0x55 },
0158     { 0x20, 0x53 },
0159     { 0x21, 0x55 },
0160     { 0x22, 0x55 },
0161     { 0x23, 0x55 },
0162     { 0x24, 0x55 },
0163     { 0x25, 0x55 },
0164     { 0x26, 0x55 },
0165     { 0x27, 0x55 },
0166     { 0x28, 0x55 },
0167     { 0x29, 0x41 },
0168     { 0x2A, 0x55 },
0169     { 0x2B, 0x55 },
0170     { 0x2C, 0x57 },
0171     { 0x2D, 0x77 },
0172     { 0x2E, 0x4F },
0173     { 0x2F, 0x4D },
0174     { 0x30, 0x4B },
0175     { 0x31, 0x49 },
0176     { 0x32, 0x47 },
0177     { 0x33, 0x45 },
0178     { 0x34, 0x41 },
0179     { 0x35, 0x55 },
0180     { 0x36, 0x53 },
0181     { 0x37, 0x55 },
0182     { 0x38, 0x55 },
0183     { 0x39, 0x55 },
0184     { 0x3A, 0x55 },
0185     { 0x3B, 0x55 },
0186     { 0x3C, 0x55 },
0187     { 0x3D, 0x55 },
0188     { 0x3E, 0x55 },
0189     { 0x3F, 0x51 },
0190     { 0x40, 0x55 },
0191     { 0x41, 0x55 },
0192     { 0x42, 0x57 },
0193     { 0x43, 0x77 },
0194     { 0x44, 0x4E },
0195     { 0x45, 0x4C },
0196     { 0x46, 0x4A },
0197     { 0x47, 0x48 },
0198     { 0x48, 0x46 },
0199     { 0x49, 0x44 },
0200     { 0x4A, 0x40 },
0201     { 0x4B, 0x55 },
0202     { 0x4C, 0x52 },
0203     { 0x4D, 0x55 },
0204     { 0x4E, 0x55 },
0205     { 0x4F, 0x55 },
0206     { 0x50, 0x55 },
0207     { 0x51, 0x55 },
0208     { 0x52, 0x55 },
0209     { 0x53, 0x55 },
0210     { 0x54, 0x55 },
0211     { 0x55, 0x50 },
0212     { 0x56, 0x55 },
0213     { 0x57, 0x55 },
0214     { 0x58, 0x40 },
0215     { 0x59, 0x00 },
0216     { 0x5A, 0x00 },
0217     { 0x5B, 0x10 },
0218     { 0x5C, 0x09 },
0219     { 0x5D, 0x30 },
0220     { 0x5E, 0x01 },
0221     { 0x5F, 0x02 },
0222     { 0x60, 0x30 },
0223     { 0x61, 0x03 },
0224     { 0x62, 0x04 },
0225     { 0x63, 0x06 },
0226     { 0x64, 0x6A },
0227     { 0x65, 0x75 },
0228     { 0x66, 0x0F },
0229     { 0x67, 0xB3 },
0230     { 0x68, 0x0B },
0231     { 0x69, 0x06 },
0232     { 0x6A, 0x6A },
0233     { 0x6B, 0x10 },
0234     { 0x6C, 0x00 },
0235     { 0x6D, 0x04 },
0236     { 0x6E, 0x04 },
0237     { 0x6F, 0x88 },
0238     { 0x70, 0x00 },
0239     { 0x71, 0x00 },
0240     { 0x72, 0x06 },
0241     { 0x73, 0x7B },
0242     { 0x74, 0x00 },
0243     { 0x75, 0xBC },
0244     { 0x76, 0x00 },
0245     { 0x77, 0x05 },
0246     { 0x78, 0x2E },
0247     { 0x79, 0x00 },
0248     { 0x7A, 0x00 },
0249     { 0x7B, 0x00 },
0250     { 0x7C, 0x00 },
0251     { 0x7D, 0x03 },
0252     { 0x7E, 0x7B },
0253     { 0xE0, 0x04 },
0254     { 0x09, 0x10 },
0255     { 0x2B, 0x2B },
0256     { 0x2E, 0x44 },
0257     { 0xE0, 0x00 },
0258     { 0xE6, 0x02 },
0259     { 0xE7, 0x02 },
0260     { 0x35, 0x00 },
0261 };
0262 
0263 static inline
0264 struct ltk500hd1829 *panel_to_ltk500hd1829(struct drm_panel *panel)
0265 {
0266     return container_of(panel, struct ltk500hd1829, panel);
0267 }
0268 
0269 static int ltk500hd1829_unprepare(struct drm_panel *panel)
0270 {
0271     struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
0272     struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
0273     int ret;
0274 
0275     if (!ctx->prepared)
0276         return 0;
0277 
0278     ret = mipi_dsi_dcs_set_display_off(dsi);
0279     if (ret < 0)
0280         dev_err(panel->dev, "failed to set display off: %d\n", ret);
0281 
0282     ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
0283     if (ret < 0) {
0284         dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
0285     }
0286 
0287     /* 120ms to enter sleep mode */
0288     msleep(120);
0289 
0290     regulator_disable(ctx->iovcc);
0291     regulator_disable(ctx->vcc);
0292 
0293     ctx->prepared = false;
0294 
0295     return 0;
0296 }
0297 
0298 static int ltk500hd1829_prepare(struct drm_panel *panel)
0299 {
0300     struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
0301     struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
0302     unsigned int i;
0303     int ret;
0304 
0305     if (ctx->prepared)
0306         return 0;
0307 
0308     ret = regulator_enable(ctx->vcc);
0309     if (ret < 0) {
0310         dev_err(ctx->dev, "Failed to enable vci supply: %d\n", ret);
0311         return ret;
0312     }
0313     ret = regulator_enable(ctx->iovcc);
0314     if (ret < 0) {
0315         dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
0316         goto disable_vcc;
0317     }
0318 
0319     gpiod_set_value_cansleep(ctx->reset_gpio, 1);
0320     /* tRW: 10us */
0321     usleep_range(10, 20);
0322     gpiod_set_value_cansleep(ctx->reset_gpio, 0);
0323 
0324     /* tRT: >= 5ms */
0325     usleep_range(5000, 6000);
0326 
0327     for (i = 0; i < ARRAY_SIZE(init_code); i++) {
0328         ret = mipi_dsi_generic_write(dsi, &init_code[i],
0329                          sizeof(struct ltk500hd1829_cmd));
0330         if (ret < 0) {
0331             dev_err(panel->dev, "failed to write init cmds: %d\n", ret);
0332             goto disable_iovcc;
0333         }
0334     }
0335 
0336     ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
0337     if (ret < 0) {
0338         dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
0339         goto disable_iovcc;
0340     }
0341 
0342     /* 120ms to exit sleep mode */
0343     msleep(120);
0344 
0345     ret = mipi_dsi_dcs_set_display_on(dsi);
0346     if (ret < 0) {
0347         dev_err(panel->dev, "failed to set display on: %d\n", ret);
0348         goto disable_iovcc;
0349     }
0350 
0351     ctx->prepared = true;
0352 
0353     return 0;
0354 
0355 disable_iovcc:
0356     regulator_disable(ctx->iovcc);
0357 disable_vcc:
0358     regulator_disable(ctx->vcc);
0359     return ret;
0360 }
0361 
0362 static const struct drm_display_mode default_mode = {
0363     .hdisplay   = 720,
0364     .hsync_start    = 720 + 50,
0365     .hsync_end  = 720 + 50 + 50,
0366     .htotal     = 720 + 50 + 50 + 50,
0367     .vdisplay   = 1280,
0368     .vsync_start    = 1280 + 30,
0369     .vsync_end  = 1280 + 30 + 4,
0370     .vtotal     = 1280 + 30 + 4 + 12,
0371     .clock      = 69217,
0372     .width_mm   = 62,
0373     .height_mm  = 110,
0374 };
0375 
0376 static int ltk500hd1829_get_modes(struct drm_panel *panel,
0377                   struct drm_connector *connector)
0378 {
0379     struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
0380     struct drm_display_mode *mode;
0381 
0382     mode = drm_mode_duplicate(connector->dev, &default_mode);
0383     if (!mode) {
0384         dev_err(ctx->dev, "failed to add mode %ux%u@%u\n",
0385             default_mode.hdisplay, default_mode.vdisplay,
0386             drm_mode_vrefresh(&default_mode));
0387         return -ENOMEM;
0388     }
0389 
0390     drm_mode_set_name(mode);
0391 
0392     mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
0393     connector->display_info.width_mm = mode->width_mm;
0394     connector->display_info.height_mm = mode->height_mm;
0395     drm_mode_probed_add(connector, mode);
0396 
0397     return 1;
0398 }
0399 
0400 static const struct drm_panel_funcs ltk500hd1829_funcs = {
0401     .unprepare = ltk500hd1829_unprepare,
0402     .prepare = ltk500hd1829_prepare,
0403     .get_modes = ltk500hd1829_get_modes,
0404 };
0405 
0406 static int ltk500hd1829_probe(struct mipi_dsi_device *dsi)
0407 {
0408     struct ltk500hd1829 *ctx;
0409     struct device *dev = &dsi->dev;
0410     int ret;
0411 
0412     ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
0413     if (!ctx)
0414         return -ENOMEM;
0415 
0416     ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
0417     if (IS_ERR(ctx->reset_gpio)) {
0418         dev_err(dev, "cannot get reset gpio\n");
0419         return PTR_ERR(ctx->reset_gpio);
0420     }
0421 
0422     ctx->vcc = devm_regulator_get(dev, "vcc");
0423     if (IS_ERR(ctx->vcc)) {
0424         ret = PTR_ERR(ctx->vcc);
0425         if (ret != -EPROBE_DEFER)
0426             dev_err(dev, "Failed to request vcc regulator: %d\n", ret);
0427         return ret;
0428     }
0429 
0430     ctx->iovcc = devm_regulator_get(dev, "iovcc");
0431     if (IS_ERR(ctx->iovcc)) {
0432         ret = PTR_ERR(ctx->iovcc);
0433         if (ret != -EPROBE_DEFER)
0434             dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
0435         return ret;
0436     }
0437 
0438     mipi_dsi_set_drvdata(dsi, ctx);
0439 
0440     ctx->dev = dev;
0441 
0442     dsi->lanes = 4;
0443     dsi->format = MIPI_DSI_FMT_RGB888;
0444     dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
0445               MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET;
0446 
0447     drm_panel_init(&ctx->panel, &dsi->dev, &ltk500hd1829_funcs,
0448                DRM_MODE_CONNECTOR_DSI);
0449 
0450     ret = drm_panel_of_backlight(&ctx->panel);
0451     if (ret)
0452         return ret;
0453 
0454     drm_panel_add(&ctx->panel);
0455 
0456     ret = mipi_dsi_attach(dsi);
0457     if (ret < 0) {
0458         dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
0459         drm_panel_remove(&ctx->panel);
0460         return ret;
0461     }
0462 
0463     return 0;
0464 }
0465 
0466 static void ltk500hd1829_shutdown(struct mipi_dsi_device *dsi)
0467 {
0468     struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
0469     int ret;
0470 
0471     ret = drm_panel_unprepare(&ctx->panel);
0472     if (ret < 0)
0473         dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
0474 
0475     ret = drm_panel_disable(&ctx->panel);
0476     if (ret < 0)
0477         dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
0478 }
0479 
0480 static int ltk500hd1829_remove(struct mipi_dsi_device *dsi)
0481 {
0482     struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
0483     int ret;
0484 
0485     ltk500hd1829_shutdown(dsi);
0486 
0487     ret = mipi_dsi_detach(dsi);
0488     if (ret < 0)
0489         dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
0490 
0491     drm_panel_remove(&ctx->panel);
0492 
0493     return 0;
0494 }
0495 
0496 static const struct of_device_id ltk500hd1829_of_match[] = {
0497     { .compatible = "leadtek,ltk500hd1829", },
0498     { /* sentinel */ }
0499 };
0500 MODULE_DEVICE_TABLE(of, ltk500hd1829_of_match);
0501 
0502 static struct mipi_dsi_driver ltk500hd1829_driver = {
0503     .driver = {
0504         .name = "panel-leadtek-ltk500hd1829",
0505         .of_match_table = ltk500hd1829_of_match,
0506     },
0507     .probe = ltk500hd1829_probe,
0508     .remove = ltk500hd1829_remove,
0509     .shutdown = ltk500hd1829_shutdown,
0510 };
0511 module_mipi_dsi_driver(ltk500hd1829_driver);
0512 
0513 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
0514 MODULE_DESCRIPTION("Leadtek LTK500HD1829 panel driver");
0515 MODULE_LICENSE("GPL v2");
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