// SPDX-License-Identifier: GPL-2.0 /* * AU Optronics A030JTN01.0 TFT LCD panel driver * * Copyright (C) 2023, Paul Cercueil * Copyright (C) 2023, Christophe Branchereau */ #include #include #include #include #include #include #include #include #include #include #include #include #define REG05 0x05 #define REG06 0x06 #define REG07 0x07 #define REG05_STDBY BIT(0) #define REG06_VBLK GENMASK(4, 0) #define REG07_HBLK GENMASK(7, 0) struct a030jtn01_info { const struct drm_display_mode *display_modes; unsigned int num_modes; u16 width_mm, height_mm; u32 bus_format, bus_flags; }; struct a030jtn01 { struct drm_panel panel; struct spi_device *spi; struct regmap *map; const struct a030jtn01_info *panel_info; struct regulator *supply; struct gpio_desc *reset_gpio; }; static inline struct a030jtn01 *to_a030jtn01(struct drm_panel *panel) { return container_of(panel, struct a030jtn01, panel); } static int a030jtn01_prepare(struct drm_panel *panel) { struct a030jtn01 *priv = to_a030jtn01(panel); struct device *dev = &priv->spi->dev; unsigned int dummy; int err; err = regulator_enable(priv->supply); if (err) { dev_err(dev, "Failed to enable power supply: %d\n", err); return err; } usleep_range(1000, 8000); /* Reset the chip */ gpiod_set_value_cansleep(priv->reset_gpio, 1); usleep_range(100, 8000); gpiod_set_value_cansleep(priv->reset_gpio, 0); usleep_range(2000, 8000); /* * No idea why, but a register read (doesn't matter which) is needed to * properly initialize the chip after a reset; otherwise, the colors * will be wrong. It doesn't seem to be timing-related as a msleep(200) * doesn't fix it. */ err = regmap_read(priv->map, REG05, &dummy); if (err) goto err_disable_regulator; /* Use (24 + 6) == 0x1e as the vertical back porch */ err = regmap_write(priv->map, REG06, FIELD_PREP(REG06_VBLK, 0x1e)); if (err) goto err_disable_regulator; /* Use (42 + 30) * 3 == 0xd8 as the horizontal back porch */ err = regmap_write(priv->map, REG07, FIELD_PREP(REG07_HBLK, 0xd8)); if (err) goto err_disable_regulator; return 0; err_disable_regulator: gpiod_set_value_cansleep(priv->reset_gpio, 1); regulator_disable(priv->supply); return err; } static int a030jtn01_unprepare(struct drm_panel *panel) { struct a030jtn01 *priv = to_a030jtn01(panel); gpiod_set_value_cansleep(priv->reset_gpio, 1); regulator_disable(priv->supply); return 0; } static int a030jtn01_enable(struct drm_panel *panel) { struct a030jtn01 *priv = to_a030jtn01(panel); int ret; ret = regmap_set_bits(priv->map, REG05, REG05_STDBY); if (ret) return ret; /* Wait for the picture to be stable */ if (panel->backlight) msleep(100); return 0; } static int a030jtn01_disable(struct drm_panel *panel) { struct a030jtn01 *priv = to_a030jtn01(panel); return regmap_clear_bits(priv->map, REG05, REG05_STDBY); } static int a030jtn01_get_modes(struct drm_panel *panel, struct drm_connector *connector) { struct a030jtn01 *priv = to_a030jtn01(panel); const struct a030jtn01_info *panel_info = priv->panel_info; struct drm_display_mode *mode; unsigned int i; for (i = 0; i < panel_info->num_modes; i++) { mode = drm_mode_duplicate(connector->dev, &panel_info->display_modes[i]); if (!mode) return -ENOMEM; drm_mode_set_name(mode); mode->type = DRM_MODE_TYPE_DRIVER; if (panel_info->num_modes == 1) mode->type |= DRM_MODE_TYPE_PREFERRED; drm_mode_probed_add(connector, mode); } connector->display_info.bpc = 8; connector->display_info.width_mm = panel_info->width_mm; connector->display_info.height_mm = panel_info->height_mm; drm_display_info_set_bus_formats(&connector->display_info, &panel_info->bus_format, 1); connector->display_info.bus_flags = panel_info->bus_flags; return panel_info->num_modes; } static const struct drm_panel_funcs a030jtn01_funcs = { .prepare = a030jtn01_prepare, .unprepare = a030jtn01_unprepare, .enable = a030jtn01_enable, .disable = a030jtn01_disable, .get_modes = a030jtn01_get_modes, }; static bool a030jtn01_has_reg(struct device *dev, unsigned int reg) { static const u32 a030jtn01_regs_mask = 0x001823f1fb; return a030jtn01_regs_mask & BIT(reg); }; static const struct regmap_config a030jtn01_regmap_config = { .reg_bits = 8, .val_bits = 8, .read_flag_mask = 0x40, .max_register = 0x1c, .readable_reg = a030jtn01_has_reg, .writeable_reg = a030jtn01_has_reg, }; static int a030jtn01_probe(struct spi_device *spi) { struct device *dev = &spi->dev; struct a030jtn01 *priv; int err; spi->mode |= SPI_MODE_3 | SPI_3WIRE; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->spi = spi; spi_set_drvdata(spi, priv); priv->map = devm_regmap_init_spi(spi, &a030jtn01_regmap_config); if (IS_ERR(priv->map)) return dev_err_probe(dev, PTR_ERR(priv->map), "Unable to init regmap"); priv->panel_info = spi_get_device_match_data(spi); if (!priv->panel_info) return -EINVAL; priv->supply = devm_regulator_get(dev, "power"); if (IS_ERR(priv->supply)) return dev_err_probe(dev, PTR_ERR(priv->supply), "Failed to get power supply"); priv->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(priv->reset_gpio)) return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), "Failed to get reset GPIO"); drm_panel_init(&priv->panel, dev, &a030jtn01_funcs, DRM_MODE_CONNECTOR_DPI); err = drm_panel_of_backlight(&priv->panel); if (err) return err; drm_panel_add(&priv->panel); return 0; } static void a030jtn01_remove(struct spi_device *spi) { struct a030jtn01 *priv = spi_get_drvdata(spi); drm_panel_remove(&priv->panel); drm_panel_disable(&priv->panel); drm_panel_unprepare(&priv->panel); } static const struct drm_display_mode a030jtn01_modes[] = { { /* 60 Hz */ .clock = 14400, .hdisplay = 320, .hsync_start = 320 + 8, .hsync_end = 320 + 8 + 42, .htotal = 320 + 8 + 42 + 30, .vdisplay = 480, .vsync_start = 480 + 90, .vsync_end = 480 + 90 + 24, .vtotal = 480 + 90 + 24 + 6, .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, }, { /* 50 Hz */ .clock = 12000, .hdisplay = 320, .hsync_start = 320 + 8, .hsync_end = 320 + 8 + 42, .htotal = 320 + 8 + 42 + 30, .vdisplay = 480, .vsync_start = 480 + 90, .vsync_end = 480 + 90 + 24, .vtotal = 480 + 90 + 24 + 6, .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, }, }; static const struct a030jtn01_info a030jtn01_info = { .display_modes = a030jtn01_modes, .num_modes = ARRAY_SIZE(a030jtn01_modes), .width_mm = 70, .height_mm = 51, .bus_format = MEDIA_BUS_FMT_RGB888_3X8_DELTA, .bus_flags = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE, }; static const struct spi_device_id a030jtn01_id[] = { { "a030jtn01", (kernel_ulong_t) &a030jtn01_info }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(spi, a030jtn01_id); static const struct of_device_id a030jtn01_of_match[] = { { .compatible = "auo,a030jtn01" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, a030jtn01_of_match); static struct spi_driver a030jtn01_driver = { .driver = { .name = "auo-a030jtn01", .of_match_table = a030jtn01_of_match, }, .id_table = a030jtn01_id, .probe = a030jtn01_probe, .remove = a030jtn01_remove, }; module_spi_driver(a030jtn01_driver); MODULE_AUTHOR("Paul Cercueil "); MODULE_AUTHOR("Christophe Branchereau "); MODULE_LICENSE("GPL");