diff options
Diffstat (limited to 'drivers/gpu/drm/panel/panel-novatek-nt39016.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-novatek-nt39016.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt39016.c b/drivers/gpu/drm/panel/panel-novatek-nt39016.c new file mode 100644 index 000000000000..2ad1063b068d --- /dev/null +++ b/drivers/gpu/drm/panel/panel-novatek-nt39016.c @@ -0,0 +1,359 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Novatek NT39016 TFT LCD panel driver + * + * Copyright (C) 2017, Maarten ter Huurne <maarten@treewalker.org> + * Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net> + */ + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/gpio/consumer.h> +#include <linux/media-bus-format.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/spi/spi.h> + +#include <drm/drm_modes.h> +#include <drm/drm_panel.h> + +enum nt39016_regs { + NT39016_REG_SYSTEM, + NT39016_REG_TIMING, + NT39016_REG_OP, + NT39016_REG_DATA_IN, + NT39016_REG_SRC_TIMING_DELAY, + NT39016_REG_GATE_TIMING_DELAY, + NT39016_REG_RESERVED, + NT39016_REG_INITIAL_FUNC, + NT39016_REG_CONTRAST, + NT39016_REG_BRIGHTNESS, + NT39016_REG_HUE_SATURATION, + NT39016_REG_RB_SUBCONTRAST, + NT39016_REG_R_SUBBRIGHTNESS, + NT39016_REG_B_SUBBRIGHTNESS, + NT39016_REG_VCOMDC, + NT39016_REG_VCOMAC, + NT39016_REG_VGAM2, + NT39016_REG_VGAM34, + NT39016_REG_VGAM56, + NT39016_REG_VCOMDC_TRIM = 0x1e, + NT39016_REG_DISPLAY_MODE = 0x20, +}; + +#define NT39016_SYSTEM_RESET_N BIT(0) +#define NT39016_SYSTEM_STANDBY BIT(1) + +struct nt39016_panel_info { + struct drm_display_mode display_mode; + u16 width_mm, height_mm; + u32 bus_format, bus_flags; +}; + +struct nt39016 { + struct drm_panel drm_panel; + struct device *dev; + struct regmap *map; + struct regulator *supply; + const struct nt39016_panel_info *panel_info; + + struct gpio_desc *reset_gpio; + + struct backlight_device *backlight; +}; + +static inline struct nt39016 *to_nt39016(struct drm_panel *panel) +{ + return container_of(panel, struct nt39016, drm_panel); +} + +#define RV(REG, VAL) { .reg = (REG), .def = (VAL), .delay_us = 2 } +static const struct reg_sequence nt39016_panel_regs[] = { + RV(NT39016_REG_SYSTEM, 0x00), + RV(NT39016_REG_TIMING, 0x00), + RV(NT39016_REG_OP, 0x03), + RV(NT39016_REG_DATA_IN, 0xCC), + RV(NT39016_REG_SRC_TIMING_DELAY, 0x46), + RV(NT39016_REG_GATE_TIMING_DELAY, 0x05), + RV(NT39016_REG_RESERVED, 0x00), + RV(NT39016_REG_INITIAL_FUNC, 0x00), + RV(NT39016_REG_CONTRAST, 0x08), + RV(NT39016_REG_BRIGHTNESS, 0x40), + RV(NT39016_REG_HUE_SATURATION, 0x88), + RV(NT39016_REG_RB_SUBCONTRAST, 0x88), + RV(NT39016_REG_R_SUBBRIGHTNESS, 0x20), + RV(NT39016_REG_B_SUBBRIGHTNESS, 0x20), + RV(NT39016_REG_VCOMDC, 0x67), + RV(NT39016_REG_VCOMAC, 0xA4), + RV(NT39016_REG_VGAM2, 0x04), + RV(NT39016_REG_VGAM34, 0x24), + RV(NT39016_REG_VGAM56, 0x24), + RV(NT39016_REG_DISPLAY_MODE, 0x00), +}; + +#undef RV + +static const struct regmap_range nt39016_regmap_no_ranges[] = { + regmap_reg_range(0x13, 0x1D), + regmap_reg_range(0x1F, 0x1F), +}; + +static const struct regmap_access_table nt39016_regmap_access_table = { + .no_ranges = nt39016_regmap_no_ranges, + .n_no_ranges = ARRAY_SIZE(nt39016_regmap_no_ranges), +}; + +static const struct regmap_config nt39016_regmap_config = { + .reg_bits = 6, + .pad_bits = 2, + .val_bits = 8, + + .max_register = NT39016_REG_DISPLAY_MODE, + .wr_table = &nt39016_regmap_access_table, + .write_flag_mask = 0x02, + + .cache_type = REGCACHE_FLAT, +}; + +static int nt39016_prepare(struct drm_panel *drm_panel) +{ + struct nt39016 *panel = to_nt39016(drm_panel); + int err; + + err = regulator_enable(panel->supply); + if (err) { + dev_err(panel->dev, "Failed to enable power supply: %d", err); + return err; + } + + /* + * Reset the NT39016. + * The documentation says the reset pulse should be at least 40 us to + * pass the glitch filter, but when testing I see some resets fail and + * some succeed when using a 70 us delay, so we use 100 us instead. + */ + gpiod_set_value_cansleep(panel->reset_gpio, 1); + usleep_range(100, 1000); + gpiod_set_value_cansleep(panel->reset_gpio, 0); + udelay(2); + + /* Init all registers. */ + err = regmap_multi_reg_write(panel->map, nt39016_panel_regs, + ARRAY_SIZE(nt39016_panel_regs)); + if (err) { + dev_err(panel->dev, "Failed to init registers: %d", err); + goto err_disable_regulator; + } + + return 0; + +err_disable_regulator: + regulator_disable(panel->supply); + return err; +} + +static int nt39016_unprepare(struct drm_panel *drm_panel) +{ + struct nt39016 *panel = to_nt39016(drm_panel); + + gpiod_set_value_cansleep(panel->reset_gpio, 1); + + regulator_disable(panel->supply); + + return 0; +} + +static int nt39016_enable(struct drm_panel *drm_panel) +{ + struct nt39016 *panel = to_nt39016(drm_panel); + int ret; + + ret = regmap_write(panel->map, NT39016_REG_SYSTEM, + NT39016_SYSTEM_RESET_N | NT39016_SYSTEM_STANDBY); + if (ret) { + dev_err(panel->dev, "Unable to enable panel: %d", ret); + return ret; + } + + if (panel->backlight) { + /* Wait for the picture to be ready before enabling backlight */ + msleep(150); + + ret = backlight_enable(panel->backlight); + } + + return ret; +} + +static int nt39016_disable(struct drm_panel *drm_panel) +{ + struct nt39016 *panel = to_nt39016(drm_panel); + int err; + + backlight_disable(panel->backlight); + + err = regmap_write(panel->map, NT39016_REG_SYSTEM, + NT39016_SYSTEM_RESET_N); + if (err) { + dev_err(panel->dev, "Unable to disable panel: %d", err); + return err; + } + + return 0; +} + +static int nt39016_get_modes(struct drm_panel *drm_panel) +{ + struct nt39016 *panel = to_nt39016(drm_panel); + const struct nt39016_panel_info *panel_info = panel->panel_info; + struct drm_connector *connector = drm_panel->connector; + struct drm_display_mode *mode; + + mode = drm_mode_duplicate(drm_panel->drm, &panel_info->display_mode); + if (!mode) + return -ENOMEM; + + drm_mode_set_name(mode); + + mode->type = DRM_MODE_TYPE_DRIVER | 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 1; +} + +static const struct drm_panel_funcs nt39016_funcs = { + .prepare = nt39016_prepare, + .unprepare = nt39016_unprepare, + .enable = nt39016_enable, + .disable = nt39016_disable, + .get_modes = nt39016_get_modes, +}; + +static int nt39016_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct nt39016 *panel; + int err; + + panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL); + if (!panel) + return -ENOMEM; + + panel->dev = dev; + spi_set_drvdata(spi, panel); + + panel->panel_info = of_device_get_match_data(dev); + if (!panel->panel_info) + return -EINVAL; + + panel->supply = devm_regulator_get(dev, "power"); + if (IS_ERR(panel->supply)) { + dev_err(dev, "Failed to get power supply"); + return PTR_ERR(panel->supply); + } + + panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(panel->reset_gpio)) { + dev_err(dev, "Failed to get reset GPIO"); + return PTR_ERR(panel->reset_gpio); + } + + spi->bits_per_word = 8; + spi->mode = SPI_MODE_3 | SPI_3WIRE; + err = spi_setup(spi); + if (err) { + dev_err(dev, "Failed to setup SPI"); + return err; + } + + panel->map = devm_regmap_init_spi(spi, &nt39016_regmap_config); + if (IS_ERR(panel->map)) { + dev_err(dev, "Failed to init regmap"); + return PTR_ERR(panel->map); + } + + panel->backlight = devm_of_find_backlight(dev); + if (IS_ERR(panel->backlight)) { + err = PTR_ERR(panel->backlight); + if (err != -EPROBE_DEFER) + dev_err(dev, "Failed to get backlight handle"); + return err; + } + + drm_panel_init(&panel->drm_panel); + panel->drm_panel.dev = dev; + panel->drm_panel.funcs = &nt39016_funcs; + + err = drm_panel_add(&panel->drm_panel); + if (err < 0) { + dev_err(dev, "Failed to register panel"); + return err; + } + + return 0; +} + +static int nt39016_remove(struct spi_device *spi) +{ + struct nt39016 *panel = spi_get_drvdata(spi); + + drm_panel_remove(&panel->drm_panel); + + nt39016_disable(&panel->drm_panel); + nt39016_unprepare(&panel->drm_panel); + + return 0; +} + +static const struct nt39016_panel_info kd035g6_info = { + .display_mode = { + .clock = 6000, + .hdisplay = 320, + .hsync_start = 320 + 10, + .hsync_end = 320 + 10 + 50, + .htotal = 320 + 10 + 50 + 20, + .vdisplay = 240, + .vsync_start = 240 + 5, + .vsync_end = 240 + 5 + 1, + .vtotal = 240 + 5 + 1 + 4, + .vrefresh = 60, + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, + }, + .width_mm = 71, + .height_mm = 53, + .bus_format = MEDIA_BUS_FMT_RGB888_1X24, + .bus_flags = DRM_BUS_FLAG_PIXDATA_NEGEDGE, +}; + +static const struct of_device_id nt39016_of_match[] = { + { .compatible = "kingdisplay,kd035g6-54nt", .data = &kd035g6_info }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, nt39016_of_match); + +static struct spi_driver nt39016_driver = { + .driver = { + .name = "nt39016", + .of_match_table = nt39016_of_match, + }, + .probe = nt39016_probe, + .remove = nt39016_remove, +}; + +module_spi_driver(nt39016_driver); + +MODULE_AUTHOR("Maarten ter Huurne <maarten@treewalker.org>"); +MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>"); +MODULE_LICENSE("GPL v2"); |