361 lines
8.9 KiB
C
361 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Novatek NT39016 TFT LCD panel driver
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*
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* Copyright (C) 2017, Maarten ter Huurne <maarten@treewalker.org>
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* Copyright (C) 2019, Paul Cercueil <paul@crapouillou.net>
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/media-bus-format.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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enum nt39016_regs {
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NT39016_REG_SYSTEM,
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NT39016_REG_TIMING,
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NT39016_REG_OP,
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NT39016_REG_DATA_IN,
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NT39016_REG_SRC_TIMING_DELAY,
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NT39016_REG_GATE_TIMING_DELAY,
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NT39016_REG_RESERVED,
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NT39016_REG_INITIAL_FUNC,
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NT39016_REG_CONTRAST,
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NT39016_REG_BRIGHTNESS,
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NT39016_REG_HUE_SATURATION,
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NT39016_REG_RB_SUBCONTRAST,
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NT39016_REG_R_SUBBRIGHTNESS,
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NT39016_REG_B_SUBBRIGHTNESS,
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NT39016_REG_VCOMDC,
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NT39016_REG_VCOMAC,
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NT39016_REG_VGAM2,
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NT39016_REG_VGAM34,
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NT39016_REG_VGAM56,
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NT39016_REG_VCOMDC_TRIM = 0x1e,
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NT39016_REG_DISPLAY_MODE = 0x20,
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};
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#define NT39016_SYSTEM_RESET_N BIT(0)
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#define NT39016_SYSTEM_STANDBY BIT(1)
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struct nt39016_panel_info {
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const struct drm_display_mode *display_modes;
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unsigned int num_modes;
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u16 width_mm, height_mm;
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u32 bus_format, bus_flags;
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};
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struct nt39016 {
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struct drm_panel drm_panel;
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struct regmap *map;
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struct regulator *supply;
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const struct nt39016_panel_info *panel_info;
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struct gpio_desc *reset_gpio;
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};
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static inline struct nt39016 *to_nt39016(struct drm_panel *panel)
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{
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return container_of(panel, struct nt39016, drm_panel);
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}
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#define RV(REG, VAL) { .reg = (REG), .def = (VAL), .delay_us = 2 }
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static const struct reg_sequence nt39016_panel_regs[] = {
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RV(NT39016_REG_SYSTEM, 0x00),
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RV(NT39016_REG_TIMING, 0x00),
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RV(NT39016_REG_OP, 0x03),
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RV(NT39016_REG_DATA_IN, 0xCC),
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RV(NT39016_REG_SRC_TIMING_DELAY, 0x46),
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RV(NT39016_REG_GATE_TIMING_DELAY, 0x05),
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RV(NT39016_REG_RESERVED, 0x00),
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RV(NT39016_REG_INITIAL_FUNC, 0x00),
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RV(NT39016_REG_CONTRAST, 0x08),
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RV(NT39016_REG_BRIGHTNESS, 0x40),
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RV(NT39016_REG_HUE_SATURATION, 0x88),
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RV(NT39016_REG_RB_SUBCONTRAST, 0x88),
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RV(NT39016_REG_R_SUBBRIGHTNESS, 0x20),
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RV(NT39016_REG_B_SUBBRIGHTNESS, 0x20),
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RV(NT39016_REG_VCOMDC, 0x67),
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RV(NT39016_REG_VCOMAC, 0xA4),
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RV(NT39016_REG_VGAM2, 0x04),
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RV(NT39016_REG_VGAM34, 0x24),
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RV(NT39016_REG_VGAM56, 0x24),
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RV(NT39016_REG_DISPLAY_MODE, 0x00),
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};
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#undef RV
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static const struct regmap_range nt39016_regmap_no_ranges[] = {
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regmap_reg_range(0x13, 0x1D),
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regmap_reg_range(0x1F, 0x1F),
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};
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static const struct regmap_access_table nt39016_regmap_access_table = {
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.no_ranges = nt39016_regmap_no_ranges,
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.n_no_ranges = ARRAY_SIZE(nt39016_regmap_no_ranges),
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};
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static const struct regmap_config nt39016_regmap_config = {
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.reg_bits = 6,
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.pad_bits = 2,
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.val_bits = 8,
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.max_register = NT39016_REG_DISPLAY_MODE,
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.wr_table = &nt39016_regmap_access_table,
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.write_flag_mask = 0x02,
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.cache_type = REGCACHE_FLAT,
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};
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static int nt39016_prepare(struct drm_panel *drm_panel)
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{
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struct nt39016 *panel = to_nt39016(drm_panel);
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int err;
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err = regulator_enable(panel->supply);
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if (err) {
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dev_err(drm_panel->dev, "Failed to enable power supply: %d\n", err);
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return err;
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}
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/*
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* Reset the NT39016.
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* The documentation says the reset pulse should be at least 40 us to
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* pass the glitch filter, but when testing I see some resets fail and
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* some succeed when using a 70 us delay, so we use 100 us instead.
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*/
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gpiod_set_value_cansleep(panel->reset_gpio, 1);
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usleep_range(100, 1000);
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gpiod_set_value_cansleep(panel->reset_gpio, 0);
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udelay(2);
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/* Init all registers. */
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err = regmap_multi_reg_write(panel->map, nt39016_panel_regs,
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ARRAY_SIZE(nt39016_panel_regs));
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if (err) {
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dev_err(drm_panel->dev, "Failed to init registers: %d\n", err);
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goto err_disable_regulator;
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}
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return 0;
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err_disable_regulator:
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regulator_disable(panel->supply);
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return err;
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}
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static int nt39016_unprepare(struct drm_panel *drm_panel)
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{
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struct nt39016 *panel = to_nt39016(drm_panel);
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gpiod_set_value_cansleep(panel->reset_gpio, 1);
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regulator_disable(panel->supply);
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return 0;
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}
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static int nt39016_enable(struct drm_panel *drm_panel)
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{
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struct nt39016 *panel = to_nt39016(drm_panel);
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int ret;
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ret = regmap_write(panel->map, NT39016_REG_SYSTEM,
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NT39016_SYSTEM_RESET_N | NT39016_SYSTEM_STANDBY);
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if (ret) {
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dev_err(drm_panel->dev, "Unable to enable panel: %d\n", ret);
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return ret;
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}
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if (drm_panel->backlight) {
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/* Wait for the picture to be ready before enabling backlight */
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msleep(150);
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}
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return 0;
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}
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static int nt39016_disable(struct drm_panel *drm_panel)
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{
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struct nt39016 *panel = to_nt39016(drm_panel);
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int err;
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err = regmap_write(panel->map, NT39016_REG_SYSTEM,
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NT39016_SYSTEM_RESET_N);
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if (err) {
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dev_err(drm_panel->dev, "Unable to disable panel: %d\n", err);
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return err;
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}
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return 0;
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}
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static int nt39016_get_modes(struct drm_panel *drm_panel,
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struct drm_connector *connector)
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{
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struct nt39016 *panel = to_nt39016(drm_panel);
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const struct nt39016_panel_info *panel_info = panel->panel_info;
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struct drm_display_mode *mode;
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unsigned int i;
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for (i = 0; i < panel_info->num_modes; i++) {
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mode = drm_mode_duplicate(connector->dev,
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&panel_info->display_modes[i]);
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if (!mode)
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return -ENOMEM;
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drm_mode_set_name(mode);
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mode->type = DRM_MODE_TYPE_DRIVER;
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if (panel_info->num_modes == 1)
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mode->type |= DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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}
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connector->display_info.bpc = 8;
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connector->display_info.width_mm = panel_info->width_mm;
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connector->display_info.height_mm = panel_info->height_mm;
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drm_display_info_set_bus_formats(&connector->display_info,
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&panel_info->bus_format, 1);
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connector->display_info.bus_flags = panel_info->bus_flags;
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return panel_info->num_modes;
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}
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static const struct drm_panel_funcs nt39016_funcs = {
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.prepare = nt39016_prepare,
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.unprepare = nt39016_unprepare,
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.enable = nt39016_enable,
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.disable = nt39016_disable,
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.get_modes = nt39016_get_modes,
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};
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static int nt39016_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct nt39016 *panel;
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int err;
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panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
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if (!panel)
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return -ENOMEM;
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spi_set_drvdata(spi, panel);
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panel->panel_info = of_device_get_match_data(dev);
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if (!panel->panel_info)
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return -EINVAL;
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panel->supply = devm_regulator_get(dev, "power");
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if (IS_ERR(panel->supply))
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return dev_err_probe(dev, PTR_ERR(panel->supply),
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"Failed to get power supply\n");
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panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(panel->reset_gpio))
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return dev_err_probe(dev, PTR_ERR(panel->reset_gpio), "Failed to get reset GPIO\n");
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spi->bits_per_word = 8;
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spi->mode = SPI_MODE_3 | SPI_3WIRE;
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err = spi_setup(spi);
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if (err) {
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dev_err(dev, "Failed to setup SPI\n");
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return err;
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}
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panel->map = devm_regmap_init_spi(spi, &nt39016_regmap_config);
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if (IS_ERR(panel->map)) {
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dev_err(dev, "Failed to init regmap\n");
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return PTR_ERR(panel->map);
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}
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drm_panel_init(&panel->drm_panel, dev, &nt39016_funcs,
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DRM_MODE_CONNECTOR_DPI);
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err = drm_panel_of_backlight(&panel->drm_panel);
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if (err)
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return dev_err_probe(dev, err, "Failed to get backlight handle\n");
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drm_panel_add(&panel->drm_panel);
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return 0;
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}
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static void nt39016_remove(struct spi_device *spi)
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{
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struct nt39016 *panel = spi_get_drvdata(spi);
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drm_panel_remove(&panel->drm_panel);
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nt39016_disable(&panel->drm_panel);
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nt39016_unprepare(&panel->drm_panel);
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}
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static const struct drm_display_mode kd035g6_display_modes[] = {
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{ /* 60 Hz */
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.clock = 6000,
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.hdisplay = 320,
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.hsync_start = 320 + 10,
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.hsync_end = 320 + 10 + 50,
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.htotal = 320 + 10 + 50 + 20,
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.vdisplay = 240,
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.vsync_start = 240 + 5,
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.vsync_end = 240 + 5 + 1,
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.vtotal = 240 + 5 + 1 + 4,
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.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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},
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{ /* 50 Hz */
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.clock = 5400,
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.hdisplay = 320,
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.hsync_start = 320 + 42,
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.hsync_end = 320 + 42 + 50,
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.htotal = 320 + 42 + 50 + 20,
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.vdisplay = 240,
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.vsync_start = 240 + 5,
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.vsync_end = 240 + 5 + 1,
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.vtotal = 240 + 5 + 1 + 4,
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.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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},
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};
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static const struct nt39016_panel_info kd035g6_info = {
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.display_modes = kd035g6_display_modes,
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.num_modes = ARRAY_SIZE(kd035g6_display_modes),
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.width_mm = 71,
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.height_mm = 53,
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.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
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.bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
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};
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static const struct of_device_id nt39016_of_match[] = {
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{ .compatible = "kingdisplay,kd035g6-54nt", .data = &kd035g6_info },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, nt39016_of_match);
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static struct spi_driver nt39016_driver = {
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.driver = {
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.name = "nt39016",
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.of_match_table = nt39016_of_match,
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},
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.probe = nt39016_probe,
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.remove = nt39016_remove,
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};
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module_spi_driver(nt39016_driver);
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MODULE_AUTHOR("Maarten ter Huurne <maarten@treewalker.org>");
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MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
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MODULE_LICENSE("GPL v2");
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