mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-24 03:24:55 +08:00
d738005da9
There is already a 'struct device' pointer in the drm_panel structure, that we can access easily from our priv structure, so there's no need for a separate 'dev' field there. Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://patchwork.freedesktop.org/patch/msgid/20200820121256.32037-3-paul@crapouillou.net
369 lines
9.0 KiB
C
369 lines
9.0 KiB
C
// 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/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 {
|
|
const struct drm_display_mode *display_modes;
|
|
unsigned int num_modes;
|
|
u16 width_mm, height_mm;
|
|
u32 bus_format, bus_flags;
|
|
};
|
|
|
|
struct nt39016 {
|
|
struct drm_panel drm_panel;
|
|
struct regmap *map;
|
|
struct regulator *supply;
|
|
const struct nt39016_panel_info *panel_info;
|
|
|
|
struct gpio_desc *reset_gpio;
|
|
};
|
|
|
|
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(drm_panel->dev, "Failed to enable power supply: %d\n", 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(drm_panel->dev, "Failed to init registers: %d\n", 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(drm_panel->dev, "Unable to enable panel: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (drm_panel->backlight) {
|
|
/* Wait for the picture to be ready before enabling backlight */
|
|
msleep(150);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nt39016_disable(struct drm_panel *drm_panel)
|
|
{
|
|
struct nt39016 *panel = to_nt39016(drm_panel);
|
|
int err;
|
|
|
|
err = regmap_write(panel->map, NT39016_REG_SYSTEM,
|
|
NT39016_SYSTEM_RESET_N);
|
|
if (err) {
|
|
dev_err(drm_panel->dev, "Unable to disable panel: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nt39016_get_modes(struct drm_panel *drm_panel,
|
|
struct drm_connector *connector)
|
|
{
|
|
struct nt39016 *panel = to_nt39016(drm_panel);
|
|
const struct nt39016_panel_info *panel_info = panel->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 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;
|
|
|
|
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\n");
|
|
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\n");
|
|
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\n");
|
|
return err;
|
|
}
|
|
|
|
panel->map = devm_regmap_init_spi(spi, &nt39016_regmap_config);
|
|
if (IS_ERR(panel->map)) {
|
|
dev_err(dev, "Failed to init regmap\n");
|
|
return PTR_ERR(panel->map);
|
|
}
|
|
|
|
drm_panel_init(&panel->drm_panel, dev, &nt39016_funcs,
|
|
DRM_MODE_CONNECTOR_DPI);
|
|
|
|
err = drm_panel_of_backlight(&panel->drm_panel);
|
|
if (err) {
|
|
if (err != -EPROBE_DEFER)
|
|
dev_err(dev, "Failed to get backlight handle\n");
|
|
return err;
|
|
}
|
|
|
|
drm_panel_add(&panel->drm_panel);
|
|
|
|
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 drm_display_mode kd035g6_display_modes[] = {
|
|
{ /* 60 Hz */
|
|
.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,
|
|
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
|
|
},
|
|
{ /* 50 Hz */
|
|
.clock = 5400,
|
|
.hdisplay = 320,
|
|
.hsync_start = 320 + 42,
|
|
.hsync_end = 320 + 42 + 50,
|
|
.htotal = 320 + 42 + 50 + 20,
|
|
.vdisplay = 240,
|
|
.vsync_start = 240 + 5,
|
|
.vsync_end = 240 + 5 + 1,
|
|
.vtotal = 240 + 5 + 1 + 4,
|
|
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
|
|
},
|
|
};
|
|
|
|
static const struct nt39016_panel_info kd035g6_info = {
|
|
.display_modes = kd035g6_display_modes,
|
|
.num_modes = ARRAY_SIZE(kd035g6_display_modes),
|
|
.width_mm = 71,
|
|
.height_mm = 53,
|
|
.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
|
|
.bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
|
|
};
|
|
|
|
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");
|