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linux/drivers/gpu/drm/panel/panel-novatek-nt39016.c
Uwe Kleine-König a0386bba70
spi: make remove callback a void function 
The value returned by an spi driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Claudius Heine <ch@denx.de>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Acked-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Acked-by: Łukasz Stelmach <l.stelmach@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220123175201.34839-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-02-09 13:00:45 +00:00

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// 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))
return dev_err_probe(dev, PTR_ERR(panel->supply),
"Failed to get power supply\n");
panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(panel->reset_gpio))
return dev_err_probe(dev, PTR_ERR(panel->reset_gpio), "Failed to get reset GPIO\n");
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)
return dev_err_probe(dev, err, "Failed to get backlight handle\n");
drm_panel_add(&panel->drm_panel);
return 0;
}
static void 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);
}
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");
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