// SPDX-License-Identifier: GPL-2.0
/*
* Elida kd35t133 3.5" MIPI-DSI panel driver
* Copyright (C) 2020 Theobroma Systems Design und Consulting GmbH
*
* based on
*
* Rockteck jh057n00900 5.5" MIPI-DSI panel driver
* Copyright (C) Purism SPC 2019
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <video/display_timing.h>
#include <video/mipi_display.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
/* Manufacturer specific Commands send via DSI */
#define KD35T133_CMD_INTERFACEMODECTRL 0xb0
#define KD35T133_CMD_FRAMERATECTRL 0xb1
#define KD35T133_CMD_DISPLAYINVERSIONCTRL 0xb4
#define KD35T133_CMD_DISPLAYFUNCTIONCTRL 0xb6
#define KD35T133_CMD_POWERCONTROL1 0xc0
#define KD35T133_CMD_POWERCONTROL2 0xc1
#define KD35T133_CMD_VCOMCONTROL 0xc5
#define KD35T133_CMD_POSITIVEGAMMA 0xe0
#define KD35T133_CMD_NEGATIVEGAMMA 0xe1
#define KD35T133_CMD_SETIMAGEFUNCTION 0xe9
#define KD35T133_CMD_ADJUSTCONTROL3 0xf7
struct kd35t133 {
struct device *dev;
struct drm_panel panel;
struct gpio_desc *reset_gpio;
struct regulator *vdd;
struct regulator *iovcc;
enum drm_panel_orientation orientation;
};
static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
{
return container_of(panel, struct kd35t133, panel);
}
static int kd35t133_init_sequence(struct kd35t133 *ctx)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
struct device *dev = ctx->dev;
/*
* Init sequence was supplied by the panel vendor with minimal
* documentation.
*/
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POSITIVEGAMMA,
0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_NEGATIVEGAMMA,
0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_POWERCONTROL2, 0x41);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_FRAMERATECTRL, 0xa0);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
0x20, 0x02);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
mipi_dsi_dcs_write_seq(dsi, KD35T133_CMD_ADJUSTCONTROL3,
0xa9, 0x51, 0x2c, 0x82);
mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_INVERT_MODE, NULL, 0);
dev_dbg(dev, "Panel init sequence done\n");
return 0;
}
static int kd35t133_unprepare(struct drm_panel *panel)
{
struct kd35t133 *ctx = panel_to_kd35t133(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
int ret;
ret = mipi_dsi_dcs_set_display_off(dsi);
if (ret < 0)
dev_err(ctx->dev, "failed to set display off: %d\n", ret);
ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
if (ret < 0) {
dev_err(ctx->dev, "failed to enter sleep mode: %d\n", ret);
return ret;
}
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
regulator_disable(ctx->iovcc);
regulator_disable(ctx->vdd);
return 0;
}
static int kd35t133_prepare(struct drm_panel *panel)
{
struct kd35t133 *ctx = panel_to_kd35t133(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
int ret;
dev_dbg(ctx->dev, "Resetting the panel\n");
ret = regulator_enable(ctx->vdd);
if (ret < 0) {
dev_err(ctx->dev, "Failed to enable vdd supply: %d\n", ret);
return ret;
}
ret = regulator_enable(ctx->iovcc);
if (ret < 0) {
dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
goto disable_vdd;
}
msleep(20);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
usleep_range(10, 20);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
msleep(20);
ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret < 0) {
dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
goto disable_iovcc;
}
msleep(250);
ret = kd35t133_init_sequence(ctx);
if (ret < 0) {
dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
goto disable_iovcc;
}
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret < 0) {
dev_err(ctx->dev, "Failed to set display on: %d\n", ret);
goto disable_iovcc;
}
msleep(50);
return 0;
disable_iovcc:
regulator_disable(ctx->iovcc);
disable_vdd:
regulator_disable(ctx->vdd);
return ret;
}
static const struct drm_display_mode default_mode = {
.hdisplay = 320,
.hsync_start = 320 + 130,
.hsync_end = 320 + 130 + 4,
.htotal = 320 + 130 + 4 + 130,
.vdisplay = 480,
.vsync_start = 480 + 2,
.vsync_end = 480 + 2 + 1,
.vtotal = 480 + 2 + 1 + 2,
.clock = 17000,
.width_mm = 42,
.height_mm = 82,
};
static int kd35t133_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct kd35t133 *ctx = panel_to_kd35t133(panel);
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &default_mode);
if (!mode) {
dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
default_mode.hdisplay, default_mode.vdisplay,
drm_mode_vrefresh(&default_mode));
return -ENOMEM;
}
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
drm_mode_probed_add(connector, mode);
return 1;
}
static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
{
struct kd35t133 *ctx = panel_to_kd35t133(panel);
return ctx->orientation;
}
static const struct drm_panel_funcs kd35t133_funcs = {
.unprepare = kd35t133_unprepare,
.prepare = kd35t133_prepare,
.get_modes = kd35t133_get_modes,
.get_orientation = kd35t133_get_orientation,
};
static int kd35t133_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct kd35t133 *ctx;
int ret;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ctx->reset_gpio)) {
dev_err(dev, "cannot get reset gpio\n");
return PTR_ERR(ctx->reset_gpio);
}
ctx->vdd = devm_regulator_get(dev, "vdd");
if (IS_ERR(ctx->vdd)) {
ret = PTR_ERR(ctx->vdd);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Failed to request vdd regulator: %d\n", ret);
return ret;
}
ctx->iovcc = devm_regulator_get(dev, "iovcc");
if (IS_ERR(ctx->iovcc)) {
ret = PTR_ERR(ctx->iovcc);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
return ret;
}
ret = of_drm_get_panel_orientation(dev->of_node, &ctx->orientation);
if (ret < 0) {
dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, ret);
return ret;
}
mipi_dsi_set_drvdata(dsi, ctx);
ctx->dev = dev;
dsi->lanes = 1;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET |
MIPI_DSI_CLOCK_NON_CONTINUOUS;
drm_panel_init(&ctx->panel, &dsi->dev, &kd35t133_funcs,
DRM_MODE_CONNECTOR_DSI);
ret = drm_panel_of_backlight(&ctx->panel);
if (ret)
return ret;
drm_panel_add(&ctx->panel);
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
drm_panel_remove(&ctx->panel);
return ret;
}
return 0;
}
static void kd35t133_remove(struct mipi_dsi_device *dsi)
{
struct kd35t133 *ctx = mipi_dsi_get_drvdata(dsi);
int ret;
ret = mipi_dsi_detach(dsi);
if (ret < 0)
dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
drm_panel_remove(&ctx->panel);
}
static const struct of_device_id kd35t133_of_match[] = {
{ .compatible = "elida,kd35t133" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, kd35t133_of_match);
static struct mipi_dsi_driver kd35t133_driver = {
.driver = {
.name = "panel-elida-kd35t133",
.of_match_table = kd35t133_of_match,
},
.probe = kd35t133_probe,
.remove = kd35t133_remove,
};
module_mipi_dsi_driver(kd35t133_driver);
MODULE_AUTHOR("Heiko Stuebner <[email protected]>");
MODULE_DESCRIPTION("DRM driver for Elida kd35t133 MIPI DSI panel");
MODULE_LICENSE("GPL v2");
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