// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 InforceComputing
* Copyright (C) 2016 Linaro Ltd
* Copyright (C) 2023 BayLibre, SAS
*
* Authors:
* - Vinay Simha BN <[email protected]>
* - Sumit Semwal <[email protected]>
* - Guillaume La Roque <[email protected]>
*
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#define DSI_REG_MCAP 0xb0
#define DSI_REG_IS 0xb3 /* Interface Setting */
#define DSI_REG_IIS 0xb4 /* Interface ID Setting */
#define DSI_REG_CTRL 0xb6
enum {
IOVCC = 0,
POWER = 1
};
struct stk_panel {
const struct drm_display_mode *mode;
struct backlight_device *backlight;
struct drm_panel base;
struct gpio_desc *enable_gpio; /* Power IC supply enable */
struct gpio_desc *reset_gpio; /* External reset */
struct mipi_dsi_device *dsi;
struct regulator_bulk_data supplies[2];
};
static inline struct stk_panel *to_stk_panel(struct drm_panel *panel)
{
return container_of(panel, struct stk_panel, base);
}
static int stk_panel_init(struct stk_panel *stk)
{
struct mipi_dsi_device *dsi = stk->dsi;
struct mipi_dsi_multi_context dsi_ctx = {.dsi = dsi};
mipi_dsi_dcs_soft_reset_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 5);
mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 120);
mipi_dsi_generic_write_seq_multi(&dsi_ctx, DSI_REG_MCAP, 0x04);
/* Interface setting, video mode */
mipi_dsi_generic_write_seq_multi(&dsi_ctx, DSI_REG_IS, 0x14, 0x08, 0x00, 0x22, 0x00);
mipi_dsi_generic_write_seq_multi(&dsi_ctx, DSI_REG_IIS, 0x0c, 0x00);
mipi_dsi_generic_write_seq_multi(&dsi_ctx, DSI_REG_CTRL, 0x3a, 0xd3);
mipi_dsi_dcs_set_display_brightness_multi(&dsi_ctx, 0x77);
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
MIPI_DCS_WRITE_MEMORY_START);
mipi_dsi_dcs_set_pixel_format_multi(&dsi_ctx, 0x77);
mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0, stk->mode->hdisplay - 1);
mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0, stk->mode->vdisplay - 1);
return dsi_ctx.accum_err;
}
static int stk_panel_on(struct stk_panel *stk)
{
struct mipi_dsi_device *dsi = stk->dsi;
struct mipi_dsi_multi_context dsi_ctx = {.dsi = dsi};
mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 20);
return dsi_ctx.accum_err;
}
static void stk_panel_off(struct stk_panel *stk)
{
struct mipi_dsi_device *dsi = stk->dsi;
struct mipi_dsi_multi_context dsi_ctx = {.dsi = dsi};
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 100);
}
static int stk_panel_unprepare(struct drm_panel *panel)
{
struct stk_panel *stk = to_stk_panel(panel);
stk_panel_off(stk);
regulator_bulk_disable(ARRAY_SIZE(stk->supplies), stk->supplies);
gpiod_set_value(stk->reset_gpio, 0);
gpiod_set_value(stk->enable_gpio, 1);
return 0;
}
static int stk_panel_prepare(struct drm_panel *panel)
{
struct stk_panel *stk = to_stk_panel(panel);
int ret;
gpiod_set_value(stk->reset_gpio, 0);
gpiod_set_value(stk->enable_gpio, 0);
ret = regulator_enable(stk->supplies[IOVCC].consumer);
if (ret < 0)
return ret;
mdelay(8);
ret = regulator_enable(stk->supplies[POWER].consumer);
if (ret < 0)
goto iovccoff;
mdelay(20);
gpiod_set_value(stk->enable_gpio, 1);
mdelay(20);
gpiod_set_value(stk->reset_gpio, 1);
mdelay(10);
ret = stk_panel_init(stk);
if (ret < 0)
goto poweroff;
ret = stk_panel_on(stk);
if (ret < 0)
goto poweroff;
return 0;
poweroff:
regulator_disable(stk->supplies[POWER].consumer);
iovccoff:
regulator_disable(stk->supplies[IOVCC].consumer);
gpiod_set_value(stk->reset_gpio, 0);
gpiod_set_value(stk->enable_gpio, 0);
return ret;
}
static const struct drm_display_mode default_mode = {
.clock = 163204,
.hdisplay = 1200,
.hsync_start = 1200 + 144,
.hsync_end = 1200 + 144 + 16,
.htotal = 1200 + 144 + 16 + 45,
.vdisplay = 1920,
.vsync_start = 1920 + 8,
.vsync_end = 1920 + 8 + 4,
.vtotal = 1920 + 8 + 4 + 4,
.width_mm = 95,
.height_mm = 151,
};
static int stk_panel_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &default_mode);
if (!mode) {
dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
default_mode.hdisplay, default_mode.vdisplay,
drm_mode_vrefresh(&default_mode));
return -ENOMEM;
}
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = default_mode.width_mm;
connector->display_info.height_mm = default_mode.height_mm;
return 1;
}
static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
int ret;
u16 brightness;
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
if (ret < 0)
return ret;
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
return brightness & 0xff;
}
static int dsi_dcs_bl_update_status(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
struct mipi_dsi_multi_context dsi_ctx = {.dsi = dsi};
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_set_display_brightness_multi(&dsi_ctx, bl->props.brightness);
if (dsi_ctx.accum_err)
return dsi_ctx.accum_err;
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
return dsi_ctx.accum_err;
}
static const struct backlight_ops dsi_bl_ops = {
.update_status = dsi_dcs_bl_update_status,
.get_brightness = dsi_dcs_bl_get_brightness,
};
static struct backlight_device *
drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = 255,
.max_brightness = 255,
};
return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
&dsi_bl_ops, &props);
}
static const struct drm_panel_funcs stk_panel_funcs = {
.unprepare = stk_panel_unprepare,
.prepare = stk_panel_prepare,
.get_modes = stk_panel_get_modes,
};
static const struct of_device_id stk_of_match[] = {
{ .compatible = "startek,kd070fhfid015", },
{ }
};
MODULE_DEVICE_TABLE(of, stk_of_match);
static int stk_panel_add(struct stk_panel *stk)
{
struct device *dev = &stk->dsi->dev;
int ret;
stk->mode = &default_mode;
stk->supplies[IOVCC].supply = "iovcc";
stk->supplies[POWER].supply = "power";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(stk->supplies), stk->supplies);
if (ret) {
dev_err(dev, "regulator_bulk failed\n");
return ret;
}
stk->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(stk->reset_gpio)) {
ret = PTR_ERR(stk->reset_gpio);
dev_err(dev, "cannot get reset-gpios %d\n", ret);
return ret;
}
stk->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(stk->enable_gpio)) {
ret = PTR_ERR(stk->enable_gpio);
dev_err(dev, "cannot get enable-gpio %d\n", ret);
return ret;
}
stk->backlight = drm_panel_create_dsi_backlight(stk->dsi);
if (IS_ERR(stk->backlight)) {
ret = PTR_ERR(stk->backlight);
dev_err(dev, "failed to register backlight %d\n", ret);
return ret;
}
drm_panel_init(&stk->base, &stk->dsi->dev, &stk_panel_funcs,
DRM_MODE_CONNECTOR_DSI);
drm_panel_add(&stk->base);
return 0;
}
static int stk_panel_probe(struct mipi_dsi_device *dsi)
{
struct stk_panel *stk;
int ret;
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = (MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM);
stk = devm_kzalloc(&dsi->dev, sizeof(*stk), GFP_KERNEL);
if (!stk)
return -ENOMEM;
mipi_dsi_set_drvdata(dsi, stk);
stk->dsi = dsi;
ret = stk_panel_add(stk);
if (ret < 0)
return ret;
ret = mipi_dsi_attach(dsi);
if (ret < 0)
drm_panel_remove(&stk->base);
return 0;
}
static void stk_panel_remove(struct mipi_dsi_device *dsi)
{
struct stk_panel *stk = mipi_dsi_get_drvdata(dsi);
int err;
err = mipi_dsi_detach(dsi);
if (err < 0)
dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
err);
drm_panel_remove(&stk->base);
}
static struct mipi_dsi_driver stk_panel_driver = {
.driver = {
.name = "panel-startek-kd070fhfid015",
.of_match_table = stk_of_match,
},
.probe = stk_panel_probe,
.remove = stk_panel_remove,
};
module_mipi_dsi_driver(stk_panel_driver);
MODULE_AUTHOR("Guillaume La Roque <[email protected]>");
MODULE_DESCRIPTION("STARTEK KD070FHFID015");
MODULE_LICENSE("GPL");
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