int dsi_panel_set_backlight(struct dsi_panel panel, u32 bl_lvl) { int rc = 0; struct dsi_backlight_config bl = &panel->bl_config; if (panel->host_config.ext_bridge_mode) return 0; DSI_DEBUG("backlight type:%d lvl:%d\n", bl->type, bl_lvl); switch (bl->type) { case DSI_BACKLIGHT_WLED: rc = backlight_device_set_brightness(bl->raw_bd, bl_lvl); break; case DSI_BACKLIGHT_DCS: rc = dsi_panel_update_backlight(panel, bl_lvl); break; case DSI_BACKLIGHT_EXTERNAL: rc = lcd_bl_set_led_brightness(bl_lvl); //pr_err("dsi set bias brightness: %d\n", bl_lvl); rc = lcd_bias_set_led_brightness(bl_lvl); //pr_err("dsi set brightness: %d\n", bl_lvl); break; case DSI_BACKLIGHT_PWM: rc = dsi_panel_update_pwm_backlight(panel, bl_lvl); break; default: DSI_ERR("Backlight type(%d) not supported\n", bl->type); rc = -ENOTSUPP; } return rc; } int lcd_bl_set_led_brightness(int value)//for set bringhtness { dev_warn(&lcd_bl_i2c_client->dev, "lcm 8866 bl = %d\n", value); if (value < 0) { dev_warn(&lcd_bl_i2c_client->dev, "value=%d\n", value); return 0; } if (value > 0) { lcd_bl_write_byte(KTZ8866_DISP_BB_LSB, value & 0x07);// lsb lcd_bl_write_byte(KTZ8866_DISP_BB_MSB, (value >> 3) & 0xFF);// msb lcd_bl_write_byte(KTZ8866_DISP_BL_ENABLE, 0x4F); / BL enabled and Current sink 1/2/3/4 enabled；/ } else { lcd_bl_write_byte(KTZ8866_DISP_BB_LSB, 0x00);// lsb lcd_bl_write_byte(KTZ8866_DISP_BB_MSB, 0x00);// msb lcd_bl_write_byte(KTZ8866_DISP_BL_ENABLE, 0x00); /* BL enabled and Current sink 1/2/3/4 disabled；/ } return 0; } int lcd_bias_set_led_brightness(int value)//for set bringhtness { dev_warn(&lcd_bl_bias_i2c_client->dev, "lcm 8866 bl = %d\n", value); if (value < 0) { dev_warn(&lcd_bl_bias_i2c_client->dev, "invalid value=%d\n", value); return 0; } if (value > 0) { lcd_bl_bias_write_byte(KTZ8866_DISP_BB_LSB, value & 0x07);// lsb lcd_bl_bias_write_byte(KTZ8866_DISP_BB_MSB, (value >> 3) & 0xFF);// msb lcd_bl_bias_write_byte(KTZ8866_DISP_BL_ENABLE, 0x4F); / BL enabled and Current sink 1/2/3/4 enabled；/ } else { lcd_bl_bias_write_byte(KTZ8866_DISP_BB_LSB, 0x00);// lsb lcd_bl_bias_write_byte(KTZ8866_DISP_BB_MSB, 0x00);// msb lcd_bl_bias_write_byte(KTZ8866_DISP_BL_ENABLE, 0x00); / BL enabled and Current sink 1/2/3/4 disabled；*/ } return 0; } dsi_panel_set_backlight、lcd_bl_set_led_brightness和lcd_bias_set_led_brightness源码如上，帮忙用内核线程的方式，同时实现在case DSI_BACKLIGHT_EXTERNAL:下并发执行lcd_bl_set_led_brightness和lcd_bias_set_led_brightness两个函数

好的，我理解你的问题了。你需要用内核线程的方式，在case DSI_BACKLIGHT_EXTERNAL:下并发执行lcd_bl_set_led_brightness和lcd_bias_set_led_brightness两个函数。

为了实现这个目的，你可以创建两个内核线程，一个用于调用lcd_bl_set_led_brightness函数，另一个用于调用lcd_bias_set_led_brightness函数。这两个线程可以同时运行，从而实现并发执行这两个函数的目的。

具体实现方法如下所示：

首先，在dsi_panel_set_backlight函数的case DSI_BACKLIGHT_EXTERNAL:分支下，创建两个内核线程：

case DSI_BACKLIGHT_EXTERNAL:
    {
        int ret1, ret2;
        struct task_struct *thread1 = kthread_run(lcd_bl_thread, (void *)&value, "lcd_bl_thread");
        struct task_struct *thread2 = kthread_run(lcd_bias_thread, (void *)&value, "lcd_bias_thread");

        if (IS_ERR(thread1)) {
            ret1 = PTR_ERR(thread1);
            pr_err("Failed to create lcd_bl_thread: %d\n", ret1);
        }
        if (IS_ERR(thread2)) {
            ret2 = PTR_ERR(thread2);
            pr_err("Failed to create lcd_bias_thread: %d\n", ret2);
        }
        break;
    }

其中，lcd_bl_thread和lcd_bias_thread是两个内核线程的函数，value是传递给这两个函数的参数。

接下来，实现lcd_bl_thread和lcd_bias_thread函数：

static int lcd_bl_thread(void *data)
{
    int value = *(int *)data;
    lcd_bl_set_led_brightness(value);
    return 0;
}

static int lcd_bias_thread(void *data)
{
    int value = *(int *)data;
    lcd_bias_set_led_brightness(value);
    return 0;
}

这两个函数分别调用lcd_bl_set_led_brightness和lcd_bias_set_led_brightness函数，从而实现了并发执行这两个函数的目的。

最后，不要忘记在模块初始化时创建线程：

static int __init my_module_init(void)
{
    // ...
    lcd_bl_thread = kthread_create(lcd_bl_thread, NULL, "lcd_bl_thread");
    lcd_bias_thread = kthread_create(lcd_bias_thread, NULL, "lcd_bias_thread");
    // ...
    return 0;
}

这样，当模块加载时，lcd_bl_thread和lcd_bias_thread线程将被创建，并在需要时被dsi_panel_set_backlight函数调用。