os/board/rtl8730e/src: disable unnecessary IRQ when backlight power OFF

1. LCDC irq can be disabled when backlight power OFF
2. MIPI irq cannot be disabled because it is required to send cmd to turn backlight power ON, eg: ioctl(fd, LCDDEVIO_SETPOWER, x) where x >0
3. add domain lock when backlight is > 0 (ON), and only release the lock when backlight == 0 (OFF).

os/board/rtl8730e/src/rtl8730e_mipi_lcdc.c

@@ -46,7 +46,7 @@
 #define GPIO_PIN_BACKLIGHT
 #define MIPI_GPIO_RESET_PIN 	PA_14
 #endif
-
+static volatile bool pm_lock_status = 0;
 struct rtl8730e_lcdc_info_s {
 	struct mipi_lcd_config_s lcd_config;
 	pwmout_t pwm_led;
@@ -81,6 +81,7 @@ struct irq {
 	u32 num;
 	u32 data;
 	u32 priority;
+	bool disable_isr;
 };
 
 LCDC_TypeDef *pLCDC = LCDC;
@@ -93,6 +94,7 @@ struct irq lcdc_irq_info = {
 	.num = LCDC_IRQ,
 	.data = (u32) LCDC,
 	.priority = INT_PRI_HIGH,
+	.disable_isr = 0,
 };
 
 extern struct irq mipi_irq_info;
@@ -205,7 +207,23 @@ static void rtl8730e_control_backlight(uint8_t level)
 	float pwm_level = level/100.0;
 	lcdvdbg("level :%d , pwm level:%f\n", level, pwm_level);
 #if defined(CONFIG_LCD_ST7785) || defined(CONFIG_LCD_ST7701SN)
+#ifdef CONFIG_PM
+	if (level != 0 && !pm_lock_status) {	/* backlight ON, we should lock domain */
+		bsp_pm_domain_control(BSP_MIPI_DRV, 1);
+		pm_lock_status = 1;
+	} else if (level == 0 && pm_lock_status) { /* backlight OFF, we should release lock*/
+		bsp_pm_domain_control(BSP_MIPI_DRV, 0);
+		pm_lock_status = 0;
+	}
+#endif
 	pwmout_write(&g_rtl8730e_config_dev_s.pwm_led, 1.0-pwm_level);
+	if (level == 0 && !(lcdc_irq_info.disable_isr)) {
+		InterruptDis(lcdc_irq_info.num);
+		lcdc_irq_info.disable_isr = 1;
+	} else if (level != 0 && lcdc_irq_info.disable_isr) {
+		InterruptEn(lcdc_irq_info.num, lcdc_irq_info.priority);
+		lcdc_irq_info.disable_isr = 0;
+	}
 #endif
 }