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 error handling at lcd_put_area to prevent hang if irq is disabled but put area is called due to timing issue.

os/board/rtl8730e/src/rtl8730e_mipi_lcdc.c

@@ -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;
@@ -161,6 +163,10 @@ static void rtl8730e_lcd_layer_enable(int layer, bool enable)
 static void rtl8730e_lcd_put_area(u8 *lcd_img_buffer, u32 x_start, u32 y_start, u32 x_end, u32 y_end)
 {
 	irqstate_t flags;
+	/*to prevent hang due to timing issue, if lcd irq is disabled but put_area is called again*/
+	if (lcdc_irq_info.disable_isr) {
+		return;
+	}
 #ifdef CONFIG_PM
 	bsp_pm_domain_control(BSP_MIPI_DRV, 1);
 #endif
@@ -206,6 +212,13 @@ static void rtl8730e_control_backlight(uint8_t level)
 	lcdvdbg("level :%d , pwm level:%f\n", level, pwm_level);
 #if defined(CONFIG_LCD_ST7785) || defined(CONFIG_LCD_ST7701SN)
 	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
 }