diff --git a/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi b/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
--- a/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
+++ b/layers/meta-unisoc/recipes-kernel/linux/linux-unisoc-5.4/uis7885/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
@@ -42,9 +42,9 @@
 							hfront-porch = <88>;
 							hsync-len = <44>;
 							hback-porch = <148>;
-							vfront-porch = <56>;
-							vsync-len = <6>;
-							vback-porch = <60>;
+							vfront-porch = <4>;
+							vsync-len = <5>;
+							vback-porch = <36>;
 						};
 					};
 				};
diff --git a/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi b/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
--- a/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
+++ b/source/kernel/kernel5.4/arch/arm64/boot/dts/sprd/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
@@ -42,9 +42,9 @@
 							hfront-porch = <88>;
 							hsync-len = <44>;
 							hback-porch = <148>;
-							vfront-porch = <56>;
-							vsync-len = <6>;
-							vback-porch = <60>;
+							vfront-porch = <4>;
+							vsync-len = <5>;
+							vback-porch = <36>;
 						};
 					};
 				};
diff --git a/source/bsp/u-boot22/arch/arm/dts/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi b/source/bsp/u-boot22/arch/arm/dts/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
--- a/source/bsp/u-boot22/arch/arm/dts/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
+++ b/source/bsp/u-boot22/arch/arm/dts/lcd/lcd_lt8912b_mipi_hdmi_1080p.dtsi
@@ -47,9 +47,9 @@
 					hfront-porch = <88>;
 					hsync-len = <44>;
 					hback-porch = <148>;
-					vfront-porch = <56>;
+					vfront-porch = <38>;
 					vsync-len = <6>;
-					vback-porch = <60>;
+					vback-porch = <40>;
 				};
 			};
 		};
diff --git a/source/kernel/kernel5.4/drivers/video/LT8912B/src/LT8912B.c b/source/kernel/kernel5.4/drivers/video/LT8912B/src/LT8912B.c
--- a/source/kernel/kernel5.4/drivers/video/LT8912B/src/LT8912B.c
+++ b/source/kernel/kernel5.4/drivers/video/LT8912B/src/LT8912B.c
@@ -9,6 +9,7 @@
 u8 Hsync_L, Hsync_H, Vsync_L, Vsync_H;
 u8 mipi_det_fail_count = 0;
 u8 mipi_relock_count = 0;
+bool mipi_video_ready = 0;
 
 
 bool suspend_on = 0;
@@ -24,11 +25,13 @@
 struct video_timing video_1280x720_60Hz    =    {110, 40, 220, 1280, 1650,   5,  5,  20,  720,  750,  1,1, 4, AR_16_9, 74250};
 struct video_timing video_1280x800_60Hz    =    {28,  32, 100, 1280, 1440,   2,  6,  15,  800,  823,  0,0, 0, AR_16_9, 71000};
 //struct video_timing video_1920x1080_60Hz   =    {88,  44, 148, 1920, 2200,   4,  5,  36, 1080, 1125,  1,1,16, AR_16_9, 148500};
-struct video_timing video_1920x1080_60Hz  =    {88,  44, 148, 1920, 2200,   56,  6,  60, 1080, 1202,  1,1, 0, AR_16_9, 153600};
+struct video_timing video_1920x1080_60Hz  =    {88,  44, 148, 1920, 2200,   4,  5,  36, 1080, 1125,  1,1,16, AR_16_9, 153600};
 
 struct video_timing *video;
 
-void DDSConfig(void);
+void DDSConfig(struct video_timing *video_format);
+void HdmiOutput(bool on);
+u8 LT8912_Get_HPD(void);
 
 void DigitalClockEn(void)
 {
@@ -72,25 +75,66 @@
 {
 	u8 VIC = video_format->vic;
 	u8 AR = video_format->aspact_ratio;
-	u8 pb0,pb2,pb4,Sync_Polarity;
+	u8 pb0,pb1,pb2,pb4,Sync_Polarity;
+	u8 pb6, pb7, pb8, pb9, pb10, pb11, pb12, pb13;
+	u8 checksum;
 	
  	I2CADR = 0x94;
 	HDMI_WriteI2C_Byte(0x3c,0x41); //enable null package
 	
 	Sync_Polarity = (video_format->h_polarity*0x02) + (video_format->v_polarity*0x01);
-	pb2 =  (AR<<4) + 0x08;
-	pb4 =  VIC;
-	pb0 = (((pb2 + pb4) <= 0x5f)?(0x5f - pb2 - pb4):(0x15f - pb2 - pb4));
+	if (video_format->hact == 1920 && video_format->vact == 1080) {
+		Sync_Polarity = 0x03;
+		pb1 = 0x1c;
+		pb2 = 0xa8;
+		pb4 = 0x10;
+		pb6 = 0x29;
+		pb7 = 0x00;
+		pb8 = 0x61;
+		pb9 = 0x04;
+		pb10 = 0xc0;
+		pb11 = 0x00;
+		pb12 = 0x40;
+		pb13 = 0x08;
+	} else {
+		pb1 = 0x10;
+		pb2 =  (AR<<4) + 0x08;
+		pb4 =  VIC;
+		pb6 = 0x00;
+		pb7 = 0x00;
+		pb8 = 0x00;
+		pb9 = 0x00;
+		pb10 = 0x00;
+		pb11 = 0x00;
+		pb12 = 0x00;
+		pb13 = 0x00;
+	}
+
+	checksum = 0x82 + 0x02 + 0x0d + pb1 + pb2 + pb4;
+	checksum += pb6 + pb7 + pb8 + pb9;
+	checksum += pb10 + pb11 + pb12 + pb13;
+	pb0 = 0x100 - checksum;
 	
 	I2CADR = 0x90;
     HDMI_WriteI2C_Byte(0xab,Sync_Polarity); //sync polarity
 	
 	I2CADR = 0x94;
 	HDMI_WriteI2C_Byte(0x43,pb0);	  //PB0:check sum
-	HDMI_WriteI2C_Byte(0x44,0x10);	//PB1:RGB888
+	HDMI_WriteI2C_Byte(0x44,pb1);	//PB1
 	HDMI_WriteI2C_Byte(0x45,pb2);	  //PB2
 	HDMI_WriteI2C_Byte(0x46,0x00);	//PB3
 	HDMI_WriteI2C_Byte(0x47,pb4);	  //PB4:vic
+	HDMI_WriteI2C_Byte(0x49,pb6);
+	HDMI_WriteI2C_Byte(0x4a,pb7);
+	HDMI_WriteI2C_Byte(0x4b,pb8);
+	HDMI_WriteI2C_Byte(0x4c,pb9);
+	HDMI_WriteI2C_Byte(0x4d,pb10);
+	HDMI_WriteI2C_Byte(0x4e,pb11);
+	HDMI_WriteI2C_Byte(0x4f,pb12);
+	HDMI_WriteI2C_Byte(0x50,pb13);
+	printk("%s AviInfoframe %ux%u pb0=0x%02x pb1=0x%02x pb2=0x%02x vic=%u sync=0x%02x\n",
+	       LOG_FLAG, video_format->hact, video_format->vact,
+	       pb0, pb1, pb2, pb4, Sync_Polarity);
 }
 
 void MipiAnalog(void)
@@ -128,7 +172,13 @@
 
 void MIPI_Video_Setup(struct video_timing *video_format)
 {
+	u8 settle = 0x10;
+
+	if (video_format->vact == 1080)
+		settle = 0x0a;
+
 	I2CADR = 0x92;
+	HDMI_WriteI2C_Byte(0x11, settle); // settle
 	HDMI_WriteI2C_Byte(0x18,(u8)(video_format->hs%256)); // hwidth
 	HDMI_WriteI2C_Byte(0x19,(u8)(video_format->vs%256)); // vwidth
 	HDMI_WriteI2C_Byte(0x1c,(u8)(video_format->hact%256)); // H_active[7:0]
@@ -146,6 +196,10 @@
 	HDMI_WriteI2C_Byte(0x3d,(u8)(video_format->hbp/256)); // HBP[15:8]
 	HDMI_WriteI2C_Byte(0x3e,(u8)(video_format->hfp%256)); // HFP[7:0]
 	HDMI_WriteI2C_Byte(0x3f,(u8)(video_format->hfp/256)); // HFP[15:8]
+	printk("%s MIPI_Video_Setup %ux%u total=%ux%u pclk=%u settle=0x%02x vic=%u\n",
+	       LOG_FLAG, video_format->hact, video_format->vact,
+	       video_format->htotal, video_format->vtotal,
+	       video_format->pclk_khz, settle, video_format->vic);
     video = video_format;
 }
 
@@ -168,19 +222,26 @@
 
 	MipiAnalog();
 	MipiBasicSet();
-	DDSConfig();
+	DDSConfig(&video_1920x1080_60Hz);
 	MIPI_Video_Setup(&video_1920x1080_60Hz);
 	AviInfoframe(&video_1920x1080_60Hz);
 	MIPIRxLogicRes();
 }
 
-void DDSConfig(void)
+void DDSConfig(struct video_timing *video_format)
 {
+	u32 dds_word;
+
+	dds_word = (video_format->pclk_khz / 1000) * 0x16C16;
+	dds_word += ((video_format->pclk_khz % 1000) * 0x16C16 + 500) / 1000;
+
 	I2CADR = 0x92;
-	HDMI_WriteI2C_Byte(0x4e,0x93);//strm_sw_freq_word[ 7: 0]
-	HDMI_WriteI2C_Byte(0x4f,0x3E);//strm_sw_freq_word[15: 8]
-	HDMI_WriteI2C_Byte(0x50,0x29);//strm_sw_freq_word[23:16]
+	HDMI_WriteI2C_Byte(0x4e,(u8)(dds_word & 0xff));//strm_sw_freq_word[ 7: 0]
+	HDMI_WriteI2C_Byte(0x4f,(u8)((dds_word >> 8) & 0xff));//strm_sw_freq_word[15: 8]
+	HDMI_WriteI2C_Byte(0x50,(u8)((dds_word >> 16) & 0xff));//strm_sw_freq_word[23:16]
 	HDMI_WriteI2C_Byte(0x51,0x80);//[0]=strm_sw_freq_word[24]
+	printk("%s DDSConfig pclk=%u kHz word=0x%06x\n",
+	       LOG_FLAG, video_format->pclk_khz, dds_word);
 	HDMI_WriteI2C_Byte(0x1e,0x4f);
 	HDMI_WriteI2C_Byte(0x1f,0x5e);//full_value   464
 	HDMI_WriteI2C_Byte(0x20,0x01);
@@ -231,8 +292,15 @@
 	I2CADR = 0x94;
 	HDMI_WriteI2C_Byte(0x06,0x08);
 	HDMI_WriteI2C_Byte(0x07,0xF0);
-	HDMI_WriteI2C_Byte(0x34,0xD2);//0xE2:32FS; 0xD2:64FS
+	HDMI_WriteI2C_Byte(0x09,0x00);
+	HDMI_WriteI2C_Byte(0x34,0xE2);//0xE2:32FS; 0xD2:64FS
+	HDMI_WriteI2C_Byte(0x35,0x00);//N = 6144(0x1800)
+	HDMI_WriteI2C_Byte(0x36,0x18);
+	HDMI_WriteI2C_Byte(0x37,0x00);
+	HDMI_WriteI2C_Byte(0x3c,0x41);
+	HDMI_WriteI2C_Byte(0x3e,0x0a);
 	HDMI_WriteI2C_Byte(0x0F,0x2B);
+	printk("%s HDMI audio packet setup: 48k N=0x1800\n", LOG_FLAG);
 }
 
 void AudioSpdifEn(void)
@@ -500,11 +568,8 @@
 		if (mipi_det_fail_count < 0xff)
 			mipi_det_fail_count++;
 
-		if (mipi_det_fail_count >= 10 && mipi_relock_count < 5) {
-			mipi_relock_count++;
-			mipi_det_fail_count = 0;
-			LT8912B_MIPI_Relock();
-		}
+		if (mipi_det_fail_count == 10)
+			printk("%s MIPI input invalid, skip auto relock\n", LOG_FLAG);
 	} else {
 		mipi_det_fail_count = 0;
 	}
@@ -525,7 +590,7 @@
 			video_valid = true;
 			printk("%s videoformat = VESA_1280x800_60\n",LOG_FLAG);
 		}	
-		else if(Vsync_H == 0x04 && Vsync_L <= 0xb6&&Vsync_L >= 0x63)//0x4b2
+		else if(Vsync_H == 0x04 && Vsync_L <= 0x67&&Vsync_L >= 0x63)//0x465
 		{
 			video = &video_1920x1080_60Hz;
 			video_valid = true;
@@ -544,9 +609,21 @@
 	  if (video_valid) {
 	      mipi_det_fail_count = 0;
 	      mipi_relock_count = 0;
+	      mipi_video_ready = 1;
+	      DDSConfig(video);
 	      MIPI_Video_Setup(video);
 	      AviInfoframe(video);
 	      MIPIRxLogicRes();
+
+	      #ifdef _hdmi_output
+	      if (LT8912_Get_HPD() && !Tx_HPD) {
+		      msleep(50);
+		      HdmiOutput(1);
+		      Tx_HPD = 1;
+		      printk("%s HDMI output enabled after valid MIPI video\n",
+			     LOG_FLAG);
+	      }
+	      #endif
 	  }
   }
 
@@ -716,7 +793,7 @@
 	HDMIPllAnalog();
 	MipiAnalog();
 	MipiBasicSet();
-	DDSConfig();
+	DDSConfig(&video_1920x1080_60Hz);
 	MIPI_Video_Setup(&video_1920x1080_60Hz);
 	MIPI_Input_det();
 	AudioIIsEn();
@@ -726,7 +803,7 @@
     lt8912_check_dds(); // can be removed when debug stage.
     #endif
 	
-	#ifdef _lvds_bypass
+	#ifdef _lvds_output
 	lvds_output_cfg();
 	LvdsOutput(1);
 	#endif
@@ -737,7 +814,7 @@
 /////////////////////////////////////////////////////////////	
 	
     #ifdef _hdmi_output
-    if(LT8912_Get_HPD()) 
+    if(LT8912_Get_HPD() && mipi_video_ready)
     {
 	   if(!Tx_HPD)
 	   {
@@ -769,7 +846,7 @@
 	      #ifdef _hdmi_output
 		  if(LT8912_Get_HPD()) 
 		  {
-		  	  if(!Tx_HPD)
+		  	  if(mipi_video_ready && !Tx_HPD)
 		  	  {
 	             LT8912B_Suspend(0);
 	             HdmiOutput(1);