diff --git a/drivers/amlogic/atv_demod/atv_demod_debug.c b/drivers/amlogic/atv_demod/atv_demod_debug.c
index 7e66331b99ee..e00cf71dba2d 100644
--- a/drivers/amlogic/atv_demod/atv_demod_debug.c
+++ b/drivers/amlogic/atv_demod/atv_demod_debug.c
@@ -104,6 +104,7 @@
 	DEBUGFS_CREATE_NODE(atvdemod_isr_en, 0640, dentry, bool)\
 	DEBUGFS_CREATE_NODE(atv_audio_overmodulated_cnt, 0640, dentry, u32)\
 	DEBUGFS_CREATE_NODE(support_secam_l, 0640, dentry, bool)\
+	DEBUGFS_CREATE_NODE(atvdemod_horiz_freq_det_en, 0640, dentry, bool)\
 }
 
 
diff --git a/drivers/amlogic/atv_demod/atv_demod_driver.c b/drivers/amlogic/atv_demod/atv_demod_driver.c
index e56b3608ad05..b7aadef5afe1 100644
--- a/drivers/amlogic/atv_demod/atv_demod_driver.c
+++ b/drivers/amlogic/atv_demod/atv_demod_driver.c
@@ -44,8 +44,10 @@
 #include "atvdemod_func.h"
 #include "atvauddemod_func.h"
 
-
-#define AMLATVDEMOD_VER "V2.14"
+/********************************CODE CHANGE LIST*****************************/
+/* Date --- Version --- Note *************************************************/
+/* 2019/11/05 --- V2.15 --- Add dynamic monitoring line frequency deviation. */
+#define AMLATVDEMOD_VER "V2.15"
 
 struct aml_atvdemod_device *amlatvdemod_devp;
 
diff --git a/drivers/amlogic/atv_demod/atv_demod_monitor.c b/drivers/amlogic/atv_demod/atv_demod_monitor.c
index 4969acb20d8a..5a6e13a8818e 100644
--- a/drivers/amlogic/atv_demod/atv_demod_monitor.c
+++ b/drivers/amlogic/atv_demod/atv_demod_monitor.c
@@ -37,6 +37,7 @@ bool audio_thd_en;
 bool atvdemod_det_nonstd_en;
 bool atvaudio_det_outputmode_en = true;
 bool audio_carrier_offset_det_en;
+bool atvdemod_horiz_freq_det_en = true;
 
 unsigned int atvdemod_timer_delay = 100; /* 1s */
 unsigned int atvdemod_timer_delay2 = 10; /* 100ms */
@@ -87,6 +88,9 @@ static void atv_demod_monitor_do_work(struct work_struct *work)
 
 	if (atvdemod_det_nonstd_en)
 		atv_dmd_non_std_set(true);
+
+	if (atvdemod_horiz_freq_det_en)
+		atvdemod_horiz_freq_detection();
 }
 
 static void atv_demod_monitor_timer_handler(unsigned long arg)
diff --git a/drivers/amlogic/atv_demod/atvdemod_func.c b/drivers/amlogic/atv_demod/atvdemod_func.c
index 56bfd7e8c86e..78e6f8b6dc6f 100644
--- a/drivers/amlogic/atv_demod/atvdemod_func.c
+++ b/drivers/amlogic/atv_demod/atvdemod_func.c
@@ -2545,3 +2545,45 @@ void aml_audio_overmodulation(int enable)
 #endif
 	}
 }
+
+void atvdemod_horiz_freq_detection(void)
+{
+	unsigned long data = 0;
+	int field_lock = 0;
+	int line_lock = 0;
+	int line = 0;
+	int std_line = 0;
+	unsigned long horiz_freq = 0;
+
+	data = atv_dmd_rd_long(APB_BLOCK_ADDR_VDAGC, 0x4c);
+	field_lock = data & 0x4;    /* bit2 */
+	line_lock = data & 0x10;    /* bit4 */
+	line = (data >> 6) & 0x3ff; /* bit[15-6] */
+
+	switch (broad_std) {
+	case AML_ATV_DEMOD_VIDEO_MODE_PROP_NTSC:
+	case AML_ATV_DEMOD_VIDEO_MODE_PROP_PAL_M:
+		std_line = 525;
+		break;
+	default:
+		std_line = 625;
+		break;
+	}
+
+	if (field_lock == 0 && line_lock == 0) {
+		/* bit[31-8] */
+		data = atv_dmd_rd_long(APB_BLOCK_ADDR_VDAGC, 0x10);
+
+		/* fh +/- (200 / 0.23841858) */
+		if ((line - std_line) > 7)
+			horiz_freq = freq_hz_cvrt + 0x347;
+		else if ((line - std_line) < -7)
+			horiz_freq = freq_hz_cvrt - 0x347;
+		else
+			horiz_freq = freq_hz_cvrt;
+
+		data = (horiz_freq << 8) | (data & 0xff);
+
+		atv_dmd_wr_long(APB_BLOCK_ADDR_VDAGC, 0x10, data);
+	}
+}
diff --git a/drivers/amlogic/atv_demod/atvdemod_func.h b/drivers/amlogic/atv_demod/atvdemod_func.h
index 87e73f34b9a1..c8f2f0caaf43 100644
--- a/drivers/amlogic/atv_demod/atvdemod_func.h
+++ b/drivers/amlogic/atv_demod/atvdemod_func.h
@@ -215,6 +215,7 @@ extern void set_atvdemod_scan_mode(int val);
 extern int atvauddemod_init(void);
 extern int amlfmt_aud_standard(int broad_std);
 extern void atvauddemod_set_outputmode(void);
+void atvdemod_horiz_freq_detection(void);
 
 /*from amldemod/amlfrontend.c*/
 extern int vdac_enable_check_dtv(void);