diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c
index 64b33774cbdf..782a696ac587 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-debug.c
@@ -9,9 +9,61 @@
  */
 
 #include <linux/debugfs.h>
+#include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/pm_runtime.h>
+#include <linux/seq_file.h>
 
 #include "rkisp1-common.h"
+#include "rkisp1-regs.h"
+
+#define RKISP1_DEBUG_DATA_COUNT_BINS	32
+#define RKISP1_DEBUG_DATA_COUNT_STEP	(4096 / RKISP1_DEBUG_DATA_COUNT_BINS)
+
+static int rkisp1_debug_input_status_show(struct seq_file *m, void *p)
+{
+	struct rkisp1_device *rkisp1 = m->private;
+	u16 data_count[RKISP1_DEBUG_DATA_COUNT_BINS] = { };
+	unsigned int hsync_count = 0;
+	unsigned int vsync_count = 0;
+	unsigned int i;
+	u32 data;
+	u32 val;
+	int ret;
+
+	ret = pm_runtime_get_if_in_use(rkisp1->dev);
+	if (ret <= 0)
+		return ret ? : -ENODATA;
+
+	/* Sample the ISP input port status 10000 times with a 1µs interval. */
+	for (i = 0; i < 10000; ++i) {
+		val = rkisp1_read(rkisp1, RKISP1_CIF_ISP_FLAGS_SHD);
+
+		data = (val & RKISP1_CIF_ISP_FLAGS_SHD_S_DATA_MASK)
+		     >> RKISP1_CIF_ISP_FLAGS_SHD_S_DATA_SHIFT;
+		data_count[data / RKISP1_DEBUG_DATA_COUNT_STEP]++;
+
+		if (val & RKISP1_CIF_ISP_FLAGS_SHD_S_HSYNC)
+			hsync_count++;
+		if (val & RKISP1_CIF_ISP_FLAGS_SHD_S_VSYNC)
+			vsync_count++;
+
+		udelay(1);
+	}
+
+	pm_runtime_put(rkisp1->dev);
+
+	seq_printf(m, "vsync: %u, hsync: %u\n", vsync_count, hsync_count);
+	seq_puts(m, "data:\n");
+	for (i = 0; i < ARRAY_SIZE(data_count); ++i)
+		seq_printf(m, "- [%04u:%04u]: %u\n",
+			   i * RKISP1_DEBUG_DATA_COUNT_STEP,
+			   (i + 1) * RKISP1_DEBUG_DATA_COUNT_STEP - 1,
+			   data_count[i]);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(rkisp1_debug_input_status);
 
 void rkisp1_debug_init(struct rkisp1_device *rkisp1)
 {
@@ -42,6 +94,8 @@ void rkisp1_debug_init(struct rkisp1_device *rkisp1)
 			     &debug->frame_drop[RKISP1_MAINPATH]);
 	debugfs_create_ulong("sp_frame_drop", 0444, debug->debugfs_dir,
 			     &debug->frame_drop[RKISP1_SELFPATH]);
+	debugfs_create_file("input_status", 0444, debug->debugfs_dir, rkisp1,
+			    &rkisp1_debug_input_status_fops);
 }
 
 void rkisp1_debug_cleanup(struct rkisp1_device *rkisp1)
diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h b/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h
index 7045f4a5a5d5..dd3e6c38be67 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-regs.h
@@ -443,6 +443,15 @@
 #define RKISP1_CIF_ISP_DEMOSAIC_BYPASS			BIT(10)
 #define RKISP1_CIF_ISP_DEMOSAIC_TH(x)			((x) & 0xFF)
 
+/* ISP_FLAGS_SHD */
+#define RKISP1_CIF_ISP_FLAGS_SHD_ISP_ENABLE_SHD		BIT(0)
+#define RKISP1_CIF_ISP_FLAGS_SHD_ISP_ENABLE_INFORM_SHD	BIT(1)
+#define RKISP1_CIF_ISP_FLAGS_SHD_INFORM_FIELD		BIT(2)
+#define RKISP1_CIF_ISP_FLAGS_SHD_S_DATA_MASK		GENMASK(27, 16)
+#define RKISP1_CIF_ISP_FLAGS_SHD_S_DATA_SHIFT		16
+#define RKISP1_CIF_ISP_FLAGS_SHD_S_VSYNC		BIT(30)
+#define RKISP1_CIF_ISP_FLAGS_SHD_S_HSYNC		BIT(31)
+
 /* AWB */
 /* ISP_AWB_PROP */
 #define RKISP1_CIF_ISP_AWB_YMAX_CMP_EN			BIT(2)