diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index 0921e8b30a08286411b9426863dffa0bbfafa562..9f5189c700bb00bedbe598e14d7eef47f967c26d 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -316,6 +316,9 @@ static int hpt37x_cable_detect(struct ata_port *ap)
 
 	pci_read_config_byte(pdev, 0x5B, &scr2);
 	pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
+
+	udelay(10); /* debounce */
+
 	/* Cable register now active */
 	pci_read_config_byte(pdev, 0x5A, &ata66);
 	/* Restore state */
diff --git a/drivers/ata/pata_hpt3x2n.c b/drivers/ata/pata_hpt3x2n.c
index 2ab9fd6c597f076580f7309a977bc0b0a1d9594b..8d63eba782ff986e441a503c703612de6db4e1e0 100644
--- a/drivers/ata/pata_hpt3x2n.c
+++ b/drivers/ata/pata_hpt3x2n.c
@@ -128,6 +128,9 @@ static int hpt3x2n_cable_detect(struct ata_port *ap)
 
 	pci_read_config_byte(pdev, 0x5B, &scr2);
 	pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
+
+	udelay(10); /* debounce */
+
 	/* Cable register now active */
 	pci_read_config_byte(pdev, 0x5A, &ata66);
 	/* Restore state */