diff --git a/drivers/ide/at91_ide.c b/drivers/ide/at91_ide.c
index 6bb45a2b24c2d8f328fede1f1e545aeaa149a215..8fc6ae958b0b0e49ae1e7aaa5e1fc7c06203d50c 100644
--- a/drivers/ide/at91_ide.c
+++ b/drivers/ide/at91_ide.c
@@ -242,7 +242,7 @@ static void at91_ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	ide_mm_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	ide_mm_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = ide_mm_inb(io_ports->feature_addr);
@@ -258,7 +258,7 @@ static void at91_ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = ide_mm_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		ide_mm_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		ide_mm_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature = ide_mm_inb(io_ports->feature_addr);
diff --git a/drivers/ide/ide-h8300.c b/drivers/ide/ide-h8300.c
index ff8339ed59ab0b2afe072904690de895c67dcc7c..7492f28d1290da74f445db3688480253321b1900 100644
--- a/drivers/ide/ide-h8300.c
+++ b/drivers/ide/ide-h8300.c
@@ -98,7 +98,7 @@ static void h8300_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = inb(io_ports->feature_addr);
@@ -114,7 +114,7 @@ static void h8300_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature = inb(io_ports->feature_addr);
diff --git a/drivers/ide/ide-io-std.c b/drivers/ide/ide-io-std.c
index 2d9c6dc3f956faefe93df9742359590498265a84..3a867e49a0affd13358da26967c3e036982487fe 100644
--- a/drivers/ide/ide-io-std.c
+++ b/drivers/ide/ide-io-std.c
@@ -166,7 +166,7 @@ void ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	tf_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = tf_inb(io_ports->feature_addr);
@@ -182,7 +182,7 @@ void ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = tf_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		tf_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature = tf_inb(io_ports->feature_addr);
diff --git a/drivers/ide/ns87415.c b/drivers/ide/ns87415.c
index cbc1d1110385506ce2265689bc90da451cf43ce0..13a9e00efa134c57d4d75f9b6f9fc1900b8ae695 100644
--- a/drivers/ide/ns87415.c
+++ b/drivers/ide/ns87415.c
@@ -74,7 +74,7 @@ static void superio_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = inb(io_ports->feature_addr);
@@ -90,7 +90,7 @@ static void superio_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = superio_ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature = inb(io_ports->feature_addr);
diff --git a/drivers/ide/scc_pata.c b/drivers/ide/scc_pata.c
index 542419ffa9b7082adf41c30b0f933602df2176ba..6e47eac1cd7fd6d5c2b394cae6a35e2fd15190bd 100644
--- a/drivers/ide/scc_pata.c
+++ b/drivers/ide/scc_pata.c
@@ -709,7 +709,7 @@ static void scc_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	scc_ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	scc_ide_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = scc_ide_inb(io_ports->feature_addr);
@@ -725,7 +725,7 @@ static void scc_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = scc_ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		scc_ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		scc_ide_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature = scc_ide_inb(io_ports->feature_addr);
diff --git a/drivers/ide/tx4938ide.c b/drivers/ide/tx4938ide.c
index 657a61890b1caef03d6ae1202fc888a16e624ff7..1c4a78ac1a208e98403005dd67987bcf7f29e6bc 100644
--- a/drivers/ide/tx4938ide.c
+++ b/drivers/ide/tx4938ide.c
@@ -142,7 +142,7 @@ static void tx4938ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	tx4938ide_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = tx4938ide_inb(io_ports->feature_addr);
@@ -158,7 +158,7 @@ static void tx4938ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = tx4938ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		tx4938ide_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature =
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index faf0d97b9ce8eebb14155a00c5d3cb92f3414c6c..77aee5b2ce954050fd64b6d39a3590e2be2336a3 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -509,7 +509,7 @@ static void tx4939ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 	}
 
 	/* be sure we're looking at the low order bits */
-	tx4939ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+	tx4939ide_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE)
 		tf->feature = tx4939ide_inb(io_ports->feature_addr);
@@ -525,7 +525,7 @@ static void tx4939ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 		tf->device = tx4939ide_inb(io_ports->device_addr);
 
 	if (cmd->tf_flags & IDE_TFLAG_LBA48) {
-		tx4939ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+		tx4939ide_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 
 		if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 			tf->hob_feature =