diff --git a/drivers/ide/cmd64x.c b/drivers/ide/cmd64x.c
index 680e5975217f..ca0c46f6580a 100644
--- a/drivers/ide/cmd64x.c
+++ b/drivers/ide/cmd64x.c
@@ -379,7 +379,8 @@ static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
 		.enablebits	= {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd64x_port_ops,
 		.host_flags	= IDE_HFLAG_CLEAR_SIMPLEX |
-				  IDE_HFLAG_ABUSE_PREFETCH,
+				  IDE_HFLAG_ABUSE_PREFETCH |
+				  IDE_HFLAG_SERIALIZE,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= 0x00, /* no udma */
@@ -389,7 +390,8 @@ static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd648_port_ops,
-		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
+		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH |
+				  IDE_HFLAG_SERIALIZE,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= ATA_UDMA2,
diff --git a/drivers/ide/cs5535.c b/drivers/ide/cs5535.c
index 983d957a0189..b883838adc24 100644
--- a/drivers/ide/cs5535.c
+++ b/drivers/ide/cs5535.c
@@ -187,6 +187,7 @@ static int __devinit cs5535_init_one(struct pci_dev *dev,
 
 static const struct pci_device_id cs5535_pci_tbl[] = {
 	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), 0 },
+	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), },
 	{ 0, },
 };
 
diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c
index d3440b5010a5..6e7ae2b6cfc6 100644
--- a/drivers/ide/ide-ioctls.c
+++ b/drivers/ide/ide-ioctls.c
@@ -162,7 +162,7 @@ static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
 	if (tf->command == ATA_CMD_SET_FEATURES &&
 	    tf->feature == SETFEATURES_XFER &&
 	    tf->nsect >= XFER_SW_DMA_0) {
-		xfer_rate = ide_find_dma_mode(drive, XFER_UDMA_6);
+		xfer_rate = ide_find_dma_mode(drive, tf->nsect);
 		if (xfer_rate != tf->nsect) {
 			err = -EINVAL;
 			goto abort;
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 63c53d65e875..4d76ba473097 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1046,15 +1046,6 @@ static void ide_port_init_devices(ide_hwif_t *hwif)
 		if (port_ops && port_ops->init_dev)
 			port_ops->init_dev(drive);
 	}
-
-	ide_port_for_each_dev(i, drive, hwif) {
-		/*
-		 * default to PIO Mode 0 before we figure out
-		 * the most suited mode for the attached device
-		 */
-		if (port_ops && port_ops->set_pio_mode)
-			port_ops->set_pio_mode(drive, 0);
-	}
 }
 
 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
diff --git a/drivers/ide/slc90e66.c b/drivers/ide/slc90e66.c
index 9aec78d3bcff..1ccfb40e7215 100644
--- a/drivers/ide/slc90e66.c
+++ b/drivers/ide/slc90e66.c
@@ -91,8 +91,7 @@ static void slc90e66_set_dma_mode(ide_drive_t *drive, const u8 speed)
 
 		if (!(reg48 & u_flag))
 			pci_write_config_word(dev, 0x48, reg48|u_flag);
-		/* FIXME: (reg4a & a_speed) ? */
-		if ((reg4a & u_speed) != u_speed) {
+		if ((reg4a & a_speed) != u_speed) {
 			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 			pci_read_config_word(dev, 0x4a, &reg4a);
 			pci_write_config_word(dev, 0x4a, reg4a|u_speed);