1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index ed79fabe025c..1cb67b221c28 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -33,7 +33,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_sil680"
-#define DRV_VERSION "0.4.1"
+#define DRV_VERSION "0.4.5"
 
 /**
  *      sil680_selreg           -       return register base
@@ -139,10 +139,13 @@ static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
 
         unsigned long tfaddr = sil680_selreg(ap, 0x02);
         unsigned long addr = sil680_seldev(ap, adev, 0x04);
+        unsigned long addr_mask = 0x80 + 4 * ap->port_no;
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
         int pio = adev->pio_mode - XFER_PIO_0;
         int lowest_pio = pio;
+        int port_shift = 4 * adev->devno;
         u16 reg;
+        u8 mode;
 
         struct ata_device *pair = ata_dev_pair(adev);
 
@@ -153,10 +156,17 @@ static void sil680_set_piomode(struct ata_port *ap, struct ata_device *adev)
         pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);
 
         pci_read_config_word(pdev, tfaddr-2, &reg);
+        pci_read_config_byte(pdev, addr_mask, &mode);
+
         reg &= ~0x0200;                 /* Clear IORDY */
-        if (ata_pio_need_iordy(adev))
+        mode &= ~(3 << port_shift);     /* Clear IORDY and DMA bits */
+
+        if (ata_pio_need_iordy(adev)) {
                 reg |= 0x0200;          /* Enable IORDY */
+                mode |= 1 << port_shift;
+        }
         pci_write_config_word(pdev, tfaddr-2, reg);
+        pci_write_config_byte(pdev, addr_mask, mode);
 }
 
 /**