1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
index 6f6672c55131..504e1dbfffd7 100644
--- a/drivers/ata/pata_atiixp.c
+++ b/drivers/ata/pata_atiixp.c
@@ -36,15 +36,22 @@ enum {
 static int atiixp_pre_reset(struct ata_port *ap)
 {
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-        static struct pci_bits atiixp_enable_bits[] = {
+        static const struct pci_bits atiixp_enable_bits[] = {
                 { 0x48, 1, 0x01, 0x00 },
                 { 0x48, 1, 0x08, 0x00 }
         };
+        u8 udma;
 
         if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
                 return -ENOENT;
 
-        ap->cbl = ATA_CBL_PATA80;
+        /* Hack from drivers/ide/pci. Really we want to know how to do the
+           raw detection not play follow the bios mode guess */
+        pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ap->port_no, &udma);
+        if ((udma & 0x07) >= 0x04 || (udma & 0x70) >= 0x40)
+                ap->cbl = ATA_CBL_PATA80;
+        else
+                ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }