diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index cf84350..8b24b4f 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -731,6 +731,8 @@
 	
 	if(m5229_revision <= 0x20)
 		tmpbyte = (tmpbyte & (~0x02)) | 0x01;
+	else if (m5229_revision == 0xc7)
+		tmpbyte |= 0x03;
 	else
 		tmpbyte |= 0x01;