2 files changed, 14 insertions, 2 deletions

diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index f4cd2700cae5..646a54e233d3 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -615,8 +615,7 @@ u8 eighty_ninty_three (ide_drive_t *drive)
         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
                 goto no_80w;
 
-        /* Check for SATA but only if we are ATA5 or higher */
-        if (id->hw_config == 0 && (id->major_rev_num & 0x7FE0))
+        if (ide_dev_is_sata(id))
                 return 1;
 
         /*
diff --git a/include/linux/ide.h b/include/linux/ide.h
index c792b4fd1588..b9f66c10caa0 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1378,6 +1378,19 @@ static inline int ide_dev_has_iordy(struct hd_driveid *id)
         return ((id->field_valid & 2) && (id->capability & 8)) ? 1 : 0;
 }
 
+static inline int ide_dev_is_sata(struct hd_driveid *id)
+{
+        /*
+         * See if word 93 is 0 AND drive is at least ATA-5 compatible
+         * verifying that word 80 by casting it to a signed type --
+         * this trick allows us to filter out the reserved values of
+         * 0x0000 and 0xffff along with the earlier ATA revisions...
+         */
+        if (id->hw_config == 0 && (short)id->major_rev_num >= 0x0020)
+                return 1;
+        return 0;
+}
+
 u8 ide_dump_status(ide_drive_t *, const char *, u8);
 
 typedef struct ide_pio_timings_s {