ide: add ide_dev_is_sata() helper (take 2)

Make the SATA drive detection code from eighty_ninty_three() into inline
ide_dev_is_sata() helper fixing it along the way to be more strict while
checking word 80 for the reserved values...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 13 insertions, 0 deletions

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 {