1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index 8e88efc565be..469952366ed4 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -270,6 +270,16 @@ struct ata_taskfile {
 
 #define ata_id_cdb_intr(id)     (((id)[0] & 0x60) == 0x20)
 
+static inline unsigned int ata_id_major_version(const u16 *id)
+{
+        unsigned int mver;
+
+        for (mver = 14; mver >= 1; mver--)
+                if (id[ATA_ID_MAJOR_VER] & (1 << mver))
+                        break;
+        return mver;
+}
+
 static inline int ata_id_current_chs_valid(const u16 *id)
 {
         /* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command