libata-pmp-prep: implement ATA_LFLAG_NO_SRST, ASSUME_ATA and ASSUME_SEMB

Some links on some PMPs locks up on SRST and/or report incorrect
device signature.  Implement ATA_LFLAG_NO_SRST, ASSUME_ATA and
ASSUME_SEMB to handle these quirky links.  NO_SRST makes EH avoid
SRST.  ASSUME_ATA and SEMB forces class code to ATA and SEMB_UNSUP
respectively.  Note that SEMB isn't currently supported yet so the
_UNSUP variant is used.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index f9f81fd93293..6266fffb0eb3 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -165,6 +165,10 @@ enum {
         ATA_LFLAG_HRST_TO_RESUME = (1 << 0), /* hardreset to resume link */
         ATA_LFLAG_SKIP_D2H_BSY  = (1 << 1), /* can't wait for the first D2H
                                              * Register FIS clearing BSY */
+        ATA_LFLAG_NO_SRST       = (1 << 2), /* avoid softreset */
+        ATA_LFLAG_ASSUME_ATA    = (1 << 3), /* assume ATA class */
+        ATA_LFLAG_ASSUME_SEMB   = (1 << 4), /* assume SEMB class */
+        ATA_LFLAG_ASSUME_CLASS  = ATA_LFLAG_ASSUME_ATA | ATA_LFLAG_ASSUME_SEMB,
 
         /* struct ata_port flags */
         ATA_FLAG_SLAVE_POSS     = (1 << 0), /* host supports slave dev */