[libata] sata_sx4, sata_via: minor documentation updates

sata_sx4:
- describe overall driver theory of operation
- add a few constants that will be used in the future

sata_via:
- remove mention of an old-EH function that is going away

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index e8b90e7b42dd..e816965ef4f1 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -303,9 +303,7 @@ static int vt6420_prereset(struct ata_port *ap, unsigned long deadline)
         if (!(ap->pflags & ATA_PFLAG_LOADING))
                 goto skip_scr;
 
-        /* Resume phy.  This is the old resume sequence from
-         * __sata_phy_reset().
-         */
+        /* Resume phy.  This is the old SATA resume sequence */
         svia_scr_write(ap, SCR_CONTROL, 0x300);
         svia_scr_read(ap, SCR_CONTROL); /* flush */