[SCSI] aic79xx: set precompensation

aic79xx has a special 'iocell' chip which handles the precompensation.
If it's set via DV we should make sure to set the chip correctly, too.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 5e13046d845b..e7a32f8e1a5c 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -2636,8 +2636,22 @@ static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
                        pcomp ? "Enable" : "Disable");
 #endif
 
-        if (pcomp)
+        if (pcomp) {
+                uint8_t precomp;
+
+                if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
+                        struct ahd_linux_iocell_opts *iocell_opts;
+
+                        iocell_opts = &aic79xx_iocell_info[ahd->unit];
+                        precomp = iocell_opts->precomp;
+                } else {
+                        precomp = AIC79XX_DEFAULT_PRECOMP;
+                }
                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
+                AHD_SET_PRECOMP(ahd, precomp);
+        } else {
+                AHD_SET_PRECOMP(ahd, 0);
+        }
 
         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
                             starget->channel + 'A', ROLE_INITIATOR);