[SCSI] aic79xx, aic7xxx: Fix incorrect width setting

Wide transfers are required for every setting of PPR apart from QAS.
It seems the DV code starts at the minimum, which turns on DT and Wide
regardless of the setting of max_width.  Redo the PPR and period
setting routines to respect max_width (i.e. start at period = 10 if it
is zero).

This fixes bugzilla 8366

Acked-by: "Freels, James D." <freelsjd@ornl.gov>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 21 insertions, 13 deletions

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 286ab83..a055a96 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -2284,9 +2284,12 @@ static void ahd_linux_set_period(struct scsi_target *starget, int period)
 	if (period < 8)
 		period = 8;
 	if (period < 10) {
-		ppr_options |= MSG_EXT_PPR_DT_REQ;
-		if (period == 8)
-			ppr_options |= MSG_EXT_PPR_IU_REQ;
+		if (spi_max_width(starget)) {
+			ppr_options |= MSG_EXT_PPR_DT_REQ;
+			if (period == 8)
+				ppr_options |= MSG_EXT_PPR_IU_REQ;
+		} else
+			period = 10;
 	}
 
 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
@@ -2365,7 +2368,7 @@ static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
 		printf("%s: %s DT\n", ahd_name(ahd), 
 		       dt ? "enabling" : "disabling");
 #endif
-	if (dt) {
+	if (dt && spi_max_width(starget)) {
 		ppr_options |= MSG_EXT_PPR_DT_REQ;
 		if (!width)
 			ahd_linux_set_width(starget, 1);
@@ -2447,7 +2450,7 @@ static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
 		       iu ? "enabling" : "disabling");
 #endif
 
-	if (iu) {
+	if (iu && spi_max_width(starget)) {
 		ppr_options |= MSG_EXT_PPR_IU_REQ;
 		ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
 	}
@@ -2487,7 +2490,7 @@ static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
 		       rdstrm  ? "enabling" : "disabling");
 #endif
 
-	if (rdstrm)
+	if (rdstrm && spi_max_width(starget))
 		ppr_options |= MSG_EXT_PPR_RD_STRM;
 
 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
@@ -2523,7 +2526,7 @@ static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
 		       wrflow ? "enabling" : "disabling");
 #endif
 
-	if (wrflow)
+	if (wrflow && spi_max_width(starget))
 		ppr_options |= MSG_EXT_PPR_WR_FLOW;
 
 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
@@ -2567,7 +2570,7 @@ static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
 		       rti ? "enabling" : "disabling");
 #endif
 
-	if (rti)
+	if (rti && spi_max_width(starget))
 		ppr_options |= MSG_EXT_PPR_RTI;
 
 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
@@ -2603,7 +2606,7 @@ static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
 		       pcomp ? "Enable" : "Disable");
 #endif
 
-	if (pcomp) {
+	if (pcomp && spi_max_width(starget)) {
 		uint8_t precomp;
 
 		if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
@@ -2647,7 +2650,7 @@ static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
 	unsigned long flags;
 
-	if (hold)
+	if (hold && spi_max_width(starget))
 		ppr_options |= MSG_EXT_PPR_HOLD_MCS;
 
 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index 1803ab6..2e9c38f 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2317,8 +2317,13 @@ static void ahc_linux_set_period(struct scsi_target *starget, int period)
 
 	if (period < 9)
 		period = 9;	/* 12.5ns is our minimum */
-	if (period == 9)
-		ppr_options |= MSG_EXT_PPR_DT_REQ;
+	if (period == 9) {
+		if (spi_max_width(starget))
+			ppr_options |= MSG_EXT_PPR_DT_REQ;
+		else
+			/* need wide for DT and need DT for 12.5 ns */
+			period = 10;
+	}
 
 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
 			    starget->channel + 'A', ROLE_INITIATOR);
@@ -2381,7 +2386,7 @@ static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
 	unsigned long flags;
 	struct ahc_syncrate *syncrate;
 
-	if (dt) {
+	if (dt && spi_max_width(starget)) {
 		ppr_options |= MSG_EXT_PPR_DT_REQ;
 		if (!width)
 			ahc_linux_set_width(starget, 1);