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authorJames Bottomley <James.Bottomley@steeleye.com>2006-09-06 09:04:40 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-09-23 17:39:34 -0500
commit3e3c60e3a8c7013d55768aa7256bb5a7f66b0bb4 (patch)
treefdb4539ec39d15434f74e63e139fb8de3a27e4dc
parent231839102b54512ced7d3ee7fc9b8bcf5e3b583b (diff)
[SCSI] aic7xxx: avoid checking SBLKCTL register for certain cards
For cards that don't support LVD, checking the SBLKCTL register to determine the bus singalling doesn't work. So, check that the card supports LVD first (AHC_ULTRA2) before checking the register. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r--drivers/scsi/aic7xxx/aic7xxx_osm.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index e5bb4d87b30..0b3c01ac425 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2539,15 +2539,23 @@ static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
static void ahc_linux_get_signalling(struct Scsi_Host *shost)
{
struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
- u8 mode = ahc_inb(ahc, SBLKCTL);
+ u8 mode;
- if (mode & ENAB40)
- spi_signalling(shost) = SPI_SIGNAL_LVD;
- else if (mode & ENAB20)
+ if (!(ahc->features & AHC_ULTRA2)) {
+ /* non-LVD chipset, may not have SBLKCTL reg */
spi_signalling(shost) =
ahc->features & AHC_HVD ?
SPI_SIGNAL_HVD :
SPI_SIGNAL_SE;
+ return;
+ }
+
+ mode = ahc_inb(ahc, SBLKCTL);
+
+ if (mode & ENAB40)
+ spi_signalling(shost) = SPI_SIGNAL_LVD;
+ else if (mode & ENAB20)
+ spi_signalling(shost) = SPI_SIGNAL_SE;
else
spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
}