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path: root/drivers/scsi/aic7xxx/aic7xxx_osm.c
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Diffstat (limited to 'drivers/scsi/aic7xxx/aic7xxx_osm.c')
-rw-r--r--drivers/scsi/aic7xxx/aic7xxx_osm.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index aa4be8a3141..64c8b88a429 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -341,7 +341,7 @@ MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
module_param(aic7xxx, charp, 0444);
MODULE_PARM_DESC(aic7xxx,
-"period delimited, options string.\n"
+"period-delimited options string:\n"
" verbose Enable verbose/diagnostic logging\n"
" allow_memio Allow device registers to be memory mapped\n"
" debug Bitmask of debug values to enable\n"
@@ -2539,15 +2539,28 @@ 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);
+ unsigned long flags;
+ 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;
+ }
+
+ ahc_lock(ahc, &flags);
+ ahc_pause(ahc);
+ mode = ahc_inb(ahc, SBLKCTL);
+ ahc_unpause(ahc);
+ ahc_unlock(ahc, &flags);
+
+ 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;
}