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[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>
This commit is contained in:
James Bottomley 2006-09-06 09:04:40 -05:00 committed by James Bottomley
parent 231839102b
commit 3e3c60e3a8
1 changed files with 12 additions and 4 deletions
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16
drivers/scsi/aic7xxx/aic7xxx_osm.c
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@ -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;
}