On Fri, Sep 15, Doug Ledford wrote:
> On Thu, 2006-09-07 at 09:04 -0500, James Bottomley wrote:
> > On Thu, 2006-09-07 at 11:15 +0200, Olaf Hering wrote:
> > > This does not work: ahc_linux_get_signalling: f 56f6
> > >
> > > echo $(( 0x56f6 & 0x00002 )) gives 2, and the ahc_inb is called.
> >
> > Erm, there's something else going on then: An ultra 2 card has to have
> > this register. It's used to signal mode changes in
> > ahc_handle_scsiint(). The piece of code in there will trigger and read
> > this register for any ultra 2 + controller every time there's an error
> > (just to see if the bus mode changed).
>
> Sorry for my belated response, but this usually happens when you access
> an aic chipset too soon after a chip reset. Try putting a delay before
> whatever access is causing this to see if it make s difference. Common
> problems include after a chip reset, touching any register will cause
> the card to reset, etc.
As pointed out in private mail, this patch fixes the machine check for
me. Thanks Doug.
Maybe the AHC_ULTRA2 feature check is needed as well for other cards.
---
drivers/scsi/aic7xxx/aic7xxx_osm.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
Index: linux-2.6.18-rc7/drivers/scsi/aic7xxx/aic7xxx_osm.c
===================================================================
--- linux-2.6.18-rc7.orig/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ linux-2.6.18-rc7/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2539,7 +2539,14 @@ static void ahc_linux_set_iu(struct scsi
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;
+
+ 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;
-
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