[PATCH] Enable FAST-20 for onboard scsi

[PATCH] Enable FAST-20 for onboard scsi

[Thomas Bogendoerfer]

Both onboard controller of the O2 support FAST-20 transfer speeds,
but the bit, which signals that to the aic driver, isn't set. Instead
of adding detection code to the scsi driver, we just fake the missing
bit in the PCI config space of the scsi chips.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

 arch/mips/pci/ops-mace.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/mips/pci/ops-mace.c b/arch/mips/pci/ops-mace.c
index e958818..1cfb558 100644
--- a/arch/mips/pci/ops-mace.c
+++ b/arch/mips/pci/ops-mace.c
@@ -61,6 +61,13 @@ mace_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 	/* ack possible master abort */
 	mace->pci.error &= ~MACEPCI_ERROR_MASTER_ABORT;
 	mace->pci.control = control;
+	/*
+	 * someone forgot to set the ultra bit for the onboard
+	 * scsi chips; we fake it here
+	 */
+	if (bus->number == 0 && reg == 0x40 && size == 4 &&
+	    (devfn == (1 << 3) || devfn == (2 << 3)))
+		*val |= 0x1000;
 
 	DPRINTK("read%d: reg=%08x,val=%02x\n", size * 8, reg, *val);
 

Re: [PATCH] Enable FAST-20 for onboard scsi

[Ralf Baechle]

On Wed, Jul 02, 2008 at 09:06:03PM +0200, Thomas Bogendoerfer wrote:

> Both onboard controller of the O2 support FAST-20 transfer speeds,
> but the bit, which signals that to the aic driver, isn't set. Instead
> of adding detection code to the scsi driver, we just fake the missing
> bit in the PCI config space of the scsi chips.
> 
> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Thanks, queued for 2.6.27.

  Ralf