There have been reported regressions of the SIL 680 driver when
using MMIO, so this makes it only try MMIO on Cell blades where
it's known to be necessary (the host bridge doesn't do PIO on these).

We'll try to find the root problem with MMIO separately.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

 drivers/ata/pata_sil680.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- linux-work.orig/drivers/ata/pata_sil680.c	2008-03-26 10:43:20.000000000 +1100
+++ linux-work/drivers/ata/pata_sil680.c	2008-03-26 10:43:34.000000000 +1100
@@ -269,7 +269,11 @@ static u8 sil680_init_chip(struct pci_de
 	dev_dbg(&pdev->dev, "sil680: BA5_EN = %d clock = %02X\n",
 		tmpbyte & 1, tmpbyte & 0x30);
 
-	*try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
+	*try_mmio = 0;
+#ifdef CONFIG_PPC
+	if (machine_is(cell))
+		*try_mmio = (tmpbyte & 1) || pci_resource_start(pdev, 5);
+#endif
 
 	switch(tmpbyte & 0x30) {
 		case 0x00:
--
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