From 0f436eff54f90419ac1b8accfb3e6e17c4b49a4e Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Fri, 28 Mar 2008 14:52:29 -0700 Subject: [PATCH] pata_sil680: only enable MMIO on Cell blades 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 Acked-by: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Jeff Garzik --- drivers/ata/pata_sil680.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c index 503245a1ea..3988e44f49 100644 --- a/drivers/ata/pata_sil680.c +++ b/drivers/ata/pata_sil680.c @@ -269,7 +269,11 @@ static u8 sil680_init_chip(struct pci_dev *pdev, int *try_mmio) 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: -- 2.39.5