From 4628d7cada7a19166ba8fe57f5ef0f0009694e1e Mon Sep 17 00:00:00 2001 From: Mark Maule Date: Mon, 25 Apr 2005 13:18:02 -0700 Subject: [IA64-SGI] disable TIOCA GART TLB prefetching Patch to disable SGI TIOCA GART TLB prefetching due to hw bug. Signed-off-by: Mark Maule Signed-off-by: Tony Luck diff --git a/arch/ia64/sn/pci/tioca_provider.c b/arch/ia64/sn/pci/tioca_provider.c index 2234d61..54a0dd4 100644 --- a/arch/ia64/sn/pci/tioca_provider.c +++ b/arch/ia64/sn/pci/tioca_provider.c @@ -171,15 +171,15 @@ tioca_gart_init(struct tioca_kernel *tioca_kern) * use agp op-combining * use GET semantics to fetch memory * participate in coherency domain - * prefetch TLB entries + * DISABLE GART PREFETCHING due to hw bug tracked in SGI PV930029 */ ca_base->ca_control1 |= CA_AGPDMA_OP_ENB_COMBDELAY; /* PV895469 ? */ ca_base->ca_control2 &= ~(CA_GART_MEM_PARAM); ca_base->ca_control2 |= (0x2ull << CA_GART_MEM_PARAM_SHFT); tioca_kern->ca_gart_iscoherent = 1; - ca_base->ca_control2 |= - (CA_GART_WR_PREFETCH_ENB | CA_GART_RD_PREFETCH_ENB); + ca_base->ca_control2 &= + ~(CA_GART_WR_PREFETCH_ENB | CA_GART_RD_PREFETCH_ENB); /* * Unmask GART fetch error interrupts. Clear residual errors first. -- cgit v0.10.2