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Commit 897ef192 authored by Zhenyu Wang's avatar Zhenyu Wang Committed by Chris Wilson
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agp/intel: restore cache behavior on sandybridge 



This restores cache behavior for default AGP_USER_MEMORY as
uncached, and leave default AGP_USER_CACHED_MEMORY as LLC only.
I've seen different cache behavior on one sandybridge desktop CPU vs.
another mobile CPU. Until we figure out how to detect the real cache
config, restore back to the original behavior now.

Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent d1108525

drivers/char/agp/intel-gtt.c

+1 −1
Original line number Diff line number Diff line
@@ -1288,7 +1288,7 @@ static void gen6_write_entry(dma_addr_t addr, unsigned int entry, 
	unsigned int gfdt = flags & AGP_USER_CACHED_MEMORY_GFDT;

	u32 pte_flags;



	if (type_mask == AGP_USER_UNCACHED_MEMORY)

	if (type_mask == AGP_USER_MEMORY)

		pte_flags = GEN6_PTE_UNCACHED | I810_PTE_VALID;

	else if (type_mask == AGP_USER_CACHED_MEMORY_LLC_MLC) {

		pte_flags = GEN6_PTE_LLC_MLC | I810_PTE_VALID;