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: Zhenyu Wang <[email protected]> Signed-off-by: Chris Wilson <[email protected]>
syzer · Nov 2, 2010 · 897ef19 · 897ef19
1 parent d110852
commit 897ef19
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
@@ -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;