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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-01-24 13:25:55 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-20 11:03:23 +1000
commit895796a8ab548fe03b6fea410dcb1b86e1913708 (patch)
treed25d7c5c284386d21c1f16162d0cfd52fbc154e8 /arch
parent673b189a2e3353061fa8c49515d1014dab6ad9b9 (diff)
downloadlinaro-lsk-895796a8ab548fe03b6fea410dcb1b86e1913708.tar.gz
powerpc: Initialize LPCR:DPFD on power7 to a sane default
This sets the default data stream prefetch size for operating systems that don't set their own value in DSCR. We use 4 which is "medium". Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/cpu_setup_power7.S7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_power7.S b/arch/powerpc/kernel/cpu_setup_power7.S
index e801ef15d6d..2390f6f7c47 100644
--- a/arch/powerpc/kernel/cpu_setup_power7.S
+++ b/arch/powerpc/kernel/cpu_setup_power7.S
@@ -54,6 +54,7 @@ __init_LPCR:
*
* LPES = 0b01 (HSRR0/1 used for 0x500)
* PECE = 0b111
+ * DPFD = 4
*
* Other bits untouched for now
*/
@@ -61,6 +62,12 @@ __init_LPCR:
ori r3,r3,(LPCR_LPES0|LPCR_LPES1)
xori r3,r3, LPCR_LPES0
ori r3,r3,(LPCR_PECE0|LPCR_PECE1|LPCR_PECE2)
+ li r5,7
+ sldi r5,r5,LPCR_DPFD_SH
+ andc r3,r3,r5
+ li r5,4
+ sldi r5,r5,LPCR_DPFD_SH
+ or r3,r3,r5
mtspr SPRN_LPCR,r3
isync
blr