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 <b...@kernel.crashing.org>
---
arch/powerpc/kernel/cpu_setup_power7.S | 7 +++++++
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 e801ef1..2390f6f 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
--
1.7.1
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