| Message ID | 1301984051-18413-10-git-send-email-benh@kernel.crashing.org (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Commit | 895796a8ab548fe03b6fea410dcb1b86e1913708 |
| Headers | show |
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
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> --- arch/powerpc/kernel/cpu_setup_power7.S | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)