From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp05.au.ibm.com", Issuer "GeoTrust SSL CA" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id B24B5B6FF6 for ; Tue, 5 Apr 2011 16:14:21 +1000 (EST) Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [202.81.31.247]) by e23smtp05.au.ibm.com (8.14.4/8.13.1) with ESMTP id p3568Z7U004442 for ; Tue, 5 Apr 2011 16:08:35 +1000 Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p356ELs22109536 for ; Tue, 5 Apr 2011 16:14:21 +1000 Received: from d23av03.au.ibm.com (loopback [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p356EKPr011084 for ; Tue, 5 Apr 2011 16:14:20 +1000 From: Benjamin Herrenschmidt To: linuxppc-dev@ozlabs.org Subject: [PATCH 09/15] powerpc: Initialize LPCR:DPFD on power7 to a sane default Date: Tue, 5 Apr 2011 16:14:05 +1000 Message-Id: <1301984051-18413-10-git-send-email-benh@kernel.crashing.org> In-Reply-To: <1301984051-18413-1-git-send-email-benh@kernel.crashing.org> References: <1301984051-18413-1-git-send-email-benh@kernel.crashing.org> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 --- 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