From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752295Ab2GZM3H (ORCPT ); Thu, 26 Jul 2012 08:29:07 -0400 Received: from co1ehsobe005.messaging.microsoft.com ([216.32.180.188]:39762 "EHLO co1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751266Ab2GZM27 (ORCPT ); Thu, 26 Jul 2012 08:28:59 -0400 X-Forefront-Antispam-Report: CIP:163.181.249.108;KIP:(null);UIP:(null);IPV:NLI;H:ausb3twp01.amd.com;RD:none;EFVD:NLI X-SpamScore: 0 X-BigFish: VPS0(zzzz1202hzz8275bhz2dh668h839hd24he5bhf0ah107ah) X-WSS-ID: 0M7RPC5-01-D1A-02 X-M-MSG: From: Andre Przywara To: , "Rafael J. Wysocki" CC: Matthew Garrett , Andreas Herrmann , Thomas Renninger , , , Andre Przywara Subject: [PATCH 2/8] acpi-cpufreq: Add quirk to disable _PSD usage on all AMD CPUs Date: Thu, 26 Jul 2012 14:28:38 +0200 Message-ID: <1343305724-2809-3-git-send-email-andre.przywara@amd.com> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1343305724-2809-1-git-send-email-andre.przywara@amd.com> References: <1343305724-2809-1-git-send-email-andre.przywara@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: amd.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To workaround some Windows specific behavior, the ACPI _PSD table on AMD desktop boards advertises all cores as dependent, meaning that they all can only use the same P-state. acpi-cpufreq strictly obeys this description, instantiating one CPU only and symlinking the others. But the hardware can have distinct frequencies for each core and powernow-k8 did it that way. So, in order to use the hardware to its full potential and keep the original powernow-k8 behavior, lets override the _PSD table setting on AMD hardware. We use the siblings table, as it matches the current hardware behavior. Signed-off-by: Andre Przywara --- drivers/cpufreq/acpi-cpufreq.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 067a61f..ea949b8 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -586,6 +586,14 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; cpumask_copy(policy->cpus, cpu_core_mask(cpu)); } + + if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) { + cpumask_clear(policy->cpus); + cpumask_set_cpu(cpu, policy->cpus); + cpumask_copy(policy->related_cpus, cpu_sibling_mask(cpu)); + policy->shared_type = CPUFREQ_SHARED_TYPE_HW; + pr_info_once("overriding _PSD data for CPU %d\n", cpu); + } #endif /* capability check */ -- 1.7.4.4