From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Hilman Subject: Re: exynos5422-odroid-xu3: MCPM: only 6 of 8 CPUs coming online Date: Thu, 23 Oct 2014 11:01:05 -0700 Message-ID: <7h8uk6acny.fsf@deeprootsystems.com> References: <7133556.456161412823997169.JavaMail.weblogic@epml02> <7hzjd4lxc5.fsf@deeprootsystems.com> <54485433.2040008@samsung.com> <54485730.10803@samsung.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from mail-pd0-f173.google.com ([209.85.192.173]:59049 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752865AbaJWSBJ (ORCPT ); Thu, 23 Oct 2014 14:01:09 -0400 Received: by mail-pd0-f173.google.com with SMTP id v10so1445225pde.18 for ; Thu, 23 Oct 2014 11:01:08 -0700 (PDT) In-Reply-To: <54485730.10803@samsung.com> (Joonyoung Shim's message of "Thu, 23 Oct 2014 10:17:36 +0900") Sender: linux-samsung-soc-owner@vger.kernel.org List-Id: linux-samsung-soc@vger.kernel.org To: Joonyoung Shim Cc: "linux-samsung-soc@vger.kernel.org" , a.kesavan@samsung.com, k.chander@samsung.com, mauro.ribeiro@hardkernel.com, abhijeet@abhijeet-dev.net Joonyoung Shim writes: [...] >> One more problem, cpu0 doesn't boot after offline and system is halted. >> >> # echo 0 > /sys/devices/system/cpu/cpu0/online >> [ 28.027852] IRQ152 no longer affine to CPU0 >> [ 28.028087] IRQ256 no longer affine to CPU0 >> [ 28.028344] CPU0: shutdown >> # >> # echo 1 > /sys/devices/system/cpu/cpu0/online >> >> So, it's failed script[1] to test MCPM functionalities >> >> Thanks. >> >> [1]: http://www.spinics.net/lists/arm-kernel/msg330946.html FYI... this hotplug problem happens with or without the patch to bring all 8 CPUs online, so it's not related to that fix. Also, it only happens with the bL switcher enabled, and not with the switcher disabled. Since the bL switcher is built on top of hotplug, I'm not sure if the switcher deals well with CPUs being hotplugged without it knowing. Kevin