From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Hilman Subject: Re: [PATCH v12 0/6] cpufreq: use generic cpufreq drivers for exynos platforms Date: Tue, 25 Nov 2014 11:57:47 -0800 Message-ID: References: <1416576682-5255-1-git-send-email-thomas.ab@samsung.com> <7hioi4l92v.fsf@deeprootsystems.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <7hioi4l92v.fsf@deeprootsystems.com> Sender: linux-samsung-soc-owner@vger.kernel.org To: Thomas Abraham Cc: "linux-pm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Sylwester Nawrocki , "linux-samsung-soc@vger.kernel.org" , Mike Turquette , Kukjin Kim , Tomasz Figa , Lukasz Majewski , Viresh Kumar , =?UTF-8?Q?Heiko_St=C3=BCbner?= , Chanwoo Choi List-Id: linux-pm@vger.kernel.org Hi Thomas, On Mon, Nov 24, 2014 at 10:58 AM, Kevin Hilman wrote: [...] > Second, as with earlier versions of this series, I'm still seeing lots > of "wait_until_divider_stable: timeout in divider stablization" messages > coming out when running powertop. I found a simpler way to reproduce these messages. If I simply use the userspace governor and cycle through all the A7 OPPs, I'll hit this message (script below[1]). Note that I'm also using my DTS change that fixes the vdd_arm and vdd_kfc voltages to a voltage that is high enough for all the OPPs. Kevin [1] #!/bin/sh cpu=cpu4 reg_name=vdd_kfc cpu_reg=$(dirname `find /sys/class/regulator/regulator.*/ -name name -exec grep -l $reg_name {} \;`) echo $cpu_reg # Cycle through frequencies (and check voltage) cd /sys/devices/system/cpu/$cpu/cpufreq echo userspace > scaling_governor for freq in `cat scaling_available_frequencies`; do echo ${freq} > scaling_setspeed echo -n "current freq: " cat scaling_cur_freq echo -n "current voltage: " cat ${cpu_reg}/microvolts sleep 1 done