Kevin Hilman <khilman@xxxxxxxxxx> writes: > Hi Thomas, > > Thomas Abraham <thomas.ab@xxxxxxxxxxx> writes: > >> Changes since v11: >> - Rebased on top of git://linuxtv.org/snawrocki/samsung.git for-v3.19-exynos-clk > > Thanks for rebasing/reposting. > >> This patch series removes the use of Exynos4210 and Exynos5250 specific cpufreq >> drivers and enables the use of cpufreq-dt driver for these platforms. This >> series also enables cpufreq support for Exynos5420 using arm_big_little cpufreq >> driver. >> >> This series is based on the following branch. >> git://linuxtv.org/snawrocki/samsung.git for-v3.19-exynos-clk >> >> This series depends on the following patch which can be picked from >> git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git samsung/dt >> e540920cf21c (ARM: dts: add CPU nodes for Exynos4 SoCs). >> >> This patch series has been tested on Exynos4210/5250/5420 based boards. >> Tomasz Figa had plans to take this in the Samsung clock tree for v3.19 >> (http://www.spinics.net/lists/linux-samsung-soc/msg37933.html). >> Sylwester, could you consider to merge this in your tree? > > I tested this on exynos5800-peach-pi, and noticed a few things. > > First, since voltage scaling is not currently supported, the CPU cluster > regulators (vdd_arm, and vdd_kfc) have to be set at sufficietnly high > voltage to support all the OPPs, otherwise things will likely hang. I > think you should include something like the patch below[1] in this > series as well. > > 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. And, I just found another issue: On exynos5800-peach-pi, setting the cpufreq default governor to performance at compile time (CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y) makes the kernel boot hang when the cpufreq driver is initialized. However, setting the compile-time default to the userspace governor, and then setting the performance governor via sysfs after the boot finishes seems to work fine. Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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