Messages in this thread Patch in this message | | | Subject | Re: [PATCH] ARM: exynos_defconfig: Enable big.LITTLE CPUidle support | From | Krzysztof Kozlowski <> | Date | Sat, 29 Aug 2015 18:01:39 +0900 |
| |
W dniu 28.08.2015 o 17:16, Javier Martinez Canillas pisze: > Some Exynos big.LITTLE boards (i.e: Exynos5420 and Exynos5800 based > Chromebooks) have proper firmware that allow the big.LITTLE CPUidle > driver to work correctly, so enable support for this. > > Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> > > --- > Kukjin and Krzysztof, > > As you know there are other boards like the Exynos5422 based Odroid XU{3,4} > whose firmware is broken due leaving CCI in secure mode which means that the > kernel MCPM support can't properly manage CCI. > > So if you pick this patch, it should be tested in kernelci before appearing > in linux-next to prevent any boot issues. > > But if that happens, I believe that is better to do a fix / workaround in > those broken platforms since nothing prevents users to enable this option > anyways. For example the CCI device node could be disabled in the DTS. > > arch/arm/configs/exynos_defconfig | 1 + > 1 file changed, 1 insertion(+)
On Odroid XU3L (next-20150828, Hardkernel u-boot) boot hangs just after:
[ 2.568650] dwmmc_exynos 12200000.mmc: num-slots property not found, assuming 1 slot is available
... so no. NACK :). First the boards, firmware, bootloader or kernel code have to be fixed.
Best regards, Krzysztof
> > diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig > index 729e2fae3e58..228ee945b8ed 100644 > --- a/arch/arm/configs/exynos_defconfig > +++ b/arch/arm/configs/exynos_defconfig > @@ -30,6 +30,7 @@ CONFIG_CPU_FREQ=y > CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y > CONFIG_CPUFREQ_DT=y > CONFIG_CPU_IDLE=y > +CONFIG_ARM_BIG_LITTLE_CPUIDLE=y > CONFIG_ARM_EXYNOS_CPUIDLE=y > CONFIG_VFP=y > CONFIG_NEON=y >
| |