On Tue, Oct 31, 2017 at 04:05:36PM +0800, icen...@aosc.io wrote: > 在 2017-10-31 15:57，Jagan Teki 写道： > > On Tue, Oct 31, 2017 at 5:06 AM, Icenowy Zheng <icen...@aosc.io> wrote: > > > Some H5 boards are designed to start at 1.1V CPUx voltage (e.g. Nano > > > Pi > > > NEO2), which may not work properly at 1008MHz if the chip's quality is > > > not so good. > > > > > > Lower the default CPUx frequency of H5 to 816MHz. > > > > > > Signed-off-by: Icenowy Zheng <icen...@aosc.io> > > > --- > > > arch/arm/mach-sunxi/Kconfig | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig > > > index 09cfec6f57..1fededd0a3 100644 > > > --- a/arch/arm/mach-sunxi/Kconfig > > > +++ b/arch/arm/mach-sunxi/Kconfig > > > @@ -397,9 +397,9 @@ config SYS_CLK_FREQ > > > default 1008000000 if MACH_SUN5I > > > default 1008000000 if MACH_SUN6I > > > default 912000000 if MACH_SUN7I > > > + default 816000000 if MACH_SUN50I || MACH_SUN50I_H5 > > > default 1008000000 if MACH_SUN8I > > > > Even orangepi pc2 has 1.1v after power-on and it's work fine [1] did > > you find an issue with neo2?
So you have one single model that fails, and you change the default frequency of all the boards using that SoC? It seems a bit overkill. I guess we have two solutions: 1) Change the frequency in that board config 2) Change the voltage in that board config There's no need to enforce a SoC-wide change. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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