[U-Boot] [PATCH] sunxi: set the default CPUx frequency of H5 to 816MHz

[Maxime Ripard]

On Tue, Oct 31, 2017 at 04:05:36PM +0800, icenowy at aosc.io wrote:
> 在 2017-10-31 15:57，Jagan Teki 写道：
> > On Tue, Oct 31, 2017 at 5:06 AM, Icenowy Zheng <icenowy at 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 <icenowy at 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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