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

[Maxime Ripard]

On Wed, Nov 01, 2017 at 08:31:46AM +0800, Icenowy Zheng wrote:
> 在 2017-10-31 21:54，Maxime Ripard 写道：
> > 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?
> 
> But I think we have already set the default frequency to 816MHz for
> A64, and it seems that several H5 boards are designed to start at 1.1v
> (see the notes by Jagan above).
> 
> > 
> > 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
> 
> NEO2 don't have any voltage adjusting, it's fixed at 1.1V.
> 
> And according to the Orange Pi PC2 and Prime schematics, they both
> start at 1.1V. (The Prime schematics even says "For H5 adjust
> VDD-CPUX to 1.1V).

And what about the Zero Plus 2 ?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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