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

[Maxime Ripard]

On Fri, Nov 03, 2017 at 02:21:51PM +0530, Jagan Teki wrote:
> On Thu, Nov 2, 2017 at 7:26 PM, Maxime Ripard
> <maxime.ripard at free-electrons.com> wrote:
> > 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 ?
> 
> Same equation with same reg values, but missing reg names on specific
> register area Page 7 [4] but hope both were same.

Ok, so it's not some H5 boards, it's all of them. It makes sense then,
once the commit log has been changed.

Maxime

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