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

[Jagan Teki]

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.

[4] http://linux-sunxi.org/images/f/f6/ORANGE_PI-ZERO-PLUS2_V1_0.pdf

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.