On Thu, Nov 2, 2017 at 7:26 PM, Maxime Ripard maxime.ripard@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@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@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@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_SUN8IEven 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:
- Change the frequency in that board config
- 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!