Re: Odroid U2 Kernel 4.7rc7+ Hang on reboot

[Nicolas Dufresne <nicolas@ndufresne.ca>]

Hi Krzysztof,

I'm leaving for a long vacation (6w) today and didn't find the time to
test your patch. I'd like to thank you for looking into this issue. I
will we able to test this patch at my return.

I do understand now (and with the following mail), that this hardware
have problematic constraints that are specific to the Hardkernel
integration.

regards,
Nicolas

Le mardi 19 juillet 2016 à 13:29 +0200, Krzysztof Kozlowski a écrit :
> On 07/15/2016 05:56 PM, Nicolas Dufresne wrote:
> > Le vendredi 15 juillet 2016 à 16:33 +0200, Tobias Jakobi a écrit :
> > > I can confirm that this indeed doesn't work.
> > > 
> > > chidori ~ # echo 1 > /proc/sys/kernel/sysrq
> > > chidori ~ # echo s > /proc/sysrq-trigger
> > > chidori ~ # echo u > /proc/sysrq-trigger
> > > chidori ~ # echo b > /proc/sysrq-trigger
> > > <board hangs, only red power LED on>
> > > 
> > > I guess Nicolas is seeing a different or another problem here
> > > though.
> > 
> > Well for me both method hangs. On an extra note, reset inside Uboot
> > works, but reboot in Linux hang. I tried adding a trace
> > in syscon_restart_handle(), but the trace is never displayed. I'm
> > wondering if that handler is ever called, or if it's just that the
> > serial console was shut down already.
> > 
> > Any idea what else should I trace ?
> 
> This is weird... reboot should work. Just to confirm it - can you
> test
> following patch in both scenarios (this should fix both of them... at
> least on Odroid U3 but your board might have different SPL/BL1):
> 
> -- >8 --
> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> index 58ad48e7b8f7..7d963d36e96d 100644
> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> @@ -423,7 +423,8 @@
> 
>                         buck2_reg: BUCK2 {
>                                 regulator-name = "vdd_arm";
> -                               regulator-min-microvolt = <900000>;
> +                               //regulator-min-microvolt = <900000>;
> +                               regulator-min-microvolt = <1000000>;
>                                 regulator-max-microvolt = <1350000>;
>                                 regulator-always-on;
>                                 regulator-boot-on;
> 
> 
> 
>