Re: Odroid U2 Kernel 4.7rc7+ Hang on reboot

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

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;