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mvebu: disable cpu idle on WRT1900ACv1

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A regression seriously affecting the Linksys WRT1900ACv1 (Mamba) was
introduced some time between the OpenWrt/LEDE v4.4 and v4.9 kernels.
The root cause has not yet been identified, despite many attempts for
more than a year. Disabling the SoC specific CPU idle support should
mitigate this issue.

The symptoms on an affected system are unwanted reboots at a variable
frequency. In many cases almost immediately after boot, causing a
bootloop.  This effectively disables support for Mamba on OpenWrt
with kernels > v4.4.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2018-03-19 21:58:12 +01:00
parent e062bd8563
commit 5faa9556b1
1 changed files with 10 additions and 0 deletions
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10
target/linux/mvebu/patches-4.14/230-armada-xp-linksys-mamba-broken-idle.patch Normal file
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@ -0,0 +1,10 @@
--- a/arch/arm/boot/dts/armada-xp-linksys-mamba.dts
+++ b/arch/arm/boot/dts/armada-xp-linksys-mamba.dts
@@ -563,3 +563,7 @@
};
};
};
+
+&coherencyfab {
+ broken-idle;
+};