Hello, Several people (including me) have experienced extremely large system clock jumps on their A64-based devices, apparently due to the architectural timer going backward, which is interpreted by Linux as the timer wrapping around after 2^56 cycles.
Investigation led to discovery of some obvious problems with this SoC's architectural timer, and this patch series introduces what I believe is the simplest workaround. More details are in the commit message for patch 1. Patch 2 simply enables the workaround in the device tree. Thanks, Samuel Samuel Holland (2): arm64: arch_timer: Workaround for Allwinner A64 timer instability arm64: dts: allwinner: a64: Enable A64 timer workaround arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 1 + drivers/clocksource/Kconfig | 11 ++++++++ drivers/clocksource/arm_arch_timer.c | 39 +++++++++++++++++++++++++++ 3 files changed, 51 insertions(+) -- 2.16.1
