Re: [PATCH v3 1/2] arm64: arch_timer: Workaround for Allwinner A64 timer instability

2019-01-14 Thread Marc Zyngier
Hi Samuel, On 13/01/2019 02:17, Samuel Holland wrote: > The Allwinner A64 SoC is known[1] to have an unstable architectural > timer, which manifests itself most obviously in the time jumping forward > a multiple of 95 years[2][3]. This coincides with 2^56 cycles at a > timer frequency of 24 MHz, i

[PATCH v3 1/2] arm64: arch_timer: Workaround for Allwinner A64 timer instability

2019-01-12 Thread Samuel Holland
The Allwinner A64 SoC is known[1] to have an unstable architectural timer, which manifests itself most obviously in the time jumping forward a multiple of 95 years[2][3]. This coincides with 2^56 cycles at a timer frequency of 24 MHz, implying that the time went slightly backward (and this was inte