Quoting Pali Rohár (2021-01-14 04:40:28)
> When CPU frequency is at 250 MHz and set_rate() is called with 500 MHz (L1)
> quickly followed by a call with 1 GHz (L0), the CPU does not necessarily
> stay in L1 for at least 20ms as is required by Marvell errata.
>
> This situation happens frequently with the ondemand cpufreq governor and
> can be also reproduced with userspace governor. In most cases it causes CPU
> to crash.
>
> This change fixes the above issue and ensures that the CPU always stays in
> L1 for at least 20ms when switching from any state to L0.
>
> Signed-off-by: Marek Behún <ka...@kernel.org>
> Signed-off-by: Pali Rohár <p...@kernel.org>
> Fixes: 61c40f35f5cd ("clk: mvebu: armada-37xx-periph: Fix switching CPU rate
> from 300Mhz to 1.2GHz")
> Cc: sta...@vger.kernel.org
> ---
Acked-by: Stephen Boyd <sb...@kernel.org>
