Re: [PATCH mvebu v2 06/10] clk: mvebu: armada-37xx-periph: Fix workaround for switching from L1 to L0
From: Stephen Boyd <sboyd@kernel.org>
Date: 2021-02-10 02:30:29
Also in:
linux-clk, lkml
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 <kabel@kernel.org>
Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 61c40f35f5cd ("clk: mvebu: armada-37xx-periph: Fix switching CPU rate from 300Mhz to 1.2GHz")
Cc: stable@vger.kernel.org
---Acked-by: Stephen Boyd <sboyd@kernel.org> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel