linux-kernel - Re: [PATCH mvebu v2 05/10] clk: mvebu: armada-37xx-periph: Fix switching CPU freq from 250 Mhz to 1 GHz

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Date:   Tue, 09 Feb 2021 17:58:24 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Michael Turquette <mturquette@...libre.com>,
        Pali Rohár <pali@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Marek Behún <kabel@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Andre Heider <a.heider@...il.com>,
        Vladimir Vid <vladimir.vid@...tura.hr>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Gérald Kerma <gerald@....net>,
        Konstantin Porotchkin <kostap@...vell.com>
Subject: Re: [PATCH mvebu v2 05/10] clk: mvebu: armada-37xx-periph: Fix switching CPU freq from 250 Mhz to 1 GHz

Quoting Pali Rohár (2021-01-14 04:40:27)
> It was observed that the workaround introduced by commit 61c40f35f5cd
> ("clk: mvebu: armada-37xx-periph: Fix switching CPU rate from 300Mhz to
> 1.2GHz") when base CPU frequency is 1.2 GHz is also required when base
> CPU frequency is 1 GHz. Otherwise switching CPU frequency directly from
> L2 (250 MHz) to L0 (1 GHz) causes a crash.
> 
> When base CPU frequency is just 800 MHz no crashed were observed during
> switch from L2 to L0.
> 
> Signed-off-by: Pali Rohár <pali@...nel.org>
> Fixes: 2089dc33ea0e ("clk: mvebu: armada-37xx-periph: add DVFS support for cpu clocks")
> Cc: stable@...r.kernel.org # 61c40f35f5cd ("clk: mvebu: armada-37xx-periph: Fix switching CPU rate from 300Mhz to 1.2GHz")
> ---

Acked-by: Stephen Boyd <sboyd@...nel.org>