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References: <20210114124032.12765-1-pali@kernel.org> <20210114124032.12765-6-pali@kernel.org>
Subject: Re: [PATCH mvebu v2 05/10] clk: mvebu: armada-37xx-periph: Fix switching CPU freq from 250 Mhz to 1 GHz
From:   Stephen Boyd <sboyd@kernel.org>
Cc:     Marek =?utf-8?q?Beh=C3=BAn?= <kabel@kernel.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Tomasz Maciej Nowak <tmn505@gmail.com>,
        Luka Perkov <luka.perkov@sartura.hr>,
        Andre Heider <a.heider@gmail.com>,
        Vladimir Vid <vladimir.vid@sartura.hr>,
        Russell King <rmk+kernel@armlinux.org.uk>,
        =?utf-8?q?G=C3=A9rald?= Kerma <gerald@gk2.net>,
        Konstantin Porotchkin <kostap@marvell.com>
To:     Andrew Lunn <andrew@lunn.ch>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Pali =?utf-8?q?Roh=C3=A1r?= <pali@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org,
        linux-kernel@vger.kernel.org
Date:   Tue, 09 Feb 2021 17:58:24 -0800
Message-ID: <161292230417.418021.9609462768507058743@swboyd.mtv.corp.google.com>
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Quoting Pali Roh=C3=A1r (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.
>=20
> When base CPU frequency is just 800 MHz no crashed were observed during
> switch from L2 to L0.
>=20
> Signed-off-by: Pali Roh=C3=A1r <pali@kernel.org>
> Fixes: 2089dc33ea0e ("clk: mvebu: armada-37xx-periph: add DVFS support fo=
r cpu clocks")
> Cc: stable@vger.kernel.org # 61c40f35f5cd ("clk: mvebu: armada-37xx-perip=
h: Fix switching CPU rate from 300Mhz to 1.2GHz")
> ---

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