From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: "Nícolas F. R. A. Prado" <nfraprado@collabora.com>,
"Viresh Kumar" <viresh.kumar@linaro.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
"Matthias Brugger" <matthias.bgg@gmail.com>
Cc: kernel@collabora.com, "Hector.Yuan" <hector.yuan@mediatek.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-pm@vger.kernel.org
Subject: Re: [PATCH v2 2/2] cpufreq: mediatek-hw: Wait for CPU supplies before probing
Date: Wed, 10 Jan 2024 15:31:27 +0100 [thread overview]
Message-ID: <54f3facf-375d-4d23-9003-5ffbda2284dc@collabora.com> (raw)
In-Reply-To: <20240110142305.755367-3-nfraprado@collabora.com>
Il 10/01/24 15:23, Nícolas F. R. A. Prado ha scritto:
> Before proceeding with the probe and enabling frequency scaling for the
> CPUs, make sure that all supplies feeding the CPUs have probed.
>
> This fixes an issue observed on MT8195-Tomato where if the
> mediatek-cpufreq-hw driver enabled the hardware (by writing to
> REG_FREQ_ENABLE) before the SPMI controller driver (spmi-mtk-pmif),
> behind which lies the big CPU supply, probed the platform would hang
> shortly after with "rcu: INFO: rcu_preempt detected stalls on
> CPUs/tasks" being printed in the log.
>
> Fixes: 4855e26bcf4d ("cpufreq: mediatek-hw: Add support for CPUFREQ HW")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
next prev parent reply other threads:[~2024-01-10 14:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-10 14:23 [PATCH v2 0/2] Fixes for hang on MT8195-Tomato during mediatek-cpufreq-hw init Nícolas F. R. A. Prado
2024-01-10 14:23 ` [PATCH v2 1/2] arm64: dts: mediatek: cherry: Describe CPU supplies Nícolas F. R. A. Prado
2024-01-10 14:32 ` AngeloGioacchino Del Regno
2024-02-29 20:23 ` Nícolas F. R. A. Prado
2024-03-01 8:52 ` AngeloGioacchino Del Regno
2024-03-01 14:29 ` Nícolas F. R. A. Prado
2024-01-10 14:23 ` [PATCH v2 2/2] cpufreq: mediatek-hw: Wait for CPU supplies before probing Nícolas F. R. A. Prado
2024-01-10 14:31 ` AngeloGioacchino Del Regno [this message]
2024-01-22 8:38 ` Matthias Brugger
2024-01-23 6:09 ` Viresh Kumar
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