linux-kernel - [PATCH v2 0/2] Fixes for hang on MT8195-Tomato during mediatek-cpufreq-hw init

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Date: Wed, 10 Jan 2024 11:23:00 -0300
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Matthias Brugger <matthias.bgg@...il.com>
Cc: kernel@...labora.com,
	Nícolas F. R. A. Prado <nfraprado@...labora.com>,
	Conor Dooley <conor+dt@...nel.org>,
	"Hector.Yuan" <hector.yuan@...iatek.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-pm@...r.kernel.org
Subject: [PATCH v2 0/2] Fixes for hang on MT8195-Tomato during mediatek-cpufreq-hw init


These two patches fix 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.

Changes in v2:
- Moved supply phandles to CPU nodes in DT
- Added fixes tags
- Added patch to verify CPU supplies are available before proceeding in
  the mediatek-cpufreq-hw driver

Nícolas F. R. A. Prado (2):
  arm64: dts: mediatek: cherry: Describe CPU supplies
  cpufreq: mediatek-hw: Wait for CPU supplies before probing

 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 32 +++++++++++++++++++
 drivers/cpufreq/mediatek-cpufreq-hw.c         | 19 ++++++++++-
 2 files changed, 50 insertions(+), 1 deletion(-)

-- 
2.43.0