From patchwork Fri Dec 29 21:28:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= X-Patchwork-Id: 758875 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 582D014AA5; Fri, 29 Dec 2023 21:31:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="HPgwDdLK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1703885467; bh=XL6wkiD2HYx6HaI4hGDV0Keb34y3XqC2DjGmqSSBy68=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HPgwDdLKJcKpAtUbU9HxQhIW+JM1CO3SqRQv5YJMD2R4TwrVN+DJJBNTbNklpO7nS Bfklfoae+bCfaUPBoDG9McM1aebFRKxtHozaTaQZ2xjsuoC8tUX2utslWOKSADvf04 X3SsEQVGUlzn4VfGVG6l45wtPcjIY10tTUeqZE1BMjpgEdkp9qbFSx/B+rl2z0vc6r Pc3Z+/REaBuT1b029wtURtyKCBUpAcvbzgfDOiGMi98HAa1J+/5/Kj+5QPvT44UK92 9/ZIkguje/JeQsZ+vuHU81HeqEy4/e9iz0AM/HwPdFOdLMqtxuaV3IA0ALA/L8jQWL Pfsh9wZQX7AdA== Received: from localhost.localdomain (zone.collabora.co.uk [167.235.23.81]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: nfraprado) by madrid.collaboradmins.com (Postfix) with ESMTPSA id E0A023781FDE; Fri, 29 Dec 2023 21:31:02 +0000 (UTC) From: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= To: Viresh Kumar , "Rafael J . Wysocki" Cc: kernel@collabora.com, AngeloGioacchino Del Regno , =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Conor Dooley , Krzysztof Kozlowski , Matthias Brugger , Rob Herring , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org Subject: [PATCH 2/2] arm64: dts: mediatek: cherry: Add CPU supply dependency to cpufreq-hw Date: Fri, 29 Dec 2023 18:28:40 -0300 Message-ID: <20231229212853.277334-2-nfraprado@collabora.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231229212853.277334-1-nfraprado@collabora.com> References: <20231229212853.277334-1-nfraprado@collabora.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When the mediatek-cpufreq-hw driver enables the hardware (by writing to REG_FREQ_ENABLE), if the regulator supplying the voltage to the big CPUs hasn't probed yet, the platform hangs shortly after and "rcu: INFO: rcu_preempt detected stalls on CPUs/tasks" are printed in the log. To prevent this from happening, describe the big CPUs regulator in the performance-controller DT node, so that devlink ensures the regulator has been probed and configured before the frequency scaling hardware is probed and enabled. Signed-off-by: Nícolas F. R. A. Prado --- arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi index dd5b89b73190..505da60eee90 100644 --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi @@ -502,6 +502,10 @@ &pcie1 { pinctrl-0 = <&pcie1_pins_default>; }; +&performance { + big-cpus-supply = <&mt6315_6_vbuck1>; +}; + &pio { mediatek,rsel-resistance-in-si-unit; pinctrl-names = "default";