From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6D0653D75B9 for ; Mon, 13 Apr 2026 14:07:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776089265; cv=none; b=gpRxK5VQam3et0n0frJnyKlArusoab5L0UvMGFK9TF29OAyuD8DMQavRpm8QQBaWtfWehu2GUKwsxd+gBQ4Czu+F8CSkwoVTvIWQ/6qfHivWPKkJK5QCPE0EeJW1Vv8rtEKDo3S+uIVuCpGkhEoYxZlj1mm0DQqaA9ZmVrQzCig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776089265; c=relaxed/simple; bh=rYlkBKBsB8WxTCNMTLHmzmAl61Aa25uaMAlVm59kdFU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZBEXKuR6LplQSHw042T++zcD2evzK0npZNNUltqE9F1r2wL6qy3uzEmebcmE0G53LDEfaGHVxuZ2M3saounXs8Op8LAe1QEpeJ4qBht0oIF8nBrJloRFkv8HSWpCPnVMeujUPFUCSfI68p1A3OhvzNeKdY8FwM5bEy1nMCCCRUs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DVc67MPM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DVc67MPM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 780A6C2BCB4; Mon, 13 Apr 2026 14:07:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776089265; bh=rYlkBKBsB8WxTCNMTLHmzmAl61Aa25uaMAlVm59kdFU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DVc67MPMhNWhb6Xzc61T5g6Ae6m4jATB/4HfY3PakQeBEnHtHBQ4JGczbyc4Hwy33 mcIA95KGnlQrJGqhf3DOAccU46GVC8s0vmSsYvCP1Px5ywpxsMPzxVS56U6UZ+leJI u/FGrtEnMfuhXAIF/RAepzZYfIzT+y5Lk1EWhzb6jMDT6oaJSXXVt2HQVM7cMIJsJc m1x1gLU20E1VVXtDlDi/Hv7vKyU/z/X4oK951yffpvsnap+55++nwAVR5eT9SuRCy5 vFSK8u0gDfn3bjobKK2NrQbQyhp+9hYBN9fX4LH0j4tvgMcKUOvvKHn4rQ00gpEYGq 4/r+BxiuoobdQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Sebastian Krzyszkowiak , Martin Kepplinger , Shawn Guo , Sasha Levin Subject: [PATCH 6.1.y 1/4] arm64: dts: imx8mq-librem5: Set the DVS voltages lower Date: Mon, 13 Apr 2026 10:07:39 -0400 Message-ID: <20260413140742.2903986-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026041309-reheat-frenzy-98e8@gregkh> References: <2026041309-reheat-frenzy-98e8@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Sebastian Krzyszkowiak [ Upstream commit c24a9b698fb02cd0723fa8375abab07f94b97b10 ] They're still in the operating range according to i.MX 8M Quad datasheet. There's some headroom added over minimal values to account for voltage drop. Operational ranges (min - typ - max [selected]): - VDD_SOC (BUCK1): 0.81 - 0.9 - 0.99 [0.88] - VDD_ARM (BUCK2): 0.81 - 0.9 - 1.05 [0.84] (1000MHz) 0.90 - 1.0 - 1.05 [0.93] (1500MHz) - VDD_GPU (BUCK3): 0.81 - 0.9 - 1.05 [0.85] (800MHz) 0.90 - 1.0 - 1.05 [ -- ] (1000MHz) - VDD_VPU (BUCK4): 0.81 - 0.9 - 1.05 [ -- ] (550/500/588MHz) 0.90 - 1.0 - 1.05 [0.93] (660/600/800MHz) Idle power consumption doesn't appear to be influenced much, but a simple load test (`cat /dev/urandom | pigz - > /dev/null` combined with running Animatch) seems to show about 0.3W of difference. Care is advised, as there may be differences between each units in how low can they be undervolted - in my experience, reaching that point usually makes the phone fail to boot. In my case, it appears that my Birch phone can go down the most. This is a somewhat conservative set of values that I've seen working well on all my devices; I haven't tried very hard to optimize it, so more experiments are welcome. Signed-off-by: Sebastian Krzyszkowiak Signed-off-by: Martin Kepplinger Signed-off-by: Shawn Guo Stable-dep-of: 511f76bf1dce ("arm64: dts: imx8mq-librem5: Bump BUCK1 suspend voltage up to 0.85V") Signed-off-by: Sasha Levin --- .../boot/dts/freescale/imx8mq-librem5-r3.dts | 2 +- .../boot/dts/freescale/imx8mq-librem5.dtsi | 22 ++++++++++++++----- 2 files changed, 17 insertions(+), 7 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts index 4533a84fb0b95..077c5cd2586f7 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts @@ -7,7 +7,7 @@ &a53_opp_table { opp-1000000000 { - opp-microvolt = <1000000>; + opp-microvolt = <950000>; }; }; diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi index 1499d5d8bbc04..855f8f7cb4e79 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi @@ -819,8 +819,8 @@ buck1_reg: BUCK1 { regulator-max-microvolt = <1300000>; regulator-boot-on; regulator-ramp-delay = <1250>; - rohm,dvs-run-voltage = <900000>; - rohm,dvs-idle-voltage = <850000>; + rohm,dvs-run-voltage = <880000>; + rohm,dvs-idle-voltage = <820000>; rohm,dvs-suspend-voltage = <800000>; regulator-always-on; }; @@ -831,8 +831,8 @@ buck2_reg: BUCK2 { regulator-max-microvolt = <1300000>; regulator-boot-on; regulator-ramp-delay = <1250>; - rohm,dvs-run-voltage = <1000000>; - rohm,dvs-idle-voltage = <900000>; + rohm,dvs-run-voltage = <950000>; + rohm,dvs-idle-voltage = <850000>; regulator-always-on; }; @@ -841,14 +841,14 @@ buck3_reg: BUCK3 { regulator-min-microvolt = <700000>; regulator-max-microvolt = <1300000>; regulator-boot-on; - rohm,dvs-run-voltage = <900000>; + rohm,dvs-run-voltage = <850000>; }; buck4_reg: BUCK4 { regulator-name = "buck4"; regulator-min-microvolt = <700000>; regulator-max-microvolt = <1300000>; - rohm,dvs-run-voltage = <1000000>; + rohm,dvs-run-voltage = <930000>; }; buck5_reg: BUCK5 { @@ -1379,3 +1379,13 @@ &wdog1 { fsl,ext-reset-output; status = "okay"; }; + +&a53_opp_table { + opp-1000000000 { + opp-microvolt = <850000>; + }; + + opp-1500000000 { + opp-microvolt = <950000>; + }; +}; -- 2.53.0