From nobody Fri Dec 19 22:07:36 2025 Received: from sender4-op-o15.zoho.com (sender4-op-o15.zoho.com [136.143.188.15]) (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 9784B24DCF1; Thu, 12 Jun 2025 14:39:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.15 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749739144; cv=pass; b=mIAW3s+92hV1xcbO7/HBuj6UbrzDppjwCGtoqv1B1y4Z0YiEt402fIzxc8+YRelnicmX3kTntR6Q6/kPRYjvBZ+4qK8p4dOC3kp/UMnFcedWNUJ+GxdMKL7DEgKsEwEG/pmrZNkMTOAp1JEKIa8gfM99FJrL/cE2dbcmmyD3riw= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749739144; c=relaxed/simple; bh=7Iba+yAOIxpCZjQ/ocoKHkF9JozbNL0qkGyY/EWGMB8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=B65xYa+0Wq5dlOVdWGf7w8yrEXEoCxeeOq7oXDAYD8Kaj2j3jqyzrPbYiCe/uhDhiitXbXdFcdO6paizZAoFbsE3VC48/uZDUp3S7y4gUpMqlnHXFXQVCvoh1Jl4CqQ3WM/51jWgRZ27xwII5xiYqbb1ME1FjBUlZOGm4xcQiv0= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=icenowy.me; spf=pass smtp.mailfrom=icenowy.me; dkim=pass (2048-bit key) header.d=icenowy.me header.i=uwu@icenowy.me header.b=OVbXLxNE; arc=pass smtp.client-ip=136.143.188.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=icenowy.me Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=icenowy.me Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=icenowy.me header.i=uwu@icenowy.me header.b="OVbXLxNE" ARC-Seal: i=1; a=rsa-sha256; t=1749739130; cv=none; d=zohomail.com; s=zohoarc; b=Hp3G8ROEQbeWJoK7N5HBK3D9jXIWLRscx3PVFjO/g1T2xkWbE/Uewze7ia8LQwVsvvPDN5R/1GuBFqAEXysV9BpNTorzKdotaQ3ESJFfEv3TeQA6M7uSpnxyAXqVdH+kQqWYjQ6tqx5QCvuXp6jooESsuUdQJcGFswtdCCpRDek= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1749739130; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=Ex8oQa+YqEYdb2fSXibJ5RTDwcm8bJDCkvBEZ+deQxs=; b=bPokZiHrisMW+dSeWPXXE+AyO6REJap2XqnG/2zQuQfbQ1Vad5SZtJmKwcvwrgSqV4DL/KWm3+zbxtTnp8XmKGNUcZ6RdeYEcIjrXbTunmQPVta6/6R+CeHFfdyUbVpLO7qqWxgb+MJTA6QwaZaWWJa9J2luaaDdXkWjaqivO/Q= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=icenowy.me; spf=pass smtp.mailfrom=uwu@icenowy.me; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1749739130; s=zmail2; d=icenowy.me; i=uwu@icenowy.me; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:MIME-Version:Content-Transfer-Encoding:Message-Id:Reply-To; bh=Ex8oQa+YqEYdb2fSXibJ5RTDwcm8bJDCkvBEZ+deQxs=; b=OVbXLxNEZRbYJtTuOauDGPtwA5HcpqqIH3N3luJmESXP8XHBYHVSVgn3FRkuvOUt IKydVIUduYnvPc778E5mAUJtxdmuPKKY6LQB4obVF8V4oWGesROyTsl69LGJEB/tI+V 9vK8PqEOL3bunsBO4sTAeOCc611nq/s7XRagjya7ziqqEeWiOSGZy7kssDhYb1gYmR9 /Zkl5TU1ygTdTcY1cPxrCWFh6lrvOQBqcKiHOWULvAd4JE3tbAAeFdwhdDB6g817NI0 ITNbgimg3cVDGIZuuM6qAjfJyquR94QdW/aRVzhcII7aCAvvhylo+F3k3ml5BnDutzp wNpYyHN+3w== Received: by mx.zohomail.com with SMTPS id 1749739128525523.5659147415079; Thu, 12 Jun 2025 07:38:48 -0700 (PDT) From: Icenowy Zheng To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Chen-Yu Tsai Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Icenowy Zheng Subject: [PATCH] arm64: dts: mediatek: mt8173: lower SD clock and disable wp on Elm Date: Thu, 12 Jun 2025 22:38:33 +0800 Message-ID: <20250612143833.2612714-1-uwu@icenowy.me> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External X-ZohoMail-Owner: <20250612143833.2612714-1-uwu@icenowy.me>+zmo_0_ Content-Type: text/plain; charset="utf-8" The microSD slot of Elm seems to have a little signal quality issue and cannot work at 200MHz. In addition, a microSD slot cannot handle write-protection. Lower the clock frequency to 100MHz and add "disable-wp" property to eliminate a note of assuming RW. My Hana device, which is a Lenovo Flex 11 Chromebook, can handle 200MHz; so hana DTSI still have its max SD frequency set to 200MHz. Signed-off-by: Icenowy Zheng --- arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi | 1 + arch/arm64/boot/dts/mediatek/mt8173-elm.dts | 5 +++++ arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi | 1 - 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi b/arch/arm64= /boot/dts/mediatek/mt8173-elm-hana.dtsi index dfc5c2f0ddefd..3147240cfa6ae 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi @@ -68,6 +68,7 @@ trackpad2: trackpad@2c { }; =20 &mmc1 { + max-frequency =3D <200000000>; wp-gpios =3D <&pio 42 GPIO_ACTIVE_HIGH>; }; =20 diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dts b/arch/arm64/boot/= dts/mediatek/mt8173-elm.dts index 2390d04204e83..3385183b60d36 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dts +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dts @@ -13,3 +13,8 @@ / { "google,elm-rev5", "google,elm-rev4", "google,elm-rev3", "google,elm", "mediatek,mt8173"; }; + +&mmc1 { + max-frequency =3D <100000000>; + disable-wp; +}; diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot= /dts/mediatek/mt8173-elm.dtsi index 0d995b342d463..2a253a90bce1b 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi @@ -402,7 +402,6 @@ &mmc1 { pinctrl-0 =3D <&mmc1_pins_default>; pinctrl-1 =3D <&mmc1_pins_uhs>; bus-width =3D <4>; - max-frequency =3D <200000000>; cap-sd-highspeed; sd-uhs-sdr50; sd-uhs-sdr104; --=20 2.49.0