From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-m49198.qiye.163.com (mail-m49198.qiye.163.com [45.254.49.198]) (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 42B803597D; Wed, 15 Jan 2025 02:05:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.254.49.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736906732; cv=none; b=ey7ZMmjePMJ6gBTQkwnaFxEatyCAMJcnMdEiOw5N8aGcxJ2SCFqYfC2FthxwlgJbL/rsQhryGutZAiiPedqkosMjMwEZmxHitY4ZnK8FwQxkFcuIMv+GG3jsjM1GW1VDc6UgnW5ZbgM6s8M59fiOBG8BW4MY46jgijtNPYPiQjY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736906732; c=relaxed/simple; bh=vRM/t2hsLGe4D6qHL+TIV6mO/HmJX7DIpiioFRM1cKs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=VZiU5no/oLDGkWz+25TBSyjLEDFeU91FmYHMCTks+/5OfmYx9OQEWdJEPtzTMxW1u94SbT4pgzZK9XEReeJIy92vJ23RoOPv95hBANP2nQxS5eiLATyv4fLdTtFqyMQIRG75CnfOXng/ICryjSieHe4H1uZy03RUQX0XQru+EEY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=jmu.edu.cn; spf=pass smtp.mailfrom=jmu.edu.cn; arc=none smtp.client-ip=45.254.49.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=jmu.edu.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=jmu.edu.cn Received: from amadeus-Vostro-3710.lan (unknown [IPV6:240e:3b3:2c00:1f0:6a66:664e:ef87:7f44]) by smtp.qiye.163.com (Hmail) with ESMTP id 8b43c33e; Wed, 15 Jan 2025 10:00:09 +0800 (GMT+08:00) From: Chukun Pan To: jonas@kwiboo.se Cc: amadeus@jmu.edu.cn, conor+dt@kernel.org, devicetree@vger.kernel.org, heiko@sntech.de, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, naoki@radxa.com Subject: Re: [PATCH 1/1] arm64: dts: rockchip: default to host mode for USB on Radxa E25 Date: Wed, 15 Jan 2025 10:00:06 +0800 Message-Id: <20250115020006.10336-1-amadeus@jmu.edu.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWS1ZQUlXWQ8JGhUIEh9ZQVkaTE9CVhpIHh1ISEtDHk9MQ1YeHw5VEwETFhoSFy QUDg9ZV1kYEgtZQVlJT0seQUgZSEFJGEtLQUodS0FNGk1NQU1NTx5BHh1DTEFMHU9PWVdZFhoPEh UdFFlBWU9LSFVKS0hKTkxOVUpLS1VKQktLWQY+ X-HM-Tid: 0a9467b0878c03a2kunm8b43c33e X-HM-MType: 10 X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OE06TRw*LTIcF08sMQoDFz4C LitPCxVVSlVKTEhNQktNT0pLTkNDVTMWGhIXVRoWGh8eDgg7ERYOVR4fDlUYFUVZV1kSC1lBWUlP Sx5BSBlIQUkYS0tBSh1LQU0aTU1BTU1PHkEeHUNMQUwdT09ZV1kIAVlBTEpINwY+ Hi, > I would advise against using any sd-uhs- mode for sd-card on Rockchip > RK356x boards because of a timing issue during boot between mmc, > regulator and IO-domain drivers. This problem seems to occur only on rk356x? > Ideally this race condition should be solved instead of limiting use > of UHS modes. However, use of sd-uhs-sdr50 is typically more forgiving > and has been used on other boards. It seems that sd-uhs-sdr50 does not need 1.8V IO voltage. I tested the speed on a rk3528 board with sdio wifi: (The IO voltage of sdio on this board is 3.3V) highspeed: 170Mbps DL sdr50: 290Mbps DL sdr104: 290Mbps DL So sdr50 should be safe. Thanks, Chukun -- 2.25.1