From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.zeus03.de (zeus03.de [194.117.254.33]) (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 AD7CD2853E5 for ; Tue, 22 Jul 2025 19:26:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=194.117.254.33 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753212399; cv=none; b=LCmY9Lym5idGYtDg5iVpoebTZbb+TL/IarO2s9yeXLF1BqN4glLWqDD2FLmmX5WnGn0Q8VqSk8yW3kA2rCpaWYTRj+lYb8JwneiS0O8QUQKLbhZ4RlqsIDVgfMr28jN4g/oXXuUzVkNLemsyRpHP5jsHv1nikiLvY7ljZxBT14A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753212399; c=relaxed/simple; bh=mzSoIsEKCwpH21W7Py+zSJvqzc3qFVqilRY8dGbc6Vk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=EMxFXKBkQloRvg/pTH+gd4sbHPatGSip1OZ5Y2nGTAkfz5IMmeyPruEX1uNhaFhXTrsWgMMrCzYtvQHN8cAwudpjKamH9Ncfh9Rwl28Bu/N6Oi1EmaCeyTci96nheDSoFDS6G2sZ4tQDl/l8QxwA6CAkZcjvnOMs9FIw1plwWFQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com; spf=pass smtp.mailfrom=sang-engineering.com; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b=geTbU4dT; arc=none smtp.client-ip=194.117.254.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b="geTbU4dT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to; s=k1; bh=r0se VXBzF/UCWTab8iJ+6lvymXg4AvFvgAxbeeeU86g=; b=geTbU4dT4f68eCT1s3Xg UAtlpbyUwx5/XC66rzgaunRLiBOuY7IOmhQHpRjuVfC0K6w1y8ONrkHtjhvQDmR6 n3kzGMXQaQnbL56mZARXvHhAbiv/Ku7ihz81fwkEmEhmedST7stJUO+ntsjdUkCu /ARR3xJjSOeN5u7LVi9UnHf4LAGDdNNJOCtJfAiT2VFlHrU11Hb5tSY/7vNgoK7F 3alohpgR6Nk2qRJgi9Ikn6/rQzfwHcg9clVVIarBj9fqiC/02KW7w3P3rbhTdfdK 9ohG+Yw9BtXTZg+nW57g8ruXv3Qwo4WTs2rTzsQn2IXPT8ZAuJKNsiMy/oT/SY6H nQ== Received: (qmail 1431530 invoked from network); 22 Jul 2025 21:26:34 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 22 Jul 2025 21:26:34 +0200 X-UD-Smtp-Session: l3s3148p1@lMf5kYk6zM4gAwDPXyBWAATEinPyanBm Date: Tue, 22 Jul 2025 21:26:34 +0200 From: Wolfram Sang To: Biju Das Cc: Ulf Hansson , linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Geert Uytterhoeven , Prabhakar Mahadev Lad , Biju Das Subject: Re: [PATCH RFC/RFT 1/2] mmc: tmio: Add 64-bit read/write support for SD_BUF0 in polling mode Message-ID: References: <20250630081315.33288-1-biju.das.jz@bp.renesas.com> <20250630081315.33288-2-biju.das.jz@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250630081315.33288-2-biju.das.jz@bp.renesas.com> On Mon, Jun 30, 2025 at 09:13:10AM +0100, Biju Das wrote: > As per the RZ/{G2L,G3E} HW manual SD_BUF0 can be accessed by 16/32/64 > bits. Most of the data transfer in SD/SDIO/eMMC mode is more than 8 bytes. > During testing it is found that, if the DMA buffer is not aligned to 128 > bit it fallback to PIO mode. In such cases, 64-bit access is much more > efficient than the current 16-bit. > > Signed-off-by: Biju Das Tested-by: Wolfram Sang