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 E7C8B1C5F13 for ; Tue, 8 Jul 2025 20:29:07 +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=1752006551; cv=none; b=CWK2m79CR0t8fgCf9bIoyuBIja8OZrevw3+gpnRW4RYAOUl/FDP/FhXBEbV5V3oAGcQpX317WZ842NNYLZy+0Ov84yLWvRfNdIacE6sucAkHQn+ciQo3js1Dhw6OeJ7830zcWVG6B2cjSj0ZDQo9CBb6kEILqvsTPZWwm3Po908= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752006551; c=relaxed/simple; bh=HXNekzdlAIvujwir1FcqKXHPqkduAfFMIsqZ5qAjRQg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mDbfxbV69v5vAtbde9hUsujtMb19pIK8lkWKXRLGjev5ggJzVseQNB4EbtMKqtBv47s2iXfGeUzf4dvf0LnBwkEpAbb4VOQYLGFIIjYYSZ74i1shahlPVPQTC3ElBOEV2dfb/EkAQCXC7DWxMrOj9U3qv+S9rh/QhPkGe563y2Y= 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=aZWeELjo; 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="aZWeELjo" 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=HXNe kzdlAIvujwir1FcqKXHPqkduAfFMIsqZ5qAjRQg=; b=aZWeELjov69K+XzSHTeP 7PcNZqiMCwB3+WKHDdXUPgoWpH1DvopjS1aJP3cFuzLTtGlh0Zhm3PN6OhCxG45M rqACPeVJ+myINMEZuonDowyoxvT9aSHmi1kUxAtjH0Jvi9E7zkF6alysdifbizMc q/cmXrqzqOttjK6PQx7sytG7eYw7tqBQ0HUNrp3ctixe39laLG/Q9CibvtfVCwTE 4APp6BFdfeB5C0tLwk0pavXghhuK5uk/rZzyvMNsKV2/HmJK339EH5005HjJO7zo vd7VAauDQHCtmpjpjucKFRQ0aE5UtKP7UiWoEx7Wkq3zzeS6GDA4TQb1IfqO3pjw 7w== Received: (qmail 410506 invoked from network); 8 Jul 2025 22:29:05 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 8 Jul 2025 22:29:05 +0200 X-UD-Smtp-Session: l3s3148p1@Kt/Bz3A5iJcujnuW Date: Tue, 8 Jul 2025 22:29:04 +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 0/2] Enable 64-bit polling mode for R-Car Gen3 and Message-ID: References: <20250630081315.33288-1-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: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="7RtQj/Gv9onJ7SZr" Content-Disposition: inline In-Reply-To: <20250630081315.33288-1-biju.das.jz@bp.renesas.com> --7RtQj/Gv9onJ7SZr Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Mon, Jun 30, 2025 at 09:13:09AM +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. Cool, I had this somewhere on my todo-list as well. I want to test but it will probably be only on Friday. But looking forward to it! --7RtQj/Gv9onJ7SZr Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmhtf5AACgkQFA3kzBSg KbbEvQ//fPDa51V7lt4G1yzObkw/lrxI5VAONfqXRquHogFdULj9ICJMRe0H6IBL Efm4KsX3sc2yWGIzMfNGz8L49jW0mEZeZFDUeBpYg8Pgc64vsGUe5sPaN8lbcgDG QVjUw7tmdwQwSt1uiXXpngcEHXDaCJXw4e04MPqCqOqLLm+5YtQCrFWj0zFmWlAl KaRba3T7bezGj2U9kbXycD98EG6o5WU55xssvZ5f3ubdL7K+8QJyc3EFrxQ54JF7 +p1ukVD5awIBT309ZkYPYWv0SpcpmSZJ8xxxZJ2tCJ4EbKJDMzxTrPF4luh9T/p4 HiTX7kDJvq40xNTnzXHUZMI/IE2+FyS2PuNxKpz4N67Dohc4m4pQv6WhEuW/PCJh MxQYUSz0XapVfwZVygZ1eGgvLC2aBPJskO0TyVkVOiaiysC0dPkaXNZzeHGCCETk gmOPqgm1oX9wavU+W0cZ7ZQdOPK3IzbTchSH52GZeR4Qe0E5uVWx4Jv4xq/NK3fA JZ6PH5DiLeEZeoeG4mRePBuC1ik+WGtiRdCYIr6gc+PJ61zbGGHLwi7+9IBesJ+0 O4g7pNpurl/BTNduuMme2VPHffsRioVeZh6A9Wru4zIFlBJnzb3M822oub4pE04L /jvA8FDxFqLbT3l9+dTaeeJZc61TceoW5ovcW2v53gAE35X1VsQ= =qe92 -----END PGP SIGNATURE----- --7RtQj/Gv9onJ7SZr--