From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9252C433FE for ; Mon, 3 Oct 2022 17:29:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229514AbiJCR3i (ORCPT ); Mon, 3 Oct 2022 13:29:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229539AbiJCR3Z (ORCPT ); Mon, 3 Oct 2022 13:29:25 -0400 Received: from mail.zeus03.de (www.zeus03.de [194.117.254.33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6798F1B9FA for ; Mon, 3 Oct 2022 10:29:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=sang-engineering.com; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=k1; bh=8s10QBliY2YKx7clxzAsnQl15RY8 ul01qKGWYOlcg3w=; b=q1kxFlAjDeYA12ytoFPJX5Oj/MEsfMWyyS1oOlUmWeqp 8ln0yJ4huHAhpRXdUxRoLd5jKNHNcH2uikqTEESN3Ocdj+y9wN2nCaFuit4vWgZj yUPkjQKiHDXQ2U6LrFR3yzkNkhyIKZbAynRHhTbs+9iW8v7jQuMLnGNSn1rmJEs= Received: (qmail 251076 invoked from network); 3 Oct 2022 19:29:18 +0200 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 3 Oct 2022 19:29:18 +0200 X-UD-Smtp-Session: l3s3148p1@rWfsriTqjKgucrTJ Date: Mon, 3 Oct 2022 19:29:17 +0200 From: Wolfram Sang To: Biju Das Cc: Ulf Hansson , linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad Subject: Re: [PATCH v5] mmc: renesas_sdhi: Fix rounding errors Message-ID: Mail-Followup-To: Wolfram Sang , Biju Das , Ulf Hansson , linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad References: <20220928110755.849275-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="/67QyQbFSIL0lf1y" Content-Disposition: inline In-Reply-To: <20220928110755.849275-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org --/67QyQbFSIL0lf1y Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Sep 28, 2022 at 12:07:55PM +0100, Biju Das wrote: > Due to clk rounding errors on RZ/G2L platforms, it selects a clock source > with a lower clock rate compared to a higher one. > For eg: The rounding error (533333333 Hz / 4 * 4 =3D 533333332 Hz < 53333= 33 > 33 Hz) selects a clk source of 400 MHz instead of 533.333333 MHz. >=20 > This patch fixes this issue by adding a margin of (1/1024) higher to > the clock rate. >=20 > Signed-off-by: Biju Das Can only test on Gen3 currently, but clock settings are the same there. Reviewed-by: Wolfram Sang Tested-by: Wolfram Sang Thanks! --/67QyQbFSIL0lf1y Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmM7G+kACgkQFA3kzBSg KbbDJA//aUxtASX9Zo2yVdoxOzqHJbXUyoby1lEPTir2HV3YXnCIUrwaCmyrgUrY Jrn7zZlmnahYVILy7piMn96rQFiVPt6hZXajj/g4jeMIlRafokvKTvj1KFxtiEoe slOM+1T+aFpjIg0EbBr0k/c0NlPmWR5MgLHEomFFzgN8vex3p4JJnUzb0T5uHf79 gV4u1R3ohW8N0v/nVKhtbGjNnn5aoLyonuyclDQ1I1zpu8uP8/esYAqzj/PLAHdk J/BHhN1iavY4spnHhOObzWKKk3nGljwCUtcUkknqdCYgbOwd6ln7ga4+lNOACIX0 KWOAX+gccpvoz9qVCMinxbEkbkEZxh5GH+wT+u4KDZRlBq+khuh1hEgC2pDGwkMw QNLKXgp87NN0NhLpQpBe26VNCqWh3AWCNnCH3ZHgu8wijox/X5lmsxpX+yYerAnz h46CUyxNYOMCyybgLBlcXRGVe9DKthVNfOjhaXBM0cBe1nEhR6FGNmn/L0ceuVis hx3XdRM65mb7v4IB/2ZtKcB+cfV5bijqGxqdmlxoDedtDqvQYtDBg/xWS2VHvBpD uRbHq4uF17PBl1QcjuKlHnfz1T2A+PpM83e5Jqqe4Q63qCJnLdHDThRVqaBAN50c OEr5GRNMnHsUYAV1ItyrGTj+OMoYOsHHUiesaI2hMncs9P5Gd2E= =gBT4 -----END PGP SIGNATURE----- --/67QyQbFSIL0lf1y--