Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751949Ab0ABMIS (ORCPT ); Sat, 2 Jan 2010 07:08:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751488Ab0ABMIR (ORCPT ); Sat, 2 Jan 2010 07:08:17 -0500 Received: from 82-117-125-11.tcdsl.calypso.net ([82.117.125.11]:51927 "EHLO smtp.ossman.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751311Ab0ABMIQ (ORCPT ); Sat, 2 Jan 2010 07:08:16 -0500 Date: Sat, 2 Jan 2010 13:08:09 +0100 From: Pierre Ossman To: Ben Nizette Cc: Hein_Tibosch , Sascha Hauer , Adrian Hunter , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Matt Fleming Subject: Re: [PATCH v2] mmc: lower init clock frequency to 300kHz Message-ID: <20100102130809.121b7e10@mjolnir.ossman.eu> In-Reply-To: <49985427-DCB9-40E1-815B-43C812B41DE3@niasdigital.com> References: <1246492196.2980.17.camel@linux-51e8.site> <20090702135849.21370282@hskinnemoen-d830> <1246537056.2980.60.camel@linux-51e8.site> <4B3E570C.2060602@yahoo.es> <63809451-ED1D-487A-AE63-F72B23D136D8@niasdigital.com> <4B3F019F.6010306@yahoo.es> <49985427-DCB9-40E1-815B-43C812B41DE3@niasdigital.com> X-Mailer: Claws Mail 3.7.3 (GTK+ 2.18.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; protocol="application/pgp-signature"; boundary="=_freyr.ossman.eu-26580-1262434098-0001-2" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1921 Lines: 53 This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_freyr.ossman.eu-26580-1262434098-0001-2 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Sat, 2 Jan 2010 20:07:01 +1100 Ben Nizette wrote: >=20 > Pierre, thoughts? All my cards were borderline spec but Hein's got a mai= nstream, common card which seems to completely ignore the spec. Can we jus= t take the few-hundred-uS hit and allow initialization down at the bottom e= nd, say 100kHz? >=20 Broken cards seem to be all over the spectrum, so I wouldn't be suprised if you find ones that break if you go too low as well. Basically you'll just have to try something and watch the bug reports. Perhaps doing the bisect approach and choosing the intermediate value each time? I.e. halvway between 400 and 100 for now (250). If that is too fast, then halway between that and 100 (175), and so on. Rgds --=20 -- Pierre Ossman WARNING: This correspondence is being monitored by FRA, a Swedish intelligence agency. Make sure your server uses encryption for SMTP traffic and consider using PGP for end-to-end encryption. --=_freyr.ossman.eu-26580-1262434098-0001-2 Content-Type: application/pgp-signature; name="signature.asc" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (GNU/Linux) iEYEARECAAYFAks/Ny0ACgkQ7b8eESbyJLhkWwCdEW8fCGvxdmCgG3bWao/5VMRz s/IAnjRKKidbbCZlt0MAGg+cAuH/K7Ee =QdN+ -----END PGP SIGNATURE----- --=_freyr.ossman.eu-26580-1262434098-0001-2-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/