From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755026AbZIFNaY (ORCPT ); Sun, 6 Sep 2009 09:30:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754966AbZIFNaU (ORCPT ); Sun, 6 Sep 2009 09:30:20 -0400 Received: from 82-117-125-11.tcdsl.calypso.net ([82.117.125.11]:51698 "EHLO smtp.ossman.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754858AbZIFNaT (ORCPT ); Sun, 6 Sep 2009 09:30:19 -0400 Date: Sun, 6 Sep 2009 15:30:18 +0200 From: Pierre Ossman To: Tobias Diedrich Cc: SDHCI development , linux-kernel@vger.kernel.org Subject: Re: QUIRK_FORCE_HISPD (was: Re: Ricoh R5C822 and QUIRK_FORCE_DMA) Message-ID: <20090906153018.6c03d942@mjolnir.ossman.eu> In-Reply-To: <20090801051716.GA28791@yamamaya.is-a-geek.org> References: <20090430224524.GA9487@yamamaya.is-a-geek.org> <20090513195956.30f78012@mjolnir.ossman.eu> <20090609224145.GA11001@yamamaya.is-a-geek.org> <20090613125322.750a1180@mjolnir.ossman.eu> <20090801051716.GA28791@yamamaya.is-a-geek.org> X-Mailer: Claws Mail 3.7.2 (GTK+ 2.16.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; protocol="application/pgp-signature"; boundary="=_freyr.ossman.eu-24517-1252243821-0001-2" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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-24517-1252243821-0001-2 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Sat, 1 Aug 2009 07:17:16 +0200 Tobias Diedrich wrote: > Pierre Ossman wrote: > > > On a related note, I had a little time to play a bit more with my > > > R5C822 and found that I can also force-enable HISPD mode, which > > > boost performance further. > > >=20 > >=20 > > This seems odd. What frequency is the controller reporting? > >=20 > > It could be that they originally wanted the controller to be > > high-speed, but that they had stability problems and turned it off. > > There is at least one other controller that went through that scenario. >=20 > I assume thats host->max_clk? > The controller seems to report 33MHz for that value. >=20 Ah, then your controller is most likely not really high-speed. You're getting a bit more performance as you are forcing things out-of-spec and you're lucky enough that it still happens to work. :) Rgds --=20 -- Pierre Ossman WARNING: This correspondence is being monitored by the Swedish government. Make sure your server uses encryption for SMTP traffic and consider using PGP for end-to-end encryption. --=_freyr.ossman.eu-24517-1252243821-0001-2 Content-Type: application/pgp-signature; name="signature.asc" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (GNU/Linux) iEYEARECAAYFAkqjuWwACgkQ7b8eESbyJLhnEwCgtHMbnq32l/087v+7EPBRbjgP G6oAn12qYlI1lgObKy6SVXftsJROc04Y =6l9K -----END PGP SIGNATURE----- --=_freyr.ossman.eu-24517-1252243821-0001-2--