Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752724AbcDUOiv (ORCPT ); Thu, 21 Apr 2016 10:38:51 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:54385 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751485AbcDUOit (ORCPT ); Thu, 21 Apr 2016 10:38:49 -0400 Subject: Re: [PATCH] OMAPDSS: HDMI5: Change DDC timings To: "J.D. Schroeder" , , , , References: <1461196973-20370-1-git-send-email-Linux.HWI@garmin.com> CC: "Lodes, Jim" , "J.D. Schroeder" From: Tomi Valkeinen Message-ID: <5718E5F3.2080504@ti.com> Date: Thu, 21 Apr 2016 17:38:43 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <1461196973-20370-1-git-send-email-Linux.HWI@garmin.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Eemnq6RU76DwXVqwWr1F9JLokd1eFm5JE" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2635 Lines: 68 --Eemnq6RU76DwXVqwWr1F9JLokd1eFm5JE Content-Type: multipart/mixed; boundary="R2xNsBciho4NH0oce1PooBUemmlPBABB9" From: Tomi Valkeinen To: "J.D. Schroeder" , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org, misael.lopez@ti.com Cc: "Lodes, Jim" , "J.D. Schroeder" Message-ID: <5718E5F3.2080504@ti.com> Subject: Re: [PATCH] OMAPDSS: HDMI5: Change DDC timings References: <1461196973-20370-1-git-send-email-Linux.HWI@garmin.com> In-Reply-To: <1461196973-20370-1-git-send-email-Linux.HWI@garmin.com> --R2xNsBciho4NH0oce1PooBUemmlPBABB9 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, On 21/04/16 03:02, J.D. Schroeder wrote: > From: "Lodes, Jim" >=20 > The DDC scl high and low times were set to the minimum values > from the i2c specification, but the i2c specification takes into > account the rise time and fall time to calculate the frequency. > To pass HDMI certification DDC can not exceed 100kHz therefore in > a system where the rise times and fall times are negligible the high > and low times for scl need to be 10us. Thanks, makes sense. Did you measure the rise & fall times? Do you get more or less exactly 100kHz with the new times? > Signed-off-by: Lodes, Jim The email format should be Firstname Lastname Or something similar, but not "Lastname, Firstname" Tomi --R2xNsBciho4NH0oce1PooBUemmlPBABB9-- --Eemnq6RU76DwXVqwWr1F9JLokd1eFm5JE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJXGOXzAAoJEPo9qoy8lh714VoP/jsFpf1R8g3Wrsi5whDVu743 PEvPpJUmUl3ATPhGiRBDMW2QvG1dbcQFA7yGSZkVnyePYln7vAIhCHxdup+d69fj 7tw3iMNQZyyoY4WXbXKTod1re3sP/dp+0Q8K9EcXV3HE6VVxtaQ0U1JZsEVcl59q Wd8v7VKOxk5mPeF4nPnVqUn+XStNG+vnxcNm8v7z0dv+TJjs2iZEGl/KcLadkPe+ Hx6Niw3jptO5599y8Ug8pYMFcLy2Ivid4wr3nl6Z2iLSwLsvRa4/RjGWlXawWOne 5mh94EZoSnqxig4ToNEDDYi9Bcr0h5juCmz0JAVZJbqcrS+xx+4Lb9BsgQcsW9AC iOX+mZKyHU35b/nRUHXrBQoj3NsxAlwB9IsprW/sY6CjrEv6NcwJ22DbVgwYx3I3 RpgrfCNYziV9PqnPh40JnlOepBSAhDEWKX9zs83GtHM+eeuY4Q7/aA46bpkt0yLe q6qd2VnHuQAYd9uvEHovDIxa/6w5AV7JUmPkIEDsgUgkMkeSdO1GTgJNogUzKCw3 A4nqQTeAZu+/wsBGetO4QzXJj7ZeJAvBu1ogKqKtvEMYQhwItk1STz/WKwYAZtv/ 28Z7JBxspikpIvubrXoW2Fj0oWfX8dIeMYB196qUbFtDgJEnqU7iVs9JGgaf3IVz R8zPfqs1nDdknfwtavgM =i65R -----END PGP SIGNATURE----- --Eemnq6RU76DwXVqwWr1F9JLokd1eFm5JE--