From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Antonino A. Daplas" Subject: Re: VESA, EDID & flat panels Date: Tue, 04 Oct 2005 14:56:22 +0800 Message-ID: <43422796.8060505@gmail.com> References: <1128380013.8267.125.camel@gaston> <8a0c36780510031618m48c55f45u648d867bcf0130d2@mail.gmail.com> <1128397436.31063.0.camel@gaston> <434220D0.3020101@gmail.com> <1128407961.31063.50.camel@gaston> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1EMgjI-00047g-K2 for linux-fbdev-devel@lists.sourceforge.net; Mon, 03 Oct 2005 23:56:48 -0700 Received: from xproxy.gmail.com ([66.249.82.202]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1EMgjI-0001Pi-Dy for linux-fbdev-devel@lists.sourceforge.net; Mon, 03 Oct 2005 23:56:48 -0700 Received: by xproxy.gmail.com with SMTP id s7so304039wxc for ; Mon, 03 Oct 2005 23:56:41 -0700 (PDT) In-Reply-To: <1128407961.31063.50.camel@gaston> Sender: linux-fbdev-devel-admin@lists.sourceforge.net Errors-To: linux-fbdev-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: Benjamin Herrenschmidt Cc: linux-fbdev-devel@lists.sourceforge.net Benjamin Herrenschmidt wrote: >> It think it's because the (basic) EDID is retrieved with (basic) DDC >> (address 0x50). If I'm not mistaken, E-EDID is retrieved with E-DDC >> (address 0xa0). I don't exactly know the protocol (E-DDDC specs are not >> freely available), but try probing your i2c busses with: >> >> i2cdump 0,1,2,etc 0xa0 >> >> and see if you get anything. > > Are you sure we aren't talking about the same address here ? Address > 0xa0 _is_ 0x50 shifted one bit left ... (The low bit of an i2c address > is the RW bit). i2cdump takes shifted addresses, thus you can't pass it > anything above 0x7f, thus passing it 0x50 is what gives you address > 0xa0 :) > Yeah, I just realized that :-) Tony ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl