From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alex Deucher" Subject: Re: radeonfb monid i2c bus Date: Fri, 6 Jun 2008 09:46:39 -0400 Message-ID: References: <20080606120151.7976df45@hyperion.delvare> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1K4cHB-0004zs-7C for linux-fbdev-devel@lists.sourceforge.net; Fri, 06 Jun 2008 06:46:41 -0700 Received: from rv-out-0708.google.com ([209.85.198.243]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1K4cH9-0006mo-UU for linux-fbdev-devel@lists.sourceforge.net; Fri, 06 Jun 2008 06:46:41 -0700 Received: by rv-out-0708.google.com with SMTP id f25so1089169rvb.22 for ; Fri, 06 Jun 2008 06:46:39 -0700 (PDT) In-Reply-To: <20080606120151.7976df45@hyperion.delvare> Content-Disposition: inline List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Jean Delvare Cc: Benjamin Herrenschmidt , linux-fbdev-devel@lists.sourceforge.net On Fri, Jun 6, 2008 at 6:01 AM, Jean Delvare wrote: > Hi Ben, > > Can you explain what is the "monid" i2c bus on Radeon adapters? I have > two Radeon chips here, an M6 in my old laptop and a 9200 in my desktop > system. On the M6 there is nothing on the monid bus. On the 9200, the > monid bus doesn't even work, every access results in timeout. The > radeonfb driver doesn't even look for EDID EEPROMs on that bus (except > in debug code.) > > So I'm curious why you create this i2c bus if you don't need it. > Have you ever seen a Radeon adapter where there is something on that > bus? There are several i2c busses available on radeons and different OEMs use different combinations. The bus used by each display output is listed in the connector table in the vbios rom on x86 cards. Other uses include controlling external TMDS or DAC chips on some cards. This info is also available via the bios tables on x86 cards. Alex ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php