From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Clifton Subject: Re: [PATCH 1/4] drm/i915: Configure the TV sense state correctly on GM45 to make TV detection reliable Date: Wed, 21 Apr 2010 20:59:08 +0100 Message-ID: <1271879948.3617.1.camel@pcjc2lap> References: <1270631482-30282-1-git-send-email-zhenyuw@linux.intel.com> <1270631482-30282-2-git-send-email-zhenyuw@linux.intel.com> <87hbnkqqey.fsf@pollan.anholt.net> <1271839581.3515.3.camel@localhost.localdomain> <1271862548.32382.17242.camel@atropine.boston.devel.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from ppsw-43.csi.cam.ac.uk (ppsw-43.csi.cam.ac.uk [131.111.8.143]) by gabe.freedesktop.org (Postfix) with ESMTP id 11AD19E73F for ; Wed, 21 Apr 2010 13:22:30 -0700 (PDT) In-Reply-To: <1271862548.32382.17242.camel@atropine.boston.devel.redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org To: Adam Jackson Cc: "intel-gfx@lists.freedesktop.org" , Stable Team List-Id: intel-gfx@lists.freedesktop.org On Wed, 2010-04-21 at 11:09 -0400, Adam Jackson wrote: > But I really don't see how, short of a really really bad hardware bug, > turning a subsystem _off_ would make that subsystem work. Not knowing how the HW works, I'm only guessing.. but the Intel driver is using a polling based method to detect TV-out, not the state-change interrupt based method. It is (just) possible that the state-change detection logic is separate to that used for polling the status, and the two are conflicting. Some hardware guys at Intel will probably have to confirm this. -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)