From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: Regression: radeonfb: No synchronisation on CRT with linux-2.6.13-rc5 Date: Sun, 07 Aug 2005 09:51:07 +0200 Message-ID: <1123401069.30257.102.camel@gaston> References: <1123195493.30257.75.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 1E1g0a-0005vL-TS for linux-fbdev-devel@lists.sourceforge.net; Sun, 07 Aug 2005 00:55:48 -0700 Received: from gate.crashing.org ([63.228.1.57]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1E1g0a-00007s-Oy for linux-fbdev-devel@lists.sourceforge.net; Sun, 07 Aug 2005 00:55:49 -0700 In-Reply-To: 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: Bodo Eggert <7eggert@gmx.de> Cc: LKML , linux-fbdev-devel@lists.sourceforge.net On Fri, 2005-08-05 at 19:38 +0200, Bodo Eggert wrote: > On Fri, 5 Aug 2005, Benjamin Herrenschmidt wrote: > > > On Fri, 2005-08-05 at 00:03 +0200, Bodo Eggert wrote: > > > My CRT is out of sync after radeonfb from 2.6.13-rc5 is initialized. > > > 2.6.12 does not show this behaviour. > > > > I'm out of town at the moment, could you maybe diff radeonfb between > > working & non-working and CC me the diff ? I don't have my work stuff at > > hand not my kernel images so... > > There were no changes in radeonfb.c, but I could trace to to > CONFIG_PREEMPT. With _NONE, it works as expected. Ah ! Interesting... I don't see why PREEMPT would affect radeonfb though ... Can you try something like wrapper radeon_write_mode() with preempt_disable()/preempt_enable() and tell me if it makes a difference ? Ben. ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf