From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756009Ab2AXCmn (ORCPT ); Mon, 23 Jan 2012 21:42:43 -0500 Received: from cantor2.suse.de ([195.135.220.15]:49963 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755814Ab2AXCmj (ORCPT ); Mon, 23 Jan 2012 21:42:39 -0500 X-Mailbox-Line: From gregkh@clark.kroah.org Mon Jan 23 18:39:25 2012 Message-Id: <20120124023925.531004452@clark.kroah.org> User-Agent: quilt/0.50-11.1 Date: Mon, 23 Jan 2012 18:33:58 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Alex Deucher , Dave Airlie Subject: [018/129] drm/radeon/kms: disable writeback on pre-R300 asics In-Reply-To: <20120124024041.GA18422@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ Content-Length: 1126 Lines: 34 From: Alex Deucher commit 28eebb703e28bc455ba704adb1026f76649b768c upstream. We often end up missing fences on older asics with writeback enabled which leads to delays in the userspace accel code, so just disable it by default on those asics. Reported-by: Helge Deller Reported-by: Dave Airlie Signed-off-by: Alex Deucher Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/radeon_device.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -224,8 +224,11 @@ int radeon_wb_init(struct radeon_device if (radeon_no_wb == 1) rdev->wb.enabled = false; else { - /* often unreliable on AGP */ if (rdev->flags & RADEON_IS_AGP) { + /* often unreliable on AGP */ + rdev->wb.enabled = false; + } else if (rdev->family < CHIP_R300) { + /* often unreliable on pre-r300 */ rdev->wb.enabled = false; } else { rdev->wb.enabled = true;