From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932441Ab2DSVFH (ORCPT ); Thu, 19 Apr 2012 17:05:07 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:41537 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932185Ab2DSVFB (ORCPT ); Thu, 19 Apr 2012 17:05:01 -0400 Message-Id: <20120419210303.480124440@linuxfoundation.org> User-Agent: quilt/0.60-19.1 Date: Thu, 19 Apr 2012 14:03:07 -0700 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, Chris Wilson , Daniel Vetter Subject: [ 04/75] drm/i915/ringbuffer: Exclude last 2 cachlines of ring on 845g In-Reply-To: <20120419210322.GA6478@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chris Wilson commit 27c1cbd06a7620b354cbb363834f3bb8df4f410d upstream. The 845g shares the errata with i830 whereby executing a command within 2 cachelines of the end of the ringbuffer may cause a GPU hang. Signed-off-by: Chris Wilson Signed-off-by: Daniel Vetter Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1057,7 +1057,7 @@ int intel_init_ring_buffer(struct drm_de * of the buffer. */ ring->effective_size = ring->size; - if (IS_I830(ring->dev)) + if (IS_I830(ring->dev) || IS_845G(ring->dev)) ring->effective_size -= 128; return 0;