From mboxrd@z Thu Jan  1 00:00:00 1970
From: Imre Deak <imre.deak@intel.com>
Subject: Re: [PATCH 2/2] drm/i915/bxt: work around HW context
 corruption due to coherency problem
Date: Wed, 16 Sep 2015 15:43:03 +0300
Message-ID: <1442407383.27327.53.camel@intel.com>
References: <1442341820-23531-1-git-send-email-imre.deak@intel.com>
 <1442341820-23531-2-git-send-email-imre.deak@intel.com>
 <20150916081753.GM6442@nuc-i3427.alporthouse.com>
Reply-To: imre.deak@intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mga02.intel.com (mga02.intel.com [134.134.136.20])
 by gabe.freedesktop.org (Postfix) with ESMTP id E278C6E39B
 for <intel-gfx@lists.freedesktop.org>; Wed, 16 Sep 2015 05:43:05 -0700 (PDT)
In-Reply-To: <20150916081753.GM6442@nuc-i3427.alporthouse.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org
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