From mboxrd@z Thu Jan  1 00:00:00 1970
From: Damien Lespiau <damien.lespiau@intel.com>
Subject: Re: [PATCH] drm/i915: RMW register cycles considered
	evil
Date: Mon, 6 Jul 2015 13:46:19 +0100
Message-ID: <20150706124619.GD19207@strange.amr.corp.intel.com>
References: <1436186522-7834-1-git-send-email-daniel.vetter@ffwll.ch>
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 mga01.intel.com (mga01.intel.com [192.55.52.88])
 by gabe.freedesktop.org (Postfix) with ESMTP id 8DE826E44F
 for <intel-gfx@lists.freedesktop.org>; Mon,  6 Jul 2015 05:46:21 -0700 (PDT)
Content-Disposition: inline
In-Reply-To: <1436186522-7834-1-git-send-email-daniel.vetter@ffwll.ch>
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: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Daniel Vetter <daniel.vetter@intel.com>, Intel Graphics Development <intel-gfx@lists.freedesktop.org>
List-Id: intel-gfx@lists.freedesktop.org
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=