From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Subject: Re: [PATCH 2/2] drm/i915: Flush the RING stop bit after
 clearing RING_HEAD in reset
Date: Fri, 18 May 2018 11:02:04 +0100
Message-ID: <180a51c4-d94f-d989-4c30-4f1e99d581b1@linux.intel.com>
References: <20180517142442.16979-1-chris@chris-wilson.co.uk>
 <20180517142442.16979-2-chris@chris-wilson.co.uk>
 <74bbb686-71d7-39cf-7ccc-d1ef15ec59f2@linux.intel.com>
 <152663684782.4210.173099292201688911@mail.alporthouse.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mga14.intel.com (mga14.intel.com [192.55.52.115])
 by gabe.freedesktop.org (Postfix) with ESMTPS id 6394A6ECD8
 for <intel-gfx@lists.freedesktop.org>; Fri, 18 May 2018 10:02:08 +0000 (UTC)
In-Reply-To: <152663684782.4210.173099292201688911@mail.alporthouse.com>
Content-Language: en-GB
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://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: <https://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>, intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org
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