From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [RFC/PATCH] drm/rockchip: don't wait for vblank if fb hasn't
 changed
Date: Wed, 13 Jan 2016 18:19:17 +0100
Message-ID: <20160113171917.GC19130@phenom.ffwll.local>
References: <1452689614-6570-1-git-send-email-john@metanate.com>
 <20160113142320.GQ19130@phenom.ffwll.local>
 <20160113143425.363ce07a.john@metanate.com>
 <20160113154005.GT19130@phenom.ffwll.local>
 <20160113155529.6048b2c1.john@metanate.com>
 <20160113162156.GA19130@phenom.ffwll.local>
 <20160113164038.5fcf670f.john@metanate.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <dri-devel-bounces@lists.freedesktop.org>
Content-Disposition: inline
In-Reply-To: <20160113164038.5fcf670f.john@metanate.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>
To: John Keeping <john@metanate.com>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org
List-Id: linux-rockchip.vger.kernel.org
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