From mboxrd@z Thu Jan  1 00:00:00 1970
From: Manasi Navare <manasi.d.navare@intel.com>
Subject: Re: [PATCH] drm/i915/dp: optimize eDP 1.4+ link config
 fast and narrow
Date: Wed, 5 Sep 2018 09:17:35 -0700
Message-ID: <20180905161733.GA1812@intel.com>
References: <20180905095321.13843-1-jani.nikula@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 ESMTPS id 86A1D89745
 for <intel-gfx@lists.freedesktop.org>; Wed,  5 Sep 2018 16:14:46 +0000 (UTC)
Content-Disposition: inline
In-Reply-To: <20180905095321.13843-1-jani.nikula@intel.com>
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: Jani Nikula <jani.nikula@intel.com>
Cc: intel-gfx@lists.freedesktop.org, Rodrigo Vivi <rodrigo.vivi@intel.com>
List-Id: intel-gfx@lists.freedesktop.org
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