From patchwork Tue Jul 9 14:05:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Imre Deak X-Patchwork-Id: 2825299 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id B9D4D9F7D6 for ; Tue, 9 Jul 2013 14:06:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8354120181 for ; Tue, 9 Jul 2013 14:06:06 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 596AC2013D for ; Tue, 9 Jul 2013 14:06:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3099BE5CD0 for ; Tue, 9 Jul 2013 07:06:05 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga14.intel.com (mga14.intel.com [143.182.124.37]) by gabe.freedesktop.org (Postfix) with ESMTP id 96127E625C for ; Tue, 9 Jul 2013 07:05:28 -0700 (PDT) Received: from azsmga002.ch.intel.com ([10.2.17.35]) by azsmga102.ch.intel.com with ESMTP; 09 Jul 2013 07:05:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="4.87,1028,1363158000"; d="scan'208"; a="265895838" Received: from intelbox.fi.intel.com (HELO localhost) ([10.237.72.70]) by AZSMGA002.ch.intel.com with ESMTP; 09 Jul 2013 07:05:27 -0700 From: Imre Deak To: intel-gfx@lists.freedesktop.org Date: Tue, 9 Jul 2013 17:05:26 +0300 Message-Id: <1373378726-18437-1-git-send-email-imre.deak@intel.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1373374062.7984.17.camel@intelbox> References: <1373374062.7984.17.camel@intelbox> Subject: [Intel-gfx] [PATCH v2] drm/i915: fix lane bandwidth capping for DP 1.2 sinks X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP DP 1.2 compatible displays may report a 5.4Gbps maximum bandwidth which the driver will treat as an invalid value and use 1.62Gbps instead. Fix this by capping to 2.7Gbps for sinks reporting a 5.4Gbps max bw. Also add a warning for reserved values. v2: - allow only bw values explicitly listed in the DP standard (Daniel, Chris) Signed-off-by: Imre Deak --- drivers/gpu/drm/i915/intel_dp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 11eb697..7db2cd7 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -75,7 +75,12 @@ intel_dp_max_link_bw(struct intel_dp *intel_dp) case DP_LINK_BW_1_62: case DP_LINK_BW_2_7: break; + case DP_LINK_BW_5_4: /* 1.2 capable displays may advertise higher bw */ + max_link_bw = DP_LINK_BW_2_7; + break; default: + WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n", + max_link_bw); max_link_bw = DP_LINK_BW_1_62; break; }