From patchwork Wed Mar 18 06:35:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Navare, Manasi" X-Patchwork-Id: 11444625 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A37051392 for ; Wed, 18 Mar 2020 06:34:00 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8C58A2076C for ; Wed, 18 Mar 2020 06:34:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8C58A2076C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F1FAF6E866; Wed, 18 Mar 2020 06:33:50 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8FD13898CE; Wed, 18 Mar 2020 06:33:48 +0000 (UTC) IronPort-SDR: /x+BofHbPQ9iKQhIzy+QqIzZXRyxis7OzcrfAN5BrL9FGTavu0O9g5GeLUqUYcfYSKhDmJoieO AqN4HHYBI6nQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2020 23:33:47 -0700 IronPort-SDR: K7+gMKtNA8TaW+AnPejz2F+zk2rlHLF7TssTAc6SFaE5DPArKsGihfoke2y6HdGMDPgSbe02T/ B7hNlJpwVAsg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,566,1574150400"; d="scan'208";a="417839757" Received: from labuser-z97x-ud5h.jf.intel.com ([10.165.21.211]) by orsmga005.jf.intel.com with ESMTP; 17 Mar 2020 23:33:47 -0700 From: Manasi Navare To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 1/3] drm/dp: DRM DP helper for reading Ignore MSA from DPCD Date: Tue, 17 Mar 2020 23:35:15 -0700 Message-Id: <20200318063517.3844-1-manasi.d.navare@intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Manasi Navare , Nicholas Kazlauskas Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" DP sink device sets the Ignore MSA bit in its DP_DOWNSTREAM_PORT_COUNT register to indicate its ability to ignore the MSA video timing paramaters and its ability to support seamless video timing change over a range of timing exposed by DisplayID and EDID. This is required for the sink to indicate that it is Adaptive sync capable. Cc: Jani Nikula Cc: Ville Syrjälä Cc: Harry Wentland Cc: Nicholas Kazlauskas Signed-off-by: Manasi Navare --- include/drm/drm_dp_helper.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index c6119e4c169a..ccd6e2e988b9 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1315,6 +1315,14 @@ drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) DP_ALTERNATE_SCRAMBLER_RESET_CAP; } +/* Ignore MSA timing for Adaptive Sync support on DP 1.4 */ +static inline bool +drm_dp_sink_is_capable_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + return dpcd[DP_DOWN_STREAM_PORT_COUNT] & + DP_MSA_TIMING_PAR_IGNORED; +} + /* * DisplayPort AUX channel */