From patchwork Fri Sep 25 12:13:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nautiyal, Ankit K" X-Patchwork-Id: 11799625 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 BCCF292C for ; Fri, 25 Sep 2020 12:21:05 +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 7574123600 for ; Fri, 25 Sep 2020 12:21:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7574123600 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 3A5006ECB4; Fri, 25 Sep 2020 12:21:02 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id B506C6ECB4; Fri, 25 Sep 2020 12:21:00 +0000 (UTC) IronPort-SDR: 5d6WB9WtEBXMAuuqCn2gmK1Jsq+VPkfwCQTGqUa8Kq6mxh5bIsQtNBbcN+ktdgl75Et4gWRNdZ pS1gN9YVPyuQ== X-IronPort-AV: E=McAfee;i="6000,8403,9754"; a="149163855" X-IronPort-AV: E=Sophos;i="5.77,301,1596524400"; d="scan'208";a="149163855" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 05:20:59 -0700 IronPort-SDR: Lsm8bWnGAlbWTA7kb2AstTJPcd3vxCL0JQRppMoiWzcPFPbRUIOpAxfHXE0jAih+iA329RWLTR qkg29cbYGmnw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,301,1596524400"; d="scan'208";a="383460341" Received: from unknown (HELO linux-akn.iind.intel.com) ([10.223.34.148]) by orsmga001.jf.intel.com with ESMTP; 25 Sep 2020 05:20:57 -0700 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org Subject: [RFC 0/7] Add support for DP-HDMI2.1 PCON Date: Fri, 25 Sep 2020 17:43:33 +0530 Message-Id: <20200925121340.29497-1-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.17.1 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: vandita.kulkarni@intel.com, uma.shankar@intel.com, dri-devel@lists.freedesktop.org, swati2.sharma@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This patch series attempts to add support for a DP-HDMI2.1 Protocol Convertor. The VESA spec for the HDMI2.1 PCON are proposed in Errata E5 to DisplayPort_v2.0: https://vesa.org/join-vesamemberships/member-downloads/?action=stamp&fileid=42299 The details are mentioned in DP to HDMI2.1 PCON Enum/Config improvement slide decks: https://groups.vesa.org/wg/DP/document/folder/1316 This RFC series starts with adding support for FRL (Fixed Rate Link) Training between the PCON and HDMI2.1 sink. As per HDMI2.1 specification, a new data-channel or lane is added in FRL mode, by repurposing the TMDS clock Channel. Through FRL, higher bit-rate can be supported, ie. up to 12 Gbps/lane (48 Gbps over 4 lanes). With these patches, the HDMI2.1 PCON can be configured to achieve FRL training based on the maximum FRL rate supported by the panel, source and the PCON. The approach is to add the support for FRL training between PCON and HDMI2.1 sink and gradually add other blocks for supporting higher resolutions and other HDMI2.1 features, that can be supported by pcon for the sources that do not natively support HDMI2.1. This is done before the DP Link training between the source and PCON is started. In case of FRL training is not achieved, the PCON will work in the regular TMDS mode, without HDMI2.1 feature support. Any interruption in FRL training between the PCON and HDMI2.1 sink is notified through IRQ_HPD. On receiving the IRQ_HPD the concerned DPCD registers are read and FRL training is re-attempted. Currently, we have tested the FRL training and are able to enable 4K display with TGL Platform + Realtek PCON RTD2173 with HDMI2.1 supporting panel. Ankit Nautiyal (3): drm/dp_helper: Add FRL training support for a DP-HDMI2.1 PCON drm/i915: Add support for starting FRL training for HDMI2.1 via PCON drm/i915: Check for FRL training before DP Link training Swati Sharma (4): drm/edid: Add additional HFVSDB fields for HDMI2.1 drm/edid: Parse MAX_FRL field from HFVSDB block drm/dp_helper: Add support for link status and link recovery drm/i915: Add support for enabling link status and recovery drivers/gpu/drm/drm_dp_helper.c | 338 ++++++++++++++++++ drivers/gpu/drm/drm_edid.c | 50 +++ drivers/gpu/drm/i915/display/intel_ddi.c | 2 + .../drm/i915/display/intel_display_types.h | 6 + drivers/gpu/drm/i915/display/intel_dp.c | 251 ++++++++++++- drivers/gpu/drm/i915/display/intel_dp.h | 2 + include/drm/drm_connector.h | 6 + include/drm/drm_dp_helper.h | 97 +++++ include/drm/drm_edid.h | 30 ++ 9 files changed, 779 insertions(+), 3 deletions(-)