From patchwork Fri Jun 5 14:14:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 224806 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6826EC433E0 for ; Fri, 5 Jun 2020 14:16:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47AB420E65 for ; Fri, 5 Jun 2020 14:16:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591366612; bh=5ytxPpxU0m3lHoVVGX4RTX2V48UhxcGD1rEGh/T19/c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=a2EfRZPklEdlWlcU0Fp7YvF2gi+RRGr92E5xeBwo+W8hA5sLRR04wfrBHQa3OZaeJ B5YI9+i467BwRdO9wEo9GcFkBxNMNGYXM3LORLLY9adkkmqtdqf9N4COAFJU5+LUnO 7kcayPJaX6zj5mjZsWNeSAli3aAaxdYE/1sFiP3Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728307AbgFEOQt (ORCPT ); Fri, 5 Jun 2020 10:16:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:45982 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728298AbgFEOQs (ORCPT ); Fri, 5 Jun 2020 10:16:48 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 631CF20835; Fri, 5 Jun 2020 14:16:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591366607; bh=5ytxPpxU0m3lHoVVGX4RTX2V48UhxcGD1rEGh/T19/c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z+1Zk3GAHb5VyLeSqvzIn8rFSkxF22GRvyWvmJ3bCsw7XweT7MRuF6ZaVLWEhYS9e g8qCa0G94t8548Xox4rwvzrNuxzni6ei7FZwZ9ZaON6gUuf+pmiO5TSgR1qkxrPLOh OTpIEllt3EpU4HhduuDlCDunrndA2Ya9fzCvOXdY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vladimir Stempen , Wenjing Liu , Rodrigo Siqueira , Alex Deucher , Sasha Levin Subject: [PATCH 5.6 21/43] drm/amd/display: DP training to set properly SCRAMBLING_DISABLE Date: Fri, 5 Jun 2020 16:14:51 +0200 Message-Id: <20200605140153.634806305@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200605140152.493743366@linuxfoundation.org> References: <20200605140152.493743366@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Vladimir Stempen [ Upstream commit b6ef55ccba7ed00fc10e3e6f619c8f886162427f ] [Why] DP training sequence to set SCRAMBLING_DISABLE bit properly based on training pattern - per DP Spec. [How] Update dpcd_pattern.v1_4.SCRAMBLING_DISABLE with 1 for TPS1, TPS2, TPS3, but not for TPS4. Signed-off-by: Vladimir Stempen Reviewed-by: Wenjing Liu Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../gpu/drm/amd/display/dc/core/dc_link_dp.c | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 1b6c75a4dd60..fbcd979438e2 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -220,6 +220,30 @@ static enum dpcd_training_patterns return dpcd_tr_pattern; } +static uint8_t dc_dp_initialize_scrambling_data_symbols( + struct dc_link *link, + enum dc_dp_training_pattern pattern) +{ + uint8_t disable_scrabled_data_symbols = 0; + + switch (pattern) { + case DP_TRAINING_PATTERN_SEQUENCE_1: + case DP_TRAINING_PATTERN_SEQUENCE_2: + case DP_TRAINING_PATTERN_SEQUENCE_3: + disable_scrabled_data_symbols = 1; + break; + case DP_TRAINING_PATTERN_SEQUENCE_4: + disable_scrabled_data_symbols = 0; + break; + default: + ASSERT(0); + DC_LOG_HW_LINK_TRAINING("%s: Invalid HW Training pattern: %d\n", + __func__, pattern); + break; + } + return disable_scrabled_data_symbols; +} + static inline bool is_repeater(struct dc_link *link, uint32_t offset) { return (!link->is_lttpr_mode_transparent && offset != 0); @@ -252,6 +276,9 @@ static void dpcd_set_lt_pattern_and_lane_settings( dpcd_pattern.v1_4.TRAINING_PATTERN_SET = dc_dp_training_pattern_to_dpcd_training_pattern(link, pattern); + dpcd_pattern.v1_4.SCRAMBLING_DISABLE = + dc_dp_initialize_scrambling_data_symbols(link, pattern); + dpcd_lt_buffer[DP_TRAINING_PATTERN_SET - DP_TRAINING_PATTERN_SET] = dpcd_pattern.raw;