From patchwork Mon Feb 5 19:38:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Reding X-Patchwork-Id: 10201635 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8733B602CA for ; Mon, 5 Feb 2018 19:39:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 787FB205FC for ; Mon, 5 Feb 2018 19:39:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6D56C287DA; Mon, 5 Feb 2018 19:39:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0EA4F287CF for ; Mon, 5 Feb 2018 19:39:49 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DDA2B6E2E7; Mon, 5 Feb 2018 19:39:12 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-qk0-x241.google.com (mail-qk0-x241.google.com [IPv6:2607:f8b0:400d:c09::241]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1D8116E2EA for ; Mon, 5 Feb 2018 19:39:11 +0000 (UTC) Received: by mail-qk0-x241.google.com with SMTP id w128so11718650qkb.5 for ; Mon, 05 Feb 2018 11:39:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references; bh=8twjIWONOvzxUqunn2VW7oDWlH1fpRd8QDswpyVzqlg=; b=bgOhRkrfZ6a5DDge8yZ0/v9BMprB5oTw7gVogh82lfahWEBixG55D3zKaKdYSRZwsw hHwbUPVnp5HGutdag7J//jo2WuWF+Iab8CEWtD09y7/H7/8UmcplL5KwU2dQAlvjVU41 OQi2uIY6FoYg3wLmpBoanjS3Nd98KInIr3KTJSUfx03Hda+oxmuAEvVmVfj0XwC6p2ZP U6aAzwtU6tPmlAWDxZMsKjeS5O/iMkBAN/lkV/hA6yAObgL5d6fJWCeK0aOMYnYkxcEr wFxsNKIX87ymqP19w06v+TYAQm2H7nd3L8s5jBOtozrGG/TtULcIA26kFEoZarGV4i46 jPYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references; bh=8twjIWONOvzxUqunn2VW7oDWlH1fpRd8QDswpyVzqlg=; b=CDrshc1DhpcliUYzrNzudQZ2v3PlQk0l0yNLub16G4ONnvyGYuXlyfFSM5zxcOXta4 h2IChMMCev5tHxS6OJNaPt6Bx6fPQb7l+HITaHI5m4AUul0nQOEsSafbrqdNE85d0xmV u0ld6II8csw7owTkZWqbHBBy0XQfY+hWdThHSF6+ngFfPOMfn+fjV/bypl1HFbSXFlp/ mlI7F32DVI0YlEzlXAZ0Zw50ZVs94drpFzIbuhJVOk1jq3IzYCDop1zUkBC5Q65iq+Vl kV/OenigslJz99JYFkA1BVBkuw+vg+qzLNLOEw4XOLhftp7OYsqqDOFvjOhJujd7pEwI nfVA== X-Gm-Message-State: APf1xPBL/tx/up0sKwDyYpnRcgruhcXu4QlXdp++/oeh7lqX8mgPS8Ws CE32T0vcOxt/ZXRjwCwnv9RAuQ== X-Google-Smtp-Source: AH8x2259w6JusqJhfDLbgR2UiJ0VcsCUZLPAtz4ed59cB1FXruHAUZmX4bACUibPr0fcKzi7Md42SQ== X-Received: by 10.55.6.15 with SMTP id 15mr8719596qkg.285.1517859549931; Mon, 05 Feb 2018 11:39:09 -0800 (PST) Received: from localhost (p200300E41F41B00009B231EAB1BE76D4.dip0.t-ipconnect.de. [2003:e4:1f41:b000:9b2:31ea:b1be:76d4]) by smtp.gmail.com with ESMTPSA id m77sm6439056qkh.13.2018.02.05.11.39.09 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 05 Feb 2018 11:39:09 -0800 (PST) From: Thierry Reding To: dri-devel@lists.freedesktop.org Subject: [PATCH 15/17] drm/dp: Set channel coding on link configuration Date: Mon, 5 Feb 2018 20:38:25 +0100 Message-Id: <20180205193827.20374-16-thierry.reding@gmail.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180205193827.20374-1-thierry.reding@gmail.com> References: <20180205193827.20374-1-thierry.reding@gmail.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Thierry Reding Make use of ANSI 8B/10B channel coding if the DisplayPort sink supports it. Signed-off-by: Thierry Reding --- drivers/gpu/drm/drm_dp_helper.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index f1a7f18ab795..828dc091b015 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -526,7 +526,7 @@ EXPORT_SYMBOL(drm_dp_link_power_down); */ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) { - u8 values[2]; + u8 values[2], value = 0; int err; values[0] = drm_dp_link_rate_to_bw_code(link->rate); @@ -539,6 +539,13 @@ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) if (err < 0) return err; + if (link->caps.channel_coding) + value = DP_SET_ANSI_8B10B; + + err = drm_dp_dpcd_writeb(aux, DP_MAIN_LINK_CHANNEL_CODING_SET, value); + if (err < 0) + return err; + return 0; } EXPORT_SYMBOL(drm_dp_link_configure);