From patchwork Wed Dec 20 13:22:12 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Zapolskiy X-Patchwork-Id: 10125679 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 0269460388 for ; Wed, 20 Dec 2017 13:22:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EBC4922380 for ; Wed, 20 Dec 2017 13:22:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E0B8126E55; Wed, 20 Dec 2017 13:22:50 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4DF6522380 for ; Wed, 20 Dec 2017 13:22:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=vjQ3BRb6enMQM6qvTI3plJuUzcQ06ESON6Q9DoVZhWA=; b=agLkmQOIX5/YBx MLwLLSmc8VXAnxaLudg6thzrfYksPXwJIw/s4XiTqnZlK5Tfbs5CCyZHBjCYe9pWC8vCcFwatUEps ZBUlyYclMzjog2Zf9wEuU4eOhB01uwndWZH2Yh78q+Ukg5RhdYK4R4uxkXs6a+rPbRihtRR8DJEFv 1ksWGUCg/NJq1iGNYC30hSMZZ6FFsqy6yB5SKd6NLGpk+RUjhlpzvMhzLP+psa5v53SnFl7JGROhO jMP2ALeRegd6/H57JHsntTTqbQ1e8MEeepp8Vn7OGVjN8C82Tx/In7BDtlGNc58FqB73nqbObzwfF MpVeIPIbY7VAZFdeM4HA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1eReKd-0007AA-JY; Wed, 20 Dec 2017 13:22:47 +0000 Received: from relay1.mentorg.com ([192.94.38.131]) by bombadil.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1eReKY-00078U-Ur for linux-arm-kernel@lists.infradead.org; Wed, 20 Dec 2017 13:22:44 +0000 Received: from nat-ies.mentorg.com ([192.94.31.2] helo=SVR-IES-MBX-04.mgc.mentorg.com) by relay1.mentorg.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-SHA384:256) id 1eReKQ-00058l-GG from Vladimir_Zapolskiy@mentor.com ; Wed, 20 Dec 2017 05:22:34 -0800 Received: from eyas.local (137.202.0.87) by SVR-IES-MBX-04.mgc.mentorg.com (139.181.222.4) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Wed, 20 Dec 2017 13:22:30 +0000 From: Vladimir Zapolskiy To: Simon Horman , Sergei Shtylyov Subject: [PATCH 2/2] arm64: dts: renesas: ulcb: Remove renesas, no-ether-link property Date: Wed, 20 Dec 2017 15:22:12 +0200 Message-ID: <1513776132-22700-3-git-send-email-vladimir_zapolskiy@mentor.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1513776132-22700-1-git-send-email-vladimir_zapolskiy@mentor.com> References: <1513776132-22700-1-git-send-email-vladimir_zapolskiy@mentor.com> MIME-Version: 1.0 X-Originating-IP: [137.202.0.87] X-ClientProxiedBy: svr-ies-mbx-02.mgc.mentorg.com (139.181.222.2) To SVR-IES-MBX-04.mgc.mentorg.com (139.181.222.4) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171220_052243_008060_86583CDD X-CRM114-Status: GOOD ( 10.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bogdan Mirea , linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Bogdan Mirea The present change is a bug fix for AVB link iteratively up/down. Steps to reproduce: - start AVB TX stream (Using aplay via MSE), - disconnect+reconnect the eth cable, - after a reconnection the eth connection goes iteratively up/down without user interaction, - this may heal after some seconds or even stay for minutes. As the documentation specifies, the "renesas,no-ether-link" option should be used when a board does not provide a proper AVB_LINK signal. There is no need for this option enabled on RCAR H3/M3 Salvator-X/XS and ULCB starter kits since the AVB_LINK is correctly handled by HW. Choosing to keep or remove the "renesas,no-ether-link" option will have impact on the code flow in the following ways: - keeping this option enabled may lead to unexpected behavior since the RX & TX are enabled/disabled directly from adjust_link function without any HW interrogation, - removing this option, the RX & TX will only be enabled/disabled after HW interrogation. The HW check is made through the LMON pin in PSR register which specifies AVB_LINK signal value (0 - at low level; 1 - at high level). In conclusion, the present change is also a safety improvement because it removes the "renesas,no-ether-link" option leading to a proper way of detecting the link state based on HW interrogation and not on software heuristic. Signed-off-by: Bogdan Mirea Signed-off-by: Vladimir Zapolskiy --- arch/arm64/boot/dts/renesas/ulcb.dtsi | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm64/boot/dts/renesas/ulcb.dtsi b/arch/arm64/boot/dts/renesas/ulcb.dtsi index be91016e0b48..3e7a6b94e9f8 100644 --- a/arch/arm64/boot/dts/renesas/ulcb.dtsi +++ b/arch/arm64/boot/dts/renesas/ulcb.dtsi @@ -145,7 +145,6 @@ &avb { pinctrl-0 = <&avb_pins>; pinctrl-names = "default"; - renesas,no-ether-link; phy-handle = <&phy0>; status = "okay";