From patchwork Sat Sep 17 00:07:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Couzens X-Patchwork-Id: 12978915 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7FFBEECAAD8 for ; Sat, 17 Sep 2022 00:17:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=D4aHrls4IlhChNJEiFIwdElFeTSuTNb1gdIpf42Rmas=; b=3ST3TmMxgkF0Ei QqeYjalq+JkrMkjM4pAqIOiZ/DWL9vAbArrwRUiajj+YHhvSpIJ9LmUo3s7wDsZE19PxsQqjxBk1C 5jmTeLtINlbp3O/gCL50SYUfBQz/gzAt+a4lv5mrqIJkfyozvZlgdztiRJMjh5NFdRWaUTMTsBvOP VZ8mW+pXYw5XujkAhP4M3Ubkq9d/vzm+3RgwcRv0hAfHmbHK5BnAYvwvjn0s6EbQtyIJi4iG4yHjO mxOWV6gHcweFFatLkXriGE6AW6r0PBvdtMXRjKUdJJBEkEWlIeYVk+ui7SoSURdB42z9Oyz1iu6Iz Br8tbnshm40m5HMX7cZw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oZLUP-000mCT-Db; Sat, 17 Sep 2022 00:15:21 +0000 Received: from mail.base45.de ([80.241.60.77]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oZLUK-000m6T-8r; Sat, 17 Sep 2022 00:15:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=fe80.eu; s=20190804; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=IkyT/SH0Avq5x9pAHQMFR5EvWvl2e975Bdszn8X9P9s=; b=S54Kp3bJO79v4211GDHYBIU+zV jL4e6Kja0mIZtuKhYb1cRkkeMIonNJEhCBWwuJ0t0JZs2F/R1XvxH1q3vxwuDYPZJXNO084kWy0um AlWk/CNQgTbt5NlPEWtmEV0kpiIBsUxNmRfzfNNe4mWnwPpNFb2v07r1VCgrVrBI5j5U8JQtkCvrY 7cH5FhJjm7IEosL5ErHj0P/THGgTtwjERmZDd4rs/MnMQOi4x1z8OYBMuIXh1xeYheF6Iai1xV2Gw bjGN5PsS5W4i/5dyVTBKZ2w3rImDsxJzkYVzgK3K27MND4jvM0/2HTtyr7LNMPrYUFhuTGIsbcjmk aSG5Fj2Q==; Received: from p4fd2bf05.dip0.t-ipconnect.de ([79.210.191.5] helo=localhost.localdomain) by mail.base45.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1oZLNF-000nP7-FD; Sat, 17 Sep 2022 00:07:57 +0000 From: Alexander Couzens To: Sean Wang , Landen Chao , DENG Qingfang , Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Matthias Brugger Cc: Alexander Couzens , Landen Chao , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH net v2 2/2] net: mt7531: ensure all MACs are powered down before reset Date: Sat, 17 Sep 2022 02:07:34 +0200 Message-Id: <20220917000734.520253-3-lynxis@fe80.eu> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220917000734.520253-1-lynxis@fe80.eu> References: <20220917000734.520253-1-lynxis@fe80.eu> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220916_171517_362289_2C2AB161 X-CRM114-Status: UNSURE ( 9.55 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The datasheet [1] explicit describes it as requirement for a reset. [1] MT7531 Reference Manual for Development Board rev 1.0, page 735 Signed-off-by: Alexander Couzens --- drivers/net/dsa/mt7530.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index 95a57aeb466e..409d5c3d76ea 100644 --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -2329,6 +2329,10 @@ mt7531_setup(struct dsa_switch *ds) return -ENODEV; } + /* all MACs must be forced link-down before sw reset */ + for (i = 0; i < MT7530_NUM_PORTS; i++) + mt7530_write(priv, MT7530_PMCR_P(i), MT7531_FORCE_LNK); + /* Reset the switch through internal reset */ mt7530_write(priv, MT7530_SYS_CTRL, SYS_CTRL_PHY_RST | SYS_CTRL_SW_RST |