From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 D1189C433B4 for ; Fri, 23 Apr 2021 05:30:12 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 6C1D1613F2 for ; Fri, 23 Apr 2021 05:30:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6C1D1613F2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; 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=ZI9FAQvek1FdVtez6zeY8f8Ur83PM7oTaWoCHnX1Vg4=; b=IXXcik7fYcxt+UAxQz8aH+5f3 /3EIpwWJxOh+kc8hmMk3dK9Z9TKIvK6S4cu1dkSucV8UkI/JA6pbUeMbrw0+upN6xwsHYpuXrusCM /x1Uw81sXwXGEc59zGjfgMQHIRRBVNO/YgRskK4QvMReT9RzrEeOoKbXopP4k0xPGLE7+16HHYBmk D2SJPxAUPEjU6Xh1RHEWdF85gdxyrzdtBcZyMWbWdhOYcRgQ0KQUmi3FvVilQms8q+V1Xf4nEsVIe Spf83D7vman4r2y+9B2S5ji6iUEkVrhQW6c8CwV3mAk9HVq5unE+IWwGxL6dfoDaioHo9fy4hEbtI eEfHAeCpg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lZoM5-000gGN-34; Fri, 23 Apr 2021 05:27:53 +0000 Received: from mail-pl1-x635.google.com ([2607:f8b0:4864:20::635]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lZoGt-000fY3-Nd; Fri, 23 Apr 2021 05:23:58 +0000 Received: by mail-pl1-x635.google.com with SMTP id 20so20722768pll.7; Thu, 22 Apr 2021 22:22:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=oCguuBzXzGvGn2bpnQzkSyzGRllJCSh+eewGXVSf1rE=; b=MHMI7yDYGqn8zq/FZ4jyCKzBzBSGVUpLws/egw5RYREDUwNt1/5nibN5vsTSaK0mPJ 5XMBffQrNzw6+e9/43KdK9qgdT0sn5bob2n2/3b1ahrzQ5STCqZFqXHhrURRRn3AVZTf hE64u9uDhJNNcaTRAyo7FVGPM6M4a99+V1266y0wwrC7WfyVJsg4bmCGBnGQwd1Y1d4S 4+g8sNZ+cOIgY3E657sYN2VWja0DbyhJLommN264eB8JKGLfVIV+TBkR/UDOtwIIuU6h 2lAqU9L0iZAjoClMeQ0ac2cAFE8AYLuyaLWIPBEUTJq3htUUcHuQ9+aIXpfC9thWRjQI CL2g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=oCguuBzXzGvGn2bpnQzkSyzGRllJCSh+eewGXVSf1rE=; b=Z1nU//jzhe941kjLos1d4E/rYFkzUVZq+dmEatuhEZdtqYdgSjCUL6a19lJsbPGML4 CJTmzvYfnK25eSkSeownZOJM43EGU0uDYj26v7i+ZNT7Q9uftXf2sEdyPRVLbN3si/77 +bLwgbdKPnNdsIGf7Z6ewDFMrmj0SNLy4oRVgVCRMkneTtyV7jGWTH8XB7omHCiNK38e dOr/053vSpXAWtyZfe1pl71XQH61sk3o1nFjkWHaGzVME2kLILqX5kzCiJgN7ys16mDX ilFxqdPwBmm9o6cZ+7e5HTRNVdggdUDfmwhsU60Ia5mvItDHb/U9XWLUAgpvlfKYWwTL BgJw== X-Gm-Message-State: AOAM532Px4AzWAMBKoGdvSaP/qBg2hkrzDxr/k4tllzCUcb17i1efatt htLdvo4vap7UQfHzb8wbMJo= X-Google-Smtp-Source: ABdhPJxXEwjA66TlNmzYlUZCuMfuAaRE+874S9Bqpa0e67m7LPYgUUhtbwPh1eTSX8cCwirlRy23Ag== X-Received: by 2002:a17:90a:2acb:: with SMTP id i11mr2381934pjg.131.1619155282437; Thu, 22 Apr 2021 22:21:22 -0700 (PDT) Received: from z640-arch.lan ([2602:61:7344:f100::678]) by smtp.gmail.com with ESMTPSA id y24sm6238825pjp.26.2021.04.22.22.21.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Apr 2021 22:21:22 -0700 (PDT) From: Ilya Lipnitskiy To: Felix Fietkau , John Crispin , Sean Wang , Mark Lee , "David S. Miller" , Jakub Kicinski , Matthias Brugger , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Ilya Lipnitskiy Subject: [PATCH net-next v2 05/15] net: ethernet: mtk_eth_soc: reduce MDIO bus access latency Date: Thu, 22 Apr 2021 22:20:58 -0700 Message-Id: <20210423052108.423853-6-ilya.lipnitskiy@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210423052108.423853-1-ilya.lipnitskiy@gmail.com> References: <20210423052108.423853-1-ilya.lipnitskiy@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210423_062334_377707_1D931E81 X-CRM114-Status: GOOD ( 13.73 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Felix Fietkau usleep_range often ends up sleeping much longer than the 10-20us provided as a range here. This causes significant latency in mdio bus acceses, which easily adds multiple seconds to the boot time on MT7621 when polling DSA slave ports. Use cond_resched instead of usleep_range, since the MDIO access does not take much time Signed-off-by: Felix Fietkau Signed-off-by: Ilya Lipnitskiy --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 5cf64de3ddf8..d992d4f1f400 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -86,7 +86,7 @@ static int mtk_mdio_busy_wait(struct mtk_eth *eth) return 0; if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT)) break; - usleep_range(10, 20); + cond_resched(); } dev_err(eth->dev, "mdio: MDIO timeout\n"); -- 2.31.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel