From nobody Mon Dec 15 21:27:21 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37EE5C38142 for ; Tue, 17 Jan 2023 23:32:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229536AbjAQXc0 (ORCPT ); Tue, 17 Jan 2023 18:32:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230039AbjAQXbf (ORCPT ); Tue, 17 Jan 2023 18:31:35 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E94FF8CE79; Tue, 17 Jan 2023 12:57:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1673989040; x=1705525040; h=from:to:subject:date:message-id:in-reply-to:references: mime-version; bh=zwa4GW5jWlP5YXzoa6EZS1ONEyHsZM9zF0qwfkL82oY=; b=u/cPn3TBeaR7EUtcKm9aOx3pra/8vg/XJL8x7k6vollR0PPHlZabuPmD VUDMITc39AlgMjmA6KUcI3SPEuHrQeIKdmAtCwtC4JkAXAr7bdk+1YzHi wLm2+RExXuGDcIls924eXxfHlg/oVwaIEDdF/2Y6SpD4yHkAcowdxEIuq Vsk6B1AdrHaDAd3GqYeJx1rKTeZVjHkvI3bb5OVZUgEQKnZT3n2hKEBAO EESgYc+pnOdQTWKYstzYSZhB5y2guR8D9UTXP/nAvWEq0e5SkkxgXvVbQ 5bIFgbRFSkTL0HV69rlSgmn7cCGb5NyMwwCsYTYTKeuaJxFr4QzOlELzR w==; X-IronPort-AV: E=Sophos;i="5.97,224,1669100400"; d="scan'208";a="132797655" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 17 Jan 2023 13:57:15 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Tue, 17 Jan 2023 13:57:15 -0700 Received: from AUS-LT-C33025.microchip.com (10.10.115.15) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Tue, 17 Jan 2023 13:57:13 -0700 From: Jerry Ray To: Andrew Lunn , Florian Fainelli , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , "Paolo Abeni" , Russell King , , , , Jerry Ray Subject: [net-next: PATCH v7 4/7] dsa: lan9303: write reg only if necessary Date: Tue, 17 Jan 2023 14:57:00 -0600 Message-ID: <20230117205703.25960-5-jerry.ray@microchip.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230117205703.25960-1-jerry.ray@microchip.com> References: <20230117205703.25960-1-jerry.ray@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As the regmap_write() is over a slow bus that will sleep, we can speed up the boot-up time a bit by not bothering to clear a bit that is already clear. Signed-off-by: Jerry Ray --- drivers/net/dsa/lan9303-core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c index 66466d50d015..a4decf42a002 100644 --- a/drivers/net/dsa/lan9303-core.c +++ b/drivers/net/dsa/lan9303-core.c @@ -915,8 +915,11 @@ static int lan9303_setup(struct dsa_switch *ds) if (ret) return (ret); =20 - reg &=3D ~LAN9303_VIRT_SPECIAL_TURBO; - regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg); + /* Clear the TURBO Mode bit if it was set. */ + if (reg & LAN9303_VIRT_SPECIAL_TURBO) { + reg &=3D ~LAN9303_VIRT_SPECIAL_TURBO; + regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg); + } =20 ret =3D lan9303_setup_tagging(chip); if (ret) --=20 2.17.1