From patchwork Tue May 3 13:15:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 569279 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 688F3C433F5 for ; Tue, 3 May 2022 13:22:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236092AbiECN0E (ORCPT ); Tue, 3 May 2022 09:26:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46406 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236091AbiECN0D (ORCPT ); Tue, 3 May 2022 09:26:03 -0400 Received: from mailout1.hostsharing.net (mailout1.hostsharing.net [83.223.95.204]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A91D36B7C; Tue, 3 May 2022 06:22:30 -0700 (PDT) Received: from h08.hostsharing.net (h08.hostsharing.net [IPv6:2a01:37:1000::53df:5f1c:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.hostsharing.net", Issuer "RapidSSL TLS DV RSA Mixed SHA256 2020 CA-1" (verified OK)) by mailout1.hostsharing.net (Postfix) with ESMTPS id 0352C101917A2; Tue, 3 May 2022 15:22:29 +0200 (CEST) Received: from localhost (unknown [89.246.108.87]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id D52C9630FA12; Tue, 3 May 2022 15:22:28 +0200 (CEST) X-Mailbox-Line: From f78b5f725fe75265f884ef0b35389fd45cd81471 Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: References: From: Lukas Wunner Date: Tue, 3 May 2022 15:15:03 +0200 Subject: [PATCH net-next v2 3/7] usbnet: smsc95xx: Don't reset PHY behind PHY driver's back To: "David S. Miller" , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org, Steve Glendinning , UNGLinuxDriver@microchip.com, Oliver Neukum , Andre Edich , Oleksij Rempel , Martyn Welch , Gabriel Hojda , Christoph Fritz , Lino Sanfilippo , Philipp Rosenberger , Heiner Kallweit , Andrew Lunn , Russell King , Ferry Toth Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org smsc95xx_reset() resets the PHY behind the PHY driver's back, which seems like a bad idea generally. Remove that portion of the function. We're about to use PHY interrupts instead of polling to detect link changes on SMSC LAN95xx chips. Because smsc95xx_reset() is called from usbnet_open(), PHY interrupt settings are lost whenever the net_device is brought up. There are two other callers of smsc95xx_reset(), namely smsc95xx_bind() and smsc95xx_reset_resume(), and both may indeed benefit from a PHY reset. However they already perform one through their calls to phy_connect_direct() and phy_init_hw(). Tested-by: Oleksij Rempel # LAN9514/9512/9500 Tested-by: Ferry Toth # LAN9514 Signed-off-by: Lukas Wunner Cc: Martyn Welch Cc: Gabriel Hojda --- drivers/net/usb/smsc95xx.c | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index 2cb44d65bbc3..6c37c7adde1b 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -887,24 +887,6 @@ static int smsc95xx_reset(struct usbnet *dev) return ret; } - ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_); - if (ret < 0) - return ret; - - timeout = 0; - do { - msleep(10); - ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf); - if (ret < 0) - return ret; - timeout++; - } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100)); - - if (timeout >= 100) { - netdev_warn(dev->net, "timeout waiting for PHY Reset\n"); - return ret; - } - ret = smsc95xx_set_mac_address(dev); if (ret < 0) return ret;