From nobody Mon Feb 9 04:29:07 2026 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 447CEC77B7D for ; Sat, 20 May 2023 16:07:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231858AbjETQHf (ORCPT ); Sat, 20 May 2023 12:07:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229737AbjETQH2 (ORCPT ); Sat, 20 May 2023 12:07:28 -0400 Received: from smtp.missinglinkelectronics.com (smtp.missinglinkelectronics.com [162.55.135.183]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63F0310F for ; Sat, 20 May 2023 09:07:27 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by smtp.missinglinkelectronics.com (Postfix) with ESMTP id ECE4D206AF; Sat, 20 May 2023 18:07:25 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at missinglinkelectronics.com Received: from smtp.missinglinkelectronics.com ([127.0.0.1]) by localhost (mail.missinglinkelectronics.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nJO6GcfklEPP; Sat, 20 May 2023 18:07:25 +0200 (CEST) Received: from humpen-bionic2.mle (p578c5bfe.dip0.t-ipconnect.de [87.140.91.254]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: david) by smtp.missinglinkelectronics.com (Postfix) with ESMTPSA id 6D8AA2061D; Sat, 20 May 2023 18:07:25 +0200 (CEST) From: David Epping To: Andrew Lunn , Heiner Kallweit , Russell King , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, UNGLinuxDriver@microchip.com, David Epping Subject: [PATCH net 3/3] net: phy: mscc: enable VSC8501/2 RGMII RX clock Date: Sat, 20 May 2023 18:06:03 +0200 Message-Id: <20230520160603.32458-4-david.epping@missinglinkelectronics.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230520160603.32458-1-david.epping@missinglinkelectronics.com> References: <20230520160603.32458-1-david.epping@missinglinkelectronics.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" By default the VSC8501 and VSC8502 RGMII RX clock output is disabled. To allow packet forwarding towards the MAC it needs to be enabled. The same may be necessary for GMII and MII modes, but that's currently unclear. For VSC853x and VSC854x the respective disable bit is reserved and the clock output is enabled by default. Signed-off-by: David Epping --- drivers/net/phy/mscc/mscc.h | 1 + drivers/net/phy/mscc/mscc_main.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h index 79cbb2418664..defe5cc6d4fc 100644 --- a/drivers/net/phy/mscc/mscc.h +++ b/drivers/net/phy/mscc/mscc.h @@ -179,6 +179,7 @@ enum rgmii_clock_delay { #define VSC8502_RGMII_CNTL 20 #define VSC8502_RGMII_RX_DELAY_MASK 0x0070 #define VSC8502_RGMII_TX_DELAY_MASK 0x0007 +#define VSC8502_RGMII_RX_CLK_DISABLE 0x0800 =20 #define MSCC_PHY_WOL_LOWER_MAC_ADDR 21 #define MSCC_PHY_WOL_MID_MAC_ADDR 22 diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_m= ain.c index 29fc27a16805..c7a8f5561c66 100644 --- a/drivers/net/phy/mscc/mscc_main.c +++ b/drivers/net/phy/mscc/mscc_main.c @@ -547,6 +547,26 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *= phydev, u32 rgmii_cntl, return rc; } =20 +/* For VSC8501 and VSC8502 the RGMII RX clock output is disabled by defaul= t. */ +static int vsc85xx_rgmii_enable_rx_clk(struct phy_device *phydev, + u32 rgmii_cntl) +{ + int rc, phy_id; + + phy_id =3D phydev->drv->phy_id & phydev->drv->phy_id_mask; + if (PHY_ID_VSC8501 !=3D phy_id && PHY_ID_VSC8502 !=3D phy_id) + return 0; + + mutex_lock(&phydev->lock); + + rc =3D phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2, rgmii_cntl, + VSC8502_RGMII_RX_CLK_DISABLE, 0); + + mutex_unlock(&phydev->lock); + + return rc; +} + static int vsc85xx_default_config(struct phy_device *phydev) { int rc; @@ -559,6 +579,10 @@ static int vsc85xx_default_config(struct phy_device *p= hydev) VSC8502_RGMII_TX_DELAY_MASK); if (rc) return rc; + + rc =3D vsc85xx_rgmii_enable_rx_clk(phydev, VSC8502_RGMII_CNTL); + if (rc) + return rc; } =20 return 0; --=20 2.17.1