From nobody Fri Dec 19 04:18:34 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 CE270C77B78 for ; Sat, 22 Apr 2023 11:48:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229721AbjDVLs2 (ORCPT ); Sat, 22 Apr 2023 07:48:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229698AbjDVLsY (ORCPT ); Sat, 22 Apr 2023 07:48:24 -0400 Received: from fudo.makrotopia.org (fudo.makrotopia.org [IPv6:2a07:2ec0:3002::71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B9111FDE; Sat, 22 Apr 2023 04:48:23 -0700 (PDT) Received: from local by fudo.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.96) (envelope-from ) id 1pqBj3-00084E-29; Sat, 22 Apr 2023 13:48:21 +0200 Date: Sat, 22 Apr 2023 12:48:17 +0100 From: Daniel Golle To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Chen Minqiang , Chukun Pan , Yevhen Kolomeiko , Alexander Couzens Subject: [RFC PATCH net-next 1/8] net: phy: realtek: rtl8221: allow to configure SERDES mode Message-ID: <30e4fb909f5fac1734562c9822e5d72b5c0497cf.1682163424.git.daniel@makrotopia.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Alexander Couzens The rtl8221 supports multiple SERDES modes: - SGMII - 2500base-x - HiSGMII Further it supports rate adaption on SERDES links to allow slow ethernet speeds (10/100/1000mbit) to work on 2500base-x/HiSGMII links without reducing the SERDES speed. When operating without rate adapters the SERDES link will follow the ethernet speed. Signed-off-by: Alexander Couzens --- drivers/net/phy/realtek.c | 53 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c index 3d99fd6664d7a..6389abaab6d5a 100644 --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -53,6 +53,15 @@ RTL8201F_ISR_LINK) #define RTL8201F_IER 0x13 =20 +#define RTL8221B_MMD_SERDES_CTRL MDIO_MMD_VEND1 +#define RTL8221B_MMD_PHY_CTRL MDIO_MMD_VEND2 +#define RTL8221B_SERDES_OPTION 0x697a +#define RTL8221B_SERDES_OPTION_MODE_MASK GENMASK(5, 0) +#define RTL8221B_SERDES_OPTION_MODE_2500BASEX_SGMII 0 +#define RTL8221B_SERDES_OPTION_MODE_HISGMII_SGMII 1 +#define RTL8221B_SERDES_OPTION_MODE_2500BASEX 2 +#define RTL8221B_SERDES_OPTION_MODE_HISGMII 3 + #define RTL8366RB_POWER_SAVE 0x15 #define RTL8366RB_POWER_SAVE_ON BIT(12) =20 @@ -849,6 +858,48 @@ static irqreturn_t rtl9000a_handle_interrupt(struct ph= y_device *phydev) return IRQ_HANDLED; } =20 +static int rtl8221b_config_init(struct phy_device *phydev) +{ + u16 option_mode; + + switch (phydev->interface) { + case PHY_INTERFACE_MODE_2500BASEX: + if (!phydev->is_c45) { + option_mode =3D RTL8221B_SERDES_OPTION_MODE_2500BASEX; + break; + } + fallthrough; + case PHY_INTERFACE_MODE_SGMII: + option_mode =3D RTL8221B_SERDES_OPTION_MODE_2500BASEX_SGMII; + break; + default: + return 0; + } + + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, + 0x75f3, 0); + + phy_modify_mmd_changed(phydev, RTL8221B_MMD_SERDES_CTRL, + RTL8221B_SERDES_OPTION, + RTL8221B_SERDES_OPTION_MODE_MASK, option_mode); + switch (option_mode) { + case RTL8221B_SERDES_OPTION_MODE_2500BASEX_SGMII: + case RTL8221B_SERDES_OPTION_MODE_2500BASEX: + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6a04, 0x0503); + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f10, 0xd455); + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f11, 0x8020); + break; + case RTL8221B_SERDES_OPTION_MODE_HISGMII_SGMII: + case RTL8221B_SERDES_OPTION_MODE_HISGMII: + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6a04, 0x0503); + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f10, 0xd433); + phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f11, 0x8020); + break; + } + + return 0; +} + static struct phy_driver realtek_drvs[] =3D { { PHY_ID_MATCH_EXACT(0x00008201), @@ -1001,6 +1052,7 @@ static struct phy_driver realtek_drvs[] =3D { PHY_ID_MATCH_EXACT(0x001cc849), .name =3D "RTL8221B-VB-CG 2.5Gbps PHY", .get_features =3D rtl822x_get_features, + .config_init =3D rtl8221b_config_init, .config_aneg =3D rtl822x_config_aneg, .read_status =3D rtl822x_read_status, .suspend =3D genphy_suspend, @@ -1012,6 +1064,7 @@ static struct phy_driver realtek_drvs[] =3D { .name =3D "RTL8221B-VM-CG 2.5Gbps PHY", .get_features =3D rtl822x_get_features, .config_aneg =3D rtl822x_config_aneg, + .config_init =3D rtl8221b_config_init, .read_status =3D rtl822x_read_status, .suspend =3D genphy_suspend, .resume =3D rtlgen_resume, --=20 2.40.0