From nobody Fri Feb 13 15:42:40 2026 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9912714882F for ; Wed, 17 Apr 2024 16:43:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713372213; cv=none; b=EsQMMUubK4Q+RWnYyy1p33NyANaXX+ZU3hi+khdIbGO2BN4J/kDn7MbT3d84rBC2GLsvBx5jPb9BHmnaWAhoqPxXv2xvTWjhm+MMPlsdHxxue6BxHYBNXNmt+27QoNXdxe/uu0PI4k5GuGuOr6tnfZV3wRexuBywdtkrVTgDUxM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713372213; c=relaxed/simple; bh=msyoR8psGA34dyrl4EIM/ln6JTeFBgyF/vyuhfWSiuQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ejTtZrFLGNq/UOZgqbjRB2OBylOb9PgkJ25Ui+eow1KAd5iYPwhMPPf6bfaY31mi1DB3G6XY6fm1Z3ivyJcNlmukiEkDSZJVpKS7Gqe4fzwh1qo+cKInXNN+bzyzFO4xTnr2Ip8gIS2aW90FqjI+fr0awjc49r/GO6PJTsfEi2E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rx8NT-0007N2-VR; Wed, 17 Apr 2024 18:43:19 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1rx8NR-00CpCc-RJ; Wed, 17 Apr 2024 18:43:17 +0200 Received: from ore by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1rx8NR-007MeC-2S; Wed, 17 Apr 2024 18:43:17 +0200 From: Oleksij Rempel To: Alexandre Torgue , Jose Abreu , "David S. Miller" , Andrew Lunn , Heiner Kallweit , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Woojung Huh , Arun Ramadoss , Richard Cochran , Russell King Cc: Oleksij Rempel , kernel@pengutronix.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, UNGLinuxDriver@microchip.com, linux-stm32@st-md-mailman.stormreply.com Subject: [PATCH net-next v1 3/4] net: phy: realtek: provide TimeSync data path delays for RTL8211E Date: Wed, 17 Apr 2024 18:43:15 +0200 Message-Id: <20240417164316.1755299-4-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240417164316.1755299-1-o.rempel@pengutronix.de> References: <20240417164316.1755299-1-o.rempel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Provide default data path delays for RTL8211E. The measurements was done against with iMX8MP STMMAC and LAN8841 as the link partner. This values was calculated based on RGMII-PHY-PHY-RGMII measurements, where the link partner is LAN8841. Following values was measured: - data flow from RTL8211E to LAN8841: 746ns @ 1000Mbps 1770ns @ 100Mbps 932000ns @ 10Mbps - data flow from LAN8841 to RTL8211E: 594ns @ 1000Mbps 1130ns @ 100Mbps 8920ns @ 10Mbps Before this patch ptp4l reported following path delays: ~610ns @ 1000Mbps ~942ns @ 100Mbps ~465998ns @ 10Mbps PPS offset compared to grand master was: ~ -114ns @ 1000Mbps ~ -215ns @ 100Mbps ~ -465998ns @ 10Mbps Magnetic - Cable - Magnetic - delay in this setup was about 5ns. Signed-off-by: Oleksij Rempel --- drivers/net/phy/realtek.c | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c index 1fa70427b2a26..e39fec8d166b9 100644 --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -221,6 +221,47 @@ static int rtl8211e_config_intr(struct phy_device *phy= dev) return err; } =20 +static int rtl8211e_get_timesync_data_path_delays(struct phy_device *phyde= v, + struct phy_timesync_delay *tsd) +{ + phydev_warn(phydev, "Time stamping is not supported\n"); + + switch (phydev->interface) { + case PHY_INTERFACE_MODE_RGMII: + case PHY_INTERFACE_MODE_RGMII_RXID: + case PHY_INTERFACE_MODE_RGMII_TXID: + case PHY_INTERFACE_MODE_RGMII_ID: + /* The values are measured with RTL8211E and LAN8841 as link + * partners and confirmed with i211 to be in sane range. + */ + if (phydev->speed =3D=3D SPEED_1000) { + tsd->tx_min_delay_ns =3D 326; + tsd->rx_min_delay_ns =3D 406; + return 0; + } else if (phydev->speed =3D=3D SPEED_100) { + tsd->tx_min_delay_ns =3D 703; + tsd->rx_min_delay_ns =3D 621; + return 0; + } else if (phydev->speed =3D=3D SPEED_10) { + /* This value is suspiciously big, with atypical + * shift to Egress side. This value is confirmed + * by measuring RGMII-PHY-PHY-RGMII path delay. + * Similar results are confirmed with LAN8841 and i211 + * as link partners. + */ + tsd->tx_min_delay_ns =3D 920231; + tsd->rx_min_delay_ns =3D 1674; + return 0; + } + default: + break; + } + + phydev_warn(phydev, "Not tested or not supported modes for path delay val= ues\n"); + + return -EOPNOTSUPP; +} + static int rtl8211f_config_intr(struct phy_device *phydev) { u16 val; @@ -935,6 +976,7 @@ static struct phy_driver realtek_drvs[] =3D { .resume =3D genphy_resume, .read_page =3D rtl821x_read_page, .write_page =3D rtl821x_write_page, + .get_timesync_data_path_delays =3D rtl8211e_get_timesync_data_path_delay= s, }, { PHY_ID_MATCH_EXACT(0x001cc916), .name =3D "RTL8211F Gigabit Ethernet", --=20 2.39.2