From patchwork Tue Jan 9 09:57:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksij Rempel X-Patchwork-Id: 13514708 X-Patchwork-Delegate: kuba@kernel.org 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 225AB36AE1 for ; Tue, 9 Jan 2024 09:58:15 +0000 (UTC) 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 1rN8rr-0007j3-TQ; Tue, 09 Jan 2024 10:57:55 +0100 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 1rN8rq-001Rg1-Ht; Tue, 09 Jan 2024 10:57:54 +0100 Received: from ore by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1rN8rq-007r0c-1X; Tue, 09 Jan 2024 10:57:54 +0100 From: Oleksij Rempel To: "David S. Miller" , Andrew Lunn , Eric Dumazet , Florian Fainelli , Jakub Kicinski , Paolo Abeni , Vladimir Oltean , Woojung Huh , Arun Ramadoss Cc: Oleksij Rempel , kernel@pengutronix.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, UNGLinuxDriver@microchip.com Subject: [RFC net-next v2 3/3] net: dsa: microchip: implement PHY loopback configuration for KSZ8794 and KSZ8873 Date: Tue, 9 Jan 2024 10:57:53 +0100 Message-Id: <20240109095753.1872010-4-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240109095753.1872010-1-o.rempel@pengutronix.de> References: <20240109095753.1872010-1-o.rempel@pengutronix.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Correct the PHY loopback bit handling in the ksz8_w_phy_bmcr and ksz8_r_phy_bmcr functions for KSZ8794 and KSZ8873 variants in the ksz8795 driver. Previously, the code erroneously used Bit 7 of port register 0xD for both chip variants, which is actually for LED configuration. This update ensures the correct registers and bits are used for the PHY loopback feature: - For KSZ8794: Use 0xF / Bit 7. - For KSZ8873: Use 0xD / Bit 0. The lack of loopback support was seen on KSZ8873 system by using "ethtool -t lanX". After this patch, the ethtool selftest will work, but only if port is not part of a bridge. Signed-off-by: Oleksij Rempel --- drivers/net/dsa/microchip/ksz8795.c | 36 ++++++++++++++++++++----- drivers/net/dsa/microchip/ksz8795_reg.h | 1 + 2 files changed, 30 insertions(+), 7 deletions(-) diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c index 51e0194453df..1d8377640a3d 100644 --- a/drivers/net/dsa/microchip/ksz8795.c +++ b/drivers/net/dsa/microchip/ksz8795.c @@ -731,16 +731,25 @@ static int ksz8_r_phy_bmcr(struct ksz_device *dev, u16 port, u16 *val) if (ret) return ret; - if (restart & PORT_PHY_LOOPBACK) - *val |= BMCR_LOOPBACK; - if (ctrl & PORT_FORCE_100_MBIT) *val |= BMCR_SPEED100; if (ksz_is_ksz88x3(dev)) { + if (restart & KSZ8873_PORT_PHY_LOOPBACK) + *val |= BMCR_LOOPBACK; + if ((ctrl & PORT_AUTO_NEG_ENABLE)) *val |= BMCR_ANENABLE; } else { + u8 stat3; + + ret = ksz_pread8(dev, port, REG_PORT_STATUS_3, &stat3); + if (ret) + return ret; + + if (stat3 & PORT_PHY_LOOPBACK) + *val |= BMCR_LOOPBACK; + if (!(ctrl & PORT_AUTO_NEG_DISABLE)) *val |= BMCR_ANENABLE; } @@ -1001,8 +1010,7 @@ static int ksz8_w_phy_bmcr(struct ksz_device *dev, u16 port, u16 val) restart = 0; restart_mask = PORT_LED_OFF | PORT_TX_DISABLE | PORT_AUTO_NEG_RESTART | - PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX | - PORT_PHY_LOOPBACK; + PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX; if (val & KSZ886X_BMCR_DISABLE_LED) restart |= PORT_LED_OFF; @@ -1022,8 +1030,22 @@ static int ksz8_w_phy_bmcr(struct ksz_device *dev, u16 port, u16 val) if (val & KSZ886X_BMCR_FORCE_MDI) restart |= PORT_FORCE_MDIX; - if (val & BMCR_LOOPBACK) - restart |= PORT_PHY_LOOPBACK; + if (ksz_is_ksz88x3(dev)) { + restart_mask |= KSZ8873_PORT_PHY_LOOPBACK; + + if (val & BMCR_LOOPBACK) + restart |= KSZ8873_PORT_PHY_LOOPBACK; + } else { + u8 stat3 = 0; + + if (val & BMCR_LOOPBACK) + stat3 |= PORT_PHY_LOOPBACK; + + ret = ksz_prmw8(dev, port, REG_PORT_STATUS_3, PORT_PHY_LOOPBACK, + stat3); + if (ret) + return ret; + } return ksz_prmw8(dev, port, regs[P_NEG_RESTART_CTRL], restart_mask, restart); diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h index beca974e0171..7c9341ef73b0 100644 --- a/drivers/net/dsa/microchip/ksz8795_reg.h +++ b/drivers/net/dsa/microchip/ksz8795_reg.h @@ -265,6 +265,7 @@ #define PORT_AUTO_MDIX_DISABLE BIT(2) #define PORT_FORCE_MDIX BIT(1) #define PORT_MAC_LOOPBACK BIT(0) +#define KSZ8873_PORT_PHY_LOOPBACK BIT(0) #define REG_PORT_1_STATUS_2 0x1E #define REG_PORT_2_STATUS_2 0x2E