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Miller" , Jakub Kicinski Cc: philippe.schenker@toradex.com, Francesco Dolcini , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: phy: micrel: ksz9131 led errata workaround Date: Wed, 6 Oct 2021 09:37:55 +0200 Message-Id: <20211006073755.429469-1-francesco.dolcini@toradex.com> X-Mailer: git-send-email 2.25.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: GV0P278CA0045.CHEP278.PROD.OUTLOOK.COM (2603:10a6:710:29::14) To HE1PR0501MB2602.eurprd05.prod.outlook.com (2603:10a6:3:6d::13) MIME-Version: 1.0 Received: from francesco-nb.toradex.int (93.49.2.63) by GV0P278CA0045.CHEP278.PROD.OUTLOOK.COM (2603:10a6:710:29::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.18 via Frontend Transport; Wed, 6 Oct 2021 07:38:12 +0000 Received: by francesco-nb.toradex.int (Postfix, from userid 1000) id 4BF6F10A3887; Wed, 6 Oct 2021 09:38:11 +0200 (CEST) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 319a607c-73e0-41bb-52db-08d9889c4055 X-MS-TrafficTypeDiagnostic: HE1PR05MB3468: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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Workaround this by setting bit 9 of register 0x1e after verifying that the LED configuration is Individual Mode. This issue is described in KSZ9131RNX Silicon Errata DS80000693B (http://ww1.microchip.com/downloads/en/DeviceDoc/80000863A.pdf) and according to that it will not be corrected in a future silicon revision. Signed-off-by: Francesco Dolcini --- drivers/net/phy/micrel.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index c330a5a9f665..661dedec84c4 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -1003,6 +1003,23 @@ static int ksz9131_config_rgmii_delay(struct phy_device *phydev) txcdll_val); } +/* Silicon Errata DS80000693B + * + * When LEDs are configured in Individual Mode, LED1 is ON in a no-link + * condition. Workaround is to set register 0x1e, bit 9, this way LED1 behaves + * according to the datasheet (off if there is no link). + */ + +static int ksz9131_led_errata(struct phy_device *phydev) +{ + int ret = 0; + + if (phy_read_mmd(phydev, 2, 0) & BIT(4)) + ret = phy_set_bits(phydev, 0x1e, BIT(9)); + + return ret; +} + static int ksz9131_config_init(struct phy_device *phydev) { struct device_node *of_node; @@ -1058,6 +1075,10 @@ static int ksz9131_config_init(struct phy_device *phydev) if (ret < 0) return ret; + ret = ksz9131_led_errata(phydev); + if (ret < 0) + return ret; + return 0; } -- 2.25.1