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Received: from nwd2mta2.analog.com (137.71.25.57) by BL2NAM02FT052.mail.protection.outlook.com (10.152.77.0) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.20.2157.15 via Frontend Transport; Fri, 9 Aug 2019 13:36:17 +0000 Received: from NWD2HUBCAS7.ad.analog.com (nwd2hubcas7.ad.analog.com [10.64.69.107]) by nwd2mta2.analog.com (8.13.8/8.13.8) with ESMTP id x79DaHId025736 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=OK); Fri, 9 Aug 2019 06:36:17 -0700 Received: from saturn.ad.analog.com (10.48.65.113) by NWD2HUBCAS7.ad.analog.com (10.64.69.107) with Microsoft SMTP Server id 14.3.408.0; Fri, 9 Aug 2019 09:36:16 -0400 From: Alexandru Ardelean To: , , CC: , , , , , , Alexandru Ardelean Subject: [PATCH v3 10/14] net: phy: adin: implement PHY subsystem software reset Date: Fri, 9 Aug 2019 16:35:48 +0300 Message-ID: <20190809133552.21597-11-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190809133552.21597-1-alexandru.ardelean@analog.com> References: <20190809133552.21597-1-alexandru.ardelean@analog.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRoutedOnPrem: True X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.57;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(39860400002)(376002)(136003)(346002)(396003)(2980300002)(189003)(199004)(305945005)(50226002)(5660300002)(8936002)(86362001)(2870700001)(106002)(2201001)(107886003)(47776003)(1076003)(14444005)(4326008)(126002)(2906002)(2616005)(476003)(336012)(44832011)(486006)(11346002)(7636002)(426003)(446003)(36756003)(48376002)(50466002)(316002)(110136005)(70206006)(186003)(70586007)(54906003)(76176011)(7696005)(51416003)(478600001)(26005)(246002)(356004)(8676002)(6666004);DIR:OUT;SFP:1101;SCL:1;SRVR:DM6PR03MB4153;H:nwd2mta2.analog.com;FPR:;SPF:Pass;LANG:en;PTR:nwd2mail11.analog.com;MX:1;A:1; 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The standard PHY reset via BMCR_RESET bit in MII_BMCR reg 2. Reset via GPIO 3. Reset via reg GeSftRst (0xff0c) & reload previous pin configs 4. Reset via reg GeSftRst (0xff0c) & request new pin configs Resets 2 & 4 are almost identical, with the exception that the crystal oscillator is available during reset for 2. As it turns out, phylib already supports GPIO reset. In case this is configured, the PHY driver won't do anything. In case it isn't specified the subsystem software reset will kick in. Resetting via GeSftRst or via GPIO is useful when doing a warm reboot, because this will reset the subsystem registers to default values. Signed-off-by: Alexandru Ardelean --- drivers/net/phy/adin.c | 43 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c index bd002103f083..63b57c83de91 100644 --- a/drivers/net/phy/adin.c +++ b/drivers/net/phy/adin.c @@ -6,6 +6,7 @@ */ #include #include +#include #include #include #include @@ -53,6 +54,9 @@ #define ADIN1300_CLOCK_STOP_REG 0x9400 #define ADIN1300_LPI_WAKE_ERR_CNT_REG 0xa000 +#define ADIN1300_GE_SOFT_RESET_REG 0xff0c +#define ADIN1300_GE_SOFT_RESET BIT(0) + #define ADIN1300_GE_RGMII_CFG_REG 0xff23 #define ADIN1300_GE_RGMII_RX_MSK GENMASK(8, 6) #define ADIN1300_GE_RGMII_RX_SEL(x) \ @@ -457,11 +461,49 @@ static int adin_read_status(struct phy_device *phydev) return genphy_read_status(phydev); } +static int adin_subsytem_soft_reset(struct phy_device *phydev) +{ + int reg, rc, i; + + rc = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, + ADIN1300_GE_SOFT_RESET_REG, + ADIN1300_GE_SOFT_RESET); + if (rc < 0) + return rc; + + for (i = 0; i < 20; i++) { + usleep_range(500, 1000); + reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, + ADIN1300_GE_SOFT_RESET_REG); + if (reg < 0 || (reg & ADIN1300_GE_SOFT_RESET)) + continue; + return 0; + } + + return -ETIMEDOUT; +} + +static int adin_reset(struct phy_device *phydev) +{ + /* If there is a reset GPIO just exit */ + if (!IS_ERR_OR_NULL(phydev->mdio.reset_gpio)) + return 0; + + /* Reset PHY core regs & subsystem regs */ + return adin_subsytem_soft_reset(phydev); +} + +static int adin_probe(struct phy_device *phydev) +{ + return adin_reset(phydev); +} + static struct phy_driver adin_driver[] = { { PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200), .name = "ADIN1200", .config_init = adin_config_init, + .probe = adin_probe, .config_aneg = adin_config_aneg, .read_status = adin_read_status, .ack_interrupt = adin_phy_ack_intr, @@ -475,6 +517,7 @@ static struct phy_driver adin_driver[] = { PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300), .name = "ADIN1300", .config_init = adin_config_init, + .probe = adin_probe, .config_aneg = adin_config_aneg, .read_status = adin_read_status, .ack_interrupt = adin_phy_ack_intr, -- 2.20.1