From patchwork Thu Oct 3 16:21:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tarun Alle X-Patchwork-Id: 13821252 X-Patchwork-Delegate: kuba@kernel.org Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) (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 2D4C81A3AB7; Thu, 3 Oct 2024 16:26:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.153.233 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727972799; cv=none; b=kgF129q7cUAyttAnqVAfr7ltBX2WvDQL0PCDVRqLAs60U1arlAIXUzTchL2Z4LusV9qarwG03+gVXBXtw7SdOcAnOrnlCXlgCojsU9FwsuE98DED2eJSq9i7434Uk11FDcUOF888O94Qw/JayPglKAZvCtL1oftJDRKdlbsedMo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727972799; c=relaxed/simple; bh=+EWm9ovp3FONrNswzRV2ocgiTP0QhZsdLG0Iv6QGQTk=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=G8Tk7dJeOTQEkp25MxDQhC8UHAKPuWMEvJsUgcFRH6icPUCdOna8PNe1zHzSY7ZaVOCQISIS5TJ9HfKXbS/9h3zRe2GBkx4IujHo63BM0hnnVUvEXB00jIWyLuB/0/S5BigfXd6oWuLXcg7BnC4+WXKx42D5uMa5xNQN59Ab5zs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com; spf=pass smtp.mailfrom=microchip.com; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b=hRoFIT8v; arc=none smtp.client-ip=68.232.153.233 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=microchip.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="hRoFIT8v" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1727972797; x=1759508797; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=+EWm9ovp3FONrNswzRV2ocgiTP0QhZsdLG0Iv6QGQTk=; b=hRoFIT8vO/zWe8GjufeMus8W7UkGjCaYtTV6yv/aIF7yEGk0KW1qgemO DMewxe0Auo8B7mOZPamExRmCTc6DTAhxJuVMVzNTFBjqecXn+enLAwxTa a2YnBJUGn1uEAGh0QExRlXJ1WZHFY8UUROC5TWK9IBv71radkjUr1F0Js D4T7w/5Fi6Rk+yZClloY1+3doaZsYqsKCv5O7kJNfG8E7DA3y5T0lEz3P cEc0Gg0+TMqUIjsZwVoZTtHq5+WldPmFJqIMqptom7xAbtei+3ieWvpaD E8AwrnNu5uJDQnZCSMkd8jeZMNPbfa/79cWNbx09xPN+Lptq6lU/I1c9l g==; X-CSE-ConnectionGUID: EJyWgJZ7TvOBIF+vRJDc2A== X-CSE-MsgGUID: S8KfLE8gR3OHapzlvornXg== X-IronPort-AV: E=Sophos;i="6.11,175,1725346800"; d="scan'208";a="263610546" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa5.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 03 Oct 2024 09:26:31 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.87.72) by chn-vm-ex02.mchp-main.com (10.10.87.72) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 3 Oct 2024 09:26:09 -0700 Received: from HYD-DK-UNGSW20.microchip.com (10.10.85.11) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Thu, 3 Oct 2024 09:26:06 -0700 From: Tarun Alle To: , , , , , , , , , , Subject: [PATCH net-next v5] net: phy: microchip_t1: SQI support for LAN887x Date: Thu, 3 Oct 2024 21:51:18 +0530 Message-ID: <20241003162118.232123-1-tarun.alle@microchip.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Tarun Alle Add support for measuring Signal Quality Index for LAN887x T1 PHY. Signal Quality Index (SQI) is measure of Link Channel Quality from 0 to 7, with 7 as the best. By default, a link loss event shall indicate an SQI of 0. Signed-off-by: Tarun Alle Reviewed-by: Andrew Lunn --- v4 -> v5 - Renamed and organised the macros of SQI samples. v3 -> v4 - Added check to handle invalid samples. - Added macro for ARRAY_SIZE(rawtable). v2 -> v3 - Replaced hard-coded values with ARRAY_SIZE(rawtable). v1 -> v2 - Replaced hard-coded 200 with ARRAY_SIZE(rawtable). - Replaced return value -EINVAL with -ENETDOWN. - Changed link checks. --- drivers/net/phy/microchip_t1.c | 172 +++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) diff --git a/drivers/net/phy/microchip_t1.c b/drivers/net/phy/microchip_t1.c index a5ef8fe50704..69e01692db65 100644 --- a/drivers/net/phy/microchip_t1.c +++ b/drivers/net/phy/microchip_t1.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -226,6 +227,35 @@ #define MICROCHIP_CABLE_MAX_TIME_DIFF \ (MICROCHIP_CABLE_MIN_TIME_DIFF + MICROCHIP_CABLE_TIME_MARGIN) +#define LAN887X_COEFF_PWR_DN_CONFIG_100 0x0404 +#define LAN887X_COEFF_PWR_DN_CONFIG_100_V 0x16d6 +#define LAN887X_SQI_CONFIG_100 0x042e +#define LAN887X_SQI_CONFIG_100_V 0x9572 +#define LAN887X_SQI_MSE_100 0x483 + +#define LAN887X_POKE_PEEK_100 0x040d +#define LAN887X_POKE_PEEK_100_EN BIT(0) + +#define LAN887X_COEFF_MOD_CONFIG 0x080d +#define LAN887X_COEFF_MOD_CONFIG_DCQ_COEFF_EN BIT(8) + +#define LAN887X_DCQ_SQI_STATUS 0x08b2 + +/* SQI raw samples count */ +#define SQI_SAMPLES 200 + +/* Samples percentage considered for SQI calculation */ +#define SQI_INLINERS_PERCENT 60 + +/* Samples count considered for SQI calculation */ +#define SQI_INLIERS_NUM (SQI_SAMPLES * SQI_INLINERS_PERCENT / 100) + +/* Start offset of samples */ +#define SQI_INLIERS_START ((SQI_SAMPLES - SQI_INLIERS_NUM) / 2) + +/* End offset of samples */ +#define SQI_INLIERS_END (SQI_INLIERS_START + SQI_INLIERS_NUM) + #define DRIVER_AUTHOR "Nisar Sayed " #define DRIVER_DESC "Microchip LAN87XX/LAN937x/LAN887x T1 PHY driver" @@ -1830,6 +1860,146 @@ static int lan887x_cable_test_get_status(struct phy_device *phydev, return lan887x_cable_test_report(phydev); } +/* Compare block to sort in ascending order */ +static int sqi_compare(const void *a, const void *b) +{ + return *(u16 *)a - *(u16 *)b; +} + +static int lan887x_get_sqi_100M(struct phy_device *phydev) +{ + u16 rawtable[SQI_SAMPLES]; + u32 sqiavg = 0; + u8 sqinum = 0; + int rc, i; + + /* Configuration of SQI 100M */ + rc = phy_write_mmd(phydev, MDIO_MMD_VEND1, + LAN887X_COEFF_PWR_DN_CONFIG_100, + LAN887X_COEFF_PWR_DN_CONFIG_100_V); + if (rc < 0) + return rc; + + rc = phy_write_mmd(phydev, MDIO_MMD_VEND1, LAN887X_SQI_CONFIG_100, + LAN887X_SQI_CONFIG_100_V); + if (rc < 0) + return rc; + + rc = phy_read_mmd(phydev, MDIO_MMD_VEND1, LAN887X_SQI_CONFIG_100); + if (rc != LAN887X_SQI_CONFIG_100_V) + return -EINVAL; + + rc = phy_modify_mmd(phydev, MDIO_MMD_VEND1, LAN887X_POKE_PEEK_100, + LAN887X_POKE_PEEK_100_EN, + LAN887X_POKE_PEEK_100_EN); + if (rc < 0) + return rc; + + /* Required before reading register + * otherwise it will return high value + */ + msleep(50); + + /* Link check before raw readings */ + rc = genphy_c45_read_link(phydev); + if (rc < 0) + return rc; + + if (!phydev->link) + return -ENETDOWN; + + /* Get 200 SQI raw readings */ + for (i = 0; i < SQI_SAMPLES; i++) { + rc = phy_write_mmd(phydev, MDIO_MMD_VEND1, + LAN887X_POKE_PEEK_100, + LAN887X_POKE_PEEK_100_EN); + if (rc < 0) + return rc; + + rc = phy_read_mmd(phydev, MDIO_MMD_VEND1, + LAN887X_SQI_MSE_100); + if (rc < 0) + return rc; + + rawtable[i] = (u16)rc; + } + + /* Link check after raw readings */ + rc = genphy_c45_read_link(phydev); + if (rc < 0) + return rc; + + if (!phydev->link) + return -ENETDOWN; + + /* Sort SQI raw readings in ascending order */ + sort(rawtable, SQI_SAMPLES, sizeof(u16), sqi_compare, NULL); + + /* Keep inliers and discard outliers */ + for (i = SQI_INLIERS_START; i < SQI_INLIERS_END; i++) + sqiavg += rawtable[i]; + + /* Handle invalid samples */ + if (sqiavg != 0) { + /* Get SQI average */ + sqiavg /= SQI_INLIERS_NUM; + + if (sqiavg < 75) + sqinum = 7; + else if (sqiavg < 94) + sqinum = 6; + else if (sqiavg < 119) + sqinum = 5; + else if (sqiavg < 150) + sqinum = 4; + else if (sqiavg < 189) + sqinum = 3; + else if (sqiavg < 237) + sqinum = 2; + else if (sqiavg < 299) + sqinum = 1; + else + sqinum = 0; + } + + return sqinum; +} + +static int lan887x_get_sqi(struct phy_device *phydev) +{ + int rc, val; + + if (phydev->speed != SPEED_1000 && + phydev->speed != SPEED_100) { + return -ENETDOWN; + } + + if (phydev->speed == SPEED_100) + return lan887x_get_sqi_100M(phydev); + + /* Writing DCQ_COEFF_EN to trigger a SQI read */ + rc = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, + LAN887X_COEFF_MOD_CONFIG, + LAN887X_COEFF_MOD_CONFIG_DCQ_COEFF_EN); + if (rc < 0) + return rc; + + /* Wait for DCQ done */ + rc = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1, + LAN887X_COEFF_MOD_CONFIG, val, ((val & + LAN887X_COEFF_MOD_CONFIG_DCQ_COEFF_EN) != + LAN887X_COEFF_MOD_CONFIG_DCQ_COEFF_EN), + 10, 200, true); + if (rc < 0) + return rc; + + rc = phy_read_mmd(phydev, MDIO_MMD_VEND1, LAN887X_DCQ_SQI_STATUS); + if (rc < 0) + return rc; + + return FIELD_GET(T1_DCQ_SQI_MSK, rc); +} + static struct phy_driver microchip_t1_phy_driver[] = { { PHY_ID_MATCH_MODEL(PHY_ID_LAN87XX), @@ -1881,6 +2051,8 @@ static struct phy_driver microchip_t1_phy_driver[] = { .read_status = genphy_c45_read_status, .cable_test_start = lan887x_cable_test_start, .cable_test_get_status = lan887x_cable_test_get_status, + .get_sqi = lan887x_get_sqi, + .get_sqi_max = lan87xx_get_sqi_max, } };