From nobody Sat Nov 30 12:50:35 2024 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) (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 D00D913B797; Mon, 9 Sep 2024 16:15:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.154.123 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725898505; cv=none; b=acnZwTPS7QK/RHbFMDaHCAJCbXTpMMVUd2JfA/3sGH0hXyVYmozhVV2AgJZY9XQzGACBhanhvU62v8y35Bn/YIwvQWnRYf0d/l711xi03w9XVln5uQRSp8UHVeIJsO6WL+szM+p0eBdQRxtb9P90oK2h+AyqhQpoSD73qCTs4xE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725898505; c=relaxed/simple; bh=s0SRACD5cJWhVk2UVXJJxtcwx52keFG+0hezbZQuQv0=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=rNnXjAmimLeobHupNQDTDKJPEZ16/w6f0p9Hv/yI2emfYfb9DcfDLfDJ7JqBFJHSjQLwBDdCiZm7BBi1joQguRunNQ/k4f3h/g0shBwKVj+KEH2CnOT9UINvAaLtd85eZppFwjPIYc6eY+ptn3YnSYUuuD8KwbnPNMTaU2mBmpk= 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=B+PJqDF8; arc=none smtp.client-ip=68.232.154.123 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="B+PJqDF8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1725898504; x=1757434504; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=s0SRACD5cJWhVk2UVXJJxtcwx52keFG+0hezbZQuQv0=; b=B+PJqDF8zj4CMMGtt5P9n44QZK4MITCRaxzvgv7nAsgYd5qUlDbVQFwy Jl+k9F8JNIoaWKzZrrVO6jDrw6fwIYCPU1D+1sVDRQwcsnZWo24NuenHy fdejXX72l+f46BAAdNH496gycZFgRj9iK1MagevXgwJ8rkcetpikudu/d iAnZ87frHlh0cxSDZ7yk33RSNAh2yII3hswq+a0gtqqa1U97MMog+8f12 O4xn3We5PGcdXlOn0tMN0uLU4uxP6J4K7PBP8UgNASMu2WkbtpOpLp6HX GXum3dcNYAXajcKrnAQziUwULSoFSoW2FXqhNRjrD26hgj+xoq6dwQzKO Q==; X-CSE-ConnectionGUID: /l7ZEX7ESFyFyUXrQHRLEQ== X-CSE-MsgGUID: YZZLYTS6S3emqsSsllcWMg== X-IronPort-AV: E=Sophos;i="6.10,214,1719903600"; d="scan'208";a="32161723" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa2.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 09 Sep 2024 09:15:02 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 9 Sep 2024 09:14:47 -0700 Received: from HYD-DK-UNGSW20.microchip.com (10.10.85.11) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Mon, 9 Sep 2024 09:14:43 -0700 From: Tarun Alle To: , , , , , , , , , , Subject: [PATCH net-next V2] net: phy: microchip_t1: SQI support for LAN887x Date: Mon, 9 Sep 2024 21:40:05 +0530 Message-ID: <20240909161005.185122-1-tarun.alle@microchip.com> X-Mailer: git-send-email 2.34.1 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 Content-Type: text/plain; charset="utf-8" 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 --- v1->v2 Addressed below review comments - Replaced hard-coded 200 with ARRAY_SIZE(rawtable). - Replaced return value -EINVAL with -ENETDOWN. - Changed link checks. --- drivers/net/phy/microchip_t1.c | 154 +++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) diff --git a/drivers/net/phy/microchip_t1.c b/drivers/net/phy/microchip_t1.c index 5732ad65e7f9..22a5214acf86 100644 --- a/drivers/net/phy/microchip_t1.c +++ b/drivers/net/phy/microchip_t1.c @@ -2,6 +2,7 @@ // Copyright (C) 2018 Microchip Technology =20 #include +#include #include #include #include @@ -188,6 +189,20 @@ #define LAN887X_EFUSE_READ_DAT9_SGMII_DIS BIT(9) #define LAN887X_EFUSE_READ_DAT9_MAC_MODE GENMASK(1, 0) =20 +#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 + #define DRIVER_AUTHOR "Nisar Sayed " #define DRIVER_DESC "Microchip LAN87XX/LAN937x/LAN887x T1 PHY driver" =20 @@ -1420,6 +1435,143 @@ static void lan887x_get_strings(struct phy_device *= phydev, u8 *data) ethtool_puts(&data, lan887x_hw_stats[i].string); } =20 +/* Compare block to sort in ascending order */ +static int data_compare(const void *a, const void *b) +{ + return *(u16 *)a - *(u16 *)b; +} + +static int lan887x_get_sqi_100M(struct phy_device *phydev) +{ + u16 rawtable[200]; + u32 sqiavg =3D 0; + u8 sqinum; + int rc; + + /* Configuration of SQI 100M */ + rc =3D 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 =3D phy_write_mmd(phydev, MDIO_MMD_VEND1, LAN887X_SQI_CONFIG_100, + LAN887X_SQI_CONFIG_100_V); + if (rc < 0) + return rc; + + rc =3D phy_read_mmd(phydev, MDIO_MMD_VEND1, LAN887X_SQI_CONFIG_100); + if (rc !=3D LAN887X_SQI_CONFIG_100_V) + return -EINVAL; + + rc =3D 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 =3D genphy_c45_read_link(phydev); + if (rc < 0) + return rc; + + if (!phydev->link) + return -ENETDOWN; + + /* Get 200 SQI raw readings */ + for (int i =3D 0; i < ARRAY_SIZE(rawtable); i++) { + rc =3D phy_write_mmd(phydev, MDIO_MMD_VEND1, + LAN887X_POKE_PEEK_100, + LAN887X_POKE_PEEK_100_EN); + if (rc < 0) + return rc; + + rc =3D phy_read_mmd(phydev, MDIO_MMD_VEND1, + LAN887X_SQI_MSE_100); + if (rc < 0) + return rc; + + rawtable[i] =3D rc; + } + + /* Link check after raw readings */ + rc =3D genphy_c45_read_link(phydev); + if (rc < 0) + return rc; + + if (!phydev->link) + return -ENETDOWN; + + /* Sort SQI raw readings in ascending order */ + sort(rawtable, ARRAY_SIZE(rawtable), sizeof(u16), data_compare, NULL); + + /* Keep inliers and discard outliers */ + for (int i =3D 40; i < 160; i++) + sqiavg +=3D rawtable[i]; + + /* Get SQI average */ + sqiavg /=3D 120; + + if (sqiavg < 75) + sqinum =3D 7; + else if (sqiavg < 94) + sqinum =3D 6; + else if (sqiavg < 119) + sqinum =3D 5; + else if (sqiavg < 150) + sqinum =3D 4; + else if (sqiavg < 189) + sqinum =3D 3; + else if (sqiavg < 237) + sqinum =3D 2; + else if (sqiavg < 299) + sqinum =3D 1; + else + sqinum =3D 0; + + return sqinum; +} + +static int lan887x_get_sqi(struct phy_device *phydev) +{ + int rc, val; + + if (phydev->speed !=3D SPEED_1000 && + phydev->speed !=3D SPEED_100) { + return -ENETDOWN; + } + + if (phydev->speed =3D=3D SPEED_100) + return lan887x_get_sqi_100M(phydev); + + /* Writing DCQ_COEFF_EN to trigger a SQI read */ + rc =3D 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 =3D phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1, + LAN887X_COEFF_MOD_CONFIG, val, ((val & + LAN887X_COEFF_MOD_CONFIG_DCQ_COEFF_EN) !=3D + LAN887X_COEFF_MOD_CONFIG_DCQ_COEFF_EN), + 10, 200, true); + if (rc < 0) + return rc; + + rc =3D 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[] =3D { { PHY_ID_MATCH_MODEL(PHY_ID_LAN87XX), @@ -1468,6 +1620,8 @@ static struct phy_driver microchip_t1_phy_driver[] = =3D { .suspend =3D genphy_suspend, .resume =3D genphy_resume, .read_status =3D genphy_c45_read_status, + .get_sqi =3D lan887x_get_sqi, + .get_sqi_max =3D lan87xx_get_sqi_max, } }; =20 --=20 2.34.1