From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D44DF3DEAD3 for ; Fri, 9 Oct 2026 18:00:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791568806; cv=none; b=MVKGEOx+I95tesLVD6S7YQZ+Uc53jF9Qg6XiVJqK65yJNyMGiirRTyccjHXaJ631fCFPtS796R2/iIR8o56d43SPh3Pn7qbEQaP9Ew3Bn1o6CZFL5uMwiPM1kZ+av/YXo5XKw/JiPfvSAuq6JHZj3Cty3CRme4/FK3A9lvIxl/g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791568806; c=relaxed/simple; bh=6eO1+2LSIMyeX89pykPYiWNjudyGGYV6WVeZKC5N3Lo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ES8NKZZjJe/AmeVFT1TCYN146FIkhA0gVcsS2SmOFCpBK9JEPcYuVn1EYhzTYglabK49RiAP4dfLH4qf3dibAOO2rh5MpEhcgDAj68IHh3cKdVKd7HJ0NlqqU875qF0d5SyMHiSfpKU9oBukxGr9NHkSr8QdZJp1Mvr3qBDqJOQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=TwtIKqi5; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TwtIKqi5" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-2dd9ec41bc4so28187685ad.2 for ; Fri, 09 Oct 2026 11:00:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1791568804; x=1792173604; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=3YdCEn0KQsIpCkNxLw2Z2IuU9/i3yh0cW61Up5RxhiQ=; b=TwtIKqi5EvJGdh3DTKUX/o4vfLYofmrhwY/r1rM48anIPK+tAAvzyaqR+fny7Hw9Ve duNg6qYnF6+x48SsIGFtpNqKNziINkhEzIs3XQoqSR7yenTXSKDrDPEmGw5l/zqwCc/F mL6srKxTiSkAGyoykSj64Z9nSpRXIO6uYNe54Lu7fdL3KmRUJRtNh72E5SHwblMHFHTT ogMwIQJfQIc9QS7aazQIgQjRoLn1SAzRWgKY880jfCDF10kOSA3iqG5rqYh+p80JoSgS iVzGFwlRnwSJ5N/05Ot0jnX1yF7svUd8JOQ/Q8qbhk6MB6MK/w4Aop+740I7A+sc5+NK ozNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791568804; x=1792173604; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=3YdCEn0KQsIpCkNxLw2Z2IuU9/i3yh0cW61Up5RxhiQ=; b=MdR235cCfBiXQnQaok1feGnBAtnVVWq3Zn9i4oYiKzUBPE2hwc2tdan6TcNT6IUQn4 8sjGliEnvrCxNe/w/gh+FYagVmCnPZVwCGTdeIGOlTBKGYQpLmXCnASOvWI2rH06Rh8g GDD8XJ1F4jsGlmQcKYzmaBbzP1griAzfNPt8zPlDASx2au9xac+j+3gO7c9+alrRWSwe MY3bWaxk4ZnAgdyZ6SGUxP6O09qmQtlo54/uMS/Sdf9/eb+xOXH5hVTBS+9jSFYXdNkJ czzylxtRyWJ8XVfGkB7F9mHlb8pUL6KwGhWozCmE1JAgxnE+Yrkjcd0jslIOIUFbxxjB y9fg== X-Gm-Message-State: AFq9FYJ0Muip6SrV9I/4mwSLSlgcCxOd3IhNrrFAuVYqeFF9AjtHU0zT hJUKjs3bZ8nGM8/5IXm8mIgzYPEx2iOJ0drewFZYf34BFGcuaYXSJcvw6LureafZ X-Gm-Gg: AYBFou18uC9cwgkVqumz+jwwjFjzqreyhsjoy4LTm4CVeCtClf0Vd7vWqU/uC8lk8cu U/yH7uCF+JIYEjdRv/hA6w+yTNtYk+G4eCUoOSQC+nLPZkbX6KazfHKoePE5nDWbQPoXHG397G4 IEf3Q65IpN+HTukmDZTAXBiW1B846UIFV3gdT/b39OP8WV13uSVOBFgfamqMFt7s5vUze1too+l YV+AzR7o/Vt/kMUzAorZdt1HzfYxd53PN39GxW/ukv18u26ax6b+tXnij1z4pirVMxQZKToyTWx C2K3F8W5NfNmAYndZTwdUwsRsJAEmKL7zYHDX1l1pE7swF2JQigCpkGAtEF68LVqSdvhgqTHd9X tzUokhdLW55ijHnFSn3HtZ7xzVXljytBgFm4yNu1py7XSLpnTWB1zsnng6+8ItUA5Pgr/70cXzs o7ZfPtU/Md4t1dJbuaSl+BHpE3J+SFlGGrSDMXD41ApA8nX883eTWMcPgrpFMOsJybNw8YtBwHG JCe/XRTcuYeRQ4xRanlX5Vtug== X-Received: by 2002:a17:902:ec84:b0:2dd:c100:b2c2 with SMTP id d9443c01a7336-2e842cdf949mr24077305ad.45.1791568803937; Fri, 09 Oct 2026 11:00:03 -0700 (PDT) Received: from d.home.yangfl.dn42 ([2a09:bac5:661c:1246::1d2:d1]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e84219e74asm14167105ad.29.2026.10.09.10.59.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2026 11:00:02 -0700 (PDT) From: David Yang To: netdev@vger.kernel.org Cc: David Yang , Frank , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiner Kallweit , Russell King , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v3 3/3] net: phy: motorcomm: Add cable test support for internal YT861x PHYs Date: Sat, 10 Oct 2026 01:59:32 +0800 Message-ID: <20261009175936.428256-4-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261009175936.428256-1-mmyangfl@gmail.com> References: <20261009175936.428256-1-mmyangfl@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add TDR cable test support for the internal YT861x PHYs, reporting the per-pair result and the fault length. Signed-off-by: David Yang --- drivers/net/phy/motorcomm.c | 113 ++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c index 7078c4a0225d..463e1ea3efc9 100644 --- a/drivers/net/phy/motorcomm.c +++ b/drivers/net/phy/motorcomm.c @@ -8,6 +8,7 @@ #include #include +#include #include #include #include @@ -300,6 +301,19 @@ #define YT8531_SCR_CLK_SRC_REF_25M 4 #define YT8531_SCR_CLK_SRC_SSC_25M 5 +/* TDR (cable diagnostic) test control */ +#define YT861X_TDR_CTRL_REG 0x80 +#define YT861X_TDR_CTRL_START BIT(0) + +#define YT861X_TDR_STATUS_REG 0x84 +#define YT861X_TDR_STATUS_BUSY BIT(15) +#define YT861X_TDR_STATUS_PAIR_OK 0 +#define YT861X_TDR_STATUS_PAIR_UNKNOWN 1 +#define YT861X_TDR_STATUS_PAIR_SHORT 2 +#define YT861X_TDR_STATUS_PAIR_OPEN 3 + +#define YT861X_TDR_PAIR_LENGTH_REG(n) (0x87 + (n)) /* in cm */ + #define YT8821_SDS_EXT_CSR_CTRL_REG 0x23 #define YT8821_SDS_EXT_CSR_VCO_LDO_EN BIT(15) #define YT8821_SDS_EXT_CSR_VCO_BIAS_LPF_EN BIT(8) @@ -2563,6 +2577,103 @@ static int yt861x_config_init(struct phy_device *phydev) sleep ? YT8521_ESC1R_SLEEP_SW : 0); } +/** + * yt861x_cable_test_start() - start a cable diagnostic (TDR) test + * @phydev: a pointer to a &struct phy_device + * + * Returns: 0 or negative errno code + */ +static int yt861x_cable_test_start(struct phy_device *phydev) +{ + int ret; + + /* auto sleep would abort the TDR test */ + ret = ytphy_modify_ext_with_lock(phydev, + YT8521_EXTREG_SLEEP_CONTROL1_REG, + YT8521_ESC1R_SLEEP_SW, 0); + if (ret) + return ret; + + ret = ytphy_write_ext_with_lock(phydev, YT861X_TDR_CTRL_REG, + YT861X_TDR_CTRL_START); + if (ret) { + int err = yt861x_config_init(phydev); + + if (err) + phydev_warn(phydev, + "Failed to restore auto sleep: %d\n", + err); + } + + return ret; +} + +/** + * yt861x_cable_test_get_status() - report cable diagnostic test results + * @phydev: a pointer to a &struct phy_device + * @finished: set to true when the test is complete + * + * Returns: 0 or negative errno code + */ +static int yt861x_cable_test_get_status(struct phy_device *phydev, + bool *finished) +{ + int status; + int ret; + + *finished = false; + + status = ytphy_read_ext_with_lock(phydev, YT861X_TDR_STATUS_REG); + if (status < 0) + return status; + + if (status & YT861X_TDR_STATUS_BUSY) + return 0; + + for (int pair = ETHTOOL_A_CABLE_PAIR_A; pair <= ETHTOOL_A_CABLE_PAIR_D; + pair++) { + u8 code; + + switch ((status >> (2 * pair)) & 0x3) { + case YT861X_TDR_STATUS_PAIR_OK: + code = ETHTOOL_A_CABLE_RESULT_CODE_OK; + break; + case YT861X_TDR_STATUS_PAIR_SHORT: + code = ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT; + break; + case YT861X_TDR_STATUS_PAIR_OPEN: + code = ETHTOOL_A_CABLE_RESULT_CODE_OPEN; + break; + default: + code = ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC; + } + + ethnl_cable_test_result(phydev, pair, code); + + if (code != ETHTOOL_A_CABLE_RESULT_CODE_OK && + code != ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC) { + ret = ytphy_read_ext_with_lock(phydev, + YT861X_TDR_PAIR_LENGTH_REG(pair)); + if (ret >= 0) + ethnl_cable_test_fault_length(phydev, pair, + ret); + } + } + + /* the reset below does not restore auto sleep by itself */ + ret = yt861x_config_init(phydev); + if (ret) + return ret; + + ret = genphy_soft_reset(phydev); + if (ret) + return ret; + + *finished = true; + + return 0; +} + /** * yt8821_get_features - read mmd register to get 2.5G capability * @phydev: target phy_device struct @@ -3206,6 +3317,8 @@ static struct phy_driver motorcomm_phy_drvs[] = { .soft_reset = genphy_soft_reset, .suspend = genphy_suspend, .resume = genphy_resume, + .cable_test_start = yt861x_cable_test_start, + .cable_test_get_status = yt861x_cable_test_get_status, }, { PHY_ID_MATCH_EXACT(PHY_ID_YT8821), -- 2.53.0