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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Frank , linux-kernel@vger.kernel.org Subject: [PATCH net-next v2 2/2] net: phy: motorcomm: Add cable test support for internal YT861x PHYs Date: Wed, 7 Oct 2026 04:23:48 +0800 Message-ID: <20261006202352.1616626-3-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261006202352.1616626-1-mmyangfl@gmail.com> References: <20261006202352.1616626-1-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 3ebd911f4400..2a7af80d7845 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 @@ -3205,6 +3316,8 @@ 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