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Mon, 9 Nov 2026 09:48:43 -0500 From: Iustin Stolniceanu To: Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Stefan Eichenberger , , CC: Iustin Stolniceanu Subject: [PATCH net v2] net: phy: c45: select BASE-T1 type for the forced speed Date: Mon, 9 Nov 2026 16:48:37 +0200 Message-ID: <20261109144837.738619-1-iustin.stolniceanu@analog.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: RpdlgAug7x65dcsCCOoibpGE4bl8IhcJ X-Proofpoint-ORIG-GUID: RpdlgAug7x65dcsCCOoibpGE4bl8IhcJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA5MDA1OCBTYWx0ZWRfX5tU0zs4cfid6 1thA+BNU6NHa4rLZg0rxnVi4nmC1N291oJZ2AEEK0ZSTEwl82axvQvR4JLUJsFm5wGvtLHi6MSc WU27j6iTYUi+B/4UWggMp9z/n3IJ7JcWuCAppjjK690EWePdW0s1R4bK63mJY3EzpWUg/Kb3G1i zyA1hIQbql+S/jnniKnyQiz6xwYEJIyF13OH72J6h7yUGRCMug+yC8NXjIS7gqLK3wIxIFcll7u 5PACTvhdhQO52xJfj6mKx+DT1jyoN+47OPLLUs6TE7G2FYaNvX89wOTpgl47518IPDdxXoXECKY q+v6J11z4CJqyBPrtN1wRo6nPYfUQTPeqbDGUghzzst16mLF7iGrWmTDQmZlHwHvHMlpiHLtHwO 4bTH/2H3TNguS9jiyxOr3IWhD4eQrWbFa2qVpKHeljO7FmpczmsO8YGT0N15Sn/nWYHC+tsiqCv 5+CrIZjdma2Ht9g6xug== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA5MDA1OCBTYWx0ZWRfX0fXogKLOAdf5 tUb0Ym6tXUIeMuPE2ASBDHQm9qGJJrCLcJAVpWSQhp+m15j9+AQ60KoHLbcmCZdDwYD7VtFDVxm wQfJNXM+erJDXVuFXkJvUnsN+swZfZfiwyehxtk3Huk6SLNjsbKf X-Authority-Analysis: v=2.4 cv=IuiL47/g c=1 sm=1 tr=0 ts=6af1dd59 cx=c_pps a=PpDZqlmH/M8setHirZLBMw==:117 a=PpDZqlmH/M8setHirZLBMw==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=OmVn7CZJonkx5R5zMQLL:22 a=VwQbUJbxAAAA:8 a=gAnH3GRIAAAA:8 a=kTs4aKTdxJRZGFSXfREA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-09_05,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 suspectscore=0 clxscore=1015 malwarescore=0 spamscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611090058 Commit 25108a834e14 ("net: phy: c45: add support for 1000BASE-T1 forced setup") made genphy_c45_pma_setup_forced() write the type selection field (bits 3:0) of the BASE-T1 PMA/PMD control register (1.2100) on every forced setup: 1000BASE-T1 for SPEED_1000, and 0 for everything else. 0 selects 100BASE-T1, so forcing a 10BASE-T1L PHY to 10 Mbit/s now also switches its PMA to 100BASE-T1, a mode it does not implement. Seen on an ADIN1110 (internal ADIN1100 PHY): after ethtool -s ethX autoneg off speed 10 master-slave forced-master 1.2100 reads 0xc000 instead of the 0xc002. Since the field is not restored by re-enabling autoneg, the PHY keeps the wrong type until the next forced setup or reset. Add a helper that returns the type selection value for the forced speed and the supported link modes: 100BASE-T1, 1000BASE-T1, and 10BASE-T1L or 10BASE-T1S for SPEED_10 depending on the supported 10 Mbit/s modes. Fail with -EINVAL when no type matches instead of writing 100BASE-T1. This also applies to forced 2.5G, 5G and 10G on BASE-T1 capable PHYs, for which there are no link modes yet. The field is called "type selection" in IEEE 802.3-2022 (45.2.1.214, Table 45-178). Keep the old STRAP names as aliases. Tested on EVAL-ADIN1110EBZ: with this change, forcing 10 Mbit/s writes 1.2100 = 0xc002 (10BASE-T1L) instead of the invalid 0xc000. Fixes: 25108a834e14 ("net: phy: c45: add support for 1000BASE-T1 forced setup") Signed-off-by: Iustin Stolniceanu --- Changes in v2 (review by Andrew Lunn): - Name the type selection values after 802.3-2022 (Table 45-178) and define all of them, including 2.5GBASE-T1, 5GBASE-T1 and 10GBASE-T1. The old STRAP name comes from 6f1c646d88c5 and is kept as an alias for userspace. - Add a helper that returns the type selection for the forced speed and the supported link modes, also covering 10BASE-T1S. It returns -EINVAL when no type matches instead of writing 100BASE-T1, which also applies to forced 2.5G, 5G and 10G on BASE-T1 capable PHYs. - Resolve the type before the first register write, so a failure leaves the PHY untouched (reported by the Sashiko review bot). - Retitle the patch, as it is no longer specific to 10BASE-T1L. - Link to v1: https://lore.kernel.org/r/20261104152534.1425241-1-iustin.stolniceanu@analog.com drivers/net/phy/phy-c45.c | 46 ++++++++++++++++++++++++++++++++++----- include/uapi/linux/mdio.h | 13 +++++++++-- 2 files changed, 52 insertions(+), 7 deletions(-) diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c index 870920311f9a..8334678df841 100644 --- a/drivers/net/phy/phy-c45.c +++ b/drivers/net/phy/phy-c45.c @@ -104,6 +104,36 @@ int genphy_c45_pma_baset1_setup_master_slave(struct phy_device *phydev) } EXPORT_SYMBOL_GPL(genphy_c45_pma_baset1_setup_master_slave); +/* Type selection value for the BASE-T1 PMA/PMD control register (1.2100, + * 802.3-2022 Table 45-178) matching the forced speed. 10 Mbit/s is ambiguous + * between 10BASE-T1L and 10BASE-T1S, so the supported link modes decide. + * 2.5G, 5G and 10GBASE-T1 are not handled as there are no link modes for them + * yet. + */ +static int genphy_c45_baset1_type_sel(struct phy_device *phydev) +{ + switch (phydev->speed) { + case SPEED_100: + return MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_100BT1; + case SPEED_1000: + return MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_1000BT1; + case SPEED_10: + if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT, + phydev->supported)) + return MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_10BT1L; + if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1S_Full_BIT, + phydev->supported) || + linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1S_Half_BIT, + phydev->supported) || + linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1S_P2MP_Half_BIT, + phydev->supported)) + return MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_10BT1S; + return -EINVAL; + default: + return -EINVAL; + } +} + /** * genphy_c45_pma_setup_forced - configures a forced speed * @phydev: target phy_device struct @@ -166,6 +196,16 @@ int genphy_c45_pma_setup_forced(struct phy_device *phydev) return -EINVAL; } + /* Resolve the type before the first write, so a speed without a + * matching type leaves the PHY untouched. + */ + bt1_ctrl = 0; + if (genphy_c45_baset1_able(phydev)) { + bt1_ctrl = genphy_c45_baset1_type_sel(phydev); + if (bt1_ctrl < 0) + return bt1_ctrl; + } + ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1); if (ret < 0) return ret; @@ -179,12 +219,8 @@ int genphy_c45_pma_setup_forced(struct phy_device *phydev) if (ret < 0) return ret; - bt1_ctrl = 0; - if (phydev->speed == SPEED_1000) - bt1_ctrl = MDIO_PMA_PMD_BT1_CTRL_STRAP_B1000; - ret = phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1_CTRL, - MDIO_PMA_PMD_BT1_CTRL_STRAP, bt1_ctrl); + MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL, bt1_ctrl); if (ret < 0) return ret; } diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h index 06f4bc3c20c7..2806f60ed105 100644 --- a/include/uapi/linux/mdio.h +++ b/include/uapi/linux/mdio.h @@ -417,8 +417,17 @@ #define MDIO_AN_10BT1_AN_STAT_LPA_EEE_T1L 0x4000 /* 10BASE-T1L LP EEE ability advertisement */ /* BASE-T1 PMA/PMD control register */ -#define MDIO_PMA_PMD_BT1_CTRL_STRAP 0x000F /* Type selection (Strap) */ -#define MDIO_PMA_PMD_BT1_CTRL_STRAP_B1000 0x0001 /* Select 1000BASE-T1 */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL 0x000F /* Type selection */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_100BT1 0x0000 /* Select 100BASE-T1 */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_1000BT1 0x0001 /* Select 1000BASE-T1 */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_10BT1L 0x0002 /* Select 10BASE-T1L */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_10BT1S 0x0003 /* Select 10BASE-T1S */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_2P5GBT1 0x0004 /* Select 2.5GBASE-T1 */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_5GBT1 0x0005 /* Select 5GBASE-T1 */ +#define MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_10GBT1 0x0006 /* Select 10GBASE-T1 */ +/* Legacy names, kept for userspace */ +#define MDIO_PMA_PMD_BT1_CTRL_STRAP MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL +#define MDIO_PMA_PMD_BT1_CTRL_STRAP_B1000 MDIO_PMA_PMD_BT1_CTRL_TYPE_SEL_1000BT1 #define MDIO_PMA_PMD_BT1_CTRL_CFG_MST 0x4000 /* MASTER-SLAVE config value */ /* 1000BASE-T1 PCS control register */ base-commit: 241dec6f9ab74d8c3ef246764f3611666b96b9e1 -- 2.43.0