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Thu, 29 Feb 2024 12:52:43 -0700 Received: from DEN-DL-M31836.microsemi.net (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; Thu, 29 Feb 2024 12:52:40 -0700 From: Horatiu Vultur To: , , , , , , , CC: , , , Horatiu Vultur Subject: [PATCH net-next v2 2/2] net: phy: micrel: lan8814 cable improvement errata Date: Thu, 29 Feb 2024 20:52:20 +0100 Message-ID: <20240229195220.2673049-3-horatiu.vultur@microchip.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240229195220.2673049-1-horatiu.vultur@microchip.com> References: <20240229195220.2673049-1-horatiu.vultur@microchip.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1792264303599051390 X-GMAIL-MSGID: 1792264303599051390 When the length of the cable is more than 100m and the lan8814 is configured to run in 1000Base-T Slave then the register of the device needs to be optimized. Workaround this by setting the measure time to a value of 0xb. This value can be set regardless of the configuration. This issue is described in 'LAN8814 Silicon Errata and Data Sheet Clarification' and according to that, this will not be corrected in a future silicon revision. Signed-off-by: Horatiu Vultur Reviewed-by: Wojciech Drewek --- drivers/net/phy/micrel.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c index 88cc03982bb78..788fdd54fd22d 100644 --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -117,6 +117,10 @@ #define LAN8814_EEE_STATE 0x38 #define LAN8814_EEE_STATE_MASK2P5P BIT(10) +#define LAN8814_PD_CONTROLS 0x9d +#define LAN8814_PD_CONTROLS_PD_MEAS_TIME_MASK_ GENMASK(3, 0) +#define LAN8814_PD_CONTROLS_PD_MEAS_TIME_VAL_ 0xb + /* Represents 1ppm adjustment in 2^32 format with * each nsec contains 4 clock cycles. * The value is calculated as following: (1/1000000)/((2^-32)/4) @@ -3304,6 +3308,20 @@ static void lan8814_clear_2psp_bit(struct phy_device *phydev) lanphy_write_page_reg(phydev, 2, LAN8814_EEE_STATE, val); } +static void lan8814_update_meas_time(struct phy_device *phydev) +{ + u16 val; + + /* By setting the measure time to a value of 0xb this will allow cables + * longer than 100m to be used. This configuration can be used + * regardless of the mode of operation of the PHY + */ + val = lanphy_read_page_reg(phydev, 1, LAN8814_PD_CONTROLS); + val &= ~LAN8814_PD_CONTROLS_PD_MEAS_TIME_MASK_; + val |= LAN8814_PD_CONTROLS_PD_MEAS_TIME_VAL_; + lanphy_write_page_reg(phydev, 1, LAN8814_PD_CONTROLS, val); +} + static int lan8814_probe(struct phy_device *phydev) { const struct kszphy_type *type = phydev->drv->driver_data; @@ -3342,6 +3360,7 @@ static int lan8814_probe(struct phy_device *phydev) /* Errata workarounds */ lan8814_clear_2psp_bit(phydev); + lan8814_update_meas_time(phydev); return 0; }