From: Tristram Ha Date: Fri, 25 Jul 2025 00:17:53 +0000 (-0700) Subject: net: dsa: microchip: Disable PTP function of KSZ8463 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=620e2392db235ba3b9e9619912aadb8cadee15e7;p=thirdparty%2Flinux.git net: dsa: microchip: Disable PTP function of KSZ8463 The PTP function of KSZ8463 is on by default. However, its proprietary way of storing timestamp directly in a reserved field inside the PTP message header is not suitable for use with the current Linux PTP stack implementation. It is necessary to disable the PTP function to not interfere the normal operation of the MAC. Note the PTP driver for KSZ switches does not work for KSZ8463 and is not activated for it. Signed-off-by: Tristram Ha Reviewed-by: Andrew Lunn Link: https://patch.msgid.link/20250725001753.6330-7-Tristram.Ha@microchip.com Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/dsa/microchip/ksz8.c b/drivers/net/dsa/microchip/ksz8.c index 62224426a9bd0..c400e1c0369e3 100644 --- a/drivers/net/dsa/microchip/ksz8.c +++ b/drivers/net/dsa/microchip/ksz8.c @@ -1760,6 +1760,17 @@ void ksz8_config_cpu_port(struct dsa_switch *ds) KSZ8463_REG_DSP_CTRL_6, COPPER_RECEIVE_ADJUSTMENT, 0); } + + /* Turn off PTP function as the switch's proprietary way of + * handling timestamp is not supported in current Linux PTP + * stack implementation. + */ + regmap_update_bits(ksz_regmap_16(dev), + KSZ8463_PTP_MSG_CONF1, + PTP_ENABLE, 0); + regmap_update_bits(ksz_regmap_16(dev), + KSZ8463_PTP_CLK_CTRL, + PTP_CLK_ENABLE, 0); } }