6.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
commit de99e1ea3a35f23ff83a31d6b08f43d27b2c6345 upstream.
There are 2 issues with the blamed commit.
1. When the phy is initialized, it would enable the disabled of UDPv4
checksums. The UDPv6 checksum is already enabled by default. So when
1-step is configured then it would clear these flags.
2. After the 1-step is configured, then if 2-step is configured then the
1-step would be still configured because it is not clearing the flag.
So the sync frames will still have origin timestamps set.
Fix this by reading first the value of the register and then
just change bit 12 as this one determines if the timestamp needs to
be inserted in the frame, without changing any other bits.
Fixes: ece19502834d ("net: phy: micrel: 1588 support for LAN8814 phy")
Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
Reviewed-by: Divya Koppera <divya.koppera@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240402071634.2483524-1-horatiu.vultur@xxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/phy/micrel.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -2416,6 +2416,7 @@ static int lan8814_hwtstamp(struct mii_t
struct lan8814_ptp_rx_ts *rx_ts, *tmp;
int txcfg = 0, rxcfg = 0;
int pkt_ts_enable;
+ int tx_mod;
ptp_priv->hwts_tx_type = config->tx_type;
ptp_priv->rx_filter = config->rx_filter;
@@ -2462,9 +2463,14 @@ static int lan8814_hwtstamp(struct mii_t
lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_RX_TIMESTAMP_EN, pkt_ts_enable);
lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_TX_TIMESTAMP_EN, pkt_ts_enable);
- if (ptp_priv->hwts_tx_type == HWTSTAMP_TX_ONESTEP_SYNC)
+ tx_mod = lanphy_read_page_reg(ptp_priv->phydev, 5, PTP_TX_MOD);
+ if (ptp_priv->hwts_tx_type == HWTSTAMP_TX_ONESTEP_SYNC) {
lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_TX_MOD,
- PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_);
+ tx_mod | PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_);
+ } else if (ptp_priv->hwts_tx_type == HWTSTAMP_TX_ON) {
+ lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_TX_MOD,
+ tx_mod & ~PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_);
+ }
if (config->rx_filter != HWTSTAMP_FILTER_NONE)
lan8814_config_ts_intr(ptp_priv->phydev, true);
