ice: Add PHY OFFSET_READY register clearing

Add a possibility to mark all transmitted/received timestamps as invalid
by clearing PHY OFFSET_READY registers.
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20240528-next-2024-05-28-ptp-refactors-v1-4-c082739bb6f6@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/intel/ice/ice_ptp.c

@@ -1933,11 +1933,14 @@ ice_ptp_settime64(struct ptp_clock_info *info, const struct timespec64 *ts)
 	struct ice_hw *hw = &pf->hw;
 	int err;
 
-	/* For Vernier mode, we need to recalibrate after new settime
-	 * Start with disabling timestamp block
+	/* For Vernier mode on E82X, we need to recalibrate after new settime.
+	 * Start with marking timestamps as invalid.
 	 */
-	if (pf->ptp.port.link_up)
-		ice_ptp_port_phy_stop(&pf->ptp.port);
+	if (hw->ptp.phy_model == ICE_PHY_E82X) {
+		err = ice_ptp_clear_phy_offset_ready_e82x(hw);
+		if (err)
+			dev_warn(ice_pf_to_dev(pf), "Failed to mark timestamps as invalid before settime\n");
+	}
 
 	if (!ice_ptp_lock(hw)) {
 		err = -EBUSY;

drivers/net/ethernet/intel/ice/ice_ptp_hw.c

@@ -2409,6 +2409,40 @@ int ice_phy_cfg_rx_offset_e82x(struct ice_hw *hw, u8 port)
 	return 0;
 }
 
+/**
+ * ice_ptp_clear_phy_offset_ready_e82x - Clear PHY TX_/RX_OFFSET_READY registers
+ * @hw: pointer to the HW struct
+ *
+ * Clear PHY TX_/RX_OFFSET_READY registers, effectively marking all transmitted
+ * and received timestamps as invalid.
+ *
+ * Return: 0 on success, other error codes when failed to write to PHY
+ */
+int ice_ptp_clear_phy_offset_ready_e82x(struct ice_hw *hw)
+{
+	u8 port;
+
+	for (port = 0; port < hw->ptp.num_lports; port++) {
+		int err;
+
+		err = ice_write_phy_reg_e82x(hw, port, P_REG_TX_OR, 0);
+		if (err) {
+			dev_warn(ice_hw_to_dev(hw),
+				 "Failed to clear PHY TX_OFFSET_READY register\n");
+			return err;
+		}
+
+		err = ice_write_phy_reg_e82x(hw, port, P_REG_RX_OR, 0);
+		if (err) {
+			dev_warn(ice_hw_to_dev(hw),
+				 "Failed to clear PHY RX_OFFSET_READY register\n");
+			return err;
+		}
+	}
+
+	return 0;
+}
+
 /**
  * ice_read_phy_and_phc_time_e82x - Simultaneously capture PHC and PHY time
  * @hw: pointer to the HW struct

drivers/net/ethernet/intel/ice/ice_ptp_hw.h

@@ -208,6 +208,7 @@ int ice_ptp_init_time(struct ice_hw *hw, u64 time);
 int ice_ptp_write_incval(struct ice_hw *hw, u64 incval);
 int ice_ptp_write_incval_locked(struct ice_hw *hw, u64 incval);
 int ice_ptp_adj_clock(struct ice_hw *hw, s32 adj);
+int ice_ptp_clear_phy_offset_ready_e82x(struct ice_hw *hw);
 int ice_read_phy_tstamp(struct ice_hw *hw, u8 block, u8 idx, u64 *tstamp);
 int ice_clear_phy_tstamp(struct ice_hw *hw, u8 block, u8 idx);
 void ice_ptp_reset_ts_memory(struct ice_hw *hw);