1 files changed, 34 insertions, 8 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 980d3fe9f36b..c03db3d26c3d 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -464,7 +464,9 @@ ice_ptp_is_tx_tracker_up(struct ice_ptp_tx *tx)
  */
 void ice_ptp_req_tx_single_tstamp(struct ice_ptp_tx *tx, u8 idx)
 {
+	struct ice_e810_params *params;
 	struct ice_ptp_port *ptp_port;
+	unsigned long flags;
 	struct sk_buff *skb;
 	struct ice_pf *pf;
 
@@ -473,6 +475,7 @@ void ice_ptp_req_tx_single_tstamp(struct ice_ptp_tx *tx, u8 idx)
 
 	ptp_port = container_of(tx, struct ice_ptp_port, tx);
 	pf = ptp_port_to_pf(ptp_port);
+	params = &pf->hw.ptp.phy.e810;
 
 	/* Drop packets which have waited for more than 2 seconds */
 	if (time_is_before_jiffies(tx->tstamps[idx].start + 2 * HZ)) {
@@ -489,11 +492,17 @@ void ice_ptp_req_tx_single_tstamp(struct ice_ptp_tx *tx, u8 idx)
 
 	ice_trace(tx_tstamp_fw_req, tx->tstamps[idx].skb, idx);
 
+	spin_lock_irqsave(&params->atqbal_wq.lock, flags);
+
+	params->atqbal_flags |= ATQBAL_FLAGS_INTR_IN_PROGRESS;
+
 	/* Write TS index to read to the PF register so the FW can read it */
 	wr32(&pf->hw, REG_LL_PROXY_H,
 	     REG_LL_PROXY_H_TS_INTR_ENA | FIELD_PREP(REG_LL_PROXY_H_TS_IDX, idx) |
 	     REG_LL_PROXY_H_EXEC);
 	tx->last_ll_ts_idx_read = idx;
+
+	spin_unlock_irqrestore(&params->atqbal_wq.lock, flags);
 }
 
 /**
@@ -504,35 +513,52 @@ void ice_ptp_complete_tx_single_tstamp(struct ice_ptp_tx *tx)
 {
 	struct skb_shared_hwtstamps shhwtstamps = {};
 	u8 idx = tx->last_ll_ts_idx_read;
+	struct ice_e810_params *params;
 	struct ice_ptp_port *ptp_port;
 	u64 raw_tstamp, tstamp;
 	bool drop_ts = false;
 	struct sk_buff *skb;
+	unsigned long flags;
+	struct device *dev;
 	struct ice_pf *pf;
-	u32 val;
+	u32 reg_ll_high;
 
 	if (!tx->init || tx->last_ll_ts_idx_read < 0)
 		return;
 
 	ptp_port = container_of(tx, struct ice_ptp_port, tx);
 	pf = ptp_port_to_pf(ptp_port);
+	dev = ice_pf_to_dev(pf);
+	params = &pf->hw.ptp.phy.e810;
 
 	ice_trace(tx_tstamp_fw_done, tx->tstamps[idx].skb, idx);
 
-	val = rd32(&pf->hw, REG_LL_PROXY_H);
+	spin_lock_irqsave(&params->atqbal_wq.lock, flags);
+
+	if (!(params->atqbal_flags & ATQBAL_FLAGS_INTR_IN_PROGRESS))
+		dev_dbg(dev, "%s: low latency interrupt request not in progress?\n",
+			__func__);
+
+	/* Read the low 32 bit value */
+	raw_tstamp = rd32(&pf->hw, REG_LL_PROXY_L);
+	/* Read the status together with high TS part */
+	reg_ll_high = rd32(&pf->hw, REG_LL_PROXY_H);
+
+	/* Wake up threads waiting on low latency interface */
+	params->atqbal_flags &= ~ATQBAL_FLAGS_INTR_IN_PROGRESS;
+
+	wake_up_locked(&params->atqbal_wq);
+
+	spin_unlock_irqrestore(&params->atqbal_wq.lock, flags);
 
 	/* When the bit is cleared, the TS is ready in the register */
-	if (val & REG_LL_PROXY_H_EXEC) {
+	if (reg_ll_high & REG_LL_PROXY_H_EXEC) {
 		dev_err(ice_pf_to_dev(pf), "Failed to get the Tx tstamp - FW not ready");
 		return;
 	}
 
 	/* High 8 bit value of the TS is on the bits 16:23 */
-	raw_tstamp = FIELD_GET(REG_LL_PROXY_H_TS_HIGH, val);
-	raw_tstamp <<= 32;
-
-	/* Read the low 32 bit value */
-	raw_tstamp |= (u64)rd32(&pf->hw, REG_LL_PROXY_L);
+	raw_tstamp |= ((u64)FIELD_GET(REG_LL_PROXY_H_TS_HIGH, reg_ll_high)) << 32;
 
 	/* Devices using this interface always verify the timestamp differs
 	 * relative to the last cached timestamp value.