ice: Check for PTP HW lock more frequently

It was observed that PTP HW semaphore can be held for ~50 ms in worst
case.
SW should wait longer and check more frequently if the HW lock is held.

Signed-off-by: Karol Kolacinski <[email protected]>
Tested-by: Gurucharan G <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[email protected]>

Author: kolacinskikarol

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

@@ -2963,16 +2963,18 @@ bool ice_ptp_lock(struct ice_hw *hw)
 	u32 hw_lock;
 	int i;
 
-#define MAX_TRIES 5
+#define MAX_TRIES 15
 
 	for (i = 0; i < MAX_TRIES; i++) {
 		hw_lock = rd32(hw, PFTSYN_SEM + (PFTSYN_SEM_BYTES * hw->pf_id));
 		hw_lock = hw_lock & PFTSYN_SEM_BUSY_M;
-		if (!hw_lock)
-			break;
+		if (hw_lock) {
+			/* Somebody is holding the lock */
+			usleep_range(5000, 6000);
+			continue;
+		}
 
-		/* Somebody is holding the lock */
-		usleep_range(10000, 20000);
+		break;
 	}
 
 	return !hw_lock;