From: Karol Kolacinski <karol.kolacinski@intel.com>
Date: Mon, 3 Oct 2022 09:55:18 +0000 (+0200)
Subject: ice: Check for PTP HW lock more frequently
X-Git-Tag: v6.6.7~3913^2~125^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a711a3288cc69af93148db343d3bfaf5a177a6b0;p=platform%2Fkernel%2Flinux-starfive.git

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 <karol.kolacinski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp_hw.c b/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
index 772b1f56..1f8dd50 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
+++ b/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;