linux-kernel - [PATCH net 1/1] net: stmmac: add aux timestamps fifo clearance wait

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Message-Id: <20230109151546.26247-1-noor.azura.ahmad.tarmizi@intel.com>
Date:   Mon,  9 Jan 2023 23:15:46 +0800
From:   Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@...el.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Noor Azura Ahmad Tarmizi 
        <noor.azura.ahmad.tarmizi@...ux.intel.com>,
        Tan Tee Min <tee.min.tan@...el.com>,
        Looi Hong Aun <hong.aun.looi@...el.com>,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
        Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@...el.com>,
        stable@...r.kernel.org
Subject: [PATCH net 1/1] net: stmmac: add aux timestamps fifo clearance wait

Add timeout polling wait for auxiliary timestamps snapshot FIFO clear bit
(ATSFC) to clear. This is to ensure no residue fifo value is being read
erroneously.

Cc: <stable@...r.kernel.org> # 5.10.x
Signed-off-by: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
index fc06ddeac0d5..b4388ca8d211 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
@@ -210,7 +210,10 @@ static int stmmac_enable(struct ptp_clock_info *ptp,
 		}
 		writel(acr_value, ptpaddr + PTP_ACR);
 		mutex_unlock(&priv->aux_ts_lock);
-		ret = 0;
+		/* wait for auxts fifo clear to finish */
+		ret = readl_poll_timeout(ptpaddr + PTP_ACR, acr_value,
+					 !(acr_value & PTP_ACR_ATSFC),
+					 10, 10000);
 		break;
 
 	default:
-- 
2.17.1