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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.

Fixes: f4da56529d ("net: stmmac: Add support for external trigger timestamping")
Cc: <stable@vger.kernel.org> # 5.10.x
Signed-off-by: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@intel.com>
Link: https://lore.kernel.org/r/20230111050200.2130-1-noor.azura.ahmad.tarmizi@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Noor Azura Ahmad Tarmizi 2023-01-11 13:02:00 +08:00 committed by Jakub Kicinski
parent eb25df8828
commit ae9dcb91c6
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
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@ -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: