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net: stmmac: add aux timestamps fifo clearance wait

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commit ae9dcb91c6069e20b3b9505d79cbc89fd6e086f5 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Noor Azura Ahmad Tarmizi
2023-01-11 13:02:00 +08:00
committed by Greg Kroah-Hartman
parent 44167b74a8
commit e81d82da61
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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@@ -229,7 +229,10 @@ 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: