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From ae9dcb91c6069e20b3b9505d79cbc89fd6e086f5 Mon Sep 17 00:00:00 2001 |
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From: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@intel.com> |
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Date: Wed, 11 Jan 2023 13:02:00 +0800 |
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Subject: net: stmmac: add aux timestamps fifo clearance wait |
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|
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From: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@intel.com> |
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|
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commit ae9dcb91c6069e20b3b9505d79cbc89fd6e086f5 upstream. |
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|
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Add timeout polling wait for auxiliary timestamps snapshot FIFO clear bit |
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(ATSFC) to clear. This is to ensure no residue fifo value is being read |
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erroneously. |
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|
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Fixes: f4da56529da6 ("net: stmmac: Add support for external trigger timestamping") |
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Cc: <stable@vger.kernel.org> # 5.10.x |
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Signed-off-by: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@intel.com> |
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Link: https://lore.kernel.org/r/20230111050200.2130-1-noor.azura.ahmad.tarmizi@intel.com |
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Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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--- |
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drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 5 ++++- |
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1 file changed, 4 insertions(+), 1 deletion(-) |
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|
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--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c |
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+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c |
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@@ -229,7 +229,10 @@ static int stmmac_enable(struct ptp_cloc |
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} |
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writel(acr_value, ptpaddr + PTP_ACR); |
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mutex_unlock(&priv->aux_ts_lock); |
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- ret = 0; |
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+ /* wait for auxts fifo clear to finish */ |
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+ ret = readl_poll_timeout(ptpaddr + PTP_ACR, acr_value, |
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+ !(acr_value & PTP_ACR_ATSFC), |
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+ 10, 10000); |
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break; |
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default: |
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