From: Noor Azura Ahmad Tarmizi noor.azura.ahmad.tarmizi@intel.com
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: f4da56529da6 ("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@int... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c @@ -219,7 +219,10 @@ static int stmmac_enable(struct ptp_cloc } 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;
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