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net: stmmac: add aux timestamps fifo clearance wait
commit ae9dcb9 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: f4da565 ("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>
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