net: fec: ptp: avoid register access when ipg clock is disabled
When accessing the timecounter register on an i.MX8MQ the kernel hangs. This is only the case when the interface is down. This can be reproduced by reading with 'phc_ctrl eth0 get'. Like described in the change in 91c0d987 the igp clock is disabled when the interface is down and leads to a system hang. So we check if the ptp clock status before reading the timecounter register. Signed-off-by:Heiko Thiery <heiko.thiery@gmail.com> Acked-by:
Richard Cochran <richardcochran@gmail.com> Link: https://lore.kernel.org/r/20210225211514.9115-1-heiko.thiery@gmail.com Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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