powerpc/powernv: Only delay opal_rtc_read() retry when necessary
Only delay opal_rtc_read() when busy and are going to retry. This has the advantage of possibly saving a massive 10ms off booting! Kudos to Stewart for noticing. Signed-off-by: NMichael Neuling <mikey@neuling.org> Reviewed-by: NStewart Smith <stewart@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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