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powerpc/powernv: Only delay opal_rtc_read() retry when necessary

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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: Michael Neuling <mikey@neuling.org>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Neuling 2015-12-18 21:46:04 +11:00 committed by Michael Ellerman
parent affddff69c
commit 57a9039052
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/platforms/powernv/opal-rtc.c
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@ -50,7 +50,7 @@ unsigned long __init opal_get_boot_time(void)
rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
else
else if (rc == OPAL_BUSY)
mdelay(10);
}
if (rc != OPAL_SUCCESS)