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: Michael Neuling <mikey@neuling.org>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/powernv/opal-rtc.c b/arch/powerpc/platforms/powernv/opal-rtc.c
index 1b149c92fca1..f8868864f373 100644
--- a/arch/powerpc/platforms/powernv/opal-rtc.c
+++ b/arch/powerpc/platforms/powernv/opal-rtc.c
@@ -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)