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>

diff --git a/arch/powerpc/platforms/powernv/opal-rtc.c b/arch/powerpc/platforms/powernv/opal-rtc.c
index 1b149c92fca166429e59dc72b55bcbfe7393d930..f8868864f373ed5eecba333a5b1a2b83e38e0ec6 100644 (file)
--- 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)