diff --git a/arch/mips/txx9/rbtx4939/setup.c b/arch/mips/txx9/rbtx4939/setup.c
index c033ffe..b0c241e 100644
--- a/arch/mips/txx9/rbtx4939/setup.c
+++ b/arch/mips/txx9/rbtx4939/setup.c
@@ -512,10 +512,10 @@
 	rbtx4939_ebusc_setup();
 	/* always enable ATA0 */
 	txx9_set64(&tx4939_ccfgptr->pcfg, TX4939_PCFG_ATA0MODE);
-	rbtx4939_update_ioc_pen();
 	if (txx9_master_clock == 0)
 		txx9_master_clock = 20000000;
 	tx4939_setup();
+	rbtx4939_update_ioc_pen();
 #ifdef HAVE_RBTX4939_IOSWAB
 	ioswabw = rbtx4939_ioswabw;
 	__mem_ioswabw = rbtx4939_mem_ioswabw;