ARM: atmel: spl: make initialization more stable
We need to make sure the main clock ready field in MCFR is set
after switch to main crystal oscillator.
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/arm/cpu/at91-common/spl.c b/arch/arm/cpu/at91-common/spl.c
index 674a470..57fb041 100644
--- a/arch/arm/cpu/at91-common/spl.c
+++ b/arch/arm/cpu/at91-common/spl.c
@@ -50,6 +50,10 @@
while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
;
+ /* Wait until MAINRDY field is set to make sure main clock is stable */
+ while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
+ ;
+
tmp = readl(&pmc->mor);
tmp &= ~AT91_PMC_MOR_MOSCRCEN;
tmp &= ~AT91_PMC_MOR_KEY(0xff);