[U-Boot] [PATCH 1/2] ARM: atmel: spl: make initialization more stable

[Bo Shen]

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 at atmel.com>
---

 arch/arm/cpu/at91-common/spl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/cpu/at91-common/spl.c b/arch/arm/cpu/at91-common/spl.c
index cbb5a52..1d7770e 100644
--- a/arch/arm/cpu/at91-common/spl.c
+++ b/arch/arm/cpu/at91-common/spl.c
@@ -50,6 +50,10 @@ static void switch_to_main_crystal_osc(void)
 	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);
-- 
2.1.0.24.g4109c28