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 ---
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);