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ARM: iMX5: Don't enable DPLL if it already enabled

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If the DPLL is already enabled, don't try to enable it again.
Since write to the DPLL control register will make the DPLL
reset and which will cause some issues when some child module
are sourced from this DPLL.

Signed-off-by: Jason Liu <jason.hui@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jason Liu 2011-08-05 23:34:32 +08:00 committed by Sascha Hauer
parent 2012d9ca2a
commit e1b96ada65
1 changed files with 5 additions and 1 deletions
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6
arch/arm/mach-mx5/clock-mx51-mx53.c
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@ -271,7 +271,11 @@ static int _clk_pll_enable(struct clk *clk)
int i = 0;
pllbase = _get_pll_base(clk);
reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) | MXC_PLL_DP_CTL_UPEN;
reg = __raw_readl(pllbase + MXC_PLL_DP_CTL);
if (reg & MXC_PLL_DP_CTL_UPEN)
return 0;
reg |= MXC_PLL_DP_CTL_UPEN;
__raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
/* Wait for lock */