From 41447fb2cf2fbeb448b1d606cb13ca1ae84f9737 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Fri, 24 Jan 2014 12:46:09 -0700 Subject: [PATCH] ARM: tegra: enable PLLX only once it's been fully configured This programming sequence is correct per Jimmy Zhang, and makes sense too! Signed-off-by: Stephen Warren Tested-by: Thierry Reding Signed-off-by: Tom Warren --- arch/arm/cpu/arm720t/tegra-common/cpu.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/arm/cpu/arm720t/tegra-common/cpu.c b/arch/arm/cpu/arm720t/tegra-common/cpu.c index 03f67b163c..322ce10d6f 100644 --- a/arch/arm/cpu/arm720t/tegra-common/cpu.c +++ b/arch/arm/cpu/arm720t/tegra-common/cpu.c @@ -144,18 +144,23 @@ int pllx_set_rate(struct clk_pll_simple *pll , u32 divn, u32 divm, reg |= (1 << PLL_DCCON_SHIFT); writel(reg, &pll->pll_misc); - /* Enable PLLX */ - reg = readl(&pll->pll_base); - reg |= PLL_ENABLE_MASK; - /* Disable BYPASS */ + reg = readl(&pll->pll_base); reg &= ~PLL_BYPASS_MASK; writel(reg, &pll->pll_base); + debug("pllx_set_rate: base = 0x%08X\n", reg); /* Set lock_enable to PLLX_MISC */ reg = readl(&pll->pll_misc); reg |= PLL_LOCK_ENABLE_MASK; writel(reg, &pll->pll_misc); + debug("pllx_set_rate: misc = 0x%08X\n", reg); + + /* Enable PLLX last, once it's all configured */ + reg = readl(&pll->pll_base); + reg |= PLL_ENABLE_MASK; + writel(reg, &pll->pll_base); + debug("pllx_set_rate: base final = 0x%08X\n", reg); return 0; } -- 2.30.2