diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-davinci/clock.c | 15 | ||||
| -rw-r--r-- | arch/arm/mach-davinci/clock.h | 15 |
2 files changed, 18 insertions, 12 deletions
diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c index baece65cb9c0..0fa68c558320 100644 --- a/arch/arm/mach-davinci/clock.c +++ b/arch/arm/mach-davinci/clock.c @@ -376,7 +376,7 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv, locktime = ((2000 * prediv) / 100); prediv = (prediv - 1) | PLLDIV_EN; } else { - locktime = 20; + locktime = PLL_LOCK_TIME; } if (postdiv) postdiv = (postdiv - 1) | PLLDIV_EN; @@ -389,12 +389,7 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv, ctrl &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN); __raw_writel(ctrl, pll->base + PLLCTL); - /* - * Wait for 4 OSCIN/CLKIN cycles to ensure that the PLLC has switched - * to bypass mode. Delay of 1us ensures we are good for all > 4MHz - * OSCIN/CLKIN inputs. Typically the input is ~25MHz. - */ - udelay(1); + udelay(PLL_BYPASS_TIME); /* Reset and enable PLL */ ctrl &= ~(PLLCTL_PLLRST | PLLCTL_PLLDIS); @@ -408,11 +403,7 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv, if (pll->flags & PLL_HAS_POSTDIV) __raw_writel(postdiv, pll->base + POSTDIV); - /* - * Wait for PLL to reset properly, OMAP-L138 datasheet says - * 'min' time = 125ns - */ - udelay(1); + udelay(PLL_RESET_TIME); /* Bring PLL out of reset */ ctrl |= PLLCTL_PLLRST; diff --git a/arch/arm/mach-davinci/clock.h b/arch/arm/mach-davinci/clock.h index c92d77a3008d..eca4d9972225 100644 --- a/arch/arm/mach-davinci/clock.h +++ b/arch/arm/mach-davinci/clock.h @@ -53,6 +53,21 @@ #define PLLDIV_EN BIT(15) #define PLLDIV_RATIO_MASK 0x1f +/* + * OMAP-L138 system reference guide recommends a wait for 4 OSCIN/CLKIN + * cycles to ensure that the PLLC has switched to bypass mode. Delay of 1us + * ensures we are good for all > 4MHz OSCIN/CLKIN inputs. Typically the input + * is ~25MHz. Units are micro seconds. + */ +#define PLL_BYPASS_TIME 1 +/* From OMAP-L138 datasheet table 6-4. Units are micro seconds */ +#define PLL_RESET_TIME 1 +/* + * From OMAP-L138 datasheet table 6-4; assuming prediv = 1, sqrt(pllm) = 4 + * Units are micro seconds. + */ +#define PLL_LOCK_TIME 20 + struct pll_data { u32 phys_base; void __iomem *base; |