[U-Boot] [PATCH 4/4 v4] Preventing needless switching on and off PLL bypass mode, allowing allow single-stepping through the SPL

[Marek Vasut <marek.vasut@gmail.com>]

> From: Robert Delien <robert@delien.nl>
> 
> This patch prevents the needless switching on and off of PLL bypass
> mode. With this patch in place, single-stepping through the SPL is
> now possible.

Why did FSL have it in the bootlets though? Fabio, can you explain?

M

> 
> Signed-off-by: Robert Delien <robert@delien.nl>
> ---
>  arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c   |    4 ----
>  arch/arm/cpu/arm926ejs/mx28/spl_power_init.c |   24
> ------------------------ 2 files changed, 0 insertions(+), 28 deletions(-)
> 
> diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
> b/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c index f2fab7c..cf4361c 100644
> --- a/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
> +++ b/arch/arm/cpu/arm926ejs/mx28/spl_mem_init.c
> @@ -121,10 +121,6 @@ void mx28_mem_setup_cpu_and_hbus(void)
>  	writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
>  		(uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
> 
> -	/* Set CPU bypass */
> -	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
> -		&clkctrl_regs->hw_clkctrl_clkseq_set);
> -
>  	/* HBUS = 151MHz */
>  	writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
>  	writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
> diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
> b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c index 380b120..5e21a1e
> 100644
> --- a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
> +++ b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
> @@ -30,28 +30,6 @@
> 
>  #include "mx28_init.h"
> 
> -void mx28_power_clock2xtal(void)
> -{
> -	struct mx28_clkctrl_regs *clkctrl_regs =
> -		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
> -
> -	/* Set XTAL as CPU reference clock */
> -	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
> -		&clkctrl_regs->hw_clkctrl_clkseq_set);
> -}
> -
> -void mx28_power_clock2pll(void)
> -{
> -	struct mx28_clkctrl_regs *clkctrl_regs =
> -		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
> -
> -	writel(CLKCTRL_PLL0CTRL0_POWER,
> -		&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
> -	early_delay(100);
> -	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
> -		&clkctrl_regs->hw_clkctrl_clkseq_clr);
> -}
> -
>  void mx28_power_clear_auto_restart(void)
>  {
>  	struct mx28_rtc_regs *rtc_regs =
> @@ -606,7 +584,6 @@ void mx28_power_configure_power_source(void)
>  	mx28_src_power_init();
> 
>  	mx28_5v_boot();
> -	mx28_power_clock2pll();
> 
>  	mx28_init_batt_bo();
>  	mx28_switch_vddd_to_dcdc_source();
> @@ -880,7 +857,6 @@ void mx28_power_init(void)
>  	struct mx28_power_regs *power_regs =
>  		(struct mx28_power_regs *)MXS_POWER_BASE;
> 
> -	mx28_power_clock2xtal();
>  	mx28_power_clear_auto_restart();
>  	mx28_power_set_linreg();
>  	mx28_power_setup_5v_detect();