[PATCH v2] sunxi: clock: H6/H616: Fix PLL clock factor encodings

[Andre Przywara]

On Wed,  5 May 2021 13:53:05 +0100
Andre Przywara <andre.przywara at arm.com> wrote:

Hi,

> Most clock factors and dividers in the H6 PLLs use a "+1 encoding",
> which we were missing on two occasions.

can someone please confirm that I didn't mess this up?

Cheers,
Andre

> 
> This fixes the MMC clock setup on the H6, which could be slightly off due
> to the wrong parent frequency:
> mmc 2 set mod-clk req 52000000 parent 1176000000 n 2 m 12 rate 49000000
> 
> Also the CPU frequency was a tad too high before.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
> Changelog v1 .. v2:
> - Also fix PLL5 factor calculation (video, currently unused)
> - Also fix PLL1 factor calculation (CPU clock)
> 
>  arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h | 4 ++--
>  arch/arm/mach-sunxi/clock_sun50i_h6.c             | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
> index 62abfc4ef6b..2e076cf594d 100644
> --- a/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
> +++ b/arch/arm/include/asm/arch-sunxi/clock_sun50i_h6.h
> @@ -233,14 +233,14 @@ struct sunxi_ccm_reg {
>  #define CCM_PLL1_OUT_EN			BIT(27)
>  #define CCM_PLL1_CLOCK_TIME_2		(2 << 24)
>  #define CCM_PLL1_CTRL_P(p)		((p) << 16)
> -#define CCM_PLL1_CTRL_N(n)		((n) << 8)
> +#define CCM_PLL1_CTRL_N(n)		(((n) - 1) << 8)
>  
>  /* pll5 bit field */
>  #define CCM_PLL5_CTRL_EN		BIT(31)
>  #define CCM_PLL5_LOCK_EN		BIT(29)
>  #define CCM_PLL5_LOCK			BIT(28)
>  #define CCM_PLL5_OUT_EN			BIT(27)
> -#define CCM_PLL5_CTRL_N(n)		((n) << 8)
> +#define CCM_PLL5_CTRL_N(n)		(((n) - 1) << 8)
>  #define CCM_PLL5_CTRL_DIV1(div1)	((div1) << 0)
>  #define CCM_PLL5_CTRL_DIV2(div0)	((div0) << 1)
>  
> diff --git a/arch/arm/mach-sunxi/clock_sun50i_h6.c b/arch/arm/mach-sunxi/clock_sun50i_h6.c
> index 492fc4a3fca..a947463e0a5 100644
> --- a/arch/arm/mach-sunxi/clock_sun50i_h6.c
> +++ b/arch/arm/mach-sunxi/clock_sun50i_h6.c
> @@ -94,7 +94,7 @@ unsigned int clock_get_pll6(void)
>  	int m = IS_ENABLED(CONFIG_MACH_SUN50I_H6) ? 4 : 2;
>  
>  	uint32_t rval = readl(&ccm->pll6_cfg);
> -	int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT);
> +	int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT) + 1;
>  	int div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
>  			CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
>  	int div2 = ((rval & CCM_PLL6_CTRL_DIV2_MASK) >>