[PATCH 5/9] ARM: i.MX8MM: correct unrecognized fracpll frequency

[Trent Piepho]

On Sun, Sep 5, 2021 at 6:52 AM Ahmad Fatoum <a.fatoum at pengutronix.de> wrote:
>
> Correct the value in imx8mm_fracpll_tbl to match the one expanded by
> MHZ(266) macro, rounding it down to MHz range only.

It's not really "correcting" the value, since the value is wrong.

24 MHz / 9 * 400 / 2^2 = 266666666.6 Hz

Maybe it would be better to say, "make the value in imx8mm_facpll_tbl
incorrect so it matches another incorrect value used elsewhere."

In which case, one has to wonder why it would not be better to use the
correct value everywhere?

>
> Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin at leica-geosystems.com>
> [afa: ported from U-Boot 6ac4d4480663]
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  drivers/ddr/imx8m/ddrphy_utils.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/ddr/imx8m/ddrphy_utils.c b/drivers/ddr/imx8m/ddrphy_utils.c
> index 9a4e1a22ee5e..6836e7d4b351 100644
> --- a/drivers/ddr/imx8m/ddrphy_utils.c
> +++ b/drivers/ddr/imx8m/ddrphy_utils.c
> @@ -198,7 +198,7 @@ static struct imx_int_pll_rate_table imx8mm_fracpll_tbl[] = {
>         { .rate = 600000000U,  .r1 = MDIV(300) | PDIV(3) | SDIV(2), .r2 = 0 },
>         { .rate = 594000000U,  .r1 = MDIV( 99) | PDIV(1) | SDIV(2), .r2 = 0 },
>         { .rate = 400000000U,  .r1 = MDIV(300) | PDIV(9) | SDIV(1), .r2 = 0 },
> -       { .rate = 266666667U,  .r1 = MDIV(400) | PDIV(9) | SDIV(2), .r2 = 0 },
> +       { .rate = 266000000U,  .r1 = MDIV(400) | PDIV(9) | SDIV(2), .r2 = 0 },
>         { .rate = 167000000U,  .r1 = MDIV(334) | PDIV(3) | SDIV(4), .r2 = 0 },
>         { .rate = 100000000U,  .r1 = MDIV(300) | PDIV(9) | SDIV(3), .r2 = 0 },
>  };