[U-Boot] [PATCH 1/1] sunxi: Fix pll1 clock calculation

Jagan Teki jagan at amarulasolutions.com
Fri Sep 6 18:21:43 UTC 2019


On Wed, Jul 31, 2019 at 6:46 PM Stefan Mavrodiev <stefan at olimex.com> wrote:
>
> clock_sun6i.c is used for sun6i, sun8i and sun50i SoC families.
> PLL1 clock sets the default system clock, defined as:
>   sun6i: 1008000000
>   sun8i: 1008000000
>   sun50i: 816000000
>
> With the current calculation, m = 2 and k = 3. Solving for n,
> this results 28. Solving back:
>   (24MHz * 28 * 3) / 2 = 1008MHz
>
> However if the requested clock is 816, n is 22.66 rounded
> to 22, which results:
>   (24MHz * 28 * 3) / 2 = 792MHz
>
> Changing k to 4 satisfies both system clocks:
>   (24E6 * 21 * 4) / 2 = 1008MHz
>   (24E6 * 17 * 4) / 2 = 816MHz
>
> Signed-off-by: Stefan Mavrodiev <stefan at olimex.com>
> ---

Acked-by: Jagan Teki <jagan at amarulasolutions.com>

Need to test on respective sun boards, any results?


More information about the U-Boot mailing list