[PATCH] clk: at91: generated: consider range when calculating best rate
Stephen Boyd
sboyd at kernel.org
Thu Apr 21 18:12:14 PDT 2022
Quoting Codrin Ciubotariu (2022-04-13 00:13:18)
> clk_generated_best_diff() helps in finding the parent and the divisor to
> compute a rate closest to the required one. However, it doesn't take into
> account the request's range for the new rate. Make sure the new rate
> is within the required range.
>
> Fixes: 8a8f4bf0c480 ("clk: at91: clk-generated: create function to find best_diff")
> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu at microchip.com>
> ---
Is this fixing anything real or it's just a thing that you noticed and
sent a patch to fix?
> drivers/clk/at91/clk-generated.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
> index 23cc8297ec4c..d429ba52a719 100644
> --- a/drivers/clk/at91/clk-generated.c
> +++ b/drivers/clk/at91/clk-generated.c
> @@ -117,6 +117,10 @@ static void clk_generated_best_diff(struct clk_rate_request *req,
> tmp_rate = parent_rate;
> else
> tmp_rate = parent_rate / div;
> +
> + if (tmp_rate < req->min_rate || tmp_rate > req->max_rate)
> + return;
> +
> tmp_diff = abs(req->rate - tmp_rate);
>
> if (*best_diff < 0 || *best_diff >= tmp_diff) {
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