Re: [PATCH] clk: allow to skip clk_core_req_round_rate_nolock()

[Jan Dakinevich]

Please take a look at this patch.

On 1/26/24 23:14, Jan Dakinevich wrote:
> Calling of clk_core_req_round_rate_nolock() can be time-consuming in a
> case of deep hierarchy with multiple dividers/parents. But if the clock
> already has exactly the same rate as desired, there is no need to
> determine how it could be rounded.
>
> Signed-off-by: Jan Dakinevich <jan.dakinevich@xxxxxxxxxxxxxxxxx>
> ---
>   drivers/clk/clk.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 2253c154a824..04f0ddced932 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2423,6 +2423,12 @@ static int clk_core_set_rate_nolock(struct clk_core *core,
>   	if (!core)
>   		return 0;
>   
> +	/* skip calculation of rounded rate if the clock already has exactly
> +	 * the same rate as desired
> +	 */
> +	if (req_rate == clk_core_get_rate_nolock(core))
> +		return 0;
> +
>   	rate = clk_core_req_round_rate_nolock(core, req_rate);
>   
>   	/* bail early if nothing to do */

--
Best regards
Jan Dakinevich