linux-kernel - Re: [PATCH 2/2] clk: qcom: clk-hfpll: switch to .determine

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Message-ID: <63eabd3e.df0a0220.f8fb1.b4f3@mx.google.com>
Date:   Sun, 12 Feb 2023 10:09:45 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Luca Weiss <luca@...tu.xyz>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] clk: qcom: clk-hfpll: switch to .determine_rate

On Sun, Feb 12, 2023 at 03:11:09PM +0100, Luca Weiss wrote:
> .determine_rate is meant to replace .round_rate. The former comes with a
> benefit which is especially relevant on 32-bit systems: since
> .determine_rate uses an "unsigned long" (compared to a "signed long"
> which is used by .round_rate) the maximum value on 32-bit systems
> increases from 2^31 (or approx. 2.14GHz) to 2^32 (or approx. 4.29GHz).
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>

Tested-by: Christian Marangi <ansuelsmth@...il.com>

> ---
>  drivers/clk/qcom/clk-hfpll.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/clk/qcom/clk-hfpll.c b/drivers/clk/qcom/clk-hfpll.c
> index 7dd17c184b69..86f728dc69e5 100644
> --- a/drivers/clk/qcom/clk-hfpll.c
> +++ b/drivers/clk/qcom/clk-hfpll.c
> @@ -128,20 +128,20 @@ static void clk_hfpll_disable(struct clk_hw *hw)
>  	spin_unlock_irqrestore(&h->lock, flags);
>  }
>  
> -static long clk_hfpll_round_rate(struct clk_hw *hw, unsigned long rate,
> -				 unsigned long *parent_rate)
> +static int clk_hfpll_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
>  {
>  	struct clk_hfpll *h = to_clk_hfpll(hw);
>  	struct hfpll_data const *hd = h->d;
>  	unsigned long rrate;
>  
> -	rate = clamp(rate, hd->min_rate, hd->max_rate);
> +	req->rate = clamp(req->rate, hd->min_rate, hd->max_rate);
>  
> -	rrate = DIV_ROUND_UP(rate, *parent_rate) * *parent_rate;
> +	rrate = DIV_ROUND_UP(req->rate, req->best_parent_rate) * req->best_parent_rate;
>  	if (rrate > hd->max_rate)
> -		rrate -= *parent_rate;
> +		rrate -= req->best_parent_rate;
>  
> -	return rrate;
> +	req->rate = rrate;
> +	return 0;
>  }
>  
>  /*
> @@ -241,7 +241,7 @@ const struct clk_ops clk_ops_hfpll = {
>  	.enable = clk_hfpll_enable,
>  	.disable = clk_hfpll_disable,
>  	.is_enabled = hfpll_is_enabled,
> -	.round_rate = clk_hfpll_round_rate,
> +	.determine_rate = clk_hfpll_determine_rate,
>  	.set_rate = clk_hfpll_set_rate,
>  	.recalc_rate = clk_hfpll_recalc_rate,
>  	.init = clk_hfpll_init,
> 
> -- 
> 2.39.1
> 

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