linux-kernel - Re: [PATCH v4 2/5] clk: qcom: clk-alpha-pll: modularize alpha_pll_trion_set

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Message-ID: <YA78gO7xEoZSb+Wy@builder.lan>
Date:   Mon, 25 Jan 2021 11:14:40 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] clk: qcom: clk-alpha-pll: modularize
 alpha_pll_trion_set_rate()

On Sun 17 Jan 22:43 CST 2021, Vinod Koul wrote:

> Trion 5LPE set rate uses code similar to alpha_pll_trion_set_rate() but
> with different registers. Modularize these by moving out latch and latch
> ack bits so that we can reuse the function.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/clk/qcom/clk-alpha-pll.c | 18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index f7721088494c..a30ea7b09224 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -1471,8 +1471,8 @@ static int alpha_pll_lucid_prepare(struct clk_hw *hw)
>  	return __alpha_pll_trion_prepare(hw, LUCID_PCAL_DONE);
>  }
>  
> -static int alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
> -				    unsigned long prate)
> +static int __alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
> +				      unsigned long prate, u32 latch_bit, u32 latch_ack)
>  {
>  	struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
>  	unsigned long rrate;
> @@ -1490,22 +1490,20 @@ static int alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
>  	regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
>  
>  	/* Latch the PLL input */
> -	ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll),
> -				 PLL_UPDATE, PLL_UPDATE);
> +	ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), latch_bit, latch_bit);
>  	if (ret)
>  		return ret;
>  
>  	/* Wait for 2 reference cycles before checking the ACK bit. */
>  	udelay(1);
>  	regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val);
> -	if (!(val & ALPHA_PLL_ACK_LATCH)) {
> +	if (!(val & latch_ack)) {
>  		pr_err("Lucid PLL latch failed. Output may be unstable!\n");
>  		return -EINVAL;
>  	}
>  
>  	/* Return the latch input to 0 */
> -	ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll),
> -				 PLL_UPDATE, 0);
> +	ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), latch_bit, 0);
>  	if (ret)
>  		return ret;
>  
> @@ -1520,6 +1518,12 @@ static int alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
>  	return 0;
>  }
>  
> +static int alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
> +				    unsigned long prate)
> +{
> +	return __alpha_pll_trion_set_rate(hw, rate, prate, PLL_UPDATE, ALPHA_PLL_ACK_LATCH);
> +}
> +
>  const struct clk_ops clk_alpha_pll_trion_ops = {
>  	.prepare = alpha_pll_trion_prepare,
>  	.enable = clk_trion_pll_enable,
> -- 
> 2.26.2
>