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Date:   Fri, 24 Jan 2020 10:32:38 -0800
From:   Bjorn Andersson <bjorn.andersson@linaro.org>
To:     Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Cc:     agross@kernel.org, mturquette@baylibre.com, sboyd@kernel.org,
        robh+dt@kernel.org, mark.rutland@arm.com, vinod.koul@linaro.org,
        psodagud@codeaurora.org, tsoni@codeaurora.org,
        jshriram@codeaurora.org, tdas@codeaurora.org,
        linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/7] clk: qcom: clk-alpha-pll: Refactor and cleanup trion
 PLL
Message-ID: <20200124183238.GV1908628@ripper>
References: <1579217994-22219-1-git-send-email-vnkgutta@codeaurora.org>
 <1579217994-22219-4-git-send-email-vnkgutta@codeaurora.org>
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On Thu 16 Jan 15:39 PST 2020, Venkata Narendra Kumar Gutta wrote:

> From: Taniya Das <tdas@codeaurora.org>
> 
> The PLL run and standby modes are similar across the PLLs, thus rename
> and refactor the code accordingly.
> 
> Remove duplicate function for calculating the round rate of PLL and also
> update the trion pll ops to use the common function.
> 

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

> Signed-off-by: Taniya Das <tdas@codeaurora.org>
> Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
> ---
>  drivers/clk/qcom/clk-alpha-pll.c | 71 +++++++++++++---------------------------
>  1 file changed, 22 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index 7c2936d..1b073b2 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -134,15 +134,10 @@
>  #define PLL_HUAYRA_N_MASK		0xff
>  #define PLL_HUAYRA_ALPHA_WIDTH		16
>  
> -#define FABIA_OPMODE_STANDBY	0x0
> -#define FABIA_OPMODE_RUN	0x1
> -
> -#define FABIA_PLL_OUT_MASK	0x7
> -#define FABIA_PLL_RATE_MARGIN	500
> -
> -#define TRION_PLL_STANDBY	0x0
> -#define TRION_PLL_RUN		0x1
> -#define TRION_PLL_OUT_MASK	0x7
> +#define PLL_STANDBY		0x0
> +#define PLL_RUN			0x1
> +#define PLL_OUT_MASK		0x7
> +#define PLL_RATE_MARGIN		500
>  
>  #define pll_alpha_width(p)					\
>  		((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ?	\
> @@ -765,7 +760,7 @@ static int trion_pll_is_enabled(struct clk_alpha_pll *pll,
>  	if (ret)
>  		return 0;
>  
> -	return ((opmode_regval & TRION_PLL_RUN) && (mode_regval & PLL_OUTCTRL));
> +	return ((opmode_regval & PLL_RUN) && (mode_regval & PLL_OUTCTRL));
>  }
>  
>  static int clk_trion_pll_is_enabled(struct clk_hw *hw)
> @@ -795,7 +790,7 @@ static int clk_trion_pll_enable(struct clk_hw *hw)
>  	}
>  
>  	/* Set operation mode to RUN */
> -	regmap_write(regmap, PLL_OPMODE(pll), TRION_PLL_RUN);
> +	regmap_write(regmap, PLL_OPMODE(pll), PLL_RUN);
>  
>  	ret = wait_for_pll_enable_lock(pll);
>  	if (ret)
> @@ -803,7 +798,7 @@ static int clk_trion_pll_enable(struct clk_hw *hw)
>  
>  	/* Enable the PLL outputs */
>  	ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
> -				 TRION_PLL_OUT_MASK, TRION_PLL_OUT_MASK);
> +				 PLL_OUT_MASK, PLL_OUT_MASK);
>  	if (ret)
>  		return ret;
>  
> @@ -836,12 +831,12 @@ static void clk_trion_pll_disable(struct clk_hw *hw)
>  
>  	/* Disable the PLL outputs */
>  	ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
> -				 TRION_PLL_OUT_MASK, 0);
> +				 PLL_OUT_MASK, 0);
>  	if (ret)
>  		return;
>  
>  	/* Place the PLL mode in STANDBY */
> -	regmap_write(regmap, PLL_OPMODE(pll), TRION_PLL_STANDBY);
> +	regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
>  	regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
>  }
>  
> @@ -849,33 +844,12 @@ static void clk_trion_pll_disable(struct clk_hw *hw)
>  clk_trion_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
>  {
>  	struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
> -	struct regmap *regmap = pll->clkr.regmap;
> -	u32 l, frac;
> -	u64 prate = parent_rate;
> -
> -	regmap_read(regmap, PLL_L_VAL(pll), &l);
> -	regmap_read(regmap, PLL_ALPHA_VAL(pll), &frac);
> -
> -	return alpha_pll_calc_rate(prate, l, frac, ALPHA_REG_16BIT_WIDTH);
> -}
> -
> -static long clk_trion_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> -				     unsigned long *prate)
> -{
> -	struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
> -	unsigned long min_freq, max_freq;
> -	u32 l;
> -	u64 a;
> -
> -	rate = alpha_pll_round_rate(rate, *prate,
> -				    &l, &a, ALPHA_REG_16BIT_WIDTH);
> -	if (!pll->vco_table || alpha_pll_find_vco(pll, rate))
> -		return rate;
> +	u32 l, frac, alpha_width = pll_alpha_width(pll);
>  
> -	min_freq = pll->vco_table[0].min_freq;
> -	max_freq = pll->vco_table[pll->num_vco - 1].max_freq;
> +	regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l);
> +	regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL(pll), &frac);
>  
> -	return clamp(rate, min_freq, max_freq);
> +	return alpha_pll_calc_rate(parent_rate, l, frac, alpha_width);
>  }
>  
>  const struct clk_ops clk_alpha_pll_fixed_ops = {
> @@ -921,7 +895,7 @@ static long clk_trion_pll_round_rate(struct clk_hw *hw, unsigned long rate,
>  	.disable = clk_trion_pll_disable,
>  	.is_enabled = clk_trion_pll_is_enabled,
>  	.recalc_rate = clk_trion_pll_recalc_rate,
> -	.round_rate = clk_trion_pll_round_rate,
> +	.round_rate = clk_alpha_pll_round_rate,
>  };
>  EXPORT_SYMBOL_GPL(clk_trion_fixed_pll_ops);
>  
> @@ -1088,14 +1062,14 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw)
>  		return ret;
>  
>  	/* Skip If PLL is already running */
> -	if ((opmode_val & FABIA_OPMODE_RUN) && (val & PLL_OUTCTRL))
> +	if ((opmode_val & PLL_RUN) && (val & PLL_OUTCTRL))
>  		return 0;
>  
>  	ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
>  	if (ret)
>  		return ret;
>  
> -	ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY);
> +	ret = regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
>  	if (ret)
>  		return ret;
>  
> @@ -1104,7 +1078,7 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw)
>  	if (ret)
>  		return ret;
>  
> -	ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_RUN);
> +	ret = regmap_write(regmap, PLL_OPMODE(pll), PLL_RUN);
>  	if (ret)
>  		return ret;
>  
> @@ -1113,7 +1087,7 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw)
>  		return ret;
>  
>  	ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
> -				 FABIA_PLL_OUT_MASK, FABIA_PLL_OUT_MASK);
> +				 PLL_OUT_MASK, PLL_OUT_MASK);
>  	if (ret)
>  		return ret;
>  
> @@ -1143,13 +1117,12 @@ static void alpha_pll_fabia_disable(struct clk_hw *hw)
>  		return;
>  
>  	/* Disable main outputs */
> -	ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), FABIA_PLL_OUT_MASK,
> -				 0);
> +	ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), PLL_OUT_MASK, 0);
>  	if (ret)
>  		return;
>  
>  	/* Place the PLL in STANDBY */
> -	regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY);
> +	regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
>  }
>  
>  static unsigned long alpha_pll_fabia_recalc_rate(struct clk_hw *hw,
> @@ -1178,7 +1151,7 @@ static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate,
>  	 * Due to limited number of bits for fractional rate programming, the
>  	 * rounded up rate could be marginally higher than the requested rate.
>  	 */
> -	if (rrate > (rate + FABIA_PLL_RATE_MARGIN) || rrate < rate) {
> +	if (rrate > (rate + PLL_RATE_MARGIN) || rrate < rate) {
>  		pr_err("Call set rate on the PLL with rounded rates!\n");
>  		return -EINVAL;
>  	}
> @@ -1227,7 +1200,7 @@ static int alpha_pll_fabia_prepare(struct clk_hw *hw)
>  	 * Due to a limited number of bits for fractional rate programming, the
>  	 * rounded up rate could be marginally higher than the requested rate.
>  	 */
> -	if (rrate > (cal_freq + FABIA_PLL_RATE_MARGIN) || rrate < cal_freq)
> +	if (rrate > (cal_freq + PLL_RATE_MARGIN) || rrate < cal_freq)
>  		return -EINVAL;
>  
>  	/* Setup PLL for calibration frequency */
> -- 
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