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Subject: Re: [PATCH 3/3] clk: meson: clk-pll: drop hard-coded rates from pll
 tables
To:     Jerome Brunet <jbrunet@baylibre.com>
Cc:     linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org,
        linux-kernel@vger.kernel.org, Kevin Hilman <khilman@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>
References: <20180717095617.12240-1-jbrunet@baylibre.com>
 <20180717095617.12240-4-jbrunet@baylibre.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <d4e5e35a-39e0-fe27-8d27-387c5312ca32@baylibre.com>
Date:   Thu, 19 Jul 2018 10:44:07 +0200
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On 17/07/2018 11:56, Jerome Brunet wrote:
> Putting hard-coded rates inside the parameter tables assumes that
> the parent is known and will never change. That's a big assumption
> we should not make.
> 
> We have everything we need to recalculate the output rate using
> the parent rate and the rest of the parameters. Let's do so and
> drop the rates from the tables.
> 
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
> ---
>  drivers/clk/meson/axg.c     |  73 +++++++++++++--------------
>  drivers/clk/meson/clk-pll.c |  69 ++++++++++++++++---------
>  drivers/clk/meson/clkc.h    |   8 ++-
>  drivers/clk/meson/gxbb.c    | 120 ++++++++++++++++++++++----------------------
>  drivers/clk/meson/meson8b.c |  34 ++++++-------
>  5 files changed, 162 insertions(+), 142 deletions(-)
> 
> diff --git a/drivers/clk/meson/axg.c b/drivers/clk/meson/axg.c
> index 572358062459..d34954bd8c5e 100644
> --- a/drivers/clk/meson/axg.c
> +++ b/drivers/clk/meson/axg.c
> @@ -130,36 +130,36 @@ static struct clk_regmap axg_sys_pll = {
>  	},
>  };
>  
> -static const struct pll_rate_table axg_gp0_pll_rate_table[] = {
> -	PLL_RATE(960000000, 40, 1),
> -	PLL_RATE(984000000, 41, 1),
> -	PLL_RATE(1008000000, 42, 1),
> -	PLL_RATE(1032000000, 43, 1),
> -	PLL_RATE(1056000000, 44, 1),
> -	PLL_RATE(1080000000, 45, 1),
> -	PLL_RATE(1104000000, 46, 1),
> -	PLL_RATE(1128000000, 47, 1),
> -	PLL_RATE(1152000000, 48, 1),
> -	PLL_RATE(1176000000, 49, 1),
> -	PLL_RATE(1200000000, 50, 1),
> -	PLL_RATE(1224000000, 51, 1),
> -	PLL_RATE(1248000000, 52, 1),
> -	PLL_RATE(1272000000, 53, 1),
> -	PLL_RATE(1296000000, 54, 1),
> -	PLL_RATE(1320000000, 55, 1),
> -	PLL_RATE(1344000000, 56, 1),
> -	PLL_RATE(1368000000, 57, 1),
> -	PLL_RATE(1392000000, 58, 1),
> -	PLL_RATE(1416000000, 59, 1),
> -	PLL_RATE(1440000000, 60, 1),
> -	PLL_RATE(1464000000, 61, 1),
> -	PLL_RATE(1488000000, 62, 1),
> -	PLL_RATE(1512000000, 63, 1),
> -	PLL_RATE(1536000000, 64, 1),
> -	PLL_RATE(1560000000, 65, 1),
> -	PLL_RATE(1584000000, 66, 1),
> -	PLL_RATE(1608000000, 67, 1),
> -	PLL_RATE(1632000000, 68, 1),
> +static const struct pll_params_table axg_gp0_pll_params_table[] = {
> +	PLL_PARAMS(40, 1),
> +	PLL_PARAMS(41, 1),
> +	PLL_PARAMS(42, 1),
> +	PLL_PARAMS(43, 1),
> +	PLL_PARAMS(44, 1),
> +	PLL_PARAMS(45, 1),
> +	PLL_PARAMS(46, 1),
> +	PLL_PARAMS(47, 1),
> +	PLL_PARAMS(48, 1),
> +	PLL_PARAMS(49, 1),
> +	PLL_PARAMS(50, 1),
> +	PLL_PARAMS(51, 1),
> +	PLL_PARAMS(52, 1),
> +	PLL_PARAMS(53, 1),
> +	PLL_PARAMS(54, 1),
> +	PLL_PARAMS(55, 1),
> +	PLL_PARAMS(56, 1),
> +	PLL_PARAMS(57, 1),
> +	PLL_PARAMS(58, 1),
> +	PLL_PARAMS(59, 1),
> +	PLL_PARAMS(60, 1),
> +	PLL_PARAMS(61, 1),
> +	PLL_PARAMS(62, 1),
> +	PLL_PARAMS(63, 1),
> +	PLL_PARAMS(64, 1),
> +	PLL_PARAMS(65, 1),
> +	PLL_PARAMS(66, 1),
> +	PLL_PARAMS(67, 1),
> +	PLL_PARAMS(68, 1),
>  	{ /* sentinel */ },
>  };
>  
> @@ -203,7 +203,7 @@ static struct clk_regmap axg_gp0_pll_dco = {
>  			.shift   = 29,
>  			.width   = 1,
>  		},
> -		.table = axg_gp0_pll_rate_table,
> +		.table = axg_gp0_pll_params_table,
>  		.init_regs = axg_gp0_init_regs,
>  		.init_count = ARRAY_SIZE(axg_gp0_init_regs),
>  	},
> @@ -271,7 +271,7 @@ static struct clk_regmap axg_hifi_pll_dco = {
>  			.shift   = 29,
>  			.width   = 1,
>  		},
> -		.table = axg_gp0_pll_rate_table,
> +		.table = axg_gp0_pll_params_table,
>  		.init_regs = axg_hifi_init_regs,
>  		.init_count = ARRAY_SIZE(axg_hifi_init_regs),
>  		.flags = CLK_MESON_PLL_ROUND_CLOSEST,
> @@ -627,11 +627,10 @@ static struct clk_regmap axg_mpll3 = {
>  	},
>  };
>  
> -static const struct pll_rate_table axg_pcie_pll_rate_table[] = {
> +static const struct pll_params_table axg_pcie_pll_params_table[] = {
>  	{
> -		.rate	= 1600000000,
> -		.m	= 200,
> -		.n	= 3,
> +		.m = 200,
> +		.n = 3,
>  	},
>  	{ /* sentinel */ },
>  };
> @@ -678,7 +677,7 @@ static struct clk_regmap axg_pcie_pll_dco = {
>  			.shift   = 29,
>  			.width   = 1,
>  		},
> -		.table = axg_pcie_pll_rate_table,
> +		.table = axg_pcie_pll_params_table,
>  		.init_regs = axg_pcie_init_regs,
>  		.init_count = ARRAY_SIZE(axg_pcie_init_regs),
>  	},
> diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
> index 348a866f09eb..f5b5b3fabe3c 100644
> --- a/drivers/clk/meson/clk-pll.c
> +++ b/drivers/clk/meson/clk-pll.c
> @@ -45,7 +45,7 @@ meson_clk_pll_data(struct clk_regmap *clk)
>  }
>  
>  static unsigned long __pll_params_to_rate(unsigned long parent_rate,
> -					  const struct pll_rate_table *pllt,
> +					  const struct pll_params_table *pllt,
>  					  u16 frac,
>  					  struct meson_clk_pll_data *pll)
>  {
> @@ -66,7 +66,7 @@ static unsigned long meson_clk_pll_recalc_rate(struct clk_hw *hw,
>  {
>  	struct clk_regmap *clk = to_clk_regmap(hw);
>  	struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
> -	struct pll_rate_table pllt;
> +	struct pll_params_table pllt;
>  	u16 frac;
>  
>  	pllt.n = meson_parm_read(clk->map, &pll->n);
> @@ -81,7 +81,7 @@ static unsigned long meson_clk_pll_recalc_rate(struct clk_hw *hw,
>  
>  static u16 __pll_params_with_frac(unsigned long rate,
>  				  unsigned long parent_rate,
> -				  const struct pll_rate_table *pllt,
> +				  const struct pll_params_table *pllt,
>  				  struct meson_clk_pll_data *pll)
>  {
>  	u16 frac_max = (1 << pll->frac.width);
> @@ -97,29 +97,50 @@ static u16 __pll_params_with_frac(unsigned long rate,
>  	return min((u16)val, (u16)(frac_max - 1));
>  }
>  
> -static const struct pll_rate_table *
> +static bool meson_clk_pll_is_better(unsigned long rate,
> +				    unsigned long best,
> +				    unsigned long now,
> +				    struct meson_clk_pll_data *pll)
> +{
> +	if (!(pll->flags & CLK_MESON_PLL_ROUND_CLOSEST) ||
> +	    MESON_PARM_APPLICABLE(&pll->frac)) {
> +		/* Round down */
> +		if (now < rate && best < now)
> +			return true;
> +	} else {
> +		/* Round Closest */
> +		if (abs(now - rate) < abs(best - rate))
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +static const struct pll_params_table *
>  meson_clk_get_pll_settings(unsigned long rate,
> +			   unsigned long parent_rate,
>  			   struct meson_clk_pll_data *pll)
>  {
> -	const struct pll_rate_table *table = pll->table;
> -	unsigned int i = 0;
> +	const struct pll_params_table *table = pll->table;
> +	unsigned long best = 0, now = 0;
> +	unsigned int i, best_i = 0;
>  
>  	if (!table)
>  		return NULL;
>  
> -	/* Find the first table element exceeding rate */
> -	while (table[i].rate && table[i].rate <= rate)
> -		i++;
> +	for (i = 0; table[i].n; i++) {
> +		now = __pll_params_to_rate(parent_rate, &table[i], 0, pll);
>  
> -	if (i != 0) {
> -		if (MESON_PARM_APPLICABLE(&pll->frac) ||
> -		    !(pll->flags & CLK_MESON_PLL_ROUND_CLOSEST) ||
> -		    (abs(rate - table[i - 1].rate) <
> -		     abs(rate - table[i].rate)))
> -			i--;
> +		/* If we get an exact match, don't bother any further */
> +		if (now == rate) {
> +			return &table[i];
> +		} else if (meson_clk_pll_is_better(rate, best, now, pll)) {
> +			best = now;
> +			best_i = i;
> +		}
>  	}
>  
> -	return (struct pll_rate_table *)&table[i];
> +	return (struct pll_params_table *)&table[best_i];
>  }
>  
>  static long meson_clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> @@ -127,16 +148,18 @@ static long meson_clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
>  {
>  	struct clk_regmap *clk = to_clk_regmap(hw);
>  	struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
> -	const struct pll_rate_table *pllt =
> -		meson_clk_get_pll_settings(rate, pll);
> +	const struct pll_params_table *pllt =
> +		meson_clk_get_pll_settings(rate, *parent_rate, pll);
> +	unsigned long round;
>  	u16 frac;
>  
>  	if (!pllt)
>  		return meson_clk_pll_recalc_rate(hw, *parent_rate);
>  
> -	if (!MESON_PARM_APPLICABLE(&pll->frac)
> -	    || rate == pllt->rate)
> -		return pllt->rate;
> +	round = __pll_params_to_rate(*parent_rate, pllt, 0, pll);
> +
> +	if (!MESON_PARM_APPLICABLE(&pll->frac) || rate == round)
> +		return round;
>  
>  	/*
>  	 * The rate provided by the setting is not an exact match, let's
> @@ -214,7 +237,7 @@ static int meson_clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
>  {
>  	struct clk_regmap *clk = to_clk_regmap(hw);
>  	struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
> -	const struct pll_rate_table *pllt;
> +	const struct pll_params_table *pllt;
>  	unsigned int enabled;
>  	unsigned long old_rate;
>  	u16 frac = 0;
> @@ -224,7 +247,7 @@ static int meson_clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
>  
>  	old_rate = rate;
>  
> -	pllt = meson_clk_get_pll_settings(rate, pll);
> +	pllt = meson_clk_get_pll_settings(rate, parent_rate, pll);
>  	if (!pllt)
>  		return -EINVAL;
>  
> diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h
> index a2245e857f70..6b96d55c047d 100644
> --- a/drivers/clk/meson/clkc.h
> +++ b/drivers/clk/meson/clkc.h
> @@ -43,15 +43,13 @@ static inline void meson_parm_write(struct regmap *map, struct parm *p,
>  }
>  
>  
> -struct pll_rate_table {
> -	unsigned long	rate;
> +struct pll_params_table {
>  	u16		m;
>  	u16		n;
>  };
>  
> -#define PLL_RATE(_r, _m, _n)						\
> +#define PLL_PARAMS(_m, _n)						\
>  	{								\
> -		.rate		= (_r),					\
>  		.m		= (_m),					\
>  		.n		= (_n),					\
>  	}
> @@ -67,7 +65,7 @@ struct meson_clk_pll_data {
>  	struct parm rst;
>  	const struct reg_sequence *init_regs;
>  	unsigned int init_count;
> -	const struct pll_rate_table *table;
> +	const struct pll_params_table *table;
>  	u8 flags;
>  };
>  
> diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
> index e2d94498f098..9ac03c7bfbaa 100644
> --- a/drivers/clk/meson/gxbb.c
> +++ b/drivers/clk/meson/gxbb.c
> @@ -18,67 +18,67 @@
>  
>  static DEFINE_SPINLOCK(meson_clk_lock);
>  
> -static const struct pll_rate_table gxbb_gp0_pll_rate_table[] = {
> -	PLL_RATE(768000000, 32, 1),
> -	PLL_RATE(792000000, 33, 1),
> -	PLL_RATE(816000000, 34, 1),
> -	PLL_RATE(840000000, 35, 1),
> -	PLL_RATE(864000000, 36, 1),
> -	PLL_RATE(888000000, 37, 1),
> -	PLL_RATE(912000000, 38, 1),
> -	PLL_RATE(936000000, 39, 1),
> -	PLL_RATE(960000000, 40, 1),
> -	PLL_RATE(984000000, 41, 1),
> -	PLL_RATE(1008000000, 42, 1),
> -	PLL_RATE(1032000000, 43, 1),
> -	PLL_RATE(1056000000, 44, 1),
> -	PLL_RATE(1080000000, 45, 1),
> -	PLL_RATE(1104000000, 46, 1),
> -	PLL_RATE(1128000000, 47, 1),
> -	PLL_RATE(1152000000, 48, 1),
> -	PLL_RATE(1176000000, 49, 1),
> -	PLL_RATE(1200000000, 50, 1),
> -	PLL_RATE(1224000000, 51, 1),
> -	PLL_RATE(1248000000, 52, 1),
> -	PLL_RATE(1272000000, 53, 1),
> -	PLL_RATE(1296000000, 54, 1),
> -	PLL_RATE(1320000000, 55, 1),
> -	PLL_RATE(1344000000, 56, 1),
> -	PLL_RATE(1368000000, 57, 1),
> -	PLL_RATE(1392000000, 58, 1),
> -	PLL_RATE(1416000000, 59, 1),
> -	PLL_RATE(1440000000, 60, 1),
> -	PLL_RATE(1464000000, 61, 1),
> -	PLL_RATE(1488000000, 62, 1),
> +static const struct pll_params_table gxbb_gp0_pll_params_table[] = {
> +	PLL_PARAMS(32, 1),
> +	PLL_PARAMS(33, 1),
> +	PLL_PARAMS(34, 1),
> +	PLL_PARAMS(35, 1),
> +	PLL_PARAMS(36, 1),
> +	PLL_PARAMS(37, 1),
> +	PLL_PARAMS(38, 1),
> +	PLL_PARAMS(39, 1),
> +	PLL_PARAMS(40, 1),
> +	PLL_PARAMS(41, 1),
> +	PLL_PARAMS(42, 1),
> +	PLL_PARAMS(43, 1),
> +	PLL_PARAMS(44, 1),
> +	PLL_PARAMS(45, 1),
> +	PLL_PARAMS(46, 1),
> +	PLL_PARAMS(47, 1),
> +	PLL_PARAMS(48, 1),
> +	PLL_PARAMS(49, 1),
> +	PLL_PARAMS(50, 1),
> +	PLL_PARAMS(51, 1),
> +	PLL_PARAMS(52, 1),
> +	PLL_PARAMS(53, 1),
> +	PLL_PARAMS(54, 1),
> +	PLL_PARAMS(55, 1),
> +	PLL_PARAMS(56, 1),
> +	PLL_PARAMS(57, 1),
> +	PLL_PARAMS(58, 1),
> +	PLL_PARAMS(59, 1),
> +	PLL_PARAMS(60, 1),
> +	PLL_PARAMS(61, 1),
> +	PLL_PARAMS(62, 1),
>  	{ /* sentinel */ },
>  };
>  
> -static const struct pll_rate_table gxl_gp0_pll_rate_table[] = {
> -	PLL_RATE(1008000000, 42, 1),
> -	PLL_RATE(1032000000, 43, 1),
> -	PLL_RATE(1056000000, 44, 1),
> -	PLL_RATE(1080000000, 45, 1),
> -	PLL_RATE(1104000000, 46, 1),
> -	PLL_RATE(1128000000, 47, 1),
> -	PLL_RATE(1152000000, 48, 1),
> -	PLL_RATE(1176000000, 49, 1),
> -	PLL_RATE(1200000000, 50, 1),
> -	PLL_RATE(1224000000, 51, 1),
> -	PLL_RATE(1248000000, 52, 1),
> -	PLL_RATE(1272000000, 53, 1),
> -	PLL_RATE(1296000000, 54, 1),
> -	PLL_RATE(1320000000, 55, 1),
> -	PLL_RATE(1344000000, 56, 1),
> -	PLL_RATE(1368000000, 57, 1),
> -	PLL_RATE(1392000000, 58, 1),
> -	PLL_RATE(1416000000, 59, 1),
> -	PLL_RATE(1440000000, 60, 1),
> -	PLL_RATE(1464000000, 61, 1),
> -	PLL_RATE(1488000000, 62, 1),
> -	PLL_RATE(1512000000, 63, 1),
> -	PLL_RATE(1536000000, 64, 1),
> -	PLL_RATE(1560000000, 65, 1),
> -	PLL_RATE(1584000000, 66, 1),
> +static const struct pll_params_table gxl_gp0_pll_params_table[] = {
> +	PLL_PARAMS(42, 1),
> +	PLL_PARAMS(43, 1),
> +	PLL_PARAMS(44, 1),
> +	PLL_PARAMS(45, 1),
> +	PLL_PARAMS(46, 1),
> +	PLL_PARAMS(47, 1),
> +	PLL_PARAMS(48, 1),
> +	PLL_PARAMS(49, 1),
> +	PLL_PARAMS(50, 1),
> +	PLL_PARAMS(51, 1),
> +	PLL_PARAMS(52, 1),
> +	PLL_PARAMS(53, 1),
> +	PLL_PARAMS(54, 1),
> +	PLL_PARAMS(55, 1),
> +	PLL_PARAMS(56, 1),
> +	PLL_PARAMS(57, 1),
> +	PLL_PARAMS(58, 1),
> +	PLL_PARAMS(59, 1),
> +	PLL_PARAMS(60, 1),
> +	PLL_PARAMS(61, 1),
> +	PLL_PARAMS(62, 1),
> +	PLL_PARAMS(63, 1),
> +	PLL_PARAMS(64, 1),
> +	PLL_PARAMS(65, 1),
> +	PLL_PARAMS(66, 1),
>  	{ /* sentinel */ },
>  };
>  
> @@ -374,7 +374,7 @@ static struct clk_regmap gxbb_gp0_pll_dco = {
>  			.shift   = 29,
>  			.width   = 1,
>  		},
> -		.table = gxbb_gp0_pll_rate_table,
> +		.table = gxbb_gp0_pll_params_table,
>  		.init_regs = gxbb_gp0_init_regs,
>  		.init_count = ARRAY_SIZE(gxbb_gp0_init_regs),
>  	},
> @@ -427,7 +427,7 @@ static struct clk_regmap gxl_gp0_pll_dco = {
>  			.shift   = 29,
>  			.width   = 1,
>  		},
> -		.table = gxl_gp0_pll_rate_table,
> +		.table = gxl_gp0_pll_params_table,
>  		.init_regs = gxl_gp0_init_regs,
>  		.init_count = ARRAY_SIZE(gxl_gp0_init_regs),
>  	},
> diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
> index 17bcf0be56ba..30ae849ff53f 100644
> --- a/drivers/clk/meson/meson8b.c
> +++ b/drivers/clk/meson/meson8b.c
> @@ -29,22 +29,22 @@ struct meson8b_clk_reset {
>  	void __iomem *base;
>  };
>  
> -static const struct pll_rate_table sys_pll_rate_table[] = {
> -	PLL_RATE(1200000000, 50, 1),
> -	PLL_RATE(1224000000, 51, 1),
> -	PLL_RATE(1248000000, 52, 1),
> -	PLL_RATE(1272000000, 53, 1),
> -	PLL_RATE(1296000000, 54, 1),
> -	PLL_RATE(1320000000, 55, 1),
> -	PLL_RATE(1344000000, 56, 1),
> -	PLL_RATE(1368000000, 57, 1),
> -	PLL_RATE(1392000000, 58, 1),
> -	PLL_RATE(1416000000, 59, 1),
> -	PLL_RATE(1440000000, 60, 1),
> -	PLL_RATE(1464000000, 61, 1),
> -	PLL_RATE(1488000000, 62, 1),
> -	PLL_RATE(1512000000, 63, 1),
> -	PLL_RATE(1536000000, 64, 1),
> +static const struct pll_params_table sys_pll_params_table[] = {
> +	PLL_PARAMS(50, 1),
> +	PLL_PARAMS(51, 1),
> +	PLL_PARAMS(52, 1),
> +	PLL_PARAMS(53, 1),
> +	PLL_PARAMS(54, 1),
> +	PLL_PARAMS(55, 1),
> +	PLL_PARAMS(56, 1),
> +	PLL_PARAMS(57, 1),
> +	PLL_PARAMS(58, 1),
> +	PLL_PARAMS(59, 1),
> +	PLL_PARAMS(60, 1),
> +	PLL_PARAMS(61, 1),
> +	PLL_PARAMS(62, 1),
> +	PLL_PARAMS(63, 1),
> +	PLL_PARAMS(64, 1),
>  	{ /* sentinel */ },
>  };
>  
> @@ -195,7 +195,7 @@ static struct clk_regmap meson8b_sys_pll_dco = {
>  			.shift   = 29,
>  			.width   = 1,
>  		},
> -		.table = sys_pll_rate_table,
> +		.table = sys_pll_params_table,
>  	},
>  	.hw.init = &(struct clk_init_data){
>  		.name = "sys_pll_dco",
> 

We could even add ranges instead of table when we know the PLL supports a well-known continuous dividers range.

Acked-by: Neil Armstrong <narmstrong@baylibre.com>