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Date: Thu, 3 Feb 2022 12:15:45 +0100
From: Nicolas Ferre <nicolas.ferre@...rochip.com>
To: Claudiu Beznea <claudiu.beznea@...rochip.com>,
<mturquette@...libre.com>, <sboyd@...nel.org>,
<alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>
CC: <linux-clk@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: at91: clk-master: remove dead code
On 03/02/2022 at 12:02, Claudiu Beznea wrote:
> Commit facb87ad7560 ("clk: at91: sama7g5: remove prescaler part of master
> clock") removed the master clock's prescaler from clock tree of SAMA7G5
> as it has been discovered that there is a hardware bug when trying to
> change it at run-time (bug is described in description of
> commit facb87ad7560 ("clk: at91: sama7g5: remove prescaler part of master
> clock")). This was previously changed at CPUFreq driver request. Thus, with
> commit facb87ad7560 ("clk: at91: sama7g5: remove prescaler part of master
> clock") there is no need of code that handles run-time changes of master
> clock's prescaler, thus remove this code.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
It looks good to me:
Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Thanks Claudiu.
Best regards,
Nicolas
> ---
> drivers/clk/at91/at91rm9200.c | 3 +-
> drivers/clk/at91/at91sam9260.c | 3 +-
> drivers/clk/at91/at91sam9g45.c | 3 +-
> drivers/clk/at91/at91sam9n12.c | 3 +-
> drivers/clk/at91/at91sam9rl.c | 3 +-
> drivers/clk/at91/at91sam9x5.c | 3 +-
> drivers/clk/at91/clk-master.c | 117 ++-------------------------------
> drivers/clk/at91/dt-compat.c | 3 +-
> drivers/clk/at91/pmc.h | 2 +-
> drivers/clk/at91/sam9x60.c | 3 +-
> drivers/clk/at91/sama5d2.c | 3 +-
> drivers/clk/at91/sama5d3.c | 3 +-
> drivers/clk/at91/sama5d4.c | 3 +-
> 13 files changed, 18 insertions(+), 134 deletions(-)
>
> diff --git a/drivers/clk/at91/at91rm9200.c b/drivers/clk/at91/at91rm9200.c
> index fff4fdda974f..b174f727a8ef 100644
> --- a/drivers/clk/at91/at91rm9200.c
> +++ b/drivers/clk/at91/at91rm9200.c
> @@ -143,8 +143,7 @@ static void __init at91rm9200_pmc_setup(struct device_node *np)
> parent_names,
> &at91rm9200_master_layout,
> &rm9200_mck_characteristics,
> - &rm9200_mck_lock, CLK_SET_RATE_GATE,
> - INT_MIN);
> + &rm9200_mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/at91sam9260.c b/drivers/clk/at91/at91sam9260.c
> index 79802f864ee5..11550e50cd9f 100644
> --- a/drivers/clk/at91/at91sam9260.c
> +++ b/drivers/clk/at91/at91sam9260.c
> @@ -419,8 +419,7 @@ static void __init at91sam926x_pmc_setup(struct device_node *np,
> parent_names,
> &at91rm9200_master_layout,
> data->mck_characteristics,
> - &at91sam9260_mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &at91sam9260_mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/at91sam9g45.c b/drivers/clk/at91/at91sam9g45.c
> index 7ed984f8058c..8c9344451f46 100644
> --- a/drivers/clk/at91/at91sam9g45.c
> +++ b/drivers/clk/at91/at91sam9g45.c
> @@ -154,8 +154,7 @@ static void __init at91sam9g45_pmc_setup(struct device_node *np)
> parent_names,
> &at91rm9200_master_layout,
> &mck_characteristics,
> - &at91sam9g45_mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &at91sam9g45_mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/at91sam9n12.c b/drivers/clk/at91/at91sam9n12.c
> index 63cc58944b00..0bb19400d199 100644
> --- a/drivers/clk/at91/at91sam9n12.c
> +++ b/drivers/clk/at91/at91sam9n12.c
> @@ -181,8 +181,7 @@ static void __init at91sam9n12_pmc_setup(struct device_node *np)
> parent_names,
> &at91sam9x5_master_layout,
> &mck_characteristics,
> - &at91sam9n12_mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &at91sam9n12_mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/at91sam9rl.c b/drivers/clk/at91/at91sam9rl.c
> index 4d4faf6c61d8..b992137bab02 100644
> --- a/drivers/clk/at91/at91sam9rl.c
> +++ b/drivers/clk/at91/at91sam9rl.c
> @@ -123,8 +123,7 @@ static void __init at91sam9rl_pmc_setup(struct device_node *np)
> parent_names,
> &at91rm9200_master_layout,
> &sam9rl_mck_characteristics,
> - &sam9rl_mck_lock, CLK_SET_RATE_GATE,
> - INT_MIN);
> + &sam9rl_mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/at91sam9x5.c b/drivers/clk/at91/at91sam9x5.c
> index bd8007b4f3e0..3857db2e144b 100644
> --- a/drivers/clk/at91/at91sam9x5.c
> +++ b/drivers/clk/at91/at91sam9x5.c
> @@ -201,8 +201,7 @@ static void __init at91sam9x5_pmc_setup(struct device_node *np,
> hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4,
> parent_names,
> &at91sam9x5_master_layout,
> - &mck_characteristics, &mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &mck_characteristics, &mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
> index b2d0a7f4f7f9..164e2959c7cf 100644
> --- a/drivers/clk/at91/clk-master.c
> +++ b/drivers/clk/at91/clk-master.c
> @@ -374,85 +374,6 @@ static void clk_sama7g5_master_best_diff(struct clk_rate_request *req,
> }
> }
>
> -static int clk_master_pres_determine_rate(struct clk_hw *hw,
> - struct clk_rate_request *req)
> -{
> - struct clk_master *master = to_clk_master(hw);
> - struct clk_rate_request req_parent = *req;
> - const struct clk_master_characteristics *characteristics =
> - master->characteristics;
> - struct clk_hw *parent;
> - long best_rate = LONG_MIN, best_diff = LONG_MIN;
> - u32 pres;
> - int i;
> -
> - if (master->chg_pid < 0)
> - return -EOPNOTSUPP;
> -
> - parent = clk_hw_get_parent_by_index(hw, master->chg_pid);
> - if (!parent)
> - return -EOPNOTSUPP;
> -
> - for (i = 0; i <= MASTER_PRES_MAX; i++) {
> - if (characteristics->have_div3_pres && i == MASTER_PRES_MAX)
> - pres = 3;
> - else
> - pres = 1 << i;
> -
> - req_parent.rate = req->rate * pres;
> - if (__clk_determine_rate(parent, &req_parent))
> - continue;
> -
> - clk_sama7g5_master_best_diff(req, parent, req_parent.rate,
> - &best_diff, &best_rate, pres);
> - if (!best_diff)
> - break;
> - }
> -
> - return 0;
> -}
> -
> -static int clk_master_pres_set_rate(struct clk_hw *hw, unsigned long rate,
> - unsigned long parent_rate)
> -{
> - struct clk_master *master = to_clk_master(hw);
> - unsigned long flags;
> - unsigned int pres, mckr, tmp;
> - int ret;
> -
> - pres = DIV_ROUND_CLOSEST(parent_rate, rate);
> - if (pres > MASTER_PRES_MAX)
> - return -EINVAL;
> -
> - else if (pres == 3)
> - pres = MASTER_PRES_MAX;
> - else if (pres)
> - pres = ffs(pres) - 1;
> -
> - spin_lock_irqsave(master->lock, flags);
> - ret = regmap_read(master->regmap, master->layout->offset, &mckr);
> - if (ret)
> - goto unlock;
> -
> - mckr &= master->layout->mask;
> - tmp = (mckr >> master->layout->pres_shift) & MASTER_PRES_MASK;
> - if (pres == tmp)
> - goto unlock;
> -
> - mckr &= ~(MASTER_PRES_MASK << master->layout->pres_shift);
> - mckr |= (pres << master->layout->pres_shift);
> - ret = regmap_write(master->regmap, master->layout->offset, mckr);
> - if (ret)
> - goto unlock;
> -
> - while (!clk_master_ready(master))
> - cpu_relax();
> -unlock:
> - spin_unlock_irqrestore(master->lock, flags);
> -
> - return ret;
> -}
> -
> static unsigned long clk_master_pres_recalc_rate(struct clk_hw *hw,
> unsigned long parent_rate)
> {
> @@ -539,13 +460,6 @@ static void clk_master_pres_restore_context(struct clk_hw *hw)
> pr_warn("MCKR PRES was not configured properly by firmware!\n");
> }
>
> -static void clk_master_pres_restore_context_chg(struct clk_hw *hw)
> -{
> - struct clk_master *master = to_clk_master(hw);
> -
> - clk_master_pres_set_rate(hw, master->pms.rate, master->pms.parent_rate);
> -}
> -
> static const struct clk_ops master_pres_ops = {
> .prepare = clk_master_prepare,
> .is_prepared = clk_master_is_prepared,
> @@ -555,25 +469,13 @@ static const struct clk_ops master_pres_ops = {
> .restore_context = clk_master_pres_restore_context,
> };
>
> -static const struct clk_ops master_pres_ops_chg = {
> - .prepare = clk_master_prepare,
> - .is_prepared = clk_master_is_prepared,
> - .determine_rate = clk_master_pres_determine_rate,
> - .recalc_rate = clk_master_pres_recalc_rate,
> - .get_parent = clk_master_pres_get_parent,
> - .set_rate = clk_master_pres_set_rate,
> - .save_context = clk_master_pres_save_context,
> - .restore_context = clk_master_pres_restore_context_chg,
> -};
> -
> static struct clk_hw * __init
> at91_clk_register_master_internal(struct regmap *regmap,
> const char *name, int num_parents,
> const char **parent_names,
> const struct clk_master_layout *layout,
> const struct clk_master_characteristics *characteristics,
> - const struct clk_ops *ops, spinlock_t *lock, u32 flags,
> - int chg_pid)
> + const struct clk_ops *ops, spinlock_t *lock, u32 flags)
> {
> struct clk_master *master;
> struct clk_init_data init;
> @@ -599,7 +501,6 @@ at91_clk_register_master_internal(struct regmap *regmap,
> master->layout = layout;
> master->characteristics = characteristics;
> master->regmap = regmap;
> - master->chg_pid = chg_pid;
> master->lock = lock;
>
> if (ops == &master_div_ops_chg) {
> @@ -628,19 +529,13 @@ at91_clk_register_master_pres(struct regmap *regmap,
> const char **parent_names,
> const struct clk_master_layout *layout,
> const struct clk_master_characteristics *characteristics,
> - spinlock_t *lock, u32 flags, int chg_pid)
> + spinlock_t *lock)
> {
> - const struct clk_ops *ops;
> -
> - if (flags & CLK_SET_RATE_GATE)
> - ops = &master_pres_ops;
> - else
> - ops = &master_pres_ops_chg;
> -
> return at91_clk_register_master_internal(regmap, name, num_parents,
> parent_names, layout,
> - characteristics, ops,
> - lock, flags, chg_pid);
> + characteristics,
> + &master_pres_ops,
> + lock, CLK_SET_RATE_GATE);
> }
>
> struct clk_hw * __init
> @@ -661,7 +556,7 @@ at91_clk_register_master_div(struct regmap *regmap,
> hw = at91_clk_register_master_internal(regmap, name, 1,
> &parent_name, layout,
> characteristics, ops,
> - lock, flags, -EINVAL);
> + lock, flags);
>
> if (!IS_ERR(hw) && safe_div) {
> master_div = to_clk_master(hw);
> diff --git a/drivers/clk/at91/dt-compat.c b/drivers/clk/at91/dt-compat.c
> index ca2dbb65b9df..8ca8bcacf66d 100644
> --- a/drivers/clk/at91/dt-compat.c
> +++ b/drivers/clk/at91/dt-compat.c
> @@ -392,8 +392,7 @@ of_at91_clk_master_setup(struct device_node *np,
>
> hw = at91_clk_register_master_pres(regmap, "masterck_pres", num_parents,
> parent_names, layout,
> - characteristics, &mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + characteristics, &mck_lock);
> if (IS_ERR(hw))
> goto out_free_characteristics;
>
> diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
> index 3a1bf6194c28..efe4975bddc3 100644
> --- a/drivers/clk/at91/pmc.h
> +++ b/drivers/clk/at91/pmc.h
> @@ -175,7 +175,7 @@ at91_clk_register_master_pres(struct regmap *regmap, const char *name,
> int num_parents, const char **parent_names,
> const struct clk_master_layout *layout,
> const struct clk_master_characteristics *characteristics,
> - spinlock_t *lock, u32 flags, int chg_pid);
> + spinlock_t *lock);
>
> struct clk_hw * __init
> at91_clk_register_master_div(struct regmap *regmap, const char *name,
> diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c
> index 5c264185f261..9ea4ce501bad 100644
> --- a/drivers/clk/at91/sam9x60.c
> +++ b/drivers/clk/at91/sam9x60.c
> @@ -271,8 +271,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np)
> parent_names[2] = "pllack_divck";
> hw = at91_clk_register_master_pres(regmap, "masterck_pres", 3,
> parent_names, &sam9x60_master_layout,
> - &mck_characteristics, &mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &mck_characteristics, &mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/sama5d2.c b/drivers/clk/at91/sama5d2.c
> index f479e39e3bb2..cfd0f5e23b99 100644
> --- a/drivers/clk/at91/sama5d2.c
> +++ b/drivers/clk/at91/sama5d2.c
> @@ -242,8 +242,7 @@ static void __init sama5d2_pmc_setup(struct device_node *np)
> hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4,
> parent_names,
> &at91sam9x5_master_layout,
> - &mck_characteristics, &mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &mck_characteristics, &mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/sama5d3.c b/drivers/clk/at91/sama5d3.c
> index 339d0f382ff0..7e93c6edf305 100644
> --- a/drivers/clk/at91/sama5d3.c
> +++ b/drivers/clk/at91/sama5d3.c
> @@ -175,8 +175,7 @@ static void __init sama5d3_pmc_setup(struct device_node *np)
> hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4,
> parent_names,
> &at91sam9x5_master_layout,
> - &mck_characteristics, &mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &mck_characteristics, &mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
> diff --git a/drivers/clk/at91/sama5d4.c b/drivers/clk/at91/sama5d4.c
> index 4af75b1e39e9..1a14a9bce308 100644
> --- a/drivers/clk/at91/sama5d4.c
> +++ b/drivers/clk/at91/sama5d4.c
> @@ -190,8 +190,7 @@ static void __init sama5d4_pmc_setup(struct device_node *np)
> hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4,
> parent_names,
> &at91sam9x5_master_layout,
> - &mck_characteristics, &mck_lock,
> - CLK_SET_RATE_GATE, INT_MIN);
> + &mck_characteristics, &mck_lock);
> if (IS_ERR(hw))
> goto err_free;
>
--
Nicolas Ferre
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