2023-07-17 14:24:20

by Frank Oltmanns

[permalink] [raw]

Subject: [PATCH v4 07/11] clk: sunxi-ng: nm: Support finding closest rate

---

Use the helper function ccu_is_better_rate() to determine the rate that
is closest to the requested rate, thereby supporting rates that are
higher than the requested rate if the clock uses the
CCU_FEATURE_CLOSEST_RATE.

Add the macro SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST which
sets CCU_FEATURE_CLOSEST_RATE.

To avoid code duplication, add the macros
SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_FEAT that allows selecting
arbitrary features and use it in the original
SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX as well as the newly introduced
SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST macros.

Signed-off-by: Frank Oltmanns <[email protected]>
---
drivers/clk/sunxi-ng/ccu_nm.c | 11 ++++------
drivers/clk/sunxi-ng/ccu_nm.h | 48 ++++++++++++++++++++++++++++++++++++++++---
2 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c
index c1fd11542c45..35d00783d748 100644
--- a/drivers/clk/sunxi-ng/ccu_nm.c
+++ b/drivers/clk/sunxi-ng/ccu_nm.c
@@ -28,7 +28,7 @@ static unsigned long ccu_nm_calc_rate(unsigned long parent,
}

static unsigned long ccu_nm_find_best(unsigned long parent, unsigned long rate,
- struct _ccu_nm *nm)
+ struct _ccu_nm *nm, struct ccu_common *common)
{
unsigned long best_rate = 0;
unsigned long best_n = 0, best_m = 0;
@@ -39,10 +39,7 @@ static unsigned long ccu_nm_find_best(unsigned long parent, unsigned long rate,
unsigned long tmp_rate = ccu_nm_calc_rate(parent,
_n, _m);

- if (tmp_rate > rate)
- continue;
-
- if ((rate - tmp_rate) < (rate - best_rate)) {
+ if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) {
best_rate = tmp_rate;
best_n = _n;
best_m = _m;
@@ -159,7 +156,7 @@ static long ccu_nm_round_rate(struct clk_hw *hw, unsigned long rate,
_nm.min_m = 1;
_nm.max_m = nm->m.max ?: 1 << nm->m.width;

- rate = ccu_nm_find_best(*parent_rate, rate, &_nm);
+ rate = ccu_nm_find_best(*parent_rate, rate, &_nm, &nm->common);

if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
rate /= nm->fixed_post_div;
@@ -210,7 +207,7 @@ static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
&_nm.m, &_nm.n);
} else {
ccu_sdm_helper_disable(&nm->common, &nm->sdm);
- ccu_nm_find_best(parent_rate, rate, &_nm);
+ ccu_nm_find_best(parent_rate, rate, &_nm, &nm->common);
}

spin_lock_irqsave(nm->common.lock, flags);
diff --git a/drivers/clk/sunxi-ng/ccu_nm.h b/drivers/clk/sunxi-ng/ccu_nm.h
index 2904e67f05a8..93c11693574f 100644
--- a/drivers/clk/sunxi-ng/ccu_nm.h
+++ b/drivers/clk/sunxi-ng/ccu_nm.h
@@ -108,7 +108,7 @@ struct ccu_nm {
}, \
}

-#define SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX(_struct, _name, \
+#define SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_FEAT(_struct, _name, \
_parent, _reg, \
_min_rate, _max_rate, \
_nshift, _nwidth, \
@@ -116,7 +116,8 @@ struct ccu_nm {
_frac_en, _frac_sel, \
_frac_rate_0, \
_frac_rate_1, \
- _gate, _lock, _flags) \
+ _gate, _lock, _flags, \
+ _features) \
struct ccu_nm _struct = { \
.enable = _gate, \
.lock = _lock, \
@@ -129,7 +130,7 @@ struct ccu_nm {
.max_rate = _max_rate, \
.common = { \
.reg = _reg, \
- .features = CCU_FEATURE_FRACTIONAL, \
+ .features = _features, \
.hw.init = CLK_HW_INIT(_name, \
_parent, \
&ccu_nm_ops, \
@@ -137,6 +138,47 @@ struct ccu_nm {
}, \
}

+#define SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX(_struct, _name, \
+ _parent, _reg, \
+ _min_rate, _max_rate, \
+ _nshift, _nwidth, \
+ _mshift, _mwidth, \
+ _frac_en, _frac_sel, \
+ _frac_rate_0, \
+ _frac_rate_1, \
+ _gate, _lock, _flags) \
+ SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_FEAT(_struct, _name, \
+ _parent, _reg, \
+ _min_rate, _max_rate, \
+ _nshift, _nwidth, \
+ _mshift, _mwidth, \
+ _frac_en, _frac_sel, \
+ _frac_rate_0, \
+ _frac_rate_1, \
+ _gate, _lock, _flags, \
+ CCU_FEATURE_FRACTIONAL)
+
+#define SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST(_struct, _name, \
+ _parent, _reg, \
+ _min_rate, _max_rate, \
+ _nshift, _nwidth, \
+ _mshift, _mwidth, \
+ _frac_en, _frac_sel, \
+ _frac_rate_0, \
+ _frac_rate_1, \
+ _gate, _lock, _flags) \
+ SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_FEAT(_struct, _name, \
+ _parent, _reg, \
+ _min_rate, _max_rate, \
+ _nshift, _nwidth, \
+ _mshift, _mwidth, \
+ _frac_en, _frac_sel, \
+ _frac_rate_0, \
+ _frac_rate_1, \
+ _gate, _lock, _flags, \
+ CCU_FEATURE_FRACTIONAL |\
+ CCU_FEATURE_CLOSEST_RATE)
+
#define SUNXI_CCU_NM_WITH_GATE_LOCK(_struct, _name, _parent, _reg, \
_nshift, _nwidth, \
_mshift, _mwidth, \

--
2.41.0

2023-07-17 14:26:23

by Maxime Ripard

[permalink] [raw]

Subject: Re: [PATCH v4 07/11] clk: sunxi-ng: nm: Support finding closest rate

---

On Mon, Jul 17, 2023 at 03:34:31PM +0200, Frank Oltmanns wrote:
> Use the helper function ccu_is_better_rate() to determine the rate that
> is closest to the requested rate, thereby supporting rates that are
> higher than the requested rate if the clock uses the
> CCU_FEATURE_CLOSEST_RATE.
>
> Add the macro SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST which
> sets CCU_FEATURE_CLOSEST_RATE.
>
> To avoid code duplication, add the macros
> SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_FEAT that allows selecting
> arbitrary features and use it in the original
> SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX as well as the newly introduced
> SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST macros.
>
> Signed-off-by: Frank Oltmanns <[email protected]>
> ---
> drivers/clk/sunxi-ng/ccu_nm.c | 11 ++++------
> drivers/clk/sunxi-ng/ccu_nm.h | 48 ++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 49 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c
> index c1fd11542c45..35d00783d748 100644
> --- a/drivers/clk/sunxi-ng/ccu_nm.c
> +++ b/drivers/clk/sunxi-ng/ccu_nm.c
> @@ -28,7 +28,7 @@ static unsigned long ccu_nm_calc_rate(unsigned long parent,
> }
>
> static unsigned long ccu_nm_find_best(unsigned long parent, unsigned long rate,
> - struct _ccu_nm *nm)
> + struct _ccu_nm *nm, struct ccu_common *common)

The common pointer must be the first argument.

Once fixed,
Acked-by: Maxime Ripard <[email protected]>

Maxime

---

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2023-07-23 07:45:36

by Frank Oltmanns

[permalink] [raw]

Subject: Re: [PATCH v4 07/11] clk: sunxi-ng: nm: Support finding closest rate

---

On 2023-07-17 at 16:12:30 +0200, Maxime Ripard <[email protected]> wrote:
> [[PGP Signed Part:Undecided]]
> On Mon, Jul 17, 2023 at 03:34:31PM +0200, Frank Oltmanns wrote:
>> Use the helper function ccu_is_better_rate() to determine the rate that
>> is closest to the requested rate, thereby supporting rates that are
>> higher than the requested rate if the clock uses the
>> CCU_FEATURE_CLOSEST_RATE.
>>
>> Add the macro SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST which
>> sets CCU_FEATURE_CLOSEST_RATE.
>>
>> To avoid code duplication, add the macros
>> SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_FEAT that allows selecting
>> arbitrary features and use it in the original
>> SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX as well as the newly introduced
>> SUNXI_CCU_NM_WITH_FRAC_GATE_LOCK_MIN_MAX_CLOSEST macros.
>>
>> Signed-off-by: Frank Oltmanns <[email protected]>
>> ---
>> drivers/clk/sunxi-ng/ccu_nm.c | 11 ++++------
>> drivers/clk/sunxi-ng/ccu_nm.h | 48 ++++++++++++++++++++++++++++++++++++++++---
>> 2 files changed, 49 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c
>> index c1fd11542c45..35d00783d748 100644
>> --- a/drivers/clk/sunxi-ng/ccu_nm.c
>> +++ b/drivers/clk/sunxi-ng/ccu_nm.c
>> @@ -28,7 +28,7 @@ static unsigned long ccu_nm_calc_rate(unsigned long parent,
>> }
>>
>> static unsigned long ccu_nm_find_best(unsigned long parent, unsigned long rate,
>> - struct _ccu_nm *nm)
>> + struct _ccu_nm *nm, struct ccu_common *common)
>
> The common pointer must be the first argument.
>

Same question as for patch 08: Should I also pull *nm to the beginning?
If so, do you have a preference on the order of *nm and *common?

Thanks,
Frank

>
> Once fixed,
> Acked-by: Maxime Ripard <[email protected]>
>
> Maxime
>
> [[End of PGP Signed Part]]