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| author |   Frank Oltmanns <frank@oltmanns.dev> | 2023-08-07 14:43:39 +0200 |
|---|---|---|
| committer |   Chen-Yu Tsai <wens@csie.org> | 2023-08-09 23:33:58 +0800 |
| commit | c0380d14745194906c378d2494fc494239e16a85 (patch) | |
| tree | b4fba792bf372a2e8bcbbc6dcc71a518cdd70f58 /drivers/clk/sunxi-ng | |
| parent | clk: sunxi-ng: Add helper function to find closest rate (diff) | |
| download | wireguard-linux-c0380d14745194906c378d2494fc494239e16a85.tar.xz wireguard-linux-c0380d14745194906c378d2494fc494239e16a85.zip | |
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.
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
Link: https://lore.kernel.org/r/20230807-pll-mipi_set_rate_parent-v6-6-f173239a4b59@oltmanns.dev
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Diffstat (limited to 'drivers/clk/sunxi-ng')
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_nm.c | 13 | ||||
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_nm.h | 48 |
2 files changed, 50 insertions, 11 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_nm.c b/drivers/clk/sunxi-ng/ccu_nm.c index c1fd11542c45..ffac3deb89d6 100644 --- a/drivers/clk/sunxi-ng/ccu_nm.c +++ b/drivers/clk/sunxi-ng/ccu_nm.c @@ -27,8 +27,8 @@ static unsigned long ccu_nm_calc_rate(unsigned long parent, return rate; } -static unsigned long ccu_nm_find_best(unsigned long parent, unsigned long rate, - struct _ccu_nm *nm) +static unsigned long ccu_nm_find_best(struct ccu_common *common, unsigned long parent, + unsigned long rate, struct _ccu_nm *nm) { 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(&nm->common, *parent_rate, rate, &_nm); 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(&nm->common, parent_rate, rate, &_nm); } 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, \ |