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Message-Id: <20230717-pll-mipi_set_rate_parent-v4-7-04acf1d39765@oltmanns.dev>
Date: Mon, 17 Jul 2023 15:34:31 +0200
From: Frank Oltmanns <frank@...manns.dev>
To: Maxime Ripard <mripard@...nel.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Andre Przywara <andre.przywara@....com>,
Roman Beranek <me@...y.cz>
Cc: linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
Frank Oltmanns <frank@...manns.dev>
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 <frank@...manns.dev>
---
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
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