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clk: sunxi-ng: Fix fractional mode for N-M clocks
N-M factor clock driver is missing a call to ccu_frac_helper_enable()
when fractional mode is used. Additionally, most SoCs require that M
factor must be set to 0 when fractional mode is used.
Without this patch, clock keeps the old value and clk_set_rate() returns
without error.
Fixes: 6174a1e24b
("clk: sunxi-ng: Add N-M-factor clock support")
CC: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
This commit is contained in:
parent
f70893dcce
commit
b64dfec010
1 changed files with 14 additions and 2 deletions
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@ -117,10 +117,22 @@ static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long flags;
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unsigned long flags;
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u32 reg;
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u32 reg;
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if (ccu_frac_helper_has_rate(&nm->common, &nm->frac, rate))
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if (ccu_frac_helper_has_rate(&nm->common, &nm->frac, rate)) {
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spin_lock_irqsave(nm->common.lock, flags);
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/* most SoCs require M to be 0 if fractional mode is used */
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reg = readl(nm->common.base + nm->common.reg);
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reg &= ~GENMASK(nm->m.width + nm->m.shift - 1, nm->m.shift);
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writel(reg, nm->common.base + nm->common.reg);
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spin_unlock_irqrestore(nm->common.lock, flags);
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ccu_frac_helper_enable(&nm->common, &nm->frac);
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return ccu_frac_helper_set_rate(&nm->common, &nm->frac, rate);
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return ccu_frac_helper_set_rate(&nm->common, &nm->frac, rate);
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else
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} else {
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ccu_frac_helper_disable(&nm->common, &nm->frac);
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ccu_frac_helper_disable(&nm->common, &nm->frac);
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}
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_nm.min_n = nm->n.min ?: 1;
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_nm.min_n = nm->n.min ?: 1;
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_nm.max_n = nm->n.max ?: 1 << nm->n.width;
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_nm.max_n = nm->n.max ?: 1 << nm->n.width;
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