diff options
Diffstat (limited to 'drivers/clk/meson/clk-pll.c')
| -rw-r--r-- | drivers/clk/meson/clk-pll.c | 61 |
1 files changed, 36 insertions, 25 deletions
diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c index 6fa7639a3050..e8e53855b00a 100644 --- a/drivers/clk/meson/clk-pll.c +++ b/drivers/clk/meson/clk-pll.c @@ -57,12 +57,13 @@ static unsigned long __pll_params_to_rate(unsigned long parent_rate, struct meson_clk_pll_data *pll) { u64 rate = (u64)parent_rate * m; + unsigned int frac_max = pll->frac_max ? pll->frac_max : + (1 << pll->frac.width); if (frac && MESON_PARM_APPLICABLE(&pll->frac)) { u64 frac_rate = (u64)parent_rate * frac; - rate += DIV_ROUND_UP_ULL(frac_rate, - (1 << pll->frac.width)); + rate += DIV_ROUND_UP_ULL(frac_rate, frac_max); } return DIV_ROUND_UP_ULL(rate, n); @@ -100,7 +101,8 @@ static unsigned int __pll_params_with_frac(unsigned long rate, unsigned int n, struct meson_clk_pll_data *pll) { - unsigned int frac_max = (1 << pll->frac.width); + unsigned int frac_max = pll->frac_max ? pll->frac_max : + (1 << pll->frac.width); u64 val = (u64)rate * n; /* Bail out if we are already over the requested rate */ @@ -289,11 +291,35 @@ static int meson_clk_pll_wait_lock(struct clk_hw *hw) return -ETIMEDOUT; } +static int meson_clk_pll_is_enabled(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_clk_pll_data *pll = meson_clk_pll_data(clk); + + if (MESON_PARM_APPLICABLE(&pll->rst) && + meson_parm_read(clk->map, &pll->rst)) + return 0; + + if (!meson_parm_read(clk->map, &pll->en) || + !meson_parm_read(clk->map, &pll->l)) + return 0; + + return 1; +} + static int meson_clk_pll_init(struct clk_hw *hw) { struct clk_regmap *clk = to_clk_regmap(hw); struct meson_clk_pll_data *pll = meson_clk_pll_data(clk); + /* + * Keep the clock running, which was already initialized and enabled + * from the bootloader stage, to avoid any glitches. + */ + if ((pll->flags & CLK_MESON_PLL_NOINIT_ENABLED) && + meson_clk_pll_is_enabled(hw)) + return 0; + if (pll->init_count) { if (MESON_PARM_APPLICABLE(&pll->rst)) meson_parm_write(clk->map, &pll->rst, 1); @@ -308,22 +334,6 @@ static int meson_clk_pll_init(struct clk_hw *hw) return 0; } -static int meson_clk_pll_is_enabled(struct clk_hw *hw) -{ - struct clk_regmap *clk = to_clk_regmap(hw); - struct meson_clk_pll_data *pll = meson_clk_pll_data(clk); - - if (MESON_PARM_APPLICABLE(&pll->rst) && - meson_parm_read(clk->map, &pll->rst)) - return 0; - - if (!meson_parm_read(clk->map, &pll->en) || - !meson_parm_read(clk->map, &pll->l)) - return 0; - - return 1; -} - static int meson_clk_pcie_pll_enable(struct clk_hw *hw) { int retries = 10; @@ -436,8 +446,8 @@ static int meson_clk_pll_set_rate(struct clk_hw *hw, unsigned long rate, ret = meson_clk_pll_enable(hw); if (ret) { - pr_warn("%s: pll did not lock, trying to restore old rate %lu\n", - __func__, old_rate); + pr_warn("%s: pll %s didn't lock, trying to set old rate %lu\n", + __func__, clk_hw_get_name(hw), old_rate); /* * FIXME: Do we really need/want this HACK ? * It looks unsafe. what happens if the clock gets into a @@ -464,7 +474,7 @@ const struct clk_ops meson_clk_pcie_pll_ops = { .enable = meson_clk_pcie_pll_enable, .disable = meson_clk_pll_disable }; -EXPORT_SYMBOL_GPL(meson_clk_pcie_pll_ops); +EXPORT_SYMBOL_NS_GPL(meson_clk_pcie_pll_ops, "CLK_MESON"); const struct clk_ops meson_clk_pll_ops = { .init = meson_clk_pll_init, @@ -475,15 +485,16 @@ const struct clk_ops meson_clk_pll_ops = { .enable = meson_clk_pll_enable, .disable = meson_clk_pll_disable }; -EXPORT_SYMBOL_GPL(meson_clk_pll_ops); +EXPORT_SYMBOL_NS_GPL(meson_clk_pll_ops, "CLK_MESON"); const struct clk_ops meson_clk_pll_ro_ops = { .recalc_rate = meson_clk_pll_recalc_rate, .is_enabled = meson_clk_pll_is_enabled, }; -EXPORT_SYMBOL_GPL(meson_clk_pll_ro_ops); +EXPORT_SYMBOL_NS_GPL(meson_clk_pll_ro_ops, "CLK_MESON"); MODULE_DESCRIPTION("Amlogic PLL driver"); MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); -MODULE_LICENSE("GPL v2"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("CLK_MESON"); |