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author | Dmitry Osipenko <digetx@gmail.com> | 2019-04-19 14:42:26 +0300 |
---|---|---|
committer | Stephen Boyd <sboyd@kernel.org> | 2019-04-19 15:14:19 -0700 |
commit | bff1cef5f23afbe49f5ebd766980dc612f5e9d0a (patch) | |
tree | 1bb8182626caf7d198f9891d55380267458dc4a2 /drivers/clk/tegra | |
parent | 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff) | |
download | linux-bff1cef5f23afbe49f5ebd766980dc612f5e9d0a.tar.gz linux-bff1cef5f23afbe49f5ebd766980dc612f5e9d0a.tar.bz2 linux-bff1cef5f23afbe49f5ebd766980dc612f5e9d0a.zip |
clk: tegra: Don't enable already enabled PLLs
Initially Common Clock Framework isn't aware of the clock-enable status,
this results in enabling of clocks that were enabled by bootloader. This
is not a big deal for a regular clock-gates, but for PLL's it may have
some unpleasant consequences. Thus re-enabling PLLX (the main CPU parent
clock) may result in extra long period of PLL re-locking.
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/tegra')
-rw-r--r-- | drivers/clk/tegra/clk-pll.c | 50 |
1 files changed, 37 insertions, 13 deletions
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c index b50b7460014b..ebc8481a2122 100644 --- a/drivers/clk/tegra/clk-pll.c +++ b/drivers/clk/tegra/clk-pll.c @@ -444,6 +444,9 @@ static int clk_pll_enable(struct clk_hw *hw) unsigned long flags = 0; int ret; + if (clk_pll_is_enabled(hw)) + return 0; + if (pll->lock) spin_lock_irqsave(pll->lock, flags); @@ -940,11 +943,16 @@ static int clk_plle_training(struct tegra_clk_pll *pll) static int clk_plle_enable(struct clk_hw *hw) { struct tegra_clk_pll *pll = to_clk_pll(hw); - unsigned long input_rate = clk_hw_get_rate(clk_hw_get_parent(hw)); struct tegra_clk_pll_freq_table sel; + unsigned long input_rate; u32 val; int err; + if (clk_pll_is_enabled(hw)) + return 0; + + input_rate = clk_hw_get_rate(clk_hw_get_parent(hw)); + if (_get_table_rate(hw, &sel, pll->params->fixed_rate, input_rate)) return -EINVAL; @@ -1355,6 +1363,9 @@ static int clk_pllc_enable(struct clk_hw *hw) int ret; unsigned long flags = 0; + if (clk_pll_is_enabled(hw)) + return 0; + if (pll->lock) spin_lock_irqsave(pll->lock, flags); @@ -1567,7 +1578,12 @@ static int clk_plle_tegra114_enable(struct clk_hw *hw) u32 val; int ret; unsigned long flags = 0; - unsigned long input_rate = clk_hw_get_rate(clk_hw_get_parent(hw)); + unsigned long input_rate; + + if (clk_pll_is_enabled(hw)) + return 0; + + input_rate = clk_hw_get_rate(clk_hw_get_parent(hw)); if (_get_table_rate(hw, &sel, pll->params->fixed_rate, input_rate)) return -EINVAL; @@ -1704,6 +1720,9 @@ static int clk_pllu_tegra114_enable(struct clk_hw *hw) return -EINVAL; } + if (clk_pll_is_enabled(hw)) + return 0; + input_rate = clk_hw_get_rate(__clk_get_hw(osc)); if (pll->lock) @@ -2379,6 +2398,16 @@ struct clk *tegra_clk_register_pllre_tegra210(const char *name, return clk; } +static int clk_plle_tegra210_is_enabled(struct clk_hw *hw) +{ + struct tegra_clk_pll *pll = to_clk_pll(hw); + u32 val; + + val = pll_readl_base(pll); + + return val & PLLE_BASE_ENABLE ? 1 : 0; +} + static int clk_plle_tegra210_enable(struct clk_hw *hw) { struct tegra_clk_pll *pll = to_clk_pll(hw); @@ -2386,7 +2415,12 @@ static int clk_plle_tegra210_enable(struct clk_hw *hw) u32 val; int ret = 0; unsigned long flags = 0; - unsigned long input_rate = clk_hw_get_rate(clk_hw_get_parent(hw)); + unsigned long input_rate; + + if (clk_plle_tegra210_is_enabled(hw)) + return 0; + + input_rate = clk_hw_get_rate(clk_hw_get_parent(hw)); if (_get_table_rate(hw, &sel, pll->params->fixed_rate, input_rate)) return -EINVAL; @@ -2497,16 +2531,6 @@ out: spin_unlock_irqrestore(pll->lock, flags); } -static int clk_plle_tegra210_is_enabled(struct clk_hw *hw) -{ - struct tegra_clk_pll *pll = to_clk_pll(hw); - u32 val; - - val = pll_readl_base(pll); - - return val & PLLE_BASE_ENABLE ? 1 : 0; -} - static const struct clk_ops tegra_clk_plle_tegra210_ops = { .is_enabled = clk_plle_tegra210_is_enabled, .enable = clk_plle_tegra210_enable, |