diff options
| author | Peter De Schrijver <pdeschrijver@nvidia.com> | 2013-02-07 18:24:14 +0200 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-02-12 10:29:12 -0700 |
| commit | c64c65d494ade53fa41fb0b980381807743b5095 (patch) | |
| tree | 3dcf17880f8487eceac3a5a8d40b745d3d49d9b0 /drivers/clk/tegra/clk-super.c | |
| parent | 22ca335f6db9cf614696bbcb83eb0b80db7b4110 (diff) | |
| download | linux-c64c65d494ade53fa41fb0b980381807743b5095.tar.bz2 | |
clk: tegra: Implement locking for super clock
Although tegra_clk_register_super_mux() has a lock parameter, the lock is not
actually used by the code. Fixed with this patch.
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Reviewed-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/clk/tegra/clk-super.c')
| -rw-r--r-- | drivers/clk/tegra/clk-super.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c index 7ad48a832334..2fd924d38606 100644 --- a/drivers/clk/tegra/clk-super.c +++ b/drivers/clk/tegra/clk-super.c @@ -73,7 +73,12 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index) { struct tegra_clk_super_mux *mux = to_clk_super_mux(hw); u32 val, state; + int err = 0; u8 parent_index, shift; + unsigned long flags = 0; + + if (mux->lock) + spin_lock_irqsave(mux->lock, flags); val = readl_relaxed(mux->reg); state = val & SUPER_STATE_MASK; @@ -92,8 +97,10 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index) (index == mux->pllx_index))) { parent_index = clk_super_get_parent(hw); if ((parent_index == mux->div2_index) || - (parent_index == mux->pllx_index)) - return -EINVAL; + (parent_index == mux->pllx_index)) { + err = -EINVAL; + goto out; + } val ^= SUPER_LP_DIV2_BYPASS; writel_relaxed(val, mux->reg); @@ -107,7 +114,12 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index) writel_relaxed(val, mux->reg); udelay(2); - return 0; + +out: + if (mux->lock) + spin_unlock_irqrestore(mux->lock, flags); + + return err; } const struct clk_ops tegra_clk_super_ops = { |