forked from luck/tmp_suning_uos_patched
OMAP: clock: bail out early if arch_clock functions not implemented
Bail out before we take the clockfw_lock spinlock if the corresponding OMAP1 or OMAP2+ clock function is not defined. The intention is to reduce and simplify the work that is done inside the spinlock. Signed-off-by: Paul Walmsley <paul@pwsan.com>
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parent
19c1c0ce9d
commit
e07f469d28
@ -37,14 +37,16 @@ static struct clk_functions *arch_clock;
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int clk_enable(struct clk *clk)
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{
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unsigned long flags;
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int ret = 0;
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int ret;
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if (clk == NULL || IS_ERR(clk))
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return -EINVAL;
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if (!arch_clock || !arch_clock->clk_enable)
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return -EINVAL;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (arch_clock->clk_enable)
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ret = arch_clock->clk_enable(clk);
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ret = arch_clock->clk_enable(clk);
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spin_unlock_irqrestore(&clockfw_lock, flags);
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return ret;
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@ -58,6 +60,9 @@ void clk_disable(struct clk *clk)
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if (clk == NULL || IS_ERR(clk))
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return;
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if (!arch_clock || !arch_clock->clk_disable)
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return;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (clk->usecount == 0) {
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pr_err("Trying disable clock %s with 0 usecount\n",
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@ -66,8 +71,7 @@ void clk_disable(struct clk *clk)
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goto out;
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}
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if (arch_clock->clk_disable)
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arch_clock->clk_disable(clk);
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arch_clock->clk_disable(clk);
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out:
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spin_unlock_irqrestore(&clockfw_lock, flags);
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@ -77,7 +81,7 @@ EXPORT_SYMBOL(clk_disable);
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unsigned long clk_get_rate(struct clk *clk)
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{
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unsigned long flags;
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unsigned long ret = 0;
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unsigned long ret;
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if (clk == NULL || IS_ERR(clk))
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return 0;
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@ -97,14 +101,16 @@ EXPORT_SYMBOL(clk_get_rate);
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long clk_round_rate(struct clk *clk, unsigned long rate)
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{
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unsigned long flags;
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long ret = 0;
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long ret;
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if (clk == NULL || IS_ERR(clk))
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return ret;
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return 0;
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if (!arch_clock || !arch_clock->clk_round_rate)
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return 0;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (arch_clock->clk_round_rate)
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ret = arch_clock->clk_round_rate(clk, rate);
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ret = arch_clock->clk_round_rate(clk, rate);
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spin_unlock_irqrestore(&clockfw_lock, flags);
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return ret;
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@ -119,14 +125,13 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
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if (clk == NULL || IS_ERR(clk))
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return ret;
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if (!arch_clock || !arch_clock->clk_set_rate)
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return ret;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (arch_clock->clk_set_rate)
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ret = arch_clock->clk_set_rate(clk, rate);
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if (ret == 0) {
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if (clk->recalc)
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clk->rate = clk->recalc(clk);
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ret = arch_clock->clk_set_rate(clk, rate);
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if (ret == 0)
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propagate_rate(clk);
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}
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spin_unlock_irqrestore(&clockfw_lock, flags);
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return ret;
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@ -141,15 +146,14 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
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if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
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return ret;
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if (!arch_clock || !arch_clock->clk_set_parent)
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return ret;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (clk->usecount == 0) {
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if (arch_clock->clk_set_parent)
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ret = arch_clock->clk_set_parent(clk, parent);
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if (ret == 0) {
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if (clk->recalc)
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clk->rate = clk->recalc(clk);
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ret = arch_clock->clk_set_parent(clk, parent);
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if (ret == 0)
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propagate_rate(clk);
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}
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} else
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ret = -EBUSY;
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spin_unlock_irqrestore(&clockfw_lock, flags);
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@ -399,9 +403,11 @@ void clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
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{
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unsigned long flags;
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if (!arch_clock || !arch_clock->clk_init_cpufreq_table)
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return;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (arch_clock->clk_init_cpufreq_table)
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arch_clock->clk_init_cpufreq_table(table);
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arch_clock->clk_init_cpufreq_table(table);
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spin_unlock_irqrestore(&clockfw_lock, flags);
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}
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@ -409,9 +415,11 @@ void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
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{
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unsigned long flags;
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if (!arch_clock || !arch_clock->clk_exit_cpufreq_table)
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return;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (arch_clock->clk_exit_cpufreq_table)
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arch_clock->clk_exit_cpufreq_table(table);
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arch_clock->clk_exit_cpufreq_table(table);
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spin_unlock_irqrestore(&clockfw_lock, flags);
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}
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#endif
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@ -429,6 +437,9 @@ static int __init clk_disable_unused(void)
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struct clk *ck;
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unsigned long flags;
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if (!arch_clock || !arch_clock->clk_disable_unused)
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return 0;
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pr_info("clock: disabling unused clocks to save power\n");
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list_for_each_entry(ck, &clocks, node) {
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if (ck->ops == &clkops_null)
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@ -438,8 +449,7 @@ static int __init clk_disable_unused(void)
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continue;
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spin_lock_irqsave(&clockfw_lock, flags);
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if (arch_clock->clk_disable_unused)
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arch_clock->clk_disable_unused(ck);
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arch_clock->clk_disable_unused(ck);
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spin_unlock_irqrestore(&clockfw_lock, flags);
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}
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