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Commit e07f469d authored by Paul Walmsley's avatar Paul Walmsley
Browse files

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: default avatarPaul Walmsley <paul@pwsan.com>
parent 19c1c0ce

arch/arm/plat-omap/clock.c

+38 −28
Original line number Diff line number Diff line
@@ -37,13 +37,15 @@ static struct clk_functions *arch_clock; 
int clk_enable(struct clk *clk)

{

	unsigned long flags;

	int ret = 0;

	int ret;



	if (clk == NULL || IS_ERR(clk))

		return -EINVAL;



	if (!arch_clock || !arch_clock->clk_enable)

		return -EINVAL;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (arch_clock->clk_enable)

	ret = arch_clock->clk_enable(clk);

	spin_unlock_irqrestore(&clockfw_lock, flags);
@@ -58,6 +60,9 @@ void clk_disable(struct clk *clk) 
	if (clk == NULL || IS_ERR(clk))

		return;



	if (!arch_clock || !arch_clock->clk_disable)

		return;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (clk->usecount == 0) {

		pr_err("Trying disable clock %s with 0 usecount\n",
@@ -66,7 +71,6 @@ void clk_disable(struct clk *clk) 
		goto out;

	}



	if (arch_clock->clk_disable)

	arch_clock->clk_disable(clk);



out:
@@ -77,7 +81,7 @@ EXPORT_SYMBOL(clk_disable); 
unsigned long clk_get_rate(struct clk *clk)

{

	unsigned long flags;

	unsigned long ret = 0;

	unsigned long ret;



	if (clk == NULL || IS_ERR(clk))

		return 0;
@@ -97,13 +101,15 @@ EXPORT_SYMBOL(clk_get_rate); 
long clk_round_rate(struct clk *clk, unsigned long rate)

{

	unsigned long flags;

	long ret = 0;

	long ret;



	if (clk == NULL || IS_ERR(clk))

		return ret;

		return 0;



	if (!arch_clock || !arch_clock->clk_round_rate)

		return 0;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (arch_clock->clk_round_rate)

	ret = arch_clock->clk_round_rate(clk, rate);

	spin_unlock_irqrestore(&clockfw_lock, flags);
@@ -119,14 +125,13 @@ int clk_set_rate(struct clk *clk, unsigned long rate) 
	if (clk == NULL || IS_ERR(clk))

		return ret;



	if (!arch_clock || !arch_clock->clk_set_rate)

		return ret;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (arch_clock->clk_set_rate)

	ret = arch_clock->clk_set_rate(clk, rate);

	if (ret == 0) {

		if (clk->recalc)

			clk->rate = clk->recalc(clk);

	if (ret == 0)

		propagate_rate(clk);

	}

	spin_unlock_irqrestore(&clockfw_lock, flags);



	return ret;
@@ -141,15 +146,14 @@ int clk_set_parent(struct clk *clk, struct clk *parent) 
	if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))

		return ret;



	if (!arch_clock || !arch_clock->clk_set_parent)

		return ret;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (clk->usecount == 0) {

		if (arch_clock->clk_set_parent)

		ret = arch_clock->clk_set_parent(clk, parent);

		if (ret == 0) {

			if (clk->recalc)

				clk->rate = clk->recalc(clk);

		if (ret == 0)

			propagate_rate(clk);

		}

	} else

		ret = -EBUSY;

	spin_unlock_irqrestore(&clockfw_lock, flags);
@@ -399,8 +403,10 @@ void clk_init_cpufreq_table(struct cpufreq_frequency_table **table) 
{

	unsigned long flags;



	if (!arch_clock || !arch_clock->clk_init_cpufreq_table)

		return;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (arch_clock->clk_init_cpufreq_table)

	arch_clock->clk_init_cpufreq_table(table);

	spin_unlock_irqrestore(&clockfw_lock, flags);

}
@@ -409,8 +415,10 @@ void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table) 
{

	unsigned long flags;



	if (!arch_clock || !arch_clock->clk_exit_cpufreq_table)

		return;



	spin_lock_irqsave(&clockfw_lock, flags);

	if (arch_clock->clk_exit_cpufreq_table)

	arch_clock->clk_exit_cpufreq_table(table);

	spin_unlock_irqrestore(&clockfw_lock, flags);

}
@@ -429,6 +437,9 @@ static int __init clk_disable_unused(void) 
	struct clk *ck;

	unsigned long flags;



	if (!arch_clock || !arch_clock->clk_disable_unused)

		return 0;



	pr_info("clock: disabling unused clocks to save power\n");

	list_for_each_entry(ck, &clocks, node) {

		if (ck->ops == &clkops_null)
@@ -438,7 +449,6 @@ static int __init clk_disable_unused(void) 
			continue;



		spin_lock_irqsave(&clockfw_lock, flags);

		if (arch_clock->clk_disable_unused)

		arch_clock->clk_disable_unused(ck);

		spin_unlock_irqrestore(&clockfw_lock, flags);

	}