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authorLinus Torvalds <torvalds@linux-foundation.org>2011-08-01 06:10:16 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-01 06:10:16 -1000
commite10b87d2b5b4574cdf3a5a19b22ca88b91ba7151 (patch)
tree21c0714515e1fb1722b918b5e43ecbd7349e2202 /drivers/sh/clk
parent3da3f872aa175f59e20766ed30aaea67fd4fa7d1 (diff)
parent536628d0983f1c6a7ccece28ded635661aa30319 (diff)
downloadlinux-e10b87d2b5b4574cdf3a5a19b22ca88b91ba7151.tar.gz
Merge branch 'sh-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-3.x
* 'sh-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-3.x: (39 commits) SH: static should be at beginning of declaration sh: move CLKDEV_xxx_ID macro to sh_clk.h sh: clock-shx3: add CLKDEV_ICK_ID for cleanup sh: clock-sh7786: add CLKDEV_ICK_ID for cleanup sh: clock-sh7785: add CLKDEV_ICK_ID for cleanup sh: clock-sh7757: add CLKDEV_ICK_ID for cleanup sh: clock-sh7366: add CLKDEV_ICK_ID for cleanup sh: clock-sh7343: add CLKDEV_ICK_ID for cleanup sh: clock-sh7722: add CLKDEV_ICK_ID for cleanup sh: clock-sh7724: add CLKDEV_ICK_ID for cleanup sh: clock-sh7366: modify I2C clock settings sh: clock-sh7343: modify I2C clock settings sh: clock-sh7723: modify I2C clock settings sh: clock-sh7722: modify I2C clock settings sh: clock-sh7724: modify I2C clock settings serial: sh-sci: Fix up pretty name printing for port IRQs. serial: sh-sci: Kill off per-port enable/disable callbacks. serial: sh-sci: Add missing module description/author bits. serial: sh-sci: Regtype probing doesn't need to be fatal. sh: Tidy up pre-clkdev clk_get() error handling. ...
Diffstat (limited to 'drivers/sh/clk')
-rw-r--r--drivers/sh/clk/core.c29
1 files changed, 27 insertions, 2 deletions
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c
index d6702e57d42..dc8d022c07a 100644
--- a/drivers/sh/clk/core.c
+++ b/drivers/sh/clk/core.c
@@ -34,6 +34,9 @@ static LIST_HEAD(clock_list);
static DEFINE_SPINLOCK(clock_lock);
static DEFINE_MUTEX(clock_list_sem);
+/* clock disable operations are not passed on to hardware during boot */
+static int allow_disable;
+
void clk_rate_table_build(struct clk *clk,
struct cpufreq_frequency_table *freq_table,
int nr_freqs,
@@ -228,7 +231,7 @@ static void __clk_disable(struct clk *clk)
return;
if (!(--clk->usecount)) {
- if (likely(clk->ops && clk->ops->disable))
+ if (likely(allow_disable && clk->ops && clk->ops->disable))
clk->ops->disable(clk);
if (likely(clk->parent))
__clk_disable(clk->parent);
@@ -393,7 +396,7 @@ int clk_register(struct clk *clk)
{
int ret;
- if (clk == NULL || IS_ERR(clk))
+ if (IS_ERR_OR_NULL(clk))
return -EINVAL;
/*
@@ -744,3 +747,25 @@ err_out:
return err;
}
late_initcall(clk_debugfs_init);
+
+static int __init clk_late_init(void)
+{
+ unsigned long flags;
+ struct clk *clk;
+
+ /* disable all clocks with zero use count */
+ mutex_lock(&clock_list_sem);
+ spin_lock_irqsave(&clock_lock, flags);
+
+ list_for_each_entry(clk, &clock_list, node)
+ if (!clk->usecount && clk->ops && clk->ops->disable)
+ clk->ops->disable(clk);
+
+ /* from now on allow clock disable operations */
+ allow_disable = 1;
+
+ spin_unlock_irqrestore(&clock_lock, flags);
+ mutex_unlock(&clock_list_sem);
+ return 0;
+}
+late_initcall(clk_late_init);