diff options
author | Magnus Damm <damm@opensource.se> | 2011-06-21 03:55:12 -0400 |
---|---|---|
committer | Paul Mundt <lethal@linux-sh.org> | 2011-06-24 03:27:07 -0400 |
commit | 794d78fea51504bad3880d14f354a9847f318f25 (patch) | |
tree | 8515152063b174deb5af666f2ade0c4b61fec04f /drivers/sh/clk | |
parent | bccaeafd7c117acee36e90d37c7e05c19be9e7bf (diff) |
drivers: sh: late disabling of clocks V2
This V2 patch changes the clock disabling behavior during boot.
Two different changes are made:
1) Delay disabling of clocks until late in the boot process.
This fixes an existing issue where in-use clocks without
software reference are disabled by mistake during boot.
One example of this is the handling of the Mackerel serial
console output that shares clock with the I2C controller.
2) Write out the "disabled" state to the hardware for clocks
that not have been used by the kernel. In other words,
make sure so far unused clocks actually get turned off.
Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/sh/clk')
-rw-r--r-- | drivers/sh/clk/core.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c index 7e9c39951ecb..ebeaa9e9f068 100644 --- a/drivers/sh/clk/core.c +++ b/drivers/sh/clk/core.c | |||
@@ -34,6 +34,9 @@ static LIST_HEAD(clock_list); | |||
34 | static DEFINE_SPINLOCK(clock_lock); | 34 | static DEFINE_SPINLOCK(clock_lock); |
35 | static DEFINE_MUTEX(clock_list_sem); | 35 | static DEFINE_MUTEX(clock_list_sem); |
36 | 36 | ||
37 | /* clock disable operations are not passed on to hardware during boot */ | ||
38 | static int allow_disable; | ||
39 | |||
37 | void clk_rate_table_build(struct clk *clk, | 40 | void clk_rate_table_build(struct clk *clk, |
38 | struct cpufreq_frequency_table *freq_table, | 41 | struct cpufreq_frequency_table *freq_table, |
39 | int nr_freqs, | 42 | int nr_freqs, |
@@ -228,7 +231,7 @@ static void __clk_disable(struct clk *clk) | |||
228 | return; | 231 | return; |
229 | 232 | ||
230 | if (!(--clk->usecount)) { | 233 | if (!(--clk->usecount)) { |
231 | if (likely(clk->ops && clk->ops->disable)) | 234 | if (likely(allow_disable && clk->ops && clk->ops->disable)) |
232 | clk->ops->disable(clk); | 235 | clk->ops->disable(clk); |
233 | if (likely(clk->parent)) | 236 | if (likely(clk->parent)) |
234 | __clk_disable(clk->parent); | 237 | __clk_disable(clk->parent); |
@@ -747,3 +750,25 @@ err_out: | |||
747 | return err; | 750 | return err; |
748 | } | 751 | } |
749 | late_initcall(clk_debugfs_init); | 752 | late_initcall(clk_debugfs_init); |
753 | |||
754 | static int __init clk_late_init(void) | ||
755 | { | ||
756 | unsigned long flags; | ||
757 | struct clk *clk; | ||
758 | |||
759 | /* disable all clocks with zero use count */ | ||
760 | mutex_lock(&clock_list_sem); | ||
761 | spin_lock_irqsave(&clock_lock, flags); | ||
762 | |||
763 | list_for_each_entry(clk, &clock_list, node) | ||
764 | if (!clk->usecount && clk->ops && clk->ops->disable) | ||
765 | clk->ops->disable(clk); | ||
766 | |||
767 | /* from now on allow clock disable operations */ | ||
768 | allow_disable = 1; | ||
769 | |||
770 | spin_unlock_irqrestore(&clock_lock, flags); | ||
771 | mutex_unlock(&clock_list_sem); | ||
772 | return 0; | ||
773 | } | ||
774 | late_initcall(clk_late_init); | ||